/* ========================================
   CSS CUSTOM PROPERTIES - DESIGN SYSTEM
   ======================================== */
:root {
    /* Color Palette */
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-primary-light: #818cf8;
    --color-secondary: #ec4899;
    --color-secondary-dark: #db2777;
    --color-accent: #14b8a6;
    
    /* Neutral Colors */
    --color-bg: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;
    --color-border: #334155;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-display: 'Playfair Display', Georgia, serif;
    
    /* Font Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-24: 6rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* 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);
    
    /* Z-Index */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-tooltip: 600;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ========================================
   TYPOGRAPHY
   ======================================== */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-text);
    margin-bottom: var(--space-4);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

p {
    margin-bottom: var(--space-4);
    color: var(--color-text-secondary);
}

.lead {
    font-size: var(--text-lg);
    font-weight: 500;
    color: var(--color-text);
}

a {
    color: var(--color-primary-light);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-primary);
}

/* ========================================
   LAYOUT & CONTAINERS
   ======================================== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

.section {
    padding: var(--space-24) 0;
    position: relative;
}

/* ========================================
   NAVIGATION
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background: rgba(15, 23, 42, 0.95);
    box-shadow: var(--shadow-lg);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
}

.logo {
    font-size: var(--text-2xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: transform var(--transition-fast);
}

.logo:hover {
    transform: scale(1.05);
}

.nav-menu {
    display: flex;
    gap: var(--space-8);
    list-style: none;
}

.nav-link {
    position: relative;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: var(--space-2) 0;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: width var(--transition-base);
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-text);
}

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
}

.nav-toggle span {
    width: 25px;
    height: 2px;
    background: var(--color-text);
    transition: all var(--transition-base);
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: var(--space-2);
    align-items: center;
    margin-left: var(--space-4);
}

.lang-btn {
    background: none;
    border: 2px solid transparent;
    cursor: pointer;
    padding: var(--space-1);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.lang-btn img {
    width: 28px;
    height: 28px;
    display: block;
    border-radius: var(--radius-sm);
}

.lang-btn:hover {
    border-color: var(--color-primary);
    transform: scale(1.1);
}

.lang-btn.active {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
}

/* ========================================
   HERO SECTION
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 80px;
}

.hero-background {
    position: absolute;
    inset: 0;
    z-index: -1;
    overflow: hidden;
}

.hero-banner {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    z-index: 0;
    animation: slowZoom 20s ease-in-out infinite alternate;
}

@keyframes slowZoom {
    0% { transform: scale(1); }
    100% { transform: scale(1.05); }
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.92) 0%,
        rgba(30, 41, 59, 0.88) 50%,
        rgba(15, 23, 42, 0.92) 100%
    );
    z-index: 1;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.25;
    animation: float 20s infinite ease-in-out;
    z-index: 2;
}

.orb-1 {
    width: 500px;
    height: 500px;
    background: var(--color-primary);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.orb-2 {
    width: 400px;
    height: 400px;
    background: var(--color-secondary);
    bottom: -10%;
    right: 10%;
    animation-delay: -7s;
}

.orb-3 {
    width: 350px;
    height: 350px;
    background: var(--color-accent);
    top: 50%;
    right: -10%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
}

.hero-content {
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero-title {
    font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
    font-family: var(--font-display);
    margin-bottom: var(--space-6);
    animation: fadeInUp 1s ease-out;
}

.text-gradient {
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: var(--text-2xl);
    color: var(--color-primary-light);
    margin-bottom: var(--space-4);
    animation: fadeInUp 1s ease-out 0.2s both;
}

.hero-description {
    font-size: var(--text-lg);
    max-width: 600px;
    margin: 0 auto var(--space-8);
    color: var(--color-text-secondary);
    animation: fadeInUp 1s ease-out 0.4s both;
}

.hero-cta {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1s ease-out 0.6s both;
}
    60% { transform: translateX(-50%) translateY(-5px); }
}

