/* ============================================
   CSS Variables & Base Styles
   ============================================ */
:root {
    --nav-height: 80px; /* fixed navbar height — used for scroll-margin-top */

    /* Colors */
    --color-bg-dark: #0a0a0a;
    --color-bg-light: #f5f5f5;
    --color-primary: #6366f1;
    --color-primary-dark: #4f46e5;
    --color-secondary: #8b5cf6;
    --color-text-dark: #1a1a1a;
    --color-text-light: #ffffff;
    --color-text-muted: #c8d0e2;
    --color-card-bg: rgba(255, 255, 255, 0.05);
    --color-card-border: rgba(255, 255, 255, 0.1);
    --color-tech-tag: #6366f1;
    --color-tech-tag-bg: rgba(99, 102, 241, 0.15);
    --color-gradient-mid: #1a1a2e;
    --color-gradient-end: #16213e;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-heading: 'Montserrat', var(--font-primary);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 5rem;

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;

    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.2);
    /* Additional Variables */
    --spacing-2xs: 0.25rem;

    /* Tag-specific micro-spacing (intentionally smaller than spacing scale) */
    --tag-padding: 0.125rem 0.625rem;
    --tag-gap: 10px;
    /* Nav text is always white — nav has a fixed dark background regardless of theme */
    --color-nav-text: #ffffff;

    /* Overlay / glass colors */
    --color-nav-bg: rgba(10, 10, 10, 0.95);
    --color-nav-mobile-bg: rgba(10, 10, 10, 0.98);
    --color-overlay-light: rgba(0, 0, 0, 0.3);
    --color-overlay-medium: rgba(0, 0, 0, 0.6);
    --color-nav-shadow: rgba(0, 0, 0, 0.4);
    --color-bg-subtle: rgba(255, 255, 255, 0.03);
    --color-section-divider: rgba(255, 255, 255, 0.1);
    --color-dot-inactive: rgba(255, 255, 255, 0.3);
    --color-dot-hover: rgba(255, 255, 255, 0.6);

    /* Primary glass / accent overlays */
    --color-primary-glass: rgba(99, 102, 241, 0.8);
    --color-primary-glow: rgba(99, 102, 241, 0.15);
    --color-secondary-glow: rgba(139, 92, 246, 0.1);
    --color-contact-hover: rgba(99, 102, 241, 0.2);
    --color-focus-ring: rgba(99, 102, 241, 0.3);
    --color-accordion-bg: rgba(99, 102, 241, 0.12);
    --color-accordion-border: rgba(99, 102, 241, 0.25);
    --color-tech-tag-border: rgba(99, 102, 241, 0.3);
}

/* Light theme overrides — disabled, always dark theme */

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

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

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

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

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

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

ul {
    list-style: none;
}

button {
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

/* ============================================
   Animations (Fade-up on scroll) — unused, kept for compatibility
   ============================================ */
.fade-up {
    transform: translateY(30px);
    transition: transform 0.6s ease;
}

.fade-up.visible {
    transform: translateY(0);
}

/* Anchor scroll offset — compensates for fixed navbar height */
#about,
#experience,
#projects,
#details {
    scroll-margin-top: var(--nav-height);
}

/* ============================================
   Navigation
   ============================================ */
.site-nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: var(--color-nav-bg);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-card-border);
    transition: transform var(--transition-normal);
}

.nav-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: center;
    align-items: center;
}

.burger {
    display: none;
    color: var(--color-nav-text);
    padding: var(--spacing-xs);
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-links a {
    color: var(--color-nav-text);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-xs) var(--spacing-sm);
    position: relative;
    transition: color var(--transition-fast);
}

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

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
    left: 0;
}

/* Mobile Navigation */
@media (max-width: 768px) {
    .nav-container {
        justify-content: flex-end;
    }

    .burger {
        display: block;
        z-index: 1001;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100vh;
        background: var(--color-nav-mobile-bg);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: var(--spacing-xl);
        transform: translateX(-100%);
        transition: transform var(--transition-normal);
    }

