/* ==================== VARIABLES ==================== */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #10b981;
    --secondary-dark: #059669;
    --accent: #f59e0b;
    
    /* Neutral Colors */
    --dark: #1e293b;
    --dark-light: #334155;
    --light: #64748b;
    --lighter: #94a3b8;
    --white: #ffffff;
    --black: #000000;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    
    /* Spacing Scale */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-light: 300;
    --font-regular: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    --text-xs: clamp(0.75rem, 1.5vw, 0.875rem);
    --text-sm: clamp(0.875rem, 1.8vw, 1rem);
    --text-base: clamp(1rem, 2vw, 1.125rem);
    --text-lg: clamp(1.125rem, 2.2vw, 1.25rem);
    --text-xl: clamp(1.25rem, 2.5vw, 1.5rem);
    --text-2xl: clamp(1.5rem, 3vw, 2rem);
    --text-3xl: clamp(2rem, 4vw, 2.5rem);
    --text-4xl: clamp(2.5rem, 5vw, 3rem);
    --text-5xl: clamp(3rem, 6vw, 4rem);
    --text-6xl: clamp(4rem, 8vw, 6rem);
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 25px 60px rgba(0, 0, 0, 0.2);
    
    /* Borders & Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
}

/* Dark Mode */
@media (prefers-color-scheme: dark) {
    :root {
        --dark: #f8fafc;
        --dark-light: #e2e8f0;
        --light: #cbd5e1;
        --lighter: #94a3b8;
        --white: #0f172a;
        --black: #ffffff;
        --gray-50: #1e293b;
        --gray-100: #334155;
        --gray-200: #475569;
        --gray-300: #64748b;
        --gray-400: #94a3b8;
    }
}

/* Dark Mode - Manual Toggle */
body.dark-mode {
    --dark: #f8fafc;
    --dark-light: #e2e8f0;
    --light: #cbd5e1;
    --lighter: #94a3b8;
    --white: #0f172a;
    --black: #ffffff;
    --gray-50: #1e293b;
    --gray-100: #334155;
    --gray-200: #475569;
    --gray-300: #64748b;
    --gray-400: #94a3b8;
}

/* ==================== BASE STYLES ==================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--dark);
    background: var(--white);
    overflow-x: hidden;
    transition: background-color var(--transition-normal);
}

/* Skip Link */
.skip-link {
    position: absolute;
    top: -3rem;
    left: var(--space-4);
    background: var(--primary);
    color: var(--white);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-sm);
    transition: top var(--transition-fast);
    z-index: 1000;
    font-weight: var(--font-medium);
}

.skip-link:focus {
    top: var(--space-2);
}

/* Container */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

/* ==================== HEADER ==================== */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--white);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
    background: var(--white);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-3) var(--space-4);
}

.logo {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--primary);
    text-decoration: none;
    display: flex;
    align-items: center;
}

.logo-initial {
    display: inline-block;
    width: 40px;
    height: 40px;
    background: var(--primary);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-weight: var(--font-bold);
    font-size: var(--text-xl);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    transition: transform var(--transition-normal);
}

.nav-toggle[aria-expanded="true"] {
    transform: rotate(90deg);
}

.hamburger-line {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    margin: 5px 0;
    transition: all var(--transition-normal);
    border-radius: var(--radius-sm);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

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

.nav-link {
    color: var(--dark);
    text-decoration: none;
    font-weight: var(--font-medium);
    font-size: var(--text-base);
    position: relative;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    transition: color var(--transition-normal);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: width var(--transition-normal);
}

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

.nav-link:hover::after,
.nav-link.active::after {
    width: 60%;
}

.theme-switch {
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--space-2);
    border-radius: var(--radius-md);
    transition: background var(--transition-normal);
}

.theme-switch:hover {
    background: var(--gray-100);
}

.theme-icon {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.sun {
    opacity: 1;
    transition: opacity var(--transition-normal);
}

.moon {
    opacity: 0;
    transition: opacity var(--transition-normal);
}

/* ==================== SECTIONS ==================== */
section {
    padding: var(--space-32) var(--space-4);
}

.section-header {
    text-align: center;
    max-width: 800px;
    margin: 0 auto var(--space-16);
}

.section-title {
    font-size: var(--text-5xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-3);
    color: var(--dark);
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary);
    border-radius: var(--radius-full);
}