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

/* ========================================
   BUTTONS
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    font-weight: 600;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

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

.btn-secondary:hover {
    border-color: var(--color-primary);
    background: rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

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

/* ========================================
   SECTION TITLES
   ======================================== */
.section-title {
    text-align: center;
    font-size: var(--text-4xl);
    font-family: var(--font-display);
    margin-bottom: var(--space-16);
    width: 100%;
}

.section-title::after {
    content: '';
    display: block;
    margin: var(--space-4) auto 0;
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: var(--radius-full);
}

/* ========================================
   ABOUT SECTION
   ======================================== */
.about-section {
    background: var(--color-bg-secondary);
}

.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-12);
    align-items: start;
}

.about-image-container {
    position: relative;
}

.profile-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    border: 3px solid var(--color-primary);
    box-shadow: var(--shadow-2xl);
    transition: all var(--transition-base);
}

.profile-image:hover {
    transform: scale(1.05);
    box-shadow: 0 20px 40px rgba(99, 102, 241, 0.3);
}

.language-badges {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-top: var(--space-6);
    justify-content: center;
}

.language-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.05));
    border: 1px solid rgba(99, 102, 241, 0.3);
    border-radius: var(--radius-full);
    color: var(--color-text);
    font-size: var(--text-sm);
    font-weight: 500;
    transition: all var(--transition-fast);
    cursor: default;
}

.language-badge:hover {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.2), rgba(236, 72, 153, 0.1));
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.language-badge svg {
    width: 16px;
    height: 16px;
    stroke: var(--color-primary-light);
}

.about-text {
    max-width: 900px;
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.skill-category {
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.skill-category:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.skill-category h3 {
    color: var(--color-primary-light);
    margin-bottom: var(--space-6);
}

.skill-list {
    list-style: none;
}

.skill-list li {
    padding: var(--space-3) 0;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--space-6);
}

.skill-list li::before {
    content: '→';
    position: absolute;
    left: 0;
    color: var(--color-primary);
}

/* ========================================
   EXPERIENCE SECTION - TIMELINE
   ======================================== */
.certifications-section {
    background: var(--color-bg);
}

/* Certification Overview Banner */
.cert-overview-banner {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.15), rgba(236, 72, 153, 0.1));
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-8);
    margin-bottom: var(--space-12);
    display: flex;
    align-items: center;
    gap: var(--space-8);
    transition: all var(--transition-base);
}

.cert-overview-banner:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-xl);
}

.cert-overview-content {
    flex: 1;
}

.cert-overview-content h3 {
    font-size: var(--text-2xl);
    color: var(--color-primary-light);
    margin-bottom: var(--space-6);
}

.certifications-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.cert-card {
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
    align-items: center;
}

.cert-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.cert-logo {
    width: 100%;
    max-width: 200px;
    height: 150px;
    margin: 0 auto var(--space-6);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-4);
}

.cert-logo img {
    max-width: 100%;
    max-height: 100%;
    width: auto;
    height: auto;
    object-fit: contain;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1));
    transition: all var(--transition-base);
}

.cert-card:hover .cert-logo img {
    transform: scale(1.05);
    filter: drop-shadow(0 8px 12px rgba(99, 102, 241, 0.3));
}

.cert-card h3 {
    color: var(--color-text);
    font-size: var(--text-lg);
    margin-bottom: var(--space-3);
}

.cert-summary-icon {
    flex-shrink: 0;
}

.cert-summary-icon svg {
    stroke: var(--color-primary-light);
    opacity: 0.8;
}

.cert-summary-stats {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-8);
    width: 100%;
}

.cert-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.cert-stat-value {
    font-size: var(--text-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1;
}

.cert-stat-label {
    font-size: var(--text-xs);
    color: var(--color-text-secondary);
    text-align: center;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.cert-card p {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    margin: 0 0 var(--space-4) 0;
    flex: 1;
}

.cert-date {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-top: auto;
    margin-bottom: var(--space-3);
}

