/* ========================================
   GOD-TIER MINIMALIST PORTFOLIO
   ======================================== */

/* ========================================
   1. CSS VARIABLES & RESET
   ======================================== */

:root {
    /* Colors - Refined Minimalist Palette */
    --color-bg: #FAFAFA;
    --color-bg-elevated: #FFFFFF;
    --color-text-primary: #0D0D0D;
    --color-text-secondary: #525252;
    --color-text-tertiary: #8A8A8A;
    --color-border: #E8E8E8;
    --color-border-subtle: #F0F0F0;
    --color-hover: #000000;
    --color-accent: #F5F5F5;
    --color-accent-hover: #EBEBEB;
    --color-success: #10B981;

    /* Timeline specific */
    --timeline-line: #E0E0E0;
    --timeline-dot: #0D0D0D;
    --timeline-dot-ring: rgba(13, 13, 13, 0.1);

    /* Typography */
    --font-heading: 'Crimson Pro', Georgia, serif;
    --font-body: 'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;

    /* Type Scale */
    --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: 2rem;
    --text-4xl: 2.5rem;
    --text-5xl: 3.5rem;
    --text-6xl: 4.5rem;
    --text-7xl: 6rem;

    /* Spacing */
    --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;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 720px;
    --container-wide: 1400px;

    /* Effects */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 8px 30px rgba(0, 0, 0, 0.08);
    --shadow-xl: 0 20px 50px rgba(0, 0, 0, 0.1);

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text-primary);
    background-color: var(--color-bg);
    font-weight: 400;
    letter-spacing: -0.01em;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--space-8);
}

.container-narrow {
    max-width: var(--container-narrow);
}

/* ========================================
   2. TYPOGRAPHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.15;
    color: var(--color-text-primary);
    letter-spacing: -0.03em;
}

.section-label {
    display: inline-flex;
    align-items: center;
    gap: var(--space-3);
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

.section-label::before {
    content: '';
    width: 32px;
    height: 1px;
    background: var(--color-text-tertiary);
}

.section-title {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-6);
    letter-spacing: -0.03em;
}

.section-header {
    margin-bottom: var(--space-16);
}

.section-header.centered {
    text-align: center;
}

.section-header.centered .section-label {
    justify-content: center;
}

.section-header.centered .section-label::before {
    display: none;
}

.section-description {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    max-width: 540px;
    line-height: 1.6;
}

.section-header.centered .section-description {
    margin: 0 auto;
}

/* ========================================
   3. NAVIGATION
   ======================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    transition: all var(--transition-base);
}

.navbar.scrolled {
    background-color: rgba(250, 250, 250, 0.9);
    backdrop-filter: blur(20px) saturate(180%);
    -webkit-backdrop-filter: blur(20px) saturate(180%);
    border-bottom: 1px solid var(--color-border-subtle);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--space-5) var(--space-8);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--color-text-primary);
    transition: opacity var(--transition-fast);
}

.logo:hover { opacity: 0.7; }

.logo-dot {
    color: var(--color-text-tertiary);
}

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

.nav-link {
    font-size: var(--text-sm);
    font-weight: 450;
    color: var(--color-text-secondary);
    letter-spacing: 0.02em;
    transition: color var(--transition-fast);
    position: relative;
    padding: var(--space-2) 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-text-primary);
    transition: width var(--transition-base);
}

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

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

.nav-link-cta {
    background: var(--color-text-primary);
    color: var(--color-bg) !important;
    padding: var(--space-2) var(--space-5) !important;
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.nav-link-cta::after { display: none; }

.nav-link-cta:hover {
    background: var(--color-hover);
    transform: translateY(-1px);
}

.nav-socials {
    display: flex;
    gap: var(--space-2);
}

.social-icon {
    color: var(--color-text-tertiary);
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-2);
    border-radius: var(--radius-sm);
    width: 36px;
    height: 36px;
}

.social-icon:hover {
    color: var(--color-text-primary);
    background: var(--color-accent);
}

/* Mobile Menu */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    padding: var(--space-2);
}

.menu-toggle span {
    width: 22px;
    height: 1.5px;
    background-color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ========================================
   4. HERO SECTION
   ======================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: var(--space-32) 0 var(--space-24);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,0,0,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,0,0,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
}

