/* NexusUI - Fully Responsive Portfolio Styles */

:root {
    --primary-bg: #0a0a0f;
    --secondary-bg: #111118;
    --glass-bg: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.12);
    --neon-cyan: #00d4ff;
    --neon-pink: #ff006e;
    --neon-purple: #8338ec;
    --neon-orange: #fb5607;
    --neon-yellow: #ffbe0b;
    --neon-green: #06ffa5;
    --text-primary: #f5f8ff;
    --text-secondary: #b0b8c8;
    --shadow-glow: 0 0 25px rgba(0, 212, 255, 0.2);
    --transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    --radius: 20px;
    --max-width: 1400px;
    --bp-xs: 320px;
    --bp-sm: 480px;
    --bp-md: 768px;
    --bp-tablet: 1024px;
    --bp-laptop: 1280px;
    --bp-desktop: 1440px;
    --bp-fullhd: 1920px;
}

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

html {
    scroll-behavior: smooth;
    min-height: 100%;
}

body {
    font-family: 'Poppins', sans-serif;
    font-size: clamp(0.95rem, 1vw, 1rem);
    line-height: 1.65;
    color: var(--text-primary);
    background: linear-gradient(135deg, var(--primary-bg), var(--secondary-bg));
    min-height: 100vh;
    overflow-x: hidden;
}

#loading-screen {
    position: fixed;
    inset: 0;
    display: grid;
    place-items: center;
    background: rgba(10, 10, 18, 0.95);
    z-index: 9999;
    transition: opacity 0.5s ease;
}

#loading-screen.hidden {
    opacity: 0;
    pointer-events: none;
}

.loading-content {
    text-align: center;
    color: var(--text-primary);
}

.spinner {
    width: 3rem;
    height: 3rem;
    border: 0.3rem solid rgba(255, 255, 255, 0.14);
    border-top-color: var(--neon-cyan);
    border-radius: 50%;
    margin: 0 auto 1rem;
    animation: spin 1s linear infinite;
}

.loading-text {
    font-size: clamp(1.75rem, 4vw, 2.8rem);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--text-primary);
}

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

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

button,
input,
textarea,
select {
    font: inherit;
}

button {
    border: none;
}

.container {
    width: min(var(--max-width), 100%);
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
}

.section {
    position: relative;
    min-height: calc(100vh - 70px);
    padding: clamp(2rem, 4vw, 4rem) 1rem;
    display: flex;
    align-items: center;
    justify-content: center;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.8rem);
    font-weight: 700;
    margin-bottom: 1.8rem;
    text-align: center;
    background: linear-gradient(135deg, var(--text-primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 50%;
    bottom: -1rem;
    width: 5rem;
    height: 0.25rem;
    border-radius: 999px;
    transform: translateX(-50%);
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
}

.navbar {
    position: sticky;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(10, 10, 18, 0.88);
    backdrop-filter: blur(22px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 1rem;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}

.nav-logo .logo-text {
    font-size: clamp(1.3rem, 2.5vw, 1.8rem);
    font-weight: 700;
    background: linear-gradient(45deg, var(--neon-cyan), var(--neon-pink));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-shadow: 0 0 18px rgba(0, 212, 255, 0.2);
}

.nav-menu {
    display: none;
    width: 100%;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 70px;
    left: 0;
    right: 0;
    background: rgba(8, 8, 18, 0.96);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    max-height: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height 0.35s ease, opacity 0.35s ease;
}

.nav-menu.open {
    display: flex;
    max-height: 480px;
    opacity: 1;
}

.nav-link {
    display: block;
    width: 100%;
    padding: 1rem 1.25rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    font-size: clamp(0.9rem, 1.4vw, 1rem);
    transition: var(--transition);
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    position: relative;
    overflow: hidden;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0.9rem;
    left: 50%;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
    transition: width 0.28s ease, left 0.28s ease;
    border-radius: 999px;
}

.nav-link:last-child {
    border-bottom: none;
}

.nav-link:hover {
    color: var(--neon-cyan);
    background: rgba(255, 255, 255, 0.04);
}

.nav-link:hover::after {
    width: calc(100% - 2.5rem);
    left: 1.25rem;
}

.nav-toggle {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.menu-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 3rem;
    height: 3rem;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    border-radius: 14px;
    cursor: pointer;
    transition: var(--transition);
}

