:root {
    /* Primary Blues */
    --primary-50: #EBF2FB;
    --primary-100: #D1E2F6;
    --primary-200: #A3C5ED;
    --primary-300: #75A8E4;
    --primary-400: #4F90DB;
    --primary-500: #3B7DD8;   
    --primary-600: #2E65B0;
    --primary-700: #224D88;
    --primary-800: #173560;
    --primary-900: #0C1D38;

    /* Neutrals */
    --neutral-50: #F8FAFD;
    --neutral-100: #F0F4F8;
    --neutral-200: #E1E8F0;
    --neutral-300: #C8D3E0;
    --neutral-400: #94A3B8;
    --neutral-500: #64748B;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1E293B;
    --neutral-900: #0F172A;

    /* Colors Code */
    --keyword: #C678DD;
    --class: #E5C07B;
    --string: #98C379;
    --method: #61AFEF;

    /*error*/
    --error: #E24B4A;

    /*success*/
    --success: #1D9E75;

    /*Background success and error*/
    --background-success: #0F6E56;
    --background-error: #A32D2D;

    /* Accents */
    --accent-teal: #0EA5E9;
    --accent-green: #22C55E;
    --accent-amber: #F59E0B;

    /* Semantic */
    --bg-primary: #FAFCFF;
    --bg-secondary: #F0F5FB;
    --bg-dark: #0C1D38;
    --bg-card: #FFFFFF;

    --text-primary: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --text-on-dark: #E2E8F0;
    --text-on-primary: #FFFFFF;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #3B7DD8 0%, #2E65B0 50%, #173560 100%);
    --gradient-hero: linear-gradient(135deg, #0C1D38 0%, #173560 40%, #224D88 100%);
    --gradient-accent: linear-gradient(135deg, #3B7DD8 0%, #0EA5E9 100%);
    --gradient-card: linear-gradient(135deg, rgba(59,125,216,0.05) 0%, rgba(14,165,233,0.05) 100%);

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
    --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 6px rgba(15, 23, 42, 0.04);
    --shadow-lg: 0 12px 40px rgba(15, 23, 42, 0.12), 0 4px 12px rgba(15, 23, 42, 0.06);
    --shadow-xl: 0 20px 60px rgba(15, 23, 42, 0.15), 0 8px 24px rgba(15, 23, 42, 0.08);
    --shadow-glow: 0 0 40px rgba(59, 125, 216, 0.2);
    --shadow-glow-lg: 0 0 80px rgba(59, 125, 216, 0.3);

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* Spacing */
    --section-padding: 120px;
    --container-max: 1200px;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* Border radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Scrollbar */
    --scrollbar-bg: #E1E8F0;
    --scrollbar-thumb: #94A3B8;

    /* Navbar scrolled (light) */
    --navbar-scrolled-bg: rgba(255, 255, 255, 0.92);
    --navbar-scrolled-border: var(--neutral-200);
}

/* === DARK MODE === */
[data-theme="dark"] {
    --primary-50: #0D1B2A;
    --primary-100: #132B42;
    --primary-200: #1A3A5C;
    --primary-300: #2A5FA8;
    --primary-400: #4F90DB;
    --primary-500: #5A9BE6;
    --primary-600: #75A8E4;
    --primary-700: #A3C5ED;
    --primary-800: #D1E2F6;
    --primary-900: #EBF2FB;

    --neutral-50: #0B1120;
    --neutral-100: #111827;
    --neutral-200: #1E293B;
    --neutral-300: #334155;
    --neutral-400: #64748B;
    --neutral-500: #94A3B8;
    --neutral-600: #CBD5E1;
    --neutral-700: #E2E8F0;
    --neutral-800: #F1F5F9;
    --neutral-900: #F8FAFC;

    --bg-primary: #0B1120;
    --bg-secondary: #111827;
    --bg-dark: #060D19;
    --bg-card: #151F32;

    --text-primary: #F1F5F9;
    --text-secondary: #94A3B8;
    --text-muted: #64748B;
    --text-on-dark: #E2E8F0;
    --text-on-primary: #FFFFFF;

    --gradient-primary: linear-gradient(135deg, #4F90DB 0%, #3B7DD8 50%, #2E65B0 100%);
    --gradient-hero: linear-gradient(135deg, #060D19 0%, #0C1D38 40%, #173560 100%);
    --gradient-accent: linear-gradient(135deg, #4F90DB 0%, #0EA5E9 100%);
    --gradient-card: linear-gradient(135deg, rgba(59,125,216,0.08) 0%, rgba(14,165,233,0.08) 100%);

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.15);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25), 0 2px 6px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.3), 0 4px 12px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 60px rgba(0, 0, 0, 0.35), 0 8px 24px rgba(0, 0, 0, 0.25);
    --shadow-glow: 0 0 40px rgba(79, 144, 219, 0.25);
    --shadow-glow-lg: 0 0 80px rgba(79, 144, 219, 0.35);