.cert-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    color: var(--color-primary-light);
    font-size: var(--text-sm);
    font-weight: 600;
    text-decoration: none;
    border-bottom: 2px solid transparent;
    transition: all var(--transition-fast);
    padding: var(--space-1) 0;
}

.cert-link:hover {
    color: var(--color-primary);
    border-bottom-color: var(--color-primary);
    gap: var(--space-2);
}

.achievements-box {
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.05));
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-primary);
}

.achievements-box h3 {
    color: var(--color-primary-light);
    font-size: var(--text-xl);
    margin-bottom: var(--space-6);
}

.achievements-box ul {
    list-style: none;
    padding: 0;
}

.achievements-box li {
    padding: var(--space-3) 0;
    padding-left: var(--space-8);
    color: var(--color-text-secondary);
    position: relative;
    line-height: 1.8;
}

.achievements-box li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
    font-size: var(--text-xl);
}

.achievements-box strong {
    color: var(--color-text);
}

/* ========================================
   ACADEMICS SECTION - TRANSCRIPT
   ======================================== */
.academics-section {
    background: var(--color-bg);
}

.academics-summary {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
    margin-bottom: var(--space-12);
}

.stat-box {
    background: linear-gradient(135deg, var(--color-surface), var(--color-bg-secondary));
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    text-align: center;
    transition: all var(--transition-base);
}

.stat-box:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.stat-box .stat-value {
    font-size: var(--text-4xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: var(--space-3);
}

.stat-box .stat-label {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.transcript-container {
    margin-bottom: var(--space-12);
}

.transcript-header {
    margin-bottom: var(--space-6);
}

.transcript-header h3 {
    color: var(--color-primary-light);
    font-size: var(--text-2xl);
    margin-bottom: var(--space-3);
}

.transcript-header p {
    color: var(--color-text-muted);
    font-size: var(--text-base);
}

.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--space-6);
}

.course-card {
    background: var(--color-surface);
    padding: var(--space-6);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.course-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.course-info {
    margin-bottom: var(--space-4);
}

.course-info h4 {
    color: var(--color-text);
    font-size: var(--text-lg);
    margin-bottom: var(--space-2);
}

.course-details {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    flex-wrap: wrap;
}

.course-credits {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
}

.course-grade {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: var(--text-sm);
}

.course-grade.vg {
    background: rgba(34, 197, 94, 0.1);
    color: #4ade80;
    border: 1px solid rgba(34, 197, 94, 0.3);
}

.course-grade.grade-5 {
    background: rgba(59, 130, 246, 0.1);
    color: #60a5fa;
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.course-grade.grade-4 {
    background: rgba(168, 85, 247, 0.1);
    color: #c084fc;
    border: 1px solid rgba(168, 85, 247, 0.3);
}

.course-grade.grade-3 {
    background: rgba(249, 115, 22, 0.1);
    color: #fb923c;
    border: 1px solid rgba(249, 115, 22, 0.3);
}

.course-grade.g {
    background: rgba(148, 163, 184, 0.1);
    color: #94a3b8;
    border: 1px solid rgba(148, 163, 184, 0.3);
}

.course-date {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    margin-top: var(--space-2);
}

.courses-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.course-row {
    display: grid;
    grid-template-columns: 1fr auto auto auto;
    gap: var(--space-4);
    align-items: center;
    padding: var(--space-4);
    background: var(--color-surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    transition: all var(--transition-fast);
}

.course-row:hover {
    background: var(--color-bg-tertiary);
    border-color: var(--color-primary);
}

.course-row .course-name {
    color: var(--color-text);
    font-weight: 500;
}

.course-row .course-credits {
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    white-space: nowrap;
}

.course-row .course-grade {
    min-width: 80px;
    text-align: center;
}

.course-row .course-date {
    color: var(--color-text-muted);
    font-size: var(--text-xs);
    white-space: nowrap;
}

