:root {
    --bg-main: #020617;
    --bg-panel: #0f172a;
    --bg-card: rgba(15, 23, 42, 0.86);
    --bg-card-hover: rgba(30, 41, 59, 0.95);

    --text-main: #f8fafc;
    --text-muted: #94a3b8;

    --accent: #38bdf8;
    --accent-2: #a78bfa;
    --accent-3: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;

    --border-soft: rgba(148, 163, 184, 0.18);
    --shadow-soft: 0 20px 45px rgba(0, 0, 0, 0.35);
    --radius-xl: 22px;
    --radius-lg: 16px;
    --radius-md: 12px;
}

* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    margin: 0;
    min-height: 100vh;
    font-family: Inter, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.18), transparent 32%),
        radial-gradient(circle at top right, rgba(167, 139, 250, 0.16), transparent 30%),
        linear-gradient(135deg, #020617 0%, #0f172a 52%, #111827 100%);
    color: var(--text-main);
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    pointer-events: none;
    background-image:
        linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
    background-size: 44px 44px;
    mask-image: linear-gradient(to bottom, rgba(0,0,0,0.5), transparent 75%);
    z-index: -1;
}

.container {
    width: min(1180px, calc(100% - 32px));
    margin: 0 auto;
    padding: 28px 0 60px;
}

h1, h2, h3, h4 {
    letter-spacing: -0.03em;
}

h1 {
    font-size: clamp(2.2rem, 5vw, 4.5rem);
    line-height: 1;
    margin: 18px 0 14px;
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2.3rem);
}

h3 {
    font-size: 1.1rem;
}

p {
    color: var(--text-muted);
    line-height: 1.65;
}

.subtitle {
    color: var(--text-muted);
    font-size: 1.05rem;
    max-width: 760px;
    margin: 8px auto 18px;
    text-align: center;
}

.card,
.meta-card,
.preview-card,
.opening-info-card,
.onboarding-card,
.continue-learning-card {
    background: linear-gradient(180deg, rgba(15, 23, 42, 0.92), rgba(15, 23, 42, 0.72));
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-lg);
    padding: 20px;
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(14px);
    transition: transform 0.22s ease, border-color 0.22s ease, background 0.22s ease;
}

.card:hover,
.meta-card:hover,
.preview-card:hover,
.opening-info-card:hover,
.onboarding-card:hover,
.continue-learning-card:hover {
    transform: translateY(-4px);
    border-color: rgba(56, 189, 248, 0.38);
    background: var(--bg-card-hover);
}

button,
.learn-btn,
.back-btn {
    border: 0;
    cursor: pointer;
    border-radius: 999px;
    padding: 11px 18px;
    font-weight: 700;
    color: #020617;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    box-shadow: 0 12px 28px rgba(56, 189, 248, 0.22);
    transition: transform 0.18s ease, box-shadow 0.18s ease, filter 0.18s ease;
}

button:hover,
.learn-btn:hover,
.back-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.08);
    box-shadow: 0 18px 35px rgba(56, 189, 248, 0.32);
}

button:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

input,
select {
    background: rgba(15, 23, 42, 0.92);
    color: var(--text-main);
    border: 1px solid var(--border-soft);
    border-radius: 14px;
    padding: 12px 14px;
    outline: none;
    transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

input:focus,
select:focus {
    border-color: rgba(56, 189, 248, 0.75);
    box-shadow: 0 0 0 4px rgba(56, 189, 248, 0.12);
}

.section-title {
    margin-top: 34px;
    margin-bottom: 18px;
    text-align: center;
}

.back-btn {
    background: rgba(15, 23, 42, 0.82);
    color: var(--text-main);
    border: 1px solid var(--border-soft);
    box-shadow: none;
    margin-right: 10px;
}

.home-hero {
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 1180px;
    margin: 28px auto 34px;
    padding: clamp(32px, 6vw, 72px);
    text-align: center;
    border-radius: 30px;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at 20% 10%, rgba(56, 189, 248, 0.25), transparent 32%),
        radial-gradient(circle at 80% 20%, rgba(167, 139, 250, 0.22), transparent 32%),
        linear-gradient(135deg, rgba(15, 23, 42, 0.95), rgba(2, 6, 23, 0.95));
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.42);
}