    .nav-links.active {
        transform: translateX(0);
    }

    .nav-links a {
        font-size: 1.5rem;
    }
}

/* ============================================
   Hero Section
   ============================================ */
.hero-section {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-bg-dark) 0%, var(--color-gradient-mid) 50%, var(--color-gradient-end) 100%);
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(ellipse at 30% 20%, var(--color-primary-glow) 0%, transparent 50%),
                radial-gradient(ellipse at 70% 80%, var(--color-secondary-glow) 0%, transparent 50%);
    animation: pulse 15s ease-in-out infinite alternate;
}

@keyframes pulse {
    0% { opacity: 0.5; transform: scale(1); }
    100% { opacity: 1; transform: scale(1.05); }
}

.overlay {
    position: relative;
    z-index: 1;
    text-align: center;
    width: 100%;
    max-width: 900px;
    box-sizing: border-box;
    padding: var(--spacing-lg);
}

.overlay h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-text-light) 0%, var(--color-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
    letter-spacing: -0.02em;
}

.overlay h2 {
    font-family: var(--font-primary);
    font-size: clamp(1.2rem, 3vw, 1.8rem);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-md);
    letter-spacing: 0.05em;
    text-transform: uppercase;
}

.hero-tagline {
    font-size: clamp(1rem, 2vw, 1.3rem);
    color: var(--color-primary);
    font-weight: 500;
    margin-top: var(--spacing-lg);
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    text-align: center;
}

.scroll {
    margin-top: var(--spacing-2xl);
    animation: bounce 2s infinite;
    display: inline-block;
    cursor: pointer;
    text-decoration: none;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% { transform: translateY(0); }
    40% { transform: translateY(-10px); }
    60% { transform: translateY(-5px); }
}

.scroll-cover svg {
    opacity: 0.7;
}

/* ============================================
   About Section
   ============================================ */
.about-section {
    padding: var(--spacing-2xl) 0;
}

.about-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: 12px;
}

.about-content h1 {
    font-size: clamp(2rem, 5vw, 3rem);
}

.state {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0;
}

.avatar {
    width: 180px;
    height: 180px;
    border-radius: 50%;
    object-fit: cover;
    border: 4px solid var(--color-primary);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal);
}

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

.text h2 {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 0;
}

.experience {
    font-size: 1rem;
    color: var(--color-primary);
    font-weight: 500;
    margin-bottom: var(--spacing-md);
}

.age-info {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    margin-top: -4px;
}

.intro {
    font-size: 1.1rem;
    color: var(--color-text-muted);
    max-width: 800px;
    line-height: 1.8;
    margin: var(--spacing-sm) 0 0;
    padding: 0 var(--spacing-md);
    text-align: center;
}

.intro-block { margin: 0; padding: 0; }
.intro--center { text-align: center !important; }
.intro--left    { text-align: left; }

.tech-section {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 16px;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-top: 48px;
    text-align: justify;
}

.tech-section h3 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-text-light);
    text-align: center;
}

.tech-section p {
    color: var(--color-text-muted);
    line-height: 1.8;
}

/* ============================================
   Experience Section (Timeline)
   ============================================ */
.experience-section {
    padding: var(--spacing-2xl) 0;
    overflow-x: hidden;
}

.experience-section .container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.section-header {
    display: flex;
    flex-direction: column;
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-header h1 {
    font-family: var(--font-heading);
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 700;
    color: var(--color-text-light);
}

.section-subtitle {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* ── Timeline wrapper ── */
/* Specificity 0-2-0 overrides .container (0-1-0) */
.experience-section .timeline {
    position: relative;
    padding-left: 0;
}

.timeline::before {
    content: none;
}

/* ── Timeline items ── */
.timeline-item {
    position: relative;
    padding-left: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

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

/* ── Dot marker ── */
.timeline-marker {
    position: absolute;
    left: 0;
    top: 22px;
}

.company-dot {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
    border: 3px solid var(--color-bg-dark);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--color-primary);
    position: relative;
    z-index: 2;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.company-dot:hover {
    transform: scale(1.3);
    box-shadow: 0 0 0 6px var(--color-focus-ring);
}