    --scrollbar-bg: #1E293B;
    --scrollbar-thumb: #334155;

    --navbar-scrolled-bg: rgba(11, 17, 32, 0.92);
    --navbar-scrolled-border: rgba(30, 41, 59, 0.8);
}



/* === Reset & Base === */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* === Container === */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* === Section Shared Styles === */
.section {
    padding: var(--section-padding) 0;
    position: relative;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--primary-500);
    letter-spacing: 0.05em;
    margin-bottom: 16px;
}

[data-theme="dark"] .section-tag {
    color: var(--primary-900);
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.75rem);
    font-weight: 800;
    color: var(--neutral-900);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}


.section-line {
    width: 60px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    margin: 0 auto;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: var(--radius-full);
    font-family: var(--font-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.15), transparent);
    transition: left 0.5s ease;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--text-on-primary);
    box-shadow: 0 4px 20px rgba(59, 125, 216, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px rgba(59, 125, 216, 0.4);
}

.btn-secondary {
    background: transparent;
    color: var(--primary-100);
    border: 2px solid var(--primary-200);
}

[data-theme="dark"] .btn-secondary {
    color: var(--primary-900);
}


.btn-secondary:hover {
    color: var(--primary-500);
    background: var(--primary-50);
    border-color: var(--primary-500);
    transform: translateY(-2px);
}

.btn-lg {
    padding: 18px 40px;
    font-size: 1.0625rem;
}

/* ============================================
   NAVBAR
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 20px 0;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: var(--navbar-scrolled-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--navbar-scrolled-border);
    padding: 12px 0;
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-family: var(--font-mono);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-on-primary);
    transition: color var(--transition-base);
}

.navbar.scrolled .nav-logo {
    color: var(--primary-500);
}

.logo-bracket {
    color: var(--primary-300);
}

.navbar.scrolled .logo-bracket {
    color: var(--primary-400);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-link {
    padding: 8px 16px;
    font-size: 0.875rem;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.navbar.scrolled .nav-link {
    color: var(--text-secondary);
}

.nav-link:hover {
    color: var(--text-on-primary);
    background: rgba(255, 255, 255, 0.1);
}

.navbar.scrolled .nav-link:hover {
    color: var(--primary-500);
    background: var(--primary-50);
}

.nav-link-cta {
    background: rgba(255, 255, 255, 0.15);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--text-on-primary) !important;
}

.navbar.scrolled .nav-link-cta {
    background: var(--primary-500) !important;
    border-color: var(--primary-500) !important;
    color: var(--text-on-primary) !important;
}

.nav-link-cta:hover {
    background: rgba(255, 255, 255, 0.25) !important;
}

.navbar.scrolled .nav-link-cta:hover {
    background: var(--primary-600) !important;
}

/* Mobile toggle */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-on-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.navbar.scrolled .nav-toggle span {
    background: var(--neutral-700);
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-base);
    color: var(--primary-100);
    overflow: hidden;
    flex-shrink: 0;
}

[data-theme="dark"] .theme-toggle {
    color: var(--primary-900);
}

[data-theme="dark"] .theme-toggle:hover {
    color: var(--neutral-900);
}

.navbar.scrolled .theme-toggle {
    background: var(--bg-secondary);
    border-color: var(--neutral-200);
    color: var(--text-secondary);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: rgba(255, 255, 255, 0.3);
    transform: scale(1.08);
    color: var(--neutral-50);
}

.navbar.scrolled .theme-toggle:hover {
    background: var(--primary-50);
    border-color: var(--primary-200);
    color: var(--primary-500);
}

.theme-toggle .icon-sun,
.theme-toggle .icon-moon {
    position: absolute;
    transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.theme-toggle .icon-sun {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

.theme-toggle .icon-moon {
    opacity: 0;
    transform: scale(0.5) rotate(-90deg);
}

[data-theme="dark"] .theme-toggle .icon-sun {
    opacity: 0;
    transform: scale(0.5) rotate(90deg);
}

[data-theme="dark"] .theme-toggle .icon-moon {
    opacity: 1;
    transform: scale(1) rotate(0deg);
}

/* Dark mode: scrolled navbar keeps dark styling */
[data-theme="dark"] .navbar.scrolled .nav-link {
    color: var(--neutral-400);
}

[data-theme="dark"] .navbar.scrolled .nav-link:hover {
    color: var(--primary-400);
    background: rgba(79, 144, 219, 0.1);
}

[data-theme="dark"] .navbar.scrolled .nav-logo {
    color: var(--primary-400);
}

[data-theme="dark"] .navbar.scrolled .nav-toggle span {
    background: var(--neutral-400);
}

/* Dark mode body transition */
body {
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* Custom scrollbar for dark mode */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--scrollbar-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--scrollbar-thumb);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-500);
}

/* ============================================
   HERO
   ============================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
    padding: 120px 24px 80px;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background: 
        radial-gradient(ellipse 800px 600px at 20% 50%, rgba(59, 125, 216, 0.15) 0%, transparent 70%),
        radial-gradient(ellipse 600px 400px at 80% 30%, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
}