.section-subtitle {
    font-size: var(--text-xl);
    color: var(--light);
    font-weight: var(--font-regular);
}

/* ==================== HERO ==================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    background: rgba(99, 102, 241, 0.04);
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-24);
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-4);
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: rgba(99, 102, 241, 0.1);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-6);
    font-weight: var(--font-medium);
    color: var(--primary);
    font-size: var(--text-sm);
}

.badge-dot {
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: var(--radius-full);
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.hero-title {
    font-size: var(--text-6xl);
    font-weight: var(--font-bold);
    line-height: 1.2;
    margin-bottom: var(--space-6);
    color: var(--dark);
}

.text-gradient {
    color: var(--primary);
    display: inline-block;
}

.hero-description {
    font-size: var(--text-xl);
    color: var(--light);
    margin-bottom: var(--space-8);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--primary);
    display: block;
    margin-bottom: var(--space-1);
    font-variant-numeric: tabular-nums;
}

.stat-label {
    color: var(--light);
    font-weight: var(--font-medium);
    font-size: var(--text-sm);
}

.hero-illustration {
    position: relative;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.illustration-wrapper {
    position: relative;
    width: 100%;
    max-width: 500px;
    height: 500px;
}

.illustration-shapes {
    position: relative;
    width: 100%;
    height: 100%;
}

.shape {
    position: absolute;
    border-radius: var(--radius-full);
    animation: float var(--transition-slow) ease-in-out infinite;
}

.shape-1 {
    width: 250px;
    height: 250px;
    background: var(--primary);
    top: 0;
    left: 0;
    animation-delay: 0s;
}

.shape-2 {
    width: 200px;
    height: 200px;
    background: var(--secondary);
    bottom: 0;
    right: 0;
    animation-delay: 0.5s;
}

.shape-3 {
    width: 150px;
    height: 150px;
    background: var(--accent);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation-delay: 1s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    background: #8b5cf6;
    bottom: 30%;
    left: 20%;
    animation-delay: 1.5s;
}

@keyframes float {
    0%, 100% {
        transform: translate(0, 0) rotate(0deg);
    }
    50% {
        transform: translate(20px, -20px) rotate(10deg);
    }
}

/* ==================== BUTTONS ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-full);
    font-weight: var(--font-semibold);
    font-size: var(--text-base);
    text-decoration: none;
    transition: all var(--transition-normal);
    cursor: pointer;
    border: none;
    outline: none;
    justify-content: center;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-xl);
}

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

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

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

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
}

.btn-text {
    background: transparent;
    color: var(--primary);
    padding: var(--space-2) var(--space-3);
}

.btn-text:hover {
    color: var(--primary-dark);
}

.btn-block {
    width: 100%;
}

/* ==================== ABOUT ==================== */
.about {
    background: var(--gray-50);
}

.about-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-24);
    align-items: center;
}

.about-image {
    position: relative;
}

.image-container {
    position: relative;
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.image-border {
    position: absolute;
    width: 100%;
    height: 100%;
    border-radius: var(--radius-2xl);
    background: var(--primary);
    animation: rotate 3s linear infinite;
    z-index: -1;
    box-shadow: var(--shadow-xl);
}

.image-content {
    width: 90%;
    height: 90%;
    background: var(--white);
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-2xl);
}

.code-svg {
    width: 150px;
    height: 150px;
    color: var(--primary);
}

@keyframes rotate {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}

.about-content {
    max-width: 600px;
}

.about-heading {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-4);
    color: var(--dark);
}

.about-paragraph {
    margin-bottom: var(--space-4);
    line-height: 1.8;
    color: var(--dark-light);
}

/* ==================== PROJECTS ==================== */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.project-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    position: relative;
}

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

.project-image {
    position: relative;
    height: 250px;
    background: var(--primary);
    overflow: hidden;
}

.project-gradient {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: transparent;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.project-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-normal);
}

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

.project-link {
    width: 60px;
    height: 60px;
    background: var(--white);
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--primary);
    transition: all var(--transition-normal);
}

.project-link:hover {
    transform: scale(1.1);
    background: var(--primary);
    color: var(--white);
}

.project-info {
    padding: var(--space-6);
}

.project-tags {
    display: flex;
    gap: var(--space-2);
    margin-bottom: var(--space-4);
    flex-wrap: wrap;
}

.tag {
    background: var(--gray-100);
    color: var(--dark);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
}

.project-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-2);
    color: var(--dark);
}

.project-description {
    color: var(--light);
    margin-bottom: var(--space-4);
    line-height: 1.6;
}

.project-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--lighter);
    font-size: var(--text-sm);
}

.project-role {
    font-weight: var(--font-semibold);
}

.project-date {
    color: var(--primary);
}

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

.skills-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
}

.skill-category {
    background: var(--gray-50);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
}

.category-title {
    font-size: var(--text-3xl);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-6);
    color: var(--dark);
    text-align: center;
}

.skills-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
}

.skill-item {
    padding: var(--space-4);
    background: var(--white);
    border-radius: var(--radius-lg);
    transition: transform var(--transition-normal);
}

.skill-item:hover {
    transform: translateX(5px);
}

.skill-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.skill-name {
    font-weight: var(--font-semibold);
    color: var(--dark);
}

.skill-level-text {
    color: var(--primary);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
}

.skill-bar {
    width: 100%;
    height: 8px;
    background: var(--gray-200);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.skill-progress {
    height: 100%;
    background: var(--primary);
    border-radius: var(--radius-full);
    transition: width var(--transition-slow);
    width: var(--width);
}

/* ==================== EXPERIENCE ==================== */
.experience {
    background: var(--gray-50);
}

.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 32px;
    width: 2px;
    background: var(--primary);
}

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

.timeline-marker {
    position: absolute;
    top: 0;
    left: 24px;
    width: 16px;
    height: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.timeline-dot {
    width: 12px;
    height: 12px;
    background: var(--white);
    border: 2px solid var(--primary);
    border-radius: var(--radius-full);
}

.timeline-content {
    background: var(--white);
    padding: var(--space-6);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    left: -12px;
    width: 24px;
    height: 24px;
    background: var(--white);
    transform: rotate(45deg);
    z-index: -1;
}

.timeline-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-2);
}

.timeline-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--dark);
}

.timeline-year {
    color: var(--primary);
    font-weight: var(--font-semibold);
}

.timeline-company {
    color: var(--primary);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-2);
}

.timeline-description {
    color: var(--light);
    line-height: 1.8;
}

/* ==================== CERTIFICATES ==================== */
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-8);
    margin-top: var(--space-12);
}

.certificate-card {
    background: var(--white);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.certificate-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
}

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

.certificate-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
}

.certificate-icon {
    width: 60px;
    height: 60px;
    background: var(--primary);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
}

.certificate-year {
    background: var(--gray-100);
    color: var(--primary);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: var(--font-bold);
}

.certificate-title {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    color: var(--dark);
    margin-bottom: var(--space-2);
}

.certificate-issuer {
    font-size: var(--text-sm);
    color: var(--primary);
    font-weight: var(--font-semibold);
    margin-bottom: var(--space-3);
}

.certificate-description {
    font-size: var(--text-sm);
    color: var(--light);
    line-height: 1.6;
    margin-bottom: var(--space-4);
}

.certificate-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--primary);
    text-decoration: none;
    font-weight: var(--font-semibold);
    transition: color var(--transition-normal);
    font-size: var(--text-sm);
}

.certificate-link:hover {
    color: var(--primary-dark);
}

/* ==================== CONTACT ==================== */
.contact {
    background: var(--white);
    padding: var(--space-16) var(--space-4);
}

.contact-container {
    max-width: 900px;
    margin: 0 auto;
}

.contact-header {
    text-align: center;
    margin-bottom: var(--space-16);
}

.contact-title {
    font-size: var(--text-5xl);
    font-weight: var(--font-bold);
    color: var(--dark);
    margin-bottom: var(--space-4);
}

.contact-subtitle {
    font-size: var(--text-xl);
    color: var(--light);
    max-width: 600px;
    margin: 0 auto;
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: var(--space-16);
    align-items: start;
}

.contact-methods {
    display: flex;
    flex-direction: column;
    gap: var(--space-8);
}

.method-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-4);
    padding: var(--space-4);
    border-radius: var(--radius-lg);
    background: rgba(99, 102, 241, 0.05);
    transition: all var(--transition-normal);
}

.method-item:hover {
    background: rgba(99, 102, 241, 0.1);
    transform: translateX(5px);
}

.method-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-lg);
    background: var(--primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.method-text {
    flex: 1;
}

.method-label {
    font-size: var(--text-sm);
    font-weight: var(--font-bold);
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--space-1);
}

.method-value {
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    color: var(--dark);
    text-decoration: none;
    word-break: break-all;
}

.method-value:hover {
    color: var(--primary);
}

.contact-form {
    background: rgba(99, 102, 241, 0.03);
    padding: var(--space-8);
    border-radius: var(--radius-xl);
    border: 2px solid rgba(99, 102, 241, 0.1);
}

.form-group {
    margin-bottom: var(--space-5);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-4) var(--space-4);
    border: none;
    border-bottom: 2px solid var(--gray-200);
    background: transparent;
    font-family: var(--font-family);
    font-size: var(--text-base);
    color: var(--dark);
    transition: all var(--transition-normal);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--light);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-bottom-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

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

.btn-submit {
    width: 100%;
    padding: var(--space-4) var(--space-6);
    background: var(--primary);
    color: var(--white);
    border: none;
    border-radius: var(--radius-lg);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    cursor: pointer;
    transition: all var(--transition-normal);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    font-family: var(--font-family);
}

.btn-submit:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Responsive */
@media (max-width: 768px) {
    .contact-content {
        grid-template-columns: 1fr;
    }
    
    .contact-title {
        font-size: var(--text-4xl);
    }
}

.footer {
    background: var(--dark);
    color: var(--white);
    padding: var(--space-16) var(--space-4);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--space-12);
    margin-bottom: var(--space-12);
}

.footer-brand .logo {
    color: var(--white);
    margin-bottom: var(--space-4);
}

.footer-text {
    color: var(--gray-400);
    line-height: 1.8;
}

.footer-links h4,
.footer-social h4 {
    font-size: var(--text-lg);
    font-weight: var(--font-bold);
    margin-bottom: var(--space-4);
    color: var(--white);
}

.footer-links ul {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--space-2);
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    transition: color var(--transition-normal);
}

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

.social-links {
    display: flex;
    gap: var(--space-3);
}

.social-link {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    background: var(--gray-300);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--dark);
    transition: all var(--transition-normal);
}

.social-link:hover {
    background: var(--primary);
    color: var(--white);
    transform: translateY(-3px);
}

.footer-bottom {
    border-top: 1px solid var(--gray-300);
    padding-top: var(--space-6);
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--gray-400);
    font-size: var(--text-sm);
}

/* ==================== SCROLL TO TOP ==================== */
.scroll-to-top {
    position: fixed;
    bottom: var(--space-6);
    right: var(--space-6);
    width: 50px;
    height: 50px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: var(--white);
    border: none;
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
    z-index: 999;
}

.scroll-to-top:hover {
    transform: translateY(-3px);
    background: var(--primary-dark);
}

.scroll-to-top.show {
    display: flex;
}

/* ==================== RESPONSIVE ==================== */
@media (max-width: 1024px) {
    .hero-container {
        grid-template-columns: 1fr;
        text-align: center;
        padding: var(--space-16) var(--space-4);
    }
    
    .hero-content {
        margin: 0 auto;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-stats {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .hero-illustration {
        display: none;
    }
    
    .about-wrapper,
    .contact-wrapper,
    .skills-wrapper {
        grid-template-columns: 1fr;
    }
    
    .about-image {
        order: -1;
    }
    
    .timeline::before {
        left: 20px;
    }
    
    .timeline-item {
        padding-left: var(--space-8) !important;
    }
    
    .timeline-marker {
        left: 12px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-2);
    }
}

@media (max-width: 768px) {
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 300px;
        height: 100vh;
        background: var(--white);
        box-shadow: var(--shadow-xl);
        padding: var(--space-8);
        flex-direction: column;
        transition: right var(--transition-normal);
        z-index: 1001;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-list {
        flex-direction: column;
        gap: var(--space-6);
        margin-bottom: var(--space-8);
    }
    
    .nav-link {
        padding: 0;
        font-size: var(--text-2xl);
    }
    
    .theme-switch {
        margin-top: var(--space-6);
    }
    
    section {
        padding: var(--space-16) var(--space-4);
    }
    
    .section-title {
        font-size: var(--text-4xl);
    }
    
    .hero-title {
        font-size: var(--text-5xl);
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .certificates-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: var(--text-4xl);
    }
    
    .hero-description {
        font-size: var(--text-lg);
    }
    
    .stat-number {
        font-size: var(--text-3xl);
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .certificates-grid {
        grid-template-columns: 1fr;
    }
}