.timeline-line {
    display: none;
}

.timeline-line-last {
    display: none;
}

/* ── Company card ── */
.timeline-content {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 20px;
    padding: var(--spacing-xl);
    margin-left: 0;
    backdrop-filter: blur(10px);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
    box-shadow: var(--shadow-sm);
    opacity: 1;
    transform: none;
}

.timeline-content:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
}

/* ── Accordion header ── */
.company-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    cursor: pointer;
    gap: var(--spacing-sm);
}

.company-info {
    flex: 1;
    min-width: 0;
}

.company-name {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: 4px;
    line-height: 1.2;
}

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

.company-period {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.accordion-toggle {
    flex-shrink: 0;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background: var(--color-accordion-bg);
    color: var(--color-primary);
    font-size: 1.4rem;
    line-height: 1;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
    border: 1px solid var(--color-accordion-border);
}

.accordion-toggle:hover {
    background: var(--color-primary);
    color: var(--color-text-light);
}

.accordion-toggle.active {
    transform: rotate(45deg);
    background: var(--color-primary);
    color: var(--color-text-light);
}

/* ── Projects accordion ── */
.projects-accordion {
    max-height: 0;
    overflow: hidden;
    margin-top: 0;
    padding-top: 0;
    border-top: 1px solid transparent;
    /* duration set dynamically via JS based on content height */
    transition: max-height 0.4s ease,
                margin-top 0.4s ease,
                padding-top 0.4s ease,
                border-top-color 0.4s ease;
}

.projects-accordion.open {
    margin-top: var(--spacing-md);
    padding-top: var(--spacing-md);
    border-top-color: var(--color-section-divider);
}

.project-card {
    background: var(--color-bg-subtle);
    border-radius: 10px;
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    border: 1px solid transparent;
    transition: border-color var(--transition-fast), background var(--transition-fast), padding-bottom var(--transition-fast);
}

.project-card:last-child {
    margin-bottom: 0;
}

.project-card:hover {
    border-color: var(--color-card-border);
    background: var(--color-card-bg);
    padding-bottom: calc(var(--spacing-md) + var(--spacing-sm));
}

.project-title-small {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    line-height: 1.3;
}

.project-link {
    margin-bottom: 0.2rem;
}

.project-link a {
    color: var(--color-primary);
    font-size: 0.875rem;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.project-link a:hover {
    color: var(--color-secondary);
}

.project-card-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2xs) var(--spacing-md);
    align-items: center;
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.project-card-meta .strong {
    color: var(--color-text-light);
}

.project-card .project-desc {
    padding-top: var(--spacing-xs);
    border-top: 1px solid var(--color-card-border);
    margin-top: var(--spacing-xs);
    margin-bottom: 0;
}

.project-desc {
    color: var(--color-text-muted);
    font-size: 0.875rem;
    line-height: 1.6;
    margin-bottom: var(--spacing-sm);
}

.tech-tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--tag-gap);
    margin-top: var(--spacing-xs);
}

/* ── Card etalon — DESIGN_SYSTEM reference block ── */
.project-content {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: 20px;
    padding: var(--spacing-xl);
    backdrop-filter: blur(10px);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

.project-content:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

/* ── Carousel (shared, used inside project-content cards) ── */
.carousel-section {
    margin-top: var(--spacing-lg);
}

.slider-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: var(--color-card-bg);
    aspect-ratio: 16 / 9;
}

.slider {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    height: 100%;
}

.slider::-webkit-scrollbar {
    display: none;
}

.slide {
    width: 100%;
    min-width: 100%;
    flex-shrink: 0;
    height: 100%;
    object-fit: cover;
    display: block;
    opacity: 0;
    transition: opacity 0.4s ease;
    scroll-snap-align: start;
}

.slide.loaded {
    opacity: 1;
}

.arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    background: var(--color-overlay-medium);
    color: var(--color-text-light);
    border: none;
    border-radius: 50%;
    width: 44px;
    height: 44px;
    font-size: 1.5rem;
    line-height: 1;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    transition: background var(--transition-fast);
    backdrop-filter: blur(4px);
}

.arrow:hover {
    background: var(--color-primary);
}

.arrow.left  { left: var(--spacing-sm); padding-right: 2px; }
.arrow.right { right: var(--spacing-sm); padding-left: 2px; }