.home-hero::after {
    content: "♞";
    position: absolute;
    right: 42px;
    bottom: -44px;
    font-size: 12rem;
    opacity: 0.055;
    transform: rotate(-10deg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 14px;
    margin-bottom: 18px;
    border-radius: 999px;
    color: #bae6fd;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.26);
    font-size: 0.9rem;
    font-weight: 700;
}

.home-hero h1 {
    max-width: 900px;
    margin: 0 auto 18px;
}

.home-hero p {
    max-width: 720px;
    margin: 0 auto 26px;
    font-size: 1.08rem;
}

.home-hero-actions {
    display: flex;
    justify-content: center;
    gap: 14px;
    flex-wrap: wrap;
}

.secondary-btn {
    background: rgba(15, 23, 42, 0.75);
    color: var(--text-main);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.finder-hero {
    width: 100%;
    max-width: 920px;
    margin: 38px auto 30px;
    padding: 38px;
    text-align: center;
    border-radius: 28px;
    background:
        radial-gradient(circle at top left, rgba(34, 197, 94, 0.16), transparent 36%),
        linear-gradient(145deg, rgba(15, 23, 42, 0.94), rgba(2, 6, 23, 0.94));
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-soft);
}

.finder-hero h1 {
    margin-top: 0;
}

.finder-input {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-top: 22px;
    flex-wrap: wrap;
}

.finder-input input {
    min-width: 240px;
    font-size: 1rem;
}

.results-container {
    margin-top: 30px;
}

.results-row {
    display: grid;
    grid-template-columns: 0.9fr 1.3fr;
    gap: 20px;
    align-items: start;
}

.results-col {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#recommendations {
    display: grid;
    grid-template-columns: 1fr;
    gap: 16px;
}

.avoid-row {
    margin-top: 24px;
}

#avoidOpenings {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.ai-insight {
    border-color: rgba(167, 139, 250, 0.28);
}

@media (max-width: 900px) {
    .results-row {
        grid-template-columns: 1fr;
    }

    #avoidOpenings {
        grid-template-columns: 1fr;
    }
}

.home-grid,
.library-grid,
#openingsContainer,
#relatedOpenings {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
}

.opening-card,
.library-card {
    position: relative;
    overflow: hidden;
}

.opening-card::before,
.library-card::before,
.card::before {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), transparent 35%);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.22s ease;
}

.opening-card:hover::before,
.library-card:hover::before,
.card:hover::before {
    opacity: 1;
}

@media (max-width: 1000px) {
    .home-grid,
    .library-grid,
    #openingsContainer,
    #relatedOpenings {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 650px) {
    .home-grid,
    .library-grid,
    #openingsContainer,
    #relatedOpenings {
        grid-template-columns: 1fr;
    }
}

.board-section {
    display: grid;
    grid-template-columns: minmax(320px, 480px) 1fr;
    gap: 22px;
    align-items: start;
    margin-top: 28px;
}

#board {
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 24px 55px rgba(0, 0, 0, 0.38);
    border: 1px solid var(--border-soft);
}

.move-controls,
.practice-controls,
.opening-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 16px;
}

.study-status,
.practice-box,
.move-list {
    background: rgba(15, 23, 42, 0.74);
    border: 1px solid var(--border-soft);
    border-radius: var(--radius-lg);
    padding: 18px;
    box-shadow: var(--shadow-soft);
}

.practice-box {
    margin-top: 20px;
}

.practice-score {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin: 16px 0;
}

.practice-score p {
    margin: 0;
    padding: 12px;
    border-radius: 14px;
    background: rgba(2, 6, 23, 0.42);
    border: 1px solid var(--border-soft);
    text-align: center;
}

.practice-input-group {
    display: flex;
    gap: 10px;
    margin-top: 14px;
}