.hero-particles {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles .particle {
    position: absolute;
    width: 3px;
    height: 3px;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 50%;
    animation: float-particle linear infinite;
}

@keyframes float-particle {
    0% {
        transform: translateY(100vh) rotate(0deg);
        opacity: 0;
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 1;
    }
    100% {
        transform: translateY(-10vh) rotate(720deg);
        opacity: 0;
    }
}

.hero-content {
    max-width: 800px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 20px;
    background: rgba(59, 125, 216, 0.15);
    border: 1px solid rgba(59, 125, 216, 0.3);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--primary-100);
    margin-bottom: 32px;
    animation: fadeInUp 0.8s ease both;
}

[data-theme="dark"]  .hero-badge {
    color: var(--primary-900);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--accent-green);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.3); }
}

.hero-title {
    margin-bottom: 24px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-greeting {
    display: block;
    font-size: clamp(1rem, 2vw, 1.25rem);
    font-weight: 500;
    color: var(--primary-100);
    margin-bottom: 8px;
    letter-spacing: 0.05em;
}

[data-theme="dark"] .hero-greeting {
    color: var(--primary-900);

}

.hero-name {
    display: block;
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 900;
    color: var(--text-on-primary);
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 12px;
    background: linear-gradient(135deg, #FFFFFF 0%, #D1E2F6 50%, #A3C5ED 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-role {
    display: block;
    font-size: clamp(1.125rem, 2.5vw, 1.5rem);
    font-weight: 600;
    color: var(--primary-200);
    font-family: var(--font-mono);
    min-height: 1.5em;
}

[data-theme="dark"] .hero-role {
    color: var(--primary-900);
}

.cursor {
    animation: blink 1s step-end infinite;
    color: var(--primary-400);
}

@keyframes blink {
    50% { opacity: 0; }
}


.hero-description {
    font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
    color: var(--neutral-400);
    max-width: 600px;
    margin: 0 auto 40px;
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-description strong {
    color: var(--primary-200);
}

[data-theme="dark"] .hero-description {
    color: var(--neutral-600);
}

 [data-theme="dark"] .hero-description strong {
    color: var(--primary-600);
}

.hero-actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 16px;
    margin-bottom: 64px;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    animation: fadeInUp 0.8s ease 0.8s both;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--text-on-primary);
    line-height: 1;
}

.stat-suffix {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-300);
}

.stat-label {
    display: block;
    font-size: 0.8125rem;
    color: var(--neutral-400);
    margin-top: 8px;
}

[data-theme="dark"] .stat-label {
    color: var(--neutral-900);
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
}

.hero-scroll {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 2;
    animation: fadeInUp 0.8s ease 1s both;
}

.scroll-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: var(--neutral-400);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scroll-line {
    width: 1px;
    height: 40px;
    background: linear-gradient(to bottom, var(--primary-400), transparent);
    animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: scaleY(0.6); transform-origin: top; }
    50% { transform: scaleY(1); transform-origin: top; }
}

/* ============================================
   ABOUT
   ============================================ */
.about {
    background: var(--bg-primary);
}

.about-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 64px;
    align-items: center;
}

.about-text p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 20px;
    line-height: 1.8;
}

.about-text strong {
    color: var(--primary-600);
    font-weight: 600;
}

.about-details {
    margin-top: 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.detail-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 20px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    font-size: 0.9375rem;
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.detail-item:hover {
    background: var(--primary-50);
    transform: translateX(8px);
}

.detail-item svg {
    color: var(--primary-500);
    flex-shrink: 0;
}

/* Code Window */
.about-image {
    position: relative;
}

.image-frame {
    position: relative;
}

.image-frame::before {
    content: '';
    position: absolute;
    top: -8px;
    right: -8px;
    width: 100%;
    height: 100%;
    border: 2px solid var(--primary-200);
    border-radius: var(--radius-lg);
    opacity: 0.5;
}

.code-window {
    background: var(--neutral-100);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 1;
}

.window-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 14px 20px;
    background: var(--neutral-400);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

[data-theme="dark"] .window-header {
    background: var(--neutral-100);
}

.window-dots {
    display: flex;
    gap: 7px;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
}

.dot.red { background: #FF5F57; }
.dot.yellow { background: #FFBD2E; }
.dot.green { background: #28CA42; }

.window-title {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--neutral-100);
}

[data-theme="dark"] .window-title {
    color: var(--neutral-900);
}

.window-body {
    padding: 24px;
}

.window-body pre {
    font-family: var(--font-mono);
    font-size: 0.85rem;
    line-height: 1.8;
    color: var(--neutral-300);
}

[data-theme="dark"] .window-body {
    background: var(--neutral-50);
}

.code-keyword {color: var(--keyword);}
.code-class {color: var(--class);}
.code-string {color: var(--string);}
.code-method {color: var(--method);}
.code-name-class {color: var(--neutral-800);}