.hero-content {
    max-width: 900px;
    position: relative;
    z-index: 1;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    margin-bottom: var(--space-8);
    box-shadow: var(--shadow-sm);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

.hero-greeting {
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.hero-greeting::before {
    content: '';
    width: 40px;
    height: 1px;
    background: var(--color-text-tertiary);
}

.hero-name {
    font-size: var(--text-7xl);
    font-weight: 600;
    margin-bottom: var(--space-6);
    letter-spacing: -0.04em;
    line-height: 0.95;
    background: linear-gradient(135deg, var(--color-text-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-roles {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.role-item {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    font-weight: 400;
}

.role-divider {
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-border);
}

.hero-tagline {
    font-size: var(--text-lg);
    line-height: 1.7;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-10);
    max-width: 600px;
}

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

/* Hero Social Links */
.hero-socials {
    display: flex;
    align-items: center;
    gap: var(--space-6);
    padding-top: var(--space-8);
    border-top: 1px solid var(--color-border-subtle);
}

.hero-socials-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    font-weight: 450;
}

.hero-socials-links {
    display: flex;
    gap: var(--space-4);
}

.hero-social-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.hero-social-link:hover {
    color: var(--color-text-primary);
    background: var(--color-accent);
}

.hero-social-link svg {
    flex-shrink: 0;
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-10);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-3);
    color: var(--color-text-tertiary);
    font-size: var(--text-xs);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    transition: opacity var(--transition-base);
}

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

@keyframes scrollPulse {
    0%, 100% { opacity: 1; transform: scaleY(1); }
    50% { opacity: 0.5; transform: scaleY(0.8); }
}

/* ========================================
   5. BUTTONS
   ======================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-6);
    font-family: var(--font-body);
    font-size: var(--text-sm);
    font-weight: 500;
    letter-spacing: 0.02em;
    border: none;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    cursor: pointer;
}

.btn svg {
    width: 18px;
    height: 18px;
    transition: transform var(--transition-fast);
}

.btn-primary {
    background: var(--color-text-primary);
    color: var(--color-bg);
}

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

.btn-primary:hover svg {
    transform: translateX(4px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1.5px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-text-primary);
    background: var(--color-accent);
}

.btn-outline {
    background: transparent;
    border: 1.5px solid var(--color-border);
    color: var(--color-text-secondary);
}

.btn-outline:hover:not(.disabled) {
    border-color: var(--color-text-primary);
    color: var(--color-text-primary);
}

.btn.disabled {
    opacity: 0.4;
    cursor: not-allowed;
    pointer-events: none;
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-xs);
}

.btn-sm svg {
    width: 16px;
    height: 16px;
}

.btn-icon {
    transition: transform var(--transition-fast);
}

/* Spinner */
.spinner {
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ========================================
   6. ABOUT SECTION
   ======================================== */

.about {
    padding: var(--space-24) 0;
    background: var(--color-bg-elevated);
}

.about-content {
    display: grid;
    grid-template-columns: 300px 1fr;
    gap: var(--space-16);
    align-items: start;
}

.about-image {
    position: sticky;
    top: 120px;
}

.image-placeholder {
    width: 100%;
    aspect-ratio: 1;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-bg) 100%);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
    position: relative;
    z-index: 1;
}

.about-image-decoration {
    position: absolute;
    top: var(--space-4);
    left: var(--space-4);
    right: calc(-1 * var(--space-4));
    bottom: calc(-1 * var(--space-4));
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    z-index: 0;
}

.about-bio {
    margin-bottom: var(--space-8);
}

.about-bio p {
    margin-bottom: var(--space-5);
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.about-bio p:first-child::first-letter {
    font-family: var(--font-heading);
    font-size: var(--text-4xl);
    font-weight: 600;
    float: left;
    line-height: 1;
    margin-right: var(--space-3);
    margin-top: var(--space-1);
    color: var(--color-text-primary);
}

.about-details {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-6);
    margin-bottom: var(--space-8);
}

.about-detail-item {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    padding: var(--space-2) var(--space-4);
    background: var(--color-accent);
    border-radius: var(--radius-full);
}

.about-detail-item svg {
    color: var(--color-text-tertiary);
}

.about-cta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-4);
}

/* ========================================
   7. EXPERIENCE & EDUCATION TIMELINE
   ======================================== */

.experience,
.education {
    padding: var(--space-24) 0;
}

.experience { background: var(--color-bg); }
.education { background: var(--color-bg-elevated); }

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

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 1px;
    background: var(--timeline-line);
}

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

.timeline-item:last-child { padding-bottom: 0; }

.timeline-item::before {
    content: '';
    position: absolute;
    left: -5px;
    top: var(--space-1);
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--color-bg);
    border: 2px solid var(--timeline-dot);
    z-index: 2;
    transition: all var(--transition-fast);
}

.timeline-item::after {
    content: '';
    position: absolute;
    left: -11px;
    top: calc(var(--space-1) - 6px);
    width: 23px;
    height: 23px;
    border-radius: 50%;
    background: var(--timeline-dot-ring);
    z-index: 1;
    transform: scale(0);
    transition: transform var(--transition-base);
}

.timeline-item:hover::after { transform: scale(1); }
.timeline-item:hover::before { background: var(--timeline-dot); }

.timeline-header {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--space-3);
    margin-bottom: var(--space-2);
}

.timeline-date {
    font-size: var(--text-xs);
    font-weight: 500;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    background: var(--color-accent);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
}

.timeline-status {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-success);
    background: rgba(16, 185, 129, 0.1);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-sm);
}

.timeline-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 600;
    color: var(--color-text-primary);
    letter-spacing: -0.02em;
    margin-bottom: var(--space-1);
}

.timeline-subtitle {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.timeline-location {
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

.timeline-location svg {
    width: 14px;
    height: 14px;
}

.timeline-description {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    line-height: 1.7;
}

.timeline-description ul {
    list-style: none;
    margin-top: var(--space-3);
}

.timeline-description li {
    position: relative;
    padding-left: var(--space-5);
    margin-bottom: var(--space-2);
}

.timeline-description li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0.6em;
    width: 6px;
    height: 1px;
    background: var(--color-text-tertiary);
}

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

.timeline-tag {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    background: var(--color-accent);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* ========================================
   8. PROJECTS SECTION
   ======================================== */

.projects {
    padding: var(--space-24) 0;
    background: var(--color-bg);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-8);
}

.project-card {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all var(--transition-base);
}

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

.project-image {
    width: 100%;
    aspect-ratio: 16/10;
    overflow: hidden;
    background: var(--color-accent);
    position: relative;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.image-placeholder-project {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-border-subtle) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-tertiary);
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: rgba(13, 13, 13, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-overlay span {
    color: white;
    font-size: var(--text-sm);
    font-weight: 500;
    padding: var(--space-3) var(--space-5);
    border: 1px solid white;
    border-radius: var(--radius-sm);
}

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

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

.project-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.project-tag {
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
}

.project-year {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

.project-title {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    margin-bottom: var(--space-3);
    font-weight: 600;
}

.project-description {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-5);
    font-size: var(--text-sm);
    line-height: 1.7;
}

.project-tech {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-2);
    margin-bottom: var(--space-5);
}

.tech-badge {
    font-size: var(--text-xs);
    padding: var(--space-1) var(--space-3);
    background: var(--color-accent);
    color: var(--color-text-secondary);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

.project-links {
    display: flex;
    gap: var(--space-5);
    padding-top: var(--space-5);
    border-top: 1px solid var(--color-border-subtle);
}

.project-link {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

.project-link:hover:not(.disabled) {
    color: var(--color-text-secondary);
}

.project-link.disabled {
    opacity: 0.35;
    cursor: not-allowed;
    pointer-events: none;
}

/* Project Placeholder Card */
.project-card-placeholder {
    border-style: dashed;
    background: transparent;
}

.project-card-placeholder:hover {
    transform: none;
    box-shadow: none;
}

.project-placeholder-content {
    padding: var(--space-12);
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 400px;
}

.project-placeholder-icon {
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-5);
    opacity: 0.5;
}

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

.project-placeholder-text {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-6);
    max-width: 280px;
}

/* ========================================
   9. SKILLS SECTION
   ======================================== */

.skills {
    padding: var(--space-24) 0;
    background: var(--color-bg-elevated);
}

.skills-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
    margin-bottom: var(--space-12);
}