.practice-input-group input {
    flex: 1;
}

.practice-status {
    padding: 12px 14px;
    border-radius: 14px;
    background: rgba(2, 6, 23, 0.45);
    border: 1px solid var(--border-soft);
}

.success-status {
    color: #86efac;
    border-color: rgba(34, 197, 94, 0.35);
}

.error-status {
    color: #fca5a5;
    border-color: rgba(239, 68, 68, 0.35);
}

.info-status {
    color: #93c5fd;
    border-color: rgba(59, 130, 246, 0.35);
}

.complete-status {
    color: #c4b5fd;
    border-color: rgba(167, 139, 250, 0.4);
}

.move-table {
    display: grid;
    gap: 6px;
}

.move-row {
    display: grid;
    grid-template-columns: 50px 1fr 1fr;
    gap: 8px;
    align-items: center;
}

.move-row > div {
    padding: 9px 10px;
    border-radius: 10px;
    background: rgba(2, 6, 23, 0.38);
}

.move-header > div {
    color: var(--text-muted);
    font-weight: 700;
}

.move-cell {
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease;
}

.move-cell:hover {
    background: rgba(56, 189, 248, 0.14);
    color: #e0f2fe;
}

.active-move {
    background: rgba(56, 189, 248, 0.22) !important;
    color: #bae6fd;
}

@media (max-width: 950px) {
    .board-section {
        grid-template-columns: 1fr;
    }

    #board {
        width: min(100%, 450px) !important;
        margin: 0 auto;
    }
}

@media (max-width: 550px) {
    .practice-score {
        grid-template-columns: 1fr;
    }

    .practice-input-group {
        flex-direction: column;
    }
}

.opening-meta {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 14px;
    margin: 22px 0;
}

.meta-card {
    text-align: center;
    padding: 16px;
}

.meta-card h3 {
    color: var(--text-muted);
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    margin: 0 0 8px;
}

.meta-card p {
    margin: 0;
    color: var(--text-main);
    font-weight: 800;
}

.opening-preview,
.opening-info,
.opening-actions {
    margin: 18px 0;
}

@media (max-width: 900px) {
    .opening-meta {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 520px) {
    .opening-meta {
        grid-template-columns: 1fr;
    }
}

.badge-row,
.pill-row {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 12px 0;
}

.badge,
.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.78rem;
    font-weight: 800;
    color: #dbeafe;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.22);
}

.badge.eco {
    color: #bae6fd;
    background: rgba(14, 165, 233, 0.12);
    border-color: rgba(14, 165, 233, 0.28);
}

.badge.level {
    color: #c4b5fd;
    background: rgba(167, 139, 250, 0.12);
    border-color: rgba(167, 139, 250, 0.28);
}

.badge.style {
    color: #bbf7d0;
    background: rgba(34, 197, 94, 0.12);
    border-color: rgba(34, 197, 94, 0.28);
}

.badge.color {
    color: #fde68a;
    background: rgba(245, 158, 11, 0.12);
    border-color: rgba(245, 158, 11, 0.28);
}

.card-description {
    margin: 12px 0 16px;
    color: var(--text-muted);
    font-size: 0.94rem;
}

.card-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 12px;
    margin-top: 16px;
}

.card-footer button {
    white-space: nowrap;
}

.muted-small {
    color: var(--text-muted);
    font-size: 0.82rem;
    line-height: 1.4;
}

.glow-text {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.filter-panel {
    width: 100%;
    margin: 28px 0;
    padding: 22px;
    border-radius: 24px;
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 32%),
        rgba(15, 23, 42, 0.78);
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(16px);
}

.filter-header {
    display: flex;
    justify-content: space-between;
    align-items: end;
    gap: 16px;
    margin-bottom: 18px;
}

.filter-header h2 {
    margin: 0 0 6px;
}

.filter-header p {
    margin: 0;
}

.filter-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 12px;
}

.filter-grid input,
.filter-grid select {
    width: 100%;
}

@media (max-width: 950px) {
    .filter-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .filter-grid {
        grid-template-columns: 1fr;
    }
}