/* ============================================
   EXPERIENCE
   ============================================ */
.experience {
    background: var(--bg-secondary);
}

.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 24px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(to bottom, var(--primary-500), var(--primary-200), transparent);
}

.timeline-item {
    position: relative;
    padding-left: 72px;
    padding-bottom: 40px;
}

.timeline-marker {
    position: absolute;
    left: 14px;
    top: 8px;
}

.marker-dot {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    background: var(--bg-secondary);
    border: 3px solid var(--primary-500);
    position: relative;
    z-index: 1;
}

.marker-dot::before {
    content: '';
    position: absolute;
    inset: 4px;
    background: var(--primary-500);
    border-radius: 50%;
}

.timeline-content {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border: 1px solid var(--neutral-200);
}

.timeline-content:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 12px;
}

.timeline-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
}

.timeline-company {
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary-500);
}

.timeline-date {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    color: var(--text-muted);
    background: var(--primary-50);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    white-space: nowrap;
}

.timeline-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 24px;
}

.timeline-list li {
    display: flex;
    gap: 14px;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

.achievement-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.highlight {
    color: var(--primary-600);
    font-weight: 600;
}

.timeline-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tag {
    padding: 6px 14px;
    background: var(--primary-50);
    color: var(--primary-600);
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.tag:hover {
    background: var(--primary-100);
    transform: translateY(-1px);
}

/* ============================================
   PROJECTS
   ============================================ */
.projects {
    background: var(--bg-primary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.project-card {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-slow);
}

.project-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-lg);
    padding: 2px;
    background: linear-gradient(135deg, var(--primary-200), transparent, var(--primary-100));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover::before {
    opacity: 1;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.project-card-inner {
    height: 100%;
    background: var(--bg-card);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    display: flex;
    flex-direction: column;
    transition: all var(--transition-base);
}

.project-card:hover .project-card-inner {
    border-color: transparent;
}

.project-icon-area {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
}

.project-icon {
    width: 64px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border: 1px solid var(--primary-100);
    border-radius: var(--radius-md);
    color: var(--primary-500);
    transition: all var(--transition-base);
}

.project-card:hover .project-icon {
    background: var(--gradient-accent);
    color: var(--text-on-primary);
    border-color: transparent;
    transform: scale(1.05);
}

.project-badge {
    font-family: var(--font-mono);
    font-size: 0.6875rem;
    font-weight: 600;
    color: var(--primary-500);
    background: var(--primary-50);
    padding: 4px 12px;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.project-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.project-description {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
    flex-grow: 1;
}

.project-impact {
    padding: 16px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    margin-bottom: 20px;
}

.impact-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.impact-value {
    font-size: 1.25rem;
    font-weight: 800;
    color: var(--primary-500);
}

.impact-label {
    font-size: 0.8125rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.project-tech span {
    font-family: var(--font-mono);
    font-size: 0.75rem;
    color: var(--primary-600);
    background: var(--primary-50);
    padding: 4px 12px;
    border-radius: var(--radius-full);
}

/* ============================================
   SKILLS
   ============================================ */
.skills {
    background: var(--bg-secondary);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}

.skill-category {
    background: var(--bg-card);
    padding: 32px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.skill-category:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.skill-category-header {
    display: flex;
    align-items: center;
    gap: 16px;
    margin-bottom: 28px;
}

.skill-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-card);
    border: 1px solid var(--primary-100);
    border-radius: var(--radius-md);
    color: var(--primary-500);
}

.skill-category-header h3 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-primary);
}

.skill-items {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.skill-item {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.skill-info {
    display: flex;
    justify-content: space-between;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.skill-level {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 400;
}

.skill-bar {
    height: 8px;
    background: var(--neutral-100);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    width: 0;
    transition: width 1.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
}

.skill-fill::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    animation: shimmer 2s infinite;
}

@keyframes shimmer {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

/* ============================================
   EDUCATION
   ============================================ */
.education {
    background: var(--bg-primary);
}

.education-card {
    max-width: 700px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 32px;
    padding: 40px;
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    border: 1px solid var(--neutral-200);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.education-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.edu-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-accent);
    border-radius: var(--radius-lg);
    color: var(--text-on-primary);
    flex-shrink: 0;
}

.edu-content h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 8px;
}

.edu-school {
    font-size: 1rem;
    font-weight: 500;
    color: var(--primary-500);
    margin-bottom: 4px;
}

.edu-location {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.edu-year {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary-600);
    background: var(--primary-50);
    padding: 6px 16px;
    border-radius: var(--radius-full);
}

/* ============================================
   CONTACT
   ============================================ */
.contact {
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}

.contact::before {
    content: '';
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 600px 400px at 30% 70%, rgba(59, 125, 216, 0.1) 0%, transparent 70%),
        radial-gradient(ellipse 400px 300px at 70% 30%, rgba(14, 165, 233, 0.08) 0%, transparent 70%);
}

.contact .section-tag {
    color: var(--primary-100);
}

[data-theme="dark"] .contact .section-tag {
    color: var(--primary-900);
}

.contact .section-title {
    color: var(--text-on-primary);
}

.contact .section-line {
    background: var(--gradient-accent);
}

[data-theme="dark"] .contact .section-line {
    background: var(--gradient-accent);
}
.contact-content {
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.contact-text {
    font-size: 1.125rem;
    color: var(--neutral-400);
    margin-bottom: 48px;
    line-height: 1.8;
}

[data-theme="dark"] .contact-text {
    color: var(--neutral-900);
}

.contact-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    margin-bottom: 48px;
}

.contact-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
    padding: 28px 20px;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

.contact-card:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary-500);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

.contact-card-icon {
    color: var(--primary-400);
    transition: all var(--transition-base);
}

.contact-card:hover .contact-card-icon {
    color: var(--primary-300);
    transform: scale(1.1);
}

.contact-card-info {
    text-align: center;
}

.contact-card-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--neutral-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}

.contact-card-value {
    font-size: 0.875rem;
    color: var(--text-on-dark);
    font-weight: 500;
}

.contact-form-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: var(--radius-xl);
    padding: 40px;
    margin-bottom: 24px;
}
 
.contact-form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
 
.contact-form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 16px;
}
 
.contact-form-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--neutral-400);
    text-transform: uppercase;
    letter-spacing: 0.08em;
}
 
.contact-form-input,
.contact-form-textarea,
.contact-form-select {
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    padding: 13px 16px;
    color: var(--text-on-dark);
    font-size: 0.9375rem;
    font-family: var(--font-primary);
    transition: all var(--transition-base);
    outline: none;
    width: 100%;
}
 
.contact-form-input:focus,
.contact-form-textarea:focus,
.contact-form-select:focus {
    border-color: var(--primary-500);
    background: rgba(59, 125, 216, 0.08);
    box-shadow: 0 0 0 3px rgba(59, 125, 216, 0.15);
}
 
.contact-form-input::placeholder,
.contact-form-textarea::placeholder {
    color: var(--neutral-600);
}
 
.contact-form-textarea {
    resize: vertical;
    min-height: 120px;
}
 
.contact-form-select {
    appearance: none;
    cursor: pointer;
}
 
.contact-form-select option {
    background: var(--bg-card);
    color: var(--text-primary);
}
 
.contact-form-char {
    font-size: 0.75rem;
    color: var(--neutral-600);
    text-align: right;
    margin-top: 4px;
}
 
.contact-form-footer {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-top: 24px;
    flex-wrap: wrap;
    gap: 12px;
}
 
.contact-form-note {
    font-size: 0.8rem;
    color: var(--neutral-500);
    display: flex;
    align-items: center;
    gap: 6px;
}
 
.contact-form-note-dot {
    width: 7px;
    height: 7px;
    border-radius: var(--radius-full);
    background: var(--accent-green);
    flex-shrink: 0;
}
 
/* Divider */
.contact-divider {
    display: flex;
    align-items: center;
    gap: 16px;
    margin: 8px 0 24px;
}
 
.contact-divider-line {
    flex: 1;
    height: 1px;
    background: rgba(255, 255, 255, 0.06);
}
 
.contact-divider-text {
    font-size: 0.75rem;
    color: var(--neutral-600);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    white-space: nowrap;
}

.input-error {
    border-color: var(--error); !important;
    background: rgba(226, 75, 74, 0.06) !important;
}
 
.input-error:focus {
    box-shadow: 0 0 0 3px rgba(226, 75, 74, 0.15) !important;
}
 
.contact-form-error {
    font-size: 0.78rem;
    color: var(--error);
    margin-top: 4px;
    display: flex;
    align-items: center;
    gap: 4px;
}
 
.contact-form-error::before {
    font-size: 0.7rem;
}
 
/* Botón deshabilitado mientras envía */
#contact-submit:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}
 
/* ── Toast ─────────────────────────────────── */
.contact-toast {
    position: fixed;
    bottom: 32px;
    right: 32px;
    padding: 16px 24px;
    border-radius: var(--radius-md);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--neutral-50);
    z-index: 9999;
    opacity: 0;
    transform: translateY(12px);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    max-width: 360px;
    box-shadow: var(--shadow-lg);
}

[data-theme="dark"] .contact-toast {
    color: var(--neutral-900);
}
 
.contact-toast--visible {
    opacity: 1;
    transform: translateY(0);
}
 
.contact-toast--success {
    background: var(--background-success);
    border: 1px solid var(--success);
}
 
.contact-toast--error {
    background: var(--background-error);
    border: 1px solid var(--error);
}

/* ============================================
   Section Description (shared)
   ============================================ */
.section-description {
    text-align: center;
    max-width: 760px;
    margin: -32px auto 64px;
    font-size: 1.0625rem;
    line-height: 1.7;
    color: var(--text-secondary);
}