.menu-lines {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 1rem;
    width: 1.4rem;
}

.menu-line {
    width: 100%;
    height: 2px;
    border-radius: 999px;
    background: var(--text-primary);
    transition: var(--transition);
}

.menu-btn.active .menu-line:first-child {
    transform: translateY(5px) rotate(45deg);
}

.menu-btn.active .menu-line:nth-child(2) {
    opacity: 0;
}

.menu-btn.active .menu-line:last-child {
    transform: translateY(-5px) rotate(-45deg);
}

.theme-btn {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
    padding: 0.85rem 1rem;
    border-radius: 999px;
    display: inline-flex;
    align-items: center;
    gap: 0.55rem;
    cursor: pointer;
    transition: var(--transition);
}

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

.home-content {
    display: grid;
    gap: clamp(2rem, 4vw, 3.5rem);
    grid-template-columns: 1fr;
    text-align: center;
    align-items: center;
}

.home-text {
    max-width: 740px;
    margin: 0 auto;
    padding: 0 0.5rem;
}

.home-title {
    font-size: clamp(2rem, 6vw, 3.8rem);
    font-weight: 700;
    line-height: 1.12;
    margin-bottom: 1.2rem;
    background: linear-gradient(135deg, var(--text-primary), var(--neon-cyan));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.home-subtitle {
    font-size: clamp(1rem, 2.2vw, 1.15rem);
    color: var(--text-secondary);
    margin-bottom: 1.8rem;
    max-width: 38rem;
    margin-left: auto;
    margin-right: auto;
}

.home-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 1rem;
    justify-content: center;
    align-items: center;
    margin-top: 1.5rem;
}

.explore-btn,
.youtube-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    max-width: 240px;
    padding: 1rem 1.5rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    box-shadow: var(--shadow-glow);
}

.explore-btn {
    color: var(--primary-bg);
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-pink));
}

.youtube-btn {
    color: #ffffff;
    background: #ff0000;
    border: 1px solid rgba(255, 255, 255, 0.16);
}

.explore-btn:hover,
.youtube-btn:hover {
    transform: translateY(-3px);
}

.youtube-btn:hover {
    box-shadow: 0 0 24px rgba(255, 0, 0, 0.24);
}

.home-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 320px;
}

.logo-illustration {
    position: relative;
    display: grid;
    place-items: center;
    width: min(90vw, 360px);
    height: min(90vw, 360px);
    margin: 0 auto;
}

.logo-frame {
    position: relative;
    width: 100%;
    height: 100%;
    display: grid;
    place-items: center;
}

.signal-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.12);
}

.ring-1 {
    width: 60%;
    height: 60%;
    border-color: rgba(0, 212, 255, 0.4);
    animation: rotateSlow 18s linear infinite;
}

.ring-2 {
    width: 78%;
    height: 78%;
    border-color: rgba(255, 0, 110, 0.35);
    animation: rotateReverse 24s linear infinite;
}

.ring-3 {
    width: 90%;
    height: 90%;
    border-color: rgba(131, 56, 236, 0.25);
    opacity: 0.6;
}

.logo-core {
    position: relative;
    width: clamp(10rem, 28vw, 14rem);
    height: clamp(10rem, 28vw, 14rem);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 32px;
    backdrop-filter: blur(24px);
    box-shadow: inset 0 0 30px rgba(255, 255, 255, 0.08), 0 0 35px rgba(0, 212, 255, 0.1);
}

.logo-accent {
    width: clamp(3.5rem, 10vw, 4.5rem);
    height: clamp(3.5rem, 10vw, 4.5rem);
    border-radius: 18px;
    overflow: hidden;
    margin-bottom: 0.9rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 0 0 30px rgba(0, 212, 255, 0.15);
}

.logo-accent img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.logo-label {
    font-size: clamp(1rem, 2.2vw, 1.45rem);
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
}

.logo-meta {
    position: absolute;
    bottom: -1.4rem;
    display: flex;
    gap: 0.85rem;
    flex-wrap: wrap;
    justify-content: center;
}

.logo-meta span {
    padding: 0.5rem 0.9rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.16);
    color: var(--text-secondary);
    font-size: 0.8rem;
    letter-spacing: 0.05em;
}