.transcript-footer {
    text-align: center;
    margin-top: var(--space-12);
}

.transcript-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    width: 100%;
    max-width: 400px;
    margin: var(--space-8) auto;
    padding: var(--space-4) var(--space-6);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
    color: var(--color-text);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.transcript-toggle:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
}

.transcript-toggle:active {
    transform: translateY(0);
}

.transcript-toggle .toggle-icon {
    transition: transform var(--transition-base);
}

.transcript-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
}

.transcript-collapsible {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.transcript-collapsible.expanded {
    max-height: 10000px;
}

.transcript-note {
    color: var(--color-text-muted);
    font-size: var(--text-sm);
    margin-top: var(--space-4);
}

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

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
    padding-left: var(--space-8);
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
}

.timeline-item {
    position: relative;
    margin-bottom: var(--space-12);
    padding-left: var(--space-12);
}

.timeline-marker {
    position: absolute;
    left: -7px;
    top: 8px;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--color-primary);
    box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 6px var(--color-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 6px var(--color-primary); }
    50% { box-shadow: 0 0 0 4px var(--color-bg), 0 0 0 12px rgba(99, 102, 241, 0.3); }
}

.timeline-content {
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(10px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.timeline-date {
    display: inline-block;
    padding: var(--space-2) var(--space-4);
    background: rgba(99, 102, 241, 0.1);
    color: var(--color-primary-light);
    border-radius: var(--radius-md);
    font-size: var(--text-sm);
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.timeline-content h3 {
    color: var(--color-text);
    margin-bottom: var(--space-2);
}

.timeline-content h4 {
    color: var(--color-text-muted);
    font-weight: 500;
    margin-bottom: var(--space-4);
}

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

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: var(--space-8);
}

.project-card {
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-10px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-2xl);
}

.project-image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
}

.project-content {
    padding: var(--space-6);
    flex: 1;
    display: flex;
    flex-direction: column;
}

.project-title {
    font-size: var(--text-xl);
    margin-bottom: var(--space-3);
    color: var(--color-text);
}

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-6);
    flex: 1;
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--color-primary-light);
    font-weight: 600;
    transition: gap var(--transition-fast);
}

.project-link:hover {
    gap: var(--space-3);
}

/* ========================================
   CV SECTION
   ======================================== */
.cv-section {
    background: var(--color-bg-secondary);
}

.cv-content {
    max-width: 700px;
    margin: 0 auto;
    text-align: center;
}

.cv-intro {
    font-size: var(--text-lg);
    margin-bottom: var(--space-8);
}

.cv-actions {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   CONTACT SECTION
   ======================================== */
.contact-section {
    background: var(--color-bg);
    position: relative;
    overflow: hidden;
}

.contact-background {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.contact-banner {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
    animation: slowZoom 20s ease-in-out infinite alternate;
}

.contact-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.94) 0%,
        rgba(30, 41, 59, 0.92) 50%,
        rgba(15, 23, 42, 0.94) 100%
    );
}

.contact-section .container {
    position: relative;
    z-index: 1;
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact-intro {
    font-size: var(--text-lg);
    margin-bottom: var(--space-12);
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-6);
}

.contact-card {
    background: var(--color-surface);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    transition: all var(--transition-base);
    text-decoration: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
}

.contact-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-xl);
}

.contact-card svg {
    color: var(--color-primary-light);
}

.contact-card h3 {
    color: var(--color-text);
    margin: 0;
}

.contact-card p {
    color: var(--color-text-secondary);
    margin: 0;
}

.contact-cta {
    display: flex;
    justify-content: center;
    margin-top: var(--space-8);
}

.btn-lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* ========================================
   FOOTER
   ========================================*/
.footer {
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    padding: var(--space-8) 0;
    text-align: center;
}

.footer-links {
    margin-top: var(--space-4);
}

.footer-links a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary-light);
}

/* ========================================
   MODAL
   ======================================== */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    z-index: var(--z-modal);
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    animation: fadeIn var(--transition-base);
}