[data-theme="dark"] .section-description {
    color: var(--text-secondary);
}

/* ============================================
   Features Grid — Caso de Estudio Facturación
   ============================================ */
.features {
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 64px;
    margin-top: 24px;
}

.feature-card {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 48px;
    background: var(--bg-primary);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    padding: 32px;
    transition: transform var(--transition-base), box-shadow var(--transition-base), border-color var(--transition-base);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: inherit;
    padding: 1px;
    background: var(--gradient-accent);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
            mask-composite: exclude;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.feature-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-card:hover::before {
    opacity: 1;
}

[data-theme="dark"] .feature-card {
    background: var(--bg-primary);
    border-color: var(--neutral-200);
}

/* Reverse layout: imagen a la derecha, contenido a la izquierda */
.feature-card.reverse .feature-image {
    order: 2;
}

.feature-card.reverse .feature-content {
    order: 1;
}

/* Image container */
.feature-image {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    aspect-ratio: 16 / 10;
    background: var(--neutral-100);
    box-shadow: var(--shadow-md);
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 600ms cubic-bezier(0.16, 1, 0.3, 1);
}

.feature-card:hover .feature-image img {
    transform: scale(1.05);
}

[data-theme="dark"] .feature-image {
    background: var(--neutral-200);
}

/* Content */
.feature-content {
    padding: 8px 0;
}

.feature-content h3 {
    font-size: clamp(1.25rem, 2.2vw, 1.5rem);
    font-weight: 700;
    color: var(--neutral-900);
    margin-bottom: 16px;
    line-height: 1.3;
    letter-spacing: -0.01em;
    position: relative;
    padding-left: 16px;
}

.feature-content h3::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    bottom: 8px;
    width: 4px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
}

[data-theme="dark"] .feature-content h3 {
    color: var(--text-secondary);
}

.feature-content p {
    font-size: 1rem;
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

[data-theme="dark"] .feature-content p {
    color: var(--text-secondary);
}

/* Bullets list with custom check icon */
.feature-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.feature-content ul li {
    position: relative;
    padding-left: 28px;
    font-size: 0.9375rem;
    line-height: 1.5;
    color: var(--text-secondary);
}

.feature-content ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 4px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--gradient-accent);
    display: flex;
    align-items: center;
    justify-content: center;
}

.feature-content ul li::after {
    content: '';
    position: absolute;
    color: var(--text-secondary);
    left: 5px;
    top: 9px;
    width: 8px;
    height: 4px;
    border-left: 2px solid var(--bg-primary);
    border-bottom: 2px solid var(--bg-primary);
    transform: rotate(-45deg);
}

[data-theme="dark"] .feature-content ul li {
    color: var(--text-secondary);
}

/* Cursor */
.feature-image img {
    cursor: zoom-in;
}

/* Modal */
.image-modal {
    display: none;
    position: fixed;
    z-index: 9999;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    justify-content: center;
    align-items: center;
    padding: 2rem;
    animation: fadeIn 0.25s ease;
}

.image-modal.show {
    display: flex;
}

.modal-content {
    max-width: 95%;
    max-height: 90vh;
    border-radius: 12px;
    box-shadow: 0 20px 60px var(--bg-dark);
    animation: zoomIn .25s ease;
}

.close-modal {
    position: absolute;
    top: 20px;
    right: 30px;
    font-size: 3rem;
    color: white;
    cursor: pointer;
    line-height: 1;
    transition: transform .2s ease;
}

.close-modal:hover {
    transform: scale(1.1);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to   { opacity: 1; }
}

@keyframes zoomIn {
    from {
        opacity: 0;
        transform: scale(.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--bg-primary);
    padding: 32px 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    color: var(--neutral-600);
    margin-bottom: 4px;
}

.footer-text strong {
    color: var(--primary-600);
}

.footer-year {
    font-size: 0.75rem;
    color: var(--neutral-600);
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Intersection Observer animation classes */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}

.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --section-padding: 80px;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .about-image {
        max-width: 450px;
        margin: 0 auto;
    }

    .projects-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .skills-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 64px;
    }

    /* Mobile Nav */
    .nav-toggle {
        display: flex;

    }

    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--bg-primary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        padding: 0;
        gap: 32px;
        transition: right 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55); /* Bouncy entrance */
        z-index: 1;
    }

    .nav-menu.active {
        right: 0;
    }

    .nav-menu .nav-link {
        color: var(--text-primary);
        padding: 8px 16px;
        font-size: 1.5rem;
        font-weight: 700;
        letter-spacing: 0.05em;
        background: transparent;
        position: relative;
    }

    .nav-menu .nav-link::after {
        content: '';
        position: absolute;
        bottom: 0;
        left: 50%;
        width: 0;
        height: 3px;
        background: var(--gradient-accent);
        transition: all 0.3s ease;
        transform: translateX(-50%);
        border-radius: 2px;
    }

    .nav-menu .nav-link:hover {
        background: transparent;
        color: var(--primary-500);
    }