.skill-category {
    text-align: center;
    padding: var(--space-8);
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

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

.skill-category-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto var(--space-5);
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
}

.skill-category-icon svg {
    width: 28px;
    height: 28px;
}

.skill-category-title {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    margin-bottom: var(--space-5);
    font-weight: 600;
}

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

.skill-list li {
    padding: var(--space-3) 0;
    color: var(--color-text-secondary);
    font-size: var(--text-sm);
    border-bottom: 1px solid var(--color-border-subtle);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.skill-list li:last-child { border-bottom: none; }

.skill-level {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    font-weight: 500;
}

/* LeetCode Banner */
.leetcode-banner {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-6);
}

.leetcode-banner-content {
    display: flex;
    align-items: center;
    gap: var(--space-6);
}

.leetcode-banner-icon {
    width: 64px;
    height: 64px;
    background: #FFA116;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    flex-shrink: 0;
}

.leetcode-banner-text {
    flex: 1;
}

.leetcode-banner-text h4 {
    font-family: var(--font-heading);
    font-size: var(--text-lg);
    margin-bottom: var(--space-1);
}

.leetcode-banner-text p {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
}

/* ========================================
   10. CONTACT SECTION
   ======================================== */

.contact {
    padding: var(--space-24) 0;
    background: var(--color-bg);
}

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

.contact-info .section-title {
    margin-bottom: var(--space-5);
}

.contact-description {
    font-size: var(--text-base);
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-8);
}

.contact-methods {
    margin-bottom: var(--space-8);
}

.contact-method {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    padding: var(--space-4);
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.contact-method:hover {
    border-color: var(--color-text-primary);
    transform: translateX(4px);
}

.contact-method-icon {
    width: 48px;
    height: 48px;
    background: var(--color-accent);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
}

.contact-method-text {
    display: flex;
    flex-direction: column;
}

.contact-method-label {
    font-size: var(--text-xs);
    color: var(--color-text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.contact-method-value {
    font-size: var(--text-base);
    color: var(--color-text-primary);
    font-weight: 500;
}

.contact-socials-label {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-4);
}

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

.contact-social-link {
    width: 48px;
    height: 48px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.contact-social-link:hover {
    border-color: var(--color-text-primary);
    color: var(--color-text-primary);
    background: var(--color-accent);
}

.contact-form-wrapper {
    background: var(--color-bg-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: var(--space-5);
}

.form-group label {
    display: block;
    font-size: var(--text-sm);
    font-weight: 500;
    margin-bottom: var(--space-2);
    color: var(--color-text-primary);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--space-4);
    font-family: var(--font-body);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    background: var(--color-bg);
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-text-primary);
    box-shadow: 0 0 0 3px rgba(13, 13, 13, 0.05);
}

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

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

.submit-btn {
    width: 100%;
    padding: var(--space-5);
    margin-top: var(--space-3);
}

.form-message {
    padding: var(--space-4);
    border-radius: var(--radius-md);
    text-align: center;
    font-size: var(--text-sm);
}

.form-message.success {
    color: #166534;
    background: #dcfce7;
}

.form-message.error {
    color: #991b1b;
    background: #fee2e2;
}

/* ========================================
   11. FOOTER
   ======================================== */

.footer {
    padding: var(--space-16) 0 var(--space-8);
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
}

.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 1fr auto;
    gap: var(--space-12);
    padding-bottom: var(--space-12);
    border-bottom: 1px solid var(--color-border-subtle);
    margin-bottom: var(--space-8);
}

.footer-brand {
    max-width: 320px;
}

.footer-logo {
    font-family: var(--font-heading);
    font-size: var(--text-xl);
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--color-text-primary);
    margin-bottom: var(--space-4);
    display: block;
}

.footer-tagline {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

.footer-links {
    display: flex;
    gap: var(--space-12);
}

.footer-links-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer-links-title {
    font-family: var(--font-body);
    font-size: var(--text-xs);
    font-weight: 600;
    letter-spacing: 0.1em;
    text-transform: uppercase;
    color: var(--color-text-tertiary);
    margin-bottom: var(--space-2);
}

.footer-links-group a {
    font-size: var(--text-sm);
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