.modal.active {
    display: flex;
}

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

.modal-content {
    width: 100%;
    max-width: 1000px;
    max-height: 90vh;
    background: var(--color-surface);
    border-radius: var(--radius-xl);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: slideUp var(--transition-base);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6);
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg-secondary);
}

.modal-header h3 {
    margin: 0;
    font-size: var(--text-xl);
}

.modal-close {
    background: none;
    border: none;
    color: var(--color-text-muted);
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
}

.modal-close:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-text);
}

.modal-body {
    flex: 1;
    overflow: hidden;
}

.cv-iframe {
    width: 100%;
    height: 100%;
    min-height: 600px;
    border: none;
}

/* Modal Form Specific */
.modal-form .modal-content {
    max-width: 600px;
}

.modal-form .modal-body {
    padding: var(--space-8);
    overflow-y: auto;
}

/* Contact Form */
.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-6);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.form-group label {
    font-weight: 500;
    color: var(--color-text);
    font-size: var(--text-sm);
}

.form-group input,
.form-group textarea {
    padding: var(--space-3) var(--space-4);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text);
    font-family: var(--font-primary);
    font-size: var(--text-base);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.form-checkbox {
    margin: var(--space-4) 0;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    cursor: pointer;
    font-size: var(--text-base);
    color: var(--color-text);
    user-select: none;
}

.checkbox-label input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: var(--color-primary);
}

.checkbox-label:hover {
    color: var(--color-primary-light);
}

.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: var(--space-4);
}

.form-status {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: var(--text-sm);
    display: none;
}

.form-status.success {
    display: block;
    background: rgba(34, 197, 94, 0.1);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: #22c55e;
}

.form-status.error {
    display: block;
    background: rgba(239, 68, 68, 0.1);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: #ef4444;
}

/* ========================================
   REVEAL ANIMATIONS
   ======================================== */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all var(--transition-slow);
}

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

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */
@media (max-width: 992px) {
    .certifications-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        flex-direction: column;
        background: var(--color-bg-secondary);
        width: 100%;
        padding: var(--space-8);
        gap: var(--space-4);
        border-top: 1px solid var(--color-border);
        transition: left var(--transition-base);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(8px, 8px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -7px);
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 300px;
        justify-content: center;
    }
    
    .section {
        padding: var(--space-16) 0;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .timeline {
        padding-left: var(--space-6);
    }
    
    .timeline-item {
        padding-left: var(--space-8);
    }
    
    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }
    
    .about-image-container {
        max-width: 300px;
        margin: 0 auto;
    }
    
    .language-badges {
        gap: var(--space-2);
    }
    
    .language-badge {
        font-size: var(--text-xs);
        padding: var(--space-1) var(--space-3);
    }
    
    .language-switcher {
        position: absolute;
        top: var(--space-4);
        right: 80px;
    }
    
    .course-row {
        grid-template-columns: 1fr;
        gap: var(--space-2);
    }
    
    .course-row .course-name {
        font-size: var(--text-base);
    }
    
    .course-row .course-credits,
    .course-row .course-date {
        font-size: var(--text-xs);
    }
    
    .courses-grid {
        grid-template-columns: 1fr;
    }
    
    .transcript-toggle {
        max-width: 100%;
        padding: var(--space-3) var(--space-4);
        font-size: var(--text-sm);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .certifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .cert-overview-banner {
        flex-direction: column;
        text-align: center;
        gap: var(--space-4);
    }
    
    .cert-summary-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
}

@media (max-width: 480px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
    }
    
    .container {
        padding: 0 var(--space-4);
    }
    
    .certifications-grid {
        grid-template-columns: 1fr;
    }
    
    .cert-summary-stats {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--space-4);
    }
    
    .cert-stat-value {
        font-size: var(--text-2xl);
    }
    
    .cert-stat-label {
        font-size: 0.65rem;
    }
}