.dots {
    display: flex;
    justify-content: center;
    gap: var(--spacing-xs);
    margin-top: var(--spacing-sm);
    padding: 4px 0;
}

.dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--color-dot-inactive);
    cursor: pointer;
    transition: background var(--transition-fast), transform var(--transition-fast);
}

.dot:hover,
.dot.active {
    background: var(--color-primary);
    transform: scale(1.3);
}

/* ── Full project cards inside accordion ── */
.project-card-full {
    /* inherits .project-content: card bg, border, border-radius, backdrop-filter */
    margin-bottom: var(--spacing-lg);
}

.project-card-full:last-child {
    margin-bottom: 0;
}

.project-card-header {
    margin-bottom: var(--spacing-sm);
}

.project-card-title {
    font-family: var(--font-heading);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-xs);
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: var(--spacing-sm);
}

.project-card-link-badge a {
    font-family: var(--font-primary);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--color-primary);
    text-decoration: none;
    transition: var(--transition-fast);
}

.project-card-link-badge a:hover {
    opacity: 0.8;
}

.project-meta {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-2xs) var(--spacing-md);
    margin-top: var(--spacing-xs);
    width: 100%;
}

.project-meta-item {
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

.project-meta-item strong {
    color: var(--color-text-light);
}

.project-card-meta-item:has(a), 
.project-meta-item:has(a) {
    margin-left: auto;
}

.project-full-desc {
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-bottom: var(--spacing-md);
    font-size: 0.95rem;
}

.project-card-tags {
    margin-bottom: var(--spacing-md);
}

/* Carousel inside accordion project card */
.project-card-full .carousel-section {
    margin-top: var(--spacing-md);
    border-radius: 12px;
    overflow: hidden;
}

.project-card-full .slider-wrapper {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
}

.project-card-full .slider {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    scrollbar-width: none;
    height: 100%;
}

.project-card-full .slider::-webkit-scrollbar {
    display: none;
}

.project-card-full .slide {
    width: 100%;
    min-width: 100%;
    flex-shrink: 0;
    height: 100%;
    object-fit: cover;
}

/* ── Mobile ── */
@media (max-width: 768px) {
    .experience-section .container {
        padding: 0 var(--spacing-sm);
    }

    .experience-section .timeline {
        padding-left: 10px;
    }

    .timeline::before {
        content: none;
    }

    .timeline-item {
        padding-left: var(--spacing-sm); /* 16px: aligns card with other sections on mobile */
    }

    .timeline-marker {
        left: 0;
    }

    .company-dot {
        width: 10px;
        height: 10px;
        box-shadow: 0 0 0 2px var(--color-primary);
    }


    .company-name {
        font-size: 1.25rem;
    }

    .timeline-content {
        padding: var(--spacing-md);
    }

    .project-card {
        padding: var(--spacing-sm);
    }

    /* Full project cards inside accordion — reduce padding on mobile */
    .project-content {
        padding: var(--spacing-md);
    }

    /* Meta items (role + duration) — wrap gracefully on mobile */
    .project-meta {
        flex-direction: column;
    }

    .project-card-meta-item:has(a), 
    .project-meta-item:has(a) {
        margin-left: 0;
    }

    /* Carousel maintains 16:9 via aspect-ratio on wrapper */
}

/* ============================================
   Utility Classes
   ============================================ */
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
}

.text-block {
    max-width: 700px;
    margin: 0 auto;
    margin-bottom: var(--spacing-lg);
}

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

/* ============================================
   Scroll-reveal animations (added by script.js)
   Content is always visible (DESIGN_SYSTEM: no opacity:0 default).
   JS adds .reveal class for progressive enhancement.
   ============================================ */
.reveal {
    /* opacity stays 1 — content visible without JS */
    transform: translateY(20px);
    transition: transform 0.6s ease;
}

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

/* Navbar shadow on scroll */
.site-nav.scrolled {
    box-shadow: 0 2px 20px var(--color-nav-shadow);
}

/* ============================================
   Contacts — link-group & icons
   ============================================ */
.icon {
    width: 32px;
    height: 32px;
    min-width: 32px;
    min-height: 32px;
    flex-shrink: 0;
    display: block;
}