.stat-card,
.overview-card {
    position: relative;
    overflow: hidden;
    padding: 20px;
    border-radius: 20px;
    background:
        linear-gradient(180deg, rgba(15, 23, 42, 0.94), rgba(15, 23, 42, 0.7));
    border: 1px solid var(--border-soft);
    box-shadow: var(--shadow-soft);
}

.stat-card::after,
.overview-card::after {
    content: "";
    position: absolute;
    right: -28px;
    bottom: -28px;
    width: 90px;
    height: 90px;
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.12);
}

.stat-card h3,
.overview-card h3 {
    margin: 0 0 8px;
    color: var(--text-muted);
    font-size: 0.82rem;
    text-transform: uppercase;
    letter-spacing: 0.08em;
}

.stat-card p,
.overview-card p {
    margin: 0;
    color: var(--text-main);
    font-size: 1.7rem;
    font-weight: 900;
}

.loading-card {
    text-align: center;
}

.loader {
    width: 34px;
    height: 34px;
    margin: 4px auto 14px;
    border-radius: 999px;
    border: 3px solid rgba(148, 163, 184, 0.2);
    border-top-color: var(--accent);
    animation: spin 0.85s linear infinite;
}

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

.home-hero,
.finder-hero,
.filter-panel,
.card {
    animation: fadeUp 0.45s ease both;
}

@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(14px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: #020617;
}

::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.35);
    border-radius: 999px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(56, 189, 248, 0.45);
}

.brand-bar {
    position: sticky;
    top: 16px;
    z-index: 50;
    width: 100%;
    max-width: 1180px;
    margin: 0 auto 28px;
    padding: 12px 14px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    border: 1px solid var(--border-soft);
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.72);
    backdrop-filter: blur(18px);
    box-shadow: 0 18px 44px rgba(0, 0, 0, 0.28);
}

.brand-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    font-weight: 950;
    letter-spacing: -0.04em;
    font-size: 1.18rem;
    cursor: pointer;
    background: linear-gradient(135deg, #f8fafc, #7dd3fc, #c4b5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.brand-links button {
    padding: 8px 13px;
    background: transparent;
    color: var(--text-muted);
    border: 1px solid transparent;
    box-shadow: none;
    font-size: 0.9rem;
}

.brand-links button:hover {
    color: var(--text-main);
    border-color: var(--border-soft);
    background: rgba(255, 255, 255, 0.055);
}

.brand-links button.active-nav {
    color: #020617;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    border-color: transparent;
}

@media (max-width: 700px) {
    .brand-bar {
        position: relative;
        top: 0;
        border-radius: 24px;
        flex-direction: column;
    }

    .brand-links {
        justify-content: center;
    }
}

.page-hero {
    position: relative;
    overflow: hidden;
    width: 100%;
    max-width: 1180px;
    margin: 26px auto 28px;
    padding: clamp(28px, 5vw, 56px);
    border-radius: 30px;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at 18% 10%, rgba(56, 189, 248, 0.2), transparent 30%),
        radial-gradient(circle at 82% 20%, rgba(167, 139, 250, 0.18), transparent 32%),
        linear-gradient(135deg, rgba(15, 23, 42, 0.94), rgba(2, 6, 23, 0.94));
    box-shadow: 0 28px 70px rgba(0, 0, 0, 0.38);
}

.page-hero::after {
    content: "";
    position: absolute;
    right: -80px;
    top: -80px;
    width: 240px;
    height: 240px;
    border-radius: 999px;
    background: rgba(56, 189, 248, 0.12);
    filter: blur(4px);
}

.page-hero h1 {
    max-width: 820px;
    margin: 0 0 16px;
}

.page-hero p {
    max-width: 720px;
    margin: 0;
    font-size: 1.05rem;
}

.library-hero::before {
    content: "♜";
    position: absolute;
    right: 42px;
    bottom: -46px;
    font-size: 12rem;
    opacity: 0.05;
}