    .nav-menu .nav-link:hover::after,
    .nav-menu .nav-link.active::after {
        width: 100%;
    }

    .nav-menu .nav-link-cta {
        margin-top: 24px;
        font-size: 1.125rem;
        font-weight: 600;
        background: var(--gradient-primary) !important;
        color: var(--text-on-primary) !important;
        padding: 16px 40px;
        border-radius: var(--radius-full);
        box-shadow: 0 4px 20px rgba(59, 125, 216, 0.3);
        border: none !important;
    }

    .nav-menu .nav-link-cta::after {
        display: none; /* Remove underline for CTA */
    }

    .nav-menu .nav-link-cta:hover {
        transform: translateY(-2px);
        box-shadow: 0 8px 30px rgba(59, 125, 216, 0.4);
    }

    .navbar.scrolled .nav-menu .nav-link {
        color: var(--text-primary);
    }

    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }

    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(5px, -5px);
    }

    /* Hero */
    .hero {
        padding: 100px 20px 80px;
    }

    .hero-stats {
        flex-direction: column;
        gap: 24px;
    }

    .stat-divider {
        width: 40px;
        height: 1px;
    }

    .hero-actions {
        flex-direction: column;
    }

    .hero-actions .btn {
        width: 100%;
        justify-content: center;
    }

    /* Projects */
    .projects-grid {
        grid-template-columns: 1fr;
    }

    /* Skills */
    .skills-grid {
        grid-template-columns: 1fr;
    }

    /* Contact */
    .contact-cards {
        grid-template-columns: 1fr;
        max-width: 360px;
        margin: 0 auto 48px;
    }

    /* Education */
    .education-card {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
    }

    /* Timeline */
    .timeline::before {
        left: 16px;
    }

    .timeline-item {
        padding-left: 52px;
    }

    .timeline-marker {
        left: 6px;
    }

    .timeline-content {
        padding: 24px;
    }

    .timeline-header {
        flex-direction: column;
    }

    .section-header {
        margin-bottom: 48px;
    }
}

@media (max-width: 480px) {
    .hero-name {
        font-size: 2.25rem;
    }

    .hero-role {
        font-size: 1rem;
    }

    .timeline-list li {
        flex-direction: column;
        gap: 4px;
    }

    .achievement-icon {
        margin-top: 0;
    }
}

@media (max-width: 768px) {
    .contact-form-card {
        padding: 24px;
    }
 
    .contact-form-row {
        grid-template-columns: 1fr;
    }
 
    .contact-form-footer {
        flex-direction: column;
        align-items: flex-start;
    }
 
    .contact-form-footer .btn {
        width: 100%;
        justify-content: center;
    }
}

@media (max-width: 1024px) {
    .feature-card {
        gap: 32px;
        padding: 24px;
    }

    .feature-content h3 {
        font-size: 1.25rem;
    }
}

@media (max-width: 768px) {
    .features-grid {
        gap: 32px;
    }

    .feature-card {
        grid-template-columns: 1fr;
        gap: 20px;
        padding: 20px;
    }

    .feature-card.reverse .feature-image,
    .feature-card.reverse .feature-content {
        order: initial;
    }

    .feature-image {
        aspect-ratio: 16 / 9;
    }

    .section-description {
        margin: -24px auto 48px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .feature-card {
        padding: 16px;
        border-radius: var(--radius-lg);
    }

    .feature-content h3 {
        font-size: 1.125rem;
    }

    .feature-content p,
    .feature-content ul li {
        font-size: 0.9375rem;
    }
}

/* ============================================
   Caso de Estudio: Bot de WhatsApp
   ============================================ */
.whatsapp-features {
    background: var(--bg-primary);
}

.whatsapp-showcase {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: center;
    max-width: 1000px;
    margin: 40px auto 0;
}

/* Phone Simulator */
.phone-simulator-container {
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.phone-frame {
    width: 320px;
    height: 640px;
    border-radius: 40px;
    border: 12px solid #1e293b;
    background: #000;
    box-shadow: var(--shadow-xl), 0 0 0 2px #475569, var(--shadow-glow);
    position: relative;
    overflow: hidden;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

.phone-speaker {
    position: absolute;
    top: 15px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: #334155;
    border-radius: var(--radius-full);
    z-index: 100;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #ece5dd;
    border-radius: 28px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    position: relative;
}

.phone-home {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 4px;
    background: #334155;
    border-radius: var(--radius-full);
    z-index: 100;
}

/* WhatsApp Chat Interface inside Phone */
.whatsapp-chat-header {
    background: #075e54;
    color: #fff;
    padding: 28px 12px 10px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-primary);
    box-shadow: var(--shadow-sm);
    z-index: 10;
    position: relative;
    transition: background var(--transition-base);
}

.whatsapp-chat-back {
    display: flex;
    align-items: center;
    color: #fff;
    opacity: 0.8;
}

.whatsapp-chat-avatar {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
}

.whatsapp-chat-info {
    display: flex;
    flex-direction: column;
    flex-grow: 1;
}