.press-link .icon {
    width: 40px;
    height: 40px;
    min-width: 40px;
    min-height: 40px;
}

.link-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    justify-content: center;
    margin-top: var(--spacing-md);
}

.contact-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    color: var(--color-text-light);
    text-decoration: none;
    transition: background-color 0.4s ease-in-out;
    font-size: 0.95rem;
}

.contact-link:hover {
    background-color: var(--color-contact-hover);
}

/* ============================================
   About Cards (Обо мне)
   ============================================ */
.about-paragraphs {
    display: grid;
    grid-template-columns: 1fr 1fr;
    grid-template-rows: auto auto;
    gap: var(--spacing-sm);
    width: 100%;
}

.about-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-left: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    line-height: 1.7;
    text-align: justify;
    color: var(--color-text-muted);
}

.about-card.tall {
    grid-row: 1 / 3;
}

.details-section .about-content > h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    width: 100%;
    text-align: center;
}

/* ── Section headings inside #details (Навыки, Образование) ── */
/* color intentionally omitted: dark mode inherits white from body,
   light mode inherits dark from .details-section media-query override */
.details-section .about-content > h2 {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
    width: 100%;
    text-align: center;
}

/* ── Education wrapper ── */
.education {
    width: 100%;
}

/* ============================================
   Skills Grid (Навыки)
   ============================================ */
.skills-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-sm);
    width: 100%;
}

.skill-category {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.skill-category--wide {
    grid-column: 1 / -1;
}

.skill-category:hover {
    border-color: var(--color-accordion-border);
    box-shadow: var(--shadow-sm);
}

.skill-category__title {
    font-family: var(--font-heading);
    font-weight: 600;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-sm);
    font-size: 0.9rem;
    text-align: center;
}

.skill-category__tags {
    display: flex;
    flex-wrap: wrap;
    gap: var(--tag-gap);
    justify-content: space-between;
}

.skill-category__tags .tag {
    flex: 1 1 auto;
    text-align: center;
    justify-content: center;
}

.tag,
.tech-tag {
    display: inline-flex;
    align-items: center;
    background: var(--color-tech-tag-bg);
    color: var(--color-bg-light);
    border: 1px solid var(--color-tech-tag-border);
    padding: var(--spacing-2xs) var(--spacing-xs);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
    cursor: default;
}

.skill-category__tags .tag:hover,
.tech-tag:hover {
    background: var(--color-primary);
    border-color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

@media (max-width: 768px) {
    .skills-grid {
        grid-template-columns: 1fr;
    }

    .about-paragraphs {
        grid-template-columns: 1fr; /* Одна колонка на мобилках */
    }
    
    .about-card.tall {
        grid-row: auto; /* Сбрасываем растяжение по вертикали */
    }
}

/* ============================================
   Education Card (Образование)
   ============================================ */
.education-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-card-border);
    border-top: 3px solid var(--color-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    width: 100%;
}

.education-card__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: var(--spacing-xs);
}

.education-card__institution {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-text-light);
}

.education-card__period {
    font-size: 0.8rem;
    color: var(--color-text-muted);
    white-space: nowrap;
    margin-left: var(--spacing-sm);
}

.education-card__faculty {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    margin: var(--spacing-xs) 0;
}

.education-card__degree {
    font-size: 1rem;
    font-weight: 500;
}

.education-card__qualification {
    display: block;
    font-size: 1rem;
    color: var(--color-primary);
    margin-top: var(--spacing-xs);
}

/* ============================================
   Back to Top Button
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--color-primary);
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition-fast), visibility var(--transition-fast), background var(--transition-fast);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--color-secondary);
}

/* ============================================
   Footer
   ============================================ */
.site-footer {
    padding: var(--spacing-lg) var(--spacing-md);
    text-align: center;
    border-top: 1px solid var(--color-card-border);
}

.site-footer p {
    font-family: var(--font-primary);
    font-size: 0.875rem;
    color: var(--color-text-muted);
}

@media (max-width: 768px) {
    .site-footer {
        padding: var(--spacing-md) var(--spacing-sm);
    }
}