:root {
    --bg: #0f172a;
    --bg-elevated: #111827;
    --bg-soft: #1f2937;
    --accent: #3b82f6;
    --accent-soft: rgba(59, 130, 246, 0.15);
    --accent-strong: #2563eb;
    --text: #e5e7eb;
    --text-soft: #9ca3af;
    --border-subtle: #1f2937;
    --radius-lg: 14px;
    --radius-md: 10px;
    --radius-pill: 999px;
    --shadow-soft: 0 18px 45px rgba(15, 23, 42, 0.6);
    --shadow-subtle: 0 8px 24px rgba(15, 23, 42, 0.5);
}

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

body {
    margin: 0;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background: radial-gradient(circle at top left, #1d2537 0, #020617 55%);
    color: var(--text);
}

a {
    color: inherit;
    text-decoration: none;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(18px);
    background: linear-gradient(to bottom, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.75));
    border-bottom: 1px solid rgba(31, 41, 55, 0.9);
}

.header-inner {
    max-width: 1120px;
    margin: 0 auto;
    padding: 10px 20px;
    display: flex;
    align-items: center;
    gap: 14px;
}

.logo {
    font-size: 20px;
    font-weight: 800;
    letter-spacing: 0.04em;
    padding: 6px 14px;
    border-radius: 999px;
    background: radial-gradient(circle at 0 0, #4f46e5, #1d4ed8);
    box-shadow: 0 14px 30px rgba(59, 130, 246, 0.55);
}

.search-bar {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 6px 10px;
    border-radius: 999px;
    background: radial-gradient(circle at top left, #020617, #020617 55%);
    border: 1px solid rgba(31, 41, 55, 0.92);
}

.search-bar input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    color: var(--text);
    font-size: 14px;
}

.search-bar button {
    border-radius: 999px;
    border: none;
    padding: 6px 14px;
    background: var(--accent-soft);
    color: var(--accent);
    font-size: 13px;
    cursor: pointer;
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
}

.header-nav a {
    padding: 6px 10px;
    border-radius: 999px;
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-soft);
}

.header-nav a:hover {
    background: rgba(31, 41, 55, 0.9);
    color: var(--text);
}

.btn-upload {
    background: linear-gradient(135deg, #22c55e, #22c55e);
    color: #022c22;
    font-weight: 600;
    border-radius: 999px;
    padding-inline: 14px;
    box-shadow: 0 16px 30px rgba(22, 163, 74, 0.48);
}

.btn-upload:hover {
    filter: brightness(1.05);
}

.site-main {
    max-width: 1120px;
    margin: 0 auto;
    padding: 18px 20px 32px;
}

.hero {
    display: flex;
    gap: 16px;
    padding: 18px 18px 20px;
    border-radius: 20px;
    background: radial-gradient(circle at top left, #111827 0, #020617 55%);
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(31, 41, 55, 0.9);
    margin-bottom: 20px;
}

.hero-text h1 {
    margin: 0 0 6px;
    font-size: 26px;
}

.hero-text p {
    margin: 0;
    font-size: 14px;
    color: var(--text-soft);
}

.video-grid-section {
    margin-top: 8px;
}

.section-header h2 {
    margin: 0 0 10px;
    font-size: 18px;
}

.section-filter {
    margin-left: auto;
}

.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 14px;
}

.video-card {
    display: block;
    border-radius: 16px;
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.9), rgba(15, 23, 42, 0.98));
    border: 1px solid rgba(31, 41, 55, 0.95);
    box-shadow: var(--shadow-subtle);
    overflow: hidden;
    transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.video-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 20px 40px rgba(15, 23, 42, 0.8);
    border-color: rgba(59, 130, 246, 0.65);
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 1));
}

.video-thumb {
    position: relative;
    padding-top: 56.25%;
}

.video-thumb-placeholder {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: radial-gradient(circle at 30% 30%, rgba(59, 130, 246, 0.55), rgba(15, 23, 42, 0.95));
}

.video-thumb-placeholder span {
    font-size: 18px;
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: rgba(226, 232, 240, 0.9);
}

.video-info {
    padding: 10px 11px 11px;
}

.video-title {
    margin: 0 0 6px;
    font-size: 14px;
    line-height: 1.3;
}

.video-meta {
    font-size: 12px;
    color: var(--text-soft);
}

.empty-tip {
    color: var(--text-soft);
    font-size: 14px;
}

.user-pill {
    padding: 4px 10px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(31, 41, 55, 0.9);
    font-size: 13px;
    color: var(--text-soft);
}

.site-footer {
    border-top: 1px solid rgba(31, 41, 55, 0.9);
    padding: 14px 20px 18px;
    text-align: center;
    color: var(--text-soft);
    font-size: 12px;
    background: linear-gradient(to top, rgba(2, 6, 23, 0.95), transparent);
}

.upload-page {
    display: flex;
    justify-content: center;
}

.upload-card {
    width: 100%;
    max-width: 520px;
    margin-top: 24px;
    padding: 22px 22px 20px;
    border-radius: 20px;
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.95), rgba(15, 23, 42, 0.98));
    border: 1px solid rgba(31, 41, 55, 0.95);
    box-shadow: var(--shadow-soft);
}

.upload-card h1 {
    margin: 0 0 14px;
    font-size: 20px;
}

.form-group {
    margin-bottom: 12px;
    font-size: 14px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 8px 10px;
    border-radius: 10px;
    border: 1px solid rgba(31, 41, 55, 0.95);
    background: #020617;
    color: var(--text);
    outline: none;
    font-size: 14px;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 1px rgba(59, 130, 246, 0.4);
}

.form-actions {
    margin-top: 14px;
    display: flex;
    gap: 8px;
}

.btn-primary,
.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 7px 14px;
    border-radius: 999px;
    font-size: 14px;
    border: none;
    cursor: pointer;
}

.btn-primary {
    background: linear-gradient(135deg, #3b82f6, #2563eb);
    color: #e5e7eb;
    box-shadow: 0 16px 34px rgba(37, 99, 235, 0.6);
}

.btn-secondary {
    background: rgba(15, 23, 42, 0.9);
    color: var(--text-soft);
    border: 1px solid rgba(31, 41, 55, 0.95);
}

.btn-primary:hover,
.btn-secondary:hover {
    filter: brightness(1.04);
}

.alert {
    padding: 8px 10px;
    border-radius: 10px;
    font-size: 13px;
    margin-bottom: 12px;
}

.alert-error {
    background: rgba(248, 113, 113, 0.15);
    border: 1px solid rgba(248, 113, 113, 0.5);
    color: #fecaca;
}

.video-page {
    margin-top: 14px;
}

.video-main {
    display: grid;
    grid-template-columns: minmax(0, 2.1fr) minmax(0, 1.2fr);
    gap: 18px;
}

.video-category {
    margin-left: 6px;
    padding: 2px 8px;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(31, 41, 55, 0.95);
}

.video-views {
    margin-left: 6px;
    color: var(--text-soft);
}

.video-actions {
    margin: 8px 0 10px;
}

.inline-form {
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.btn-like {
    border-radius: 999px;
    border: 1px solid rgba(37, 99, 235, 0.8);
    padding: 4px 12px;
    background: rgba(37, 99, 235, 0.16);
    color: #bfdbfe;
    font-size: 13px;
    cursor: pointer;
}

.btn-like[disabled] {
    opacity: 0.6;
    cursor: not-allowed;
}

.hint-text {
    font-size: 12px;
    color: var(--text-soft);
}

.comments {
    margin-top: 22px;
    padding: 14px 16px 16px;
    border-radius: 18px;
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.97), rgba(15, 23, 42, 1));
    border: 1px solid rgba(31, 41, 55, 0.95);
    box-shadow: var(--shadow-subtle);
}

.comments-title {
    margin: 0 0 10px;
    font-size: 16px;
}

.comment-form .form-group textarea {
    min-height: 70px;
}

.comment-list {
    list-style: none;
    padding: 0;
    margin: 14px 0 0;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.comment-item {
    padding: 8px 10px;
    border-radius: 12px;
    background: rgba(15, 23, 42, 0.9);
    border: 1px solid rgba(31, 41, 55, 0.95);
}

.comment-header {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-soft);
    margin-bottom: 4px;
}

.comment-body {
    font-size: 14px;
}

.profile-page .profile-header {
    display: flex;
    align-items: center;
    gap: 14px;
    margin-bottom: 18px;
}

.profile-avatar {
    width: 52px;
    height: 52px;
    border-radius: 999px;
    background: radial-gradient(circle at top left, #3b82f6, #1d4ed8);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 26px;
    font-weight: 700;
    color: #e5e7eb;
}

.profile-info h1 {
    margin: 0 0 4px;
    font-size: 20px;
}

.profile-meta {
    margin: 0;
    font-size: 13px;
    color: var(--text-soft);
}

.profile-page .video-grid-section {
    margin-top: 16px;
}

.history-page .video-grid-section,
.favorites-page .video-grid-section {
    margin-top: 4px;
}

.up-link {
    color: #93c5fd;
}

.user-link {
    display: inline-flex;
}

.video-player-wrapper {
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow-soft);
    border: 1px solid rgba(31, 41, 55, 0.95);
}

.video-player {
    width: 100%;
    height: auto;
    display: block;
    background: #000;
}

.video-detail {
    padding: 14px 16px;
    border-radius: 18px;
    background: radial-gradient(circle at top left, rgba(15, 23, 42, 0.97), rgba(15, 23, 42, 1));
    border: 1px solid rgba(31, 41, 55, 0.95);
    box-shadow: var(--shadow-subtle);
}

.video-detail .video-title {
    margin: 0 0 8px;
    font-size: 20px;
}

.video-detail .video-meta {
    font-size: 13px;
    color: var(--text-soft);
    margin-bottom: 10px;
}

.video-description {
    margin: 0;
    font-size: 14px;
    color: var(--text);
}

.video-not-found {
    text-align: center;
    margin-top: 50px;
}

@media (max-width: 768px) {
    .header-inner {
        flex-wrap: wrap;
        gap: 8px;
    }

    .video-main {
        grid-template-columns: minmax(0, 1fr);
    }
}