.finder-hero {
    position: relative;
    overflow: hidden;
}

.finder-hero::after {
    content: "♛";
    position: absolute;
    right: 36px;
    bottom: -48px;
    font-size: 11rem;
    opacity: 0.055;
    transform: rotate(8deg);
}

.study-hero::before {
    content: "♞";
    position: absolute;
    right: 42px;
    bottom: -48px;
    font-size: 12rem;
    opacity: 0.055;
    transform: rotate(-12deg);
}

.study-hero .opening-actions {
    margin-top: 22px;
}

.profile-hero::before {
    content: "♚";
    position: absolute;
    right: 42px;
    bottom: -48px;
    font-size: 12rem;
    opacity: 0.055;
}

.opening-actions button {
    background: rgba(15, 23, 42, 0.75);
    color: var(--text-main);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.opening-actions button:first-child {
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: #020617;
    border: none;
    box-shadow: 0 14px 32px rgba(56, 189, 248, 0.22);
}

.opening-stack,
.related-section,
.practice-history,
.session-summary {
    margin-top: 22px;
}

.related-section h2 {
    margin-top: 32px;
}

.results-container,
.library-overview,
.filter-panel,
.board-section {
    margin-bottom: 32px;
}

.card h3,
.opening-card h3 {
    margin-top: 0;
}

.board-panel,
.trainer-panel {
    min-width: 0;
}

.board-panel {
    position: sticky;
    top: 110px;
    align-self: start;
    padding: 18px;
    border-radius: 26px;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 34%),
        rgba(15, 23, 42, 0.78);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(16px);
}

.board-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 14px;
    margin-bottom: 16px;
}

.board-panel-header h3 {
    margin: 0 0 4px;
}

.board-panel-header p {
    margin: 0;
    font-size: 0.9rem;
}

.live-pill {
    display: inline-flex;
    align-items: center;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 900;
    color: #bbf7d0;
    background: rgba(34, 197, 94, 0.12);
    border: 1px solid rgba(34, 197, 94, 0.28);
}

.trainer-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.progress-track {
    width: 100%;
    height: 10px;
    margin-top: 14px;
    border-radius: 999px;
    overflow: hidden;
    background: rgba(2, 6, 23, 0.58);
    border: 1px solid var(--border-soft);
}

.progress-fill {
    height: 100%;
    width: 0%;
    border-radius: 999px;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    transition: width 0.25s ease;
}

#moveExplanation {
    font-size: 1rem;
    line-height: 1.7;
    color: #cbd5e1;
}

.trainer-panel > .card:first-child {
    border-color: rgba(56, 189, 248, 0.24);
}

.trainer-panel > .card:first-child h3 {
    display: flex;
    align-items: center;
    gap: 8px;
}

.practice-box h3 {
    margin-top: 0;
}

.practice-history {
    background: rgba(2, 6, 23, 0.35);
    border: 1px solid var(--border-soft);
    border-radius: 16px;
    padding: 14px;
    margin: 16px 0;
}

.practice-history h4 {
    margin: 0 0 10px;
}

.difficulty-box {
    display: flex;
    align-items: center;
    gap: 10px;
    margin: 14px 0;
}

.difficulty-box label {
    color: var(--text-muted);
    font-weight: 700;
}

.session-summary {
    padding: 18px;
    border-radius: 18px;
    background:
        radial-gradient(circle at top left, rgba(34, 197, 94, 0.14), transparent 34%),
        rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(34, 197, 94, 0.24);
    box-shadow: var(--shadow-soft);
}

.session-summary h4 {
    margin-top: 0;
    color: #bbf7d0;
}

.session-summary button {
    margin-right: 8px;
    margin-top: 10px;
}

.move-controls {
    padding: 14px;
    border-radius: 18px;
    background: rgba(15, 23, 42, 0.55);
    border: 1px solid var(--border-soft);
}

.move-controls button {
    flex: 1;
    min-width: 92px;
}

.study-status {
    position: relative;
    overflow: hidden;
}

.study-status::after {
    content: "♟";
    position: absolