/* ==============================
   АЛЕКСЕЙ ВОРОБЬЕВ — Personal Site
   Palette: Black / Steel Gray / Silver
   Fonts: Space Grotesk + DM Sans
   ============================== */

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

/* --- Theme Variables --- */
:root,
[data-theme="dark"] {
    --color-bg: #0b0b0d;
    --color-bg-alt: #111114;
    --color-surface: #18181b;
    --color-surface-hover: #222226;
    --color-text: #d4d4d8;
    --color-text-secondary: #71717a;
    --color-text-muted: #52525b;
    --color-accent: #a1a1aa;
    --color-accent-bright: #d4d4dc;
    --color-silver: #c0c0c8;
    --color-border: rgba(255, 255, 255, 0.06);
    --color-border-hover: rgba(255, 255, 255, 0.12);
    --color-glow: rgba(160, 160, 175, 0.08);
    --color-hero-gradient: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(160, 160, 180, 0.06) 0%, transparent 70%);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.5);
    --grain-opacity: 0.03;
    --nav-bg: rgba(11, 11, 13, 0.88);
}

[data-theme="light"] {
    --color-bg: #f4f4f5;
    --color-bg-alt: #e8e8ec;
    --color-surface: #ffffff;
    --color-surface-hover: #f0f0f3;
    --color-text: #18181b;
    --color-text-secondary: #52525b;
    --color-text-muted: #a1a1aa;
    --color-accent: #3f3f46;
    --color-accent-bright: #27272a;
    --color-silver: #52525b;
    --color-border: rgba(0, 0, 0, 0.07);
    --color-border-hover: rgba(0, 0, 0, 0.14);
    --color-glow: rgba(0, 0, 0, 0.03);
    --color-hero-gradient: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(0, 0, 0, 0.03) 0%, transparent 70%);
    --shadow-card: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-card-hover: 0 8px 30px rgba(0,0,0,0.08);
    --grain-opacity: 0.015;
    --nav-bg: rgba(244, 244, 245, 0.88);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.65;
    overflow-x: hidden;
    transition: background 0.4s ease, color 0.4s ease;
}

a {
    color: var(--color-accent-bright);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* --- Navbar --- */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 36px;
    height: 60px;
    background: var(--nav-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transition: background 0.4s;
}

.nav-brand {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-accent-bright);
    letter-spacing: 3px;
    user-select: none;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 28px;
}

.nav-links a {
    color: var(--color-text-secondary);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.8rem;
    font-weight: 500;
    letter-spacing: 1px;
    text-transform: uppercase;
    transition: color 0.25s;
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 1px;
    background: var(--color-accent-bright);
    transition: width 0.3s ease;
}

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

.nav-links a:hover {
    color: var(--color-text);
}

.nav-right {
    display: flex;
    align-items: center;
    gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    color: var(--color-text-secondary);
    transition: color 0.25s, border-color 0.25s, background 0.25s;
}

.theme-toggle:hover {
    color: var(--color-text);
    border-color: var(--color-border-hover);
    background: var(--color-glow);
}

[data-theme="dark"] .icon-moon { display: none; }
[data-theme="dark"] .icon-sun { display: block; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

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

.nav-toggle span {
    display: block;
    width: 22px;
    height: 1.5px;
    background: var(--color-text);
    transition: transform 0.3s, opacity 0.3s;
    border-radius: 1px;
}

/* --- Hero --- */
.hero {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 100px 24px 60px;
    position: relative;
    background: var(--color-hero-gradient);
    overflow: hidden;
}

.hero-grain {
    position: absolute;
    inset: 0;
    opacity: var(--grain-opacity);
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
    background-size: 200px;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.hero-intro {
    display: flex;
    align-items: center;
    gap: 32px;
    justify-content: center;
    margin-bottom: 32px;
}

.avatar-ring {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    padding: 2px;
    background: linear-gradient(135deg, #71717a 0%, #d4d4d8 40%, #52525b 60%, #a1a1aa 100%);
    flex-shrink: 0;
}

.avatar-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    display: block;
}

.hero-text {
    text-align: left;
}

.hero-hey {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    font-weight: 400;
    letter-spacing: 1px;
    margin-bottom: 4px;
}

.hero-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3.2rem;
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -1px;
    color: var(--color-text);
}

.hero-surname {
    background: linear-gradient(90deg, var(--color-text), var(--color-text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-tagline {
    font-size: 1.15rem;
    color: var(--color-text-secondary);
    margin-bottom: 28px;
    line-height: 1.6;
}

.hero-tagline em {
    color: var(--color-accent-bright);
    font-style: normal;
    font-weight: 600;
}

.hero-badges {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.badge {
    padding: 6px 16px;
    border-radius: 100px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    letter-spacing: 0.5px;
    transition: background 0.4s, border-color 0.4s;
}

.hero-motto {
    font-style: italic;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.scroll-line {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    width: 1px;
    height: 48px;
    background: linear-gradient(to bottom, var(--color-accent), transparent);
    animation: scrollPulse 2.5s ease-in-out infinite;
}

/* --- Container & Section --- */
.container {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 24px;
}

.section {
    padding: 100px 0;
}

.section-header {
    display: flex;
    align-items: baseline;
    gap: 16px;
    margin-bottom: 48px;
}

.section-label {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    color: var(--color-text-muted);
    letter-spacing: 2px;
    font-weight: 500;
}

.section-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.5px;
}

/* --- About --- */
.about-layout {
    display: grid;
    grid-template-columns: 1.3fr 1fr;
    gap: 56px;
    align-items: start;
}

.about-lead {
    font-size: 1.1rem;
    color: var(--color-text);
    margin-bottom: 16px;
    font-weight: 400;
    line-height: 1.7;
}

.about-main p:not(.about-lead) {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}

.about-meta {
    display: flex;
    flex-direction: column;
    gap: 0;
    border-left: 1px solid var(--color-border);
    padding-left: 24px;
}

.meta-item {
    padding: 14px 0;
    border-bottom: 1px solid var(--color-border);
}

.meta-item:last-child {
    border-bottom: none;
}

.meta-label {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
    font-weight: 500;
}

.meta-value {
    font-size: 0.9rem;
    color: var(--color-text);
}

/* --- Path (Experience) --- */
.path-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.path-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 28px;
    transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s, background 0.4s;
    opacity: 0;
    transform: translateY(16px);
}

.path-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.path-card:hover {
    border-color: var(--color-border-hover);
    box-shadow: var(--shadow-card-hover);
    transform: translateY(-2px);
}

.path-card--featured {
    grid-column: 1 / -1;
    border-color: var(--color-border-hover);
    background: var(--color-surface);
    position: relative;
    overflow: hidden;
}

.path-card--featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
}

.path-period {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.72rem;
    color: var(--color-text-muted);
    letter-spacing: 1.5px;
    text-transform: uppercase;
    margin-bottom: 8px;
    font-weight: 500;
}

.path-company {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 4px;
    color: var(--color-text);
}

.path-role {
    font-size: 0.85rem;
    color: var(--color-text-secondary);
    margin-bottom: 14px;
}

.path-highlights {
    list-style: none;
    padding: 0;
}

.path-highlights li {
    position: relative;
    padding-left: 14px;
    margin-bottom: 5px;
    font-size: 0.84rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
}

.path-highlights li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 8px;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-accent);
}

.path-gratitude {
    text-align: center;
    color: var(--color-text-muted);
    font-style: italic;
    font-size: 0.9rem;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--color-border);
}

/* --- Skills --- */
.skills-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 32px;
}

.skill-block {
    opacity: 0;
    transform: translateY(16px);
    transition: opacity 0.5s, transform 0.5s;
}

.skill-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.skill-block-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 2px;
    color: var(--color-text-muted);
    margin-bottom: 14px;
    font-weight: 600;
}

.skill-pills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-pills span {
    padding: 6px 14px;
    border-radius: 8px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    font-size: 0.8rem;
    color: var(--color-text-secondary);
    transition: border-color 0.25s, color 0.25s, background 0.4s;
}

.skill-pills span:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text);
}

/* --- Project Showcase --- */
.project-showcase {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: background 0.4s, border-color 0.3s;
}

.project-header {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 24px 32px;
    border-bottom: 1px solid var(--color-border);
}

.project-name {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.3px;
}

.project-badge {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.65rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    background: var(--color-glow);
    border: 1px solid var(--color-border);
    padding: 3px 10px;
    border-radius: 6px;
    font-weight: 500;
}

.project-body {
    padding: 28px 32px;
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 32px;
}

.project-desc p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: 12px;
}

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

.project-why {
    border-left: 1px solid var(--color-border);
    padding-left: 24px;
}

.project-why-label {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    margin-bottom: 8px;
    font-weight: 600;
}

.project-why p {
    font-size: 0.9rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

@media (max-width: 768px) {
    .project-body {
        grid-template-columns: 1fr;
        padding: 24px 20px;
    }

    .project-header {
        padding: 20px;
    }

    .project-why {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--color-border);
        padding-top: 16px;
    }
}

/* --- Off-stage --- */
.offstage-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 56px;
}

.offstage-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 32px;
    transition: border-color 0.3s, transform 0.3s, background 0.4s;
}

.offstage-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
}

.offstage-icon {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: var(--color-glow);
    border: 1px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent);
    margin-bottom: 16px;
    transition: background 0.4s;
}

.offstage-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.05rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.offstage-card p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* Media */
.media-block {
    text-align: center;
}

.media-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 8px;
}

.media-soon {
    color: var(--color-text-muted);
    font-size: 0.85rem;
    margin-bottom: 20px;
}

.media-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    max-width: 500px;
    margin: 0 auto;
}

.media-item {
    aspect-ratio: 16/9;
    background: var(--color-surface);
    border: 1px dashed var(--color-border);
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: var(--color-text-muted);
    gap: 8px;
    transition: background 0.4s;
    overflow: hidden;
}

.media-item--thumb {
    border-style: solid;
    text-decoration: none;
    cursor: pointer;
    position: relative;
    padding: 0;
}

.media-thumb-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 11px;
    display: block;
}

.media-thumb-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.3);
    border-radius: 11px;
    transition: background 0.3s;
}

.media-item--thumb:hover .media-thumb-overlay {
    background: rgba(0, 0, 0, 0.15);
}

.media-play-btn {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    transition: transform 0.3s, background 0.3s;
}

.media-item--thumb:hover .media-play-btn {
    transform: scale(1.1);
    background: rgba(255, 255, 255, 0.25);
}

.media-item svg {
    opacity: 0.3;
}

.media-item span {
    font-size: 0.75rem;
    opacity: 0.5;
}

/* --- Contacts --- */
.contacts-lead {
    margin-bottom: 32px;
    margin-top: -24px;
}

.contacts-lead p {
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.contacts-lead p:last-child {
    color: var(--color-text-muted);
    font-style: italic;
}

.contacts-grid {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.contact-link {
    display: flex;
    align-items: center;
    gap: 14px;
    padding: 20px 24px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    flex: 1;
    min-width: 200px;
    color: var(--color-text);
    transition: border-color 0.3s, transform 0.3s, box-shadow 0.3s, background 0.4s;
}

.contact-link:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-2px);
    box-shadow: var(--shadow-card-hover);
    color: var(--color-text);
}

.contact-link svg {
    color: var(--color-accent);
    flex-shrink: 0;
}

.contact-link strong {
    display: block;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.7rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--color-text-muted);
    margin-bottom: 2px;
    font-weight: 500;
}

.contact-link span {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
}

/* --- Footer --- */
.footer {
    text-align: center;
    padding: 32px 24px;
    border-top: 1px solid var(--color-border);
    font-size: 0.78rem;
    color: var(--color-text-muted);
    transition: border-color 0.4s;
}

/* --- Animations --- */
@keyframes scrollPulse {
    0%, 100% { opacity: 0.2; }
    50% { opacity: 0.8; }
}

.hero-content {
    animation: heroReveal 0.9s ease-out;
}

@keyframes heroReveal {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Reveal transitions for cards */
.path-card,
.skill-block {
    transition: opacity 0.6s ease, transform 0.6s ease, border-color 0.3s, box-shadow 0.3s, background 0.4s;
}

/* --- Mobile --- */
.hide-mobile { display: inline; }

@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        flex-direction: column;
        background: var(--nav-bg);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        padding: 20px 36px;
        gap: 16px;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.open {
        display: flex;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-intro {
        flex-direction: column;
        gap: 20px;
    }

    .hero-text {
        text-align: center;
    }

    .hero-name {
        font-size: 2.4rem;
    }

    .hide-mobile {
        display: none;
    }

    .about-layout {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .about-meta {
        border-left: none;
        padding-left: 0;
        border-top: 1px solid var(--color-border);
        padding-top: 16px;
    }

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

    .path-card--featured {
        grid-column: auto;
    }

    .skills-layout {
        grid-template-columns: 1fr;
        gap: 24px;
    }

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

    .contacts-grid {
        flex-direction: column;
    }

    .contact-link {
        min-width: auto;
    }

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

    .section {
        padding: 64px 0;
    }

    .section-header {
        margin-bottom: 32px;
    }

    .avatar-ring {
        width: 100px;
        height: 100px;
    }

    .avatar-inner {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .navbar {
        padding: 0 20px;
    }

    .hero-name {
        font-size: 2rem;
    }

    .section-title {
        font-size: 1.6rem;
    }

    .path-card {
        padding: 20px;
    }
}