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

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

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-14px); }
}

@keyframes blink {
    0%, 50%, 100% { opacity: 1; }
    25%, 75% { opacity: 0.3; }
}

@keyframes pageFlash {
    0% { opacity: 0; }
    20% { opacity: 0.8; }
    100% { opacity: 0; }
}

body.page-flash::before {
    content: '';
    position: fixed;
    inset: 0;
    background: rgba(255, 255, 255, 0.75);
    pointer-events: none;
    animation: pageFlash 0.5s ease-out forwards;
    z-index: 9999;
}

.reveal {
    opacity: 0;
    transform: translateY(25px);
    transition: var(--transition);
}

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

.about-content {
    max-width: 960px;
    width: 100%;
    margin: 0 auto;
}

.about-description {
    color: var(--text-secondary);
    font-size: clamp(1rem, 2vw, 1.1rem);
    line-height: 1.8;
    margin-bottom: 2.2rem;
    max-width: 60rem;
    margin-left: auto;
    margin-right: auto;
}

.skills-list {
    display: grid;
    gap: 1rem;
}

.skill-item {
    padding: 1.2rem 1.1rem;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(14px);
}

.skill-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.85rem;
    flex-wrap: wrap;
}

.skill-name {
    font-weight: 700;
    letter-spacing: 0.02em;
}

.skill-percent {
    color: var(--neon-cyan);
    font-weight: 700;
}

.skill-bar {
    width: 100%;
    height: 0.75rem;
    border-radius: 999px;
    background: rgba(255, 255, 255, 0.08);
    overflow: hidden;
}

.skill-fill {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, var(--neon-cyan), var(--neon-pink));
}

.videos-grid,
.playlist-grid {
    display: grid;
    gap: 1.25rem;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    margin-top: 2.2rem;
}

.video-card,
.playlist-card {
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100%;
    border-radius: 1.25rem;
    overflow: hidden;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(18px);
    transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
    text-decoration: none;
}

.playlist-card {
    text-decoration: none;
}

.video-thumbnail,
.playlist-thumbnail {
    position: relative;
    min-height: 200px;
    overflow: hidden;
}

.video-thumbnail img,
.playlist-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.video-card:hover .video-thumbnail img,
.playlist-card:hover .playlist-thumbnail img {
    transform: scale(1.02);
}

.play-overlay {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-primary);
    font-size: clamp(2rem, 4vw, 3rem);
    background: rgba(0, 0, 0, 0.35);
    transition: background 0.3s ease;
}

.video-card:hover .play-overlay {
    background: rgba(0, 212, 255, 0.35);
}

.video-title,
.playlist-title {
    margin: 1.25rem 1.25rem 0.75rem;
    font-size: clamp(1.1rem, 2vw, 1.25rem);
    font-weight: 600;
    color: var(--text-primary);
}

.video-description,
.playlist-description {
    margin: 0 1.25rem 1.5rem;
    color: var(--text-secondary);
    line-height: 1.75;
    font-size: clamp(0.95rem, 1.6vw, 1rem);
}

.playlist-count {
    position: absolute;
    top: 0.85rem;
    right: 0.85rem;
    padding: 0.45rem 0.85rem;
    border-radius: 999px;
    background: rgba(0, 0, 0, 0.75);
    color: var(--text-primary);
    font-size: 0.78rem;
}

.contact-content {
    width: 100%;
    max-width: 1000px;
    margin: 0 auto;
}

.contact-form {
    display: grid;
    gap: 1rem;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 1.5rem;
    padding: 1.5rem;
    backdrop-filter: blur(18px);
}

.form-group {
    width: 100%;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.1rem;
    border-radius: 1rem;
    border: 1px solid rgba(255, 255, 255, 0.12);
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-primary);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--neon-cyan);
    box-shadow: 0 0 25px rgba(0, 212, 255, 0.12);
}

.form-group textarea {
    min-height: 10rem;
    resize: vertical;
    resize: none;
}

.submit-btn {
    width: 100%;
    padding: 1rem 1.25rem;
    border-radius: 999px;
    font-size: clamp(1rem, 1.8vw, 1.1rem);
    font-weight: 600;
    background: linear-gradient(135deg, var(--neon-cyan), var(--neon-pink));
    color: var(--primary-bg);
    cursor: pointer;
    transition: var(--transition);
}

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

.footer {
    padding: clamp(2rem, 4vw, 3rem) 1rem;
    background: rgba(10, 10, 18, 0.9);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-content {
    display: grid;
    gap: 1rem;
    justify-items: center;
}

.footer-name {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
}

.social-icons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.9rem;
    justify-content: center;
}

.social-icon {
    position: relative;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
    transition: var(--transition);
}

.social-icon svg {
    width: 1.2rem;
    height: 1.2rem;
    fill: currentColor;
}

.social-icon[data-platform="YouTube"] {
    background: #FF0000;
    color: #FFFFFF;
    border-color: #FF4C4C;
}

.social-icon[data-platform="LinkedIn"] {
    background: #0A66C2;
    color: #FFFFFF;
    border-color: #2D78E5;
}

.social-icon[data-platform="Facebook"] {
    background: #1877F2;
    color: #FFFFFF;
    border-color: #3B82F6;
}

.social-icon[data-platform="Instagram"] {
    background: radial-gradient(circle at 30% 30%, #fdf497 0%, #fdf497 5%, #fd5949 45%, #d6249f 60%, #285AEB 90%);
    color: #FFFFFF;
    border-color: transparent;
}

.social-icon[data-platform="Threads"] {
    background: #000000;
    color: #FFFFFF;
    border-color: #4F4F4F;
}

.social-icon[data-platform="X"] {
    background: #1DA1F2;
    color: #FFFFFF;
    border-color: #4CB3FF;
}

.social-icon[data-platform="TikTok"] {
    background: #010101;
    color: #FFFFFF;
    border-color: #343434;
}

.social-icon[data-platform="Telegram"] {
    background: #26A5E4;
    color: #FFFFFF;
    border-color: #58BAEE;
}

.social-icon:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: var(--shadow-glow);
    border-color: var(--neon-cyan);
}

.social-icon::after {
    content: attr(data-platform);
    position: absolute;
    top: -2.4rem;
    left: 50%;
    transform: translateX(-50%) translateY(0.75rem);
    opacity: 0;
    pointer-events: none;
    padding: 0.45rem 0.75rem;
    border-radius: 999px;
    background: rgba(10, 10, 20, 0.95);
    color: #ffffff;
    font-size: 0.7rem;
    white-space: nowrap;
    transition: opacity 0.2s ease, transform 0.2s ease;
}

.social-icon:hover::after {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}

.footer-copyright {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-align: center;
}

.back-to-top {
    position: fixed;
    bottom: 1.25rem;
    right: 1.25rem;
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.12);
    color: var(--text-primary);
    display: grid;
    place-items: center;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

@media (min-width: 769px) {
    .nav-menu {
        display: flex;
        position: static;
        flex-direction: row;
        justify-content: center;
        align-items: center;
        width: auto;
        max-height: none;
        opacity: 1;
        background: transparent;
        border-bottom: none;
    }

    .nav-link {
        border: none;
        width: auto;
        padding: 0.75rem 0.9rem;
    }

    .menu-btn {
        display: none;
    }

    .theme-btn {
        min-width: auto;
    }

    .section {
        padding: clamp(3rem, 4vw, 4.5rem) 1.5rem;
    }

    .home-content {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        text-align: left;
    }

    .home-subtitle {
        margin-left: 0;
        margin-right: 0;
    }

    .home-actions {
        display: flex;
        justify-content: flex-start;
        gap: 1rem;
    }

    .home-visual {
        justify-content: flex-end;
    }

    .videos-grid,
    .playlist-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }

    .video-thumbnail,
    .playlist-thumbnail {
        min-height: 220px;
    }

    .contact-form {
        gap: 1.25rem;
    }

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

@media (min-width: 1025px) {
    .nav-container {
        padding: 0 2rem;
    }

    .home-content {
        gap: 4rem;
    }

    .logo-frame {
        width: min(100%, 360px);
        height: min(100%, 360px);
    }

    .videos-grid,
    .playlist-grid {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .video-thumbnail,
    .playlist-thumbnail {
        min-height: 250px;
    }

    .contact-form {
        grid-template-columns: 1fr;
    }
}

@media (min-width: 1281px) {
    .nav-container {
        padding: 0 2.5rem;
    }