.whatsapp-chat-name {
    font-size: 0.85rem;
    font-weight: 600;
    line-height: 1.2;
}

.whatsapp-chat-status {
    font-size: 0.65rem;
    opacity: 0.8;
}

.whatsapp-chat-actions {
    color: #fff;
    opacity: 0.8;
    display: flex;
    align-items: center;
}

.whatsapp-chat-body {
    flex-grow: 1;
    position: relative;
    background: #efeae2;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    padding: 12px;
    transition: background var(--transition-base);
}

/* Carousel inside Chat */
.whatsapp-carousel-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.whatsapp-carousel-slides {
    width: 100%;
    height: 100%;
    position: relative;
    background: #fff;
    transition: background var(--transition-base);
}

.whatsapp-carousel-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #fff;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1), background var(--transition-base);
}

.whatsapp-carousel-slide.active {
    opacity: 1;
    pointer-events: auto;
}

.whatsapp-carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    cursor: zoom-in;
}

.whatsapp-carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.9);
    border: 1px solid rgba(0,0,0,0.05);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #334155;
    cursor: pointer;
    transition: all var(--transition-base);
    z-index: 5;
    box-shadow: var(--shadow-sm);
}

.whatsapp-carousel-btn:hover {
    background: #fff;
    color: var(--primary-500);
    transform: translateY(-50%) scale(1.05);
}

.whatsapp-carousel-btn svg {
    width: 20px;
    height: 20px;
}

.whatsapp-carousel-btn.prev {
    left: 8px;
}

.whatsapp-carousel-btn.next {
    right: 8px;
}

/* Explanation Panel */
.step-explanation-card {
    background: var(--bg-card);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-xl);
    padding: 40px;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    position: relative;
}

.step-badge {
    display: inline-block;
    padding: 6px 16px;
    background: var(--primary-50);
    border: 1px solid var(--primary-100);
    color: var(--primary-600);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 600;
    margin-bottom: 24px;
    transition: all var(--transition-base);
}

.step-explanation-card h3 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--neutral-900);
    margin-bottom: 16px;
    line-height: 1.3;
    transition: color var(--transition-base);
}

.step-explanation-card p {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 24px;
    transition: color var(--transition-base);
}

.step-details-box {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: 24px;
    margin-bottom: 32px;
    border: 1px solid var(--neutral-200);
    transition: all var(--transition-base);
}

.step-details-box h4 {
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--primary-500);
    font-weight: 700;
    margin-bottom: 12px;
    transition: color var(--transition-base);
}

.step-details-box ul {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.step-details-box ul li {
    position: relative;
    padding-left: 24px;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
    transition: color var(--transition-base);
}

.step-details-box ul li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--primary-500);
    font-weight: 700;
    transition: color var(--transition-base);
}

.whatsapp-indicators {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-top: 16px;
    justify-content: flex-start;
}

.whatsapp-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--neutral-300);
    cursor: pointer;
    transition: all var(--transition-base);
}

.whatsapp-indicator:hover {
    background: var(--primary-300);
}

.whatsapp-indicator.active {
    background: var(--primary-500);
    width: 24px;
    border-radius: var(--radius-full);
}

/* === DARK MODE ADAPTATIONS === */
[data-theme="dark"] .phone-frame {
    border-color: #0f172a;
    box-shadow: var(--shadow-xl), 0 0 0 2px #1e293b, var(--shadow-glow);
}

[data-theme="dark"] .whatsapp-chat-header {
    background: #1f2c34;
}

[data-theme="dark"] .whatsapp-chat-body {
    background: #0b141a;
}

[data-theme="dark"] .whatsapp-carousel-slides,
[data-theme="dark"] .whatsapp-carousel-slide {
    background: #0b141a;
}

[data-theme="dark"] .whatsapp-carousel-btn {
    background: rgba(30, 41, 59, 0.85);
    border-color: rgba(255,255,255,0.05);
    color: #e2e8f0;
}

[data-theme="dark"] .whatsapp-carousel-btn:hover {
    background: #1e293b;
    color: var(--primary-400);
}

[data-theme="dark"] .step-badge {
    background: rgba(79, 144, 219, 0.1);
    border-color: rgba(79, 144, 219, 0.2);
    color: var(--primary-400);
}

/* === RESPONSIVE STYLES === */
@media (max-width: 900px) {
    .whatsapp-showcase {
        grid-template-columns: 1fr;
        gap: 48px;
    }

    .phone-simulator-container {
        order: 1;
    }

    .step-explanation-card {
        order: 2;
        padding: 32px 24px;
    }
}

@media (max-width: 480px) {
    .step-explanation-card {
        padding: 24px 16px;
        border-radius: var(--radius-lg);
    }

    .step-explanation-card h3 {
        font-size: 1.35rem;
    }

    .step-details-box {
        padding: 16px;
    }

    .phone-frame {
        width: 290px;
        height: 580px;
    }
}