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

.footer-socials {
    display: flex;
    gap: var(--space-2);
}

.footer-socials .social-icon {
    background: var(--color-accent);
}

.footer-socials .social-icon:hover {
    background: var(--color-text-primary);
    color: var(--color-bg);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.copyright {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

.copyright-year {
    font-size: var(--text-sm);
    color: var(--color-text-tertiary);
}

/* ========================================
   12. UTILITIES
   ======================================== */

.hidden { display: none !important; }

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* ========================================
   13. ANIMATIONS
   ======================================== */

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

[data-aos] {
    transition-property: opacity, transform;
    transition-duration: 0.7s;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

[data-aos="fade-up"] {
    opacity: 0;
    transform: translateY(30px);
}

[data-aos="fade-up"].aos-animate {
    opacity: 1;
    transform: translateY(0);
}

[data-aos-delay="100"] { transition-delay: 0.1s; }
[data-aos-delay="200"] { transition-delay: 0.2s; }
[data-aos-delay="300"] { transition-delay: 0.3s; }

.hero-content > * {
    opacity: 0;
    animation: fadeInUp 0.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.hero-badge { animation-delay: 0s; }
.hero-greeting { animation-delay: 0.1s; }
.hero-name { animation-delay: 0.2s; }
.hero-roles { animation-delay: 0.3s; }
.hero-tagline { animation-delay: 0.4s; }
.hero-cta { animation-delay: 0.5s; }
.hero-socials { animation-delay: 0.6s; }

/* ========================================
   14. RESPONSIVE
   ======================================== */

@media (max-width: 1023px) {
    :root {
        --text-7xl: 4.5rem;
        --text-6xl: 3.5rem;
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
    }

    .about-content {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }

    .about-image {
        position: static;
        max-width: 280px;
        margin: 0 auto;
    }

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

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

    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: var(--space-12);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--space-8);
    }

    .footer-links {
        gap: var(--space-8);
    }
}

@media (max-width: 767px) {
    :root {
        --text-7xl: 3rem;
        --text-6xl: 2.5rem;
        --text-5xl: 2rem;
        --text-4xl: 1.75rem;
        --space-24: 4rem;
        --space-20: 3.5rem;
        --space-16: 3rem;
    }

    .container { padding: 0 var(--space-5); }

    /* Mobile Nav */
    .nav-menu {
        position: fixed;
        top: 68px;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--color-bg-elevated);
        border-bottom: 1px solid var(--color-border);
        padding: var(--space-5);
        gap: 0;
        transform: translateY(-110%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-base);
        box-shadow: var(--shadow-lg);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-menu li { border-bottom: 1px solid var(--color-border-subtle); }
    .nav-menu li:last-child { border-bottom: none; }

    .nav-link {
        display: block;
        padding: var(--space-4) 0;
        font-size: var(--text-base);
    }

    .nav-link::after { display: none; }

    .nav-link-cta {
        margin-top: var(--space-3);
        text-align: center;
    }

    .nav-socials { display: none; }
    .menu-toggle { display: flex; }

    /* Hero */
    .hero {
        padding: var(--space-24) 0 var(--space-16);
        min-height: auto;
    }

    .hero-name { line-height: 1.05; }

    .hero-roles {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

    .role-divider { display: none; }

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

    .hero-cta .btn { width: 100%; }

    .hero-socials {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-4);
    }

    .hero-socials-links {
        flex-wrap: wrap;
        gap: var(--space-3);
    }

    .hero-social-link span { display: none; }

    .scroll-indicator { display: none; }

    /* Timeline */
    .timeline-item {
        padding-left: var(--space-8);
        padding-bottom: var(--space-10);
    }

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--space-2);
    }

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

    .leetcode-banner-content {
        flex-direction: column;
        text-align: center;
    }

    /* Contact */
    .contact-form-wrapper {
        padding: var(--space-6);
    }

    /* Footer */
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-2);
        text-align: center;
    }
}

@media (max-width: 479px) {
    :root {
        --text-7xl: 2.5rem;
    }

    .hero-greeting::before { width: 24px; }

    .hero-badge {
        font-size: var(--text-xs);
        padding: var(--space-1) var(--space-3);
    }

    .about-cta {
        flex-direction: column;
    }

    .about-cta .btn {
        width: 100%;
    }
}