    .section {
        padding: clamp(3rem, 3vw, 6rem) 2rem;
    }

    .home-content {
        gap: 4.5rem;
    }

    .home-title {
        font-size: clamp(3.2rem, 5vw, 4.2rem);
    }

    .video-thumbnail,
    .playlist-thumbnail {
        min-height: 270px;
    }
}

@media (min-width: 1441px) {
    .section {
        padding: 5rem 2.5rem;
    }

    .nav-container {
        padding: 0 3rem;
    }
}

@media (min-width: 1921px) {
    .section {
        padding: 6rem 3.5rem;
    }
}

@media (max-width: 1024px) {
    .home-actions {
        justify-content: center;
    }
}

@media (max-width: 900px) {
    .section {
        padding: 2rem 1rem;
        min-height: auto;
    }

    .nav-container {
        padding: 0 0.85rem;
    }

    .home-content {
        gap: 1.75rem;
    }

    .home-actions {
        display: grid;
        grid-template-columns: 1fr;
        justify-items: center;
        gap: 0.85rem;
    }

    .video-thumbnail,
    .playlist-thumbnail {
        min-height: 180px;
    }

    .footer-content {
        flex-direction: column;
        gap: 1rem;
    }
}

@media (max-width: 640px) {
    .section {
        padding: 1.5rem 0.75rem;
        min-height: auto;
    }

    .home-actions {
        grid-template-columns: 1fr;
        justify-items: center;
        gap: 0.85rem;
    }

    .home-title {
        font-size: clamp(2rem, 8vw, 3rem);
    }

    .home-subtitle {
        font-size: 1rem;
    }

    .videos-grid,
    .playlist-grid {
        gap: 1rem;
    }
}

body.light-mode {
    background: linear-gradient(135deg, #f4f7fb, #ffffff);
    color: #111827;
}

body.light-mode .navbar {
    background: rgba(255, 255, 255, 0.92);
    border-color: rgba(0, 0, 0, 0.08);
}

body.light-mode .nav-menu {
    background: rgba(255, 255, 255, 0.96);
}

body.light-mode .nav-link {
    color: #111827;
}

body.light-mode .nav-link:hover {
    color: #0b73ff;
    background: rgba(0, 119, 255, 0.08);
}

body.light-mode .menu-line {
    background: #111827;
}

body.light-mode .theme-btn {
    background: rgba(255, 255, 255, 0.96);
    color: #111827;
    border-color: rgba(0, 0, 0, 0.08);
}

body.light-mode .section {
    background: transparent;
}

body.light-mode .contact-form,
body.light-mode .video-card,
body.light-mode .playlist-card,
body.light-mode .skill-item,
body.light-mode .footer,
body.light-mode .back-to-top,
body.light-mode .menu-btn,
body.light-mode .theme-btn {
    background: rgba(255, 255, 255, 0.9);
    border-color: rgba(0, 0, 0, 0.08);
    color: #111827;
}

body.light-mode .home-title,
body.light-mode .section-title,
body.light-mode .footer-name,
body.light-mode .video-title,
body.light-mode .playlist-title,
body.light-mode .skill-name {
    color: #111827;
}

body.light-mode .home-title {
    background: linear-gradient(135deg, #111827, #0b73ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

body.light-mode .home-subtitle {
    color: #475569;
}

body.light-mode .about-description,
body.light-mode .video-description,
body.light-mode .playlist-description,
body.light-mode .footer-copyright {
    color: #4b5563;
}

body.light-mode .social-icon::after {
    background: rgba(15, 23, 42, 0.94);
    color: #ffffff;
}

body.light-mode .form-group input,
body.light-mode .form-group select,
body.light-mode .form-group textarea {
    background: rgba(255, 255, 255, 0.96);
    border-color: rgba(0, 0, 0, 0.1);
    color: #111827;
}

body.light-mode .form-group input::placeholder,
body.light-mode .form-group textarea::placeholder {
    color: #6b7280;
}

body.light-mode .play-overlay {
    background: rgba(0, 0, 0, 0.35);
    color: var(--text-primary);
}

@media (hover: none) {
    .video-card:hover,
    .playlist-card:hover,
    .social-icon:hover,
    .theme-btn:hover,
    .explore-btn:hover,
    .submit-btn:hover,
    .back-to-top:hover {
        transform: none;
        box-shadow: none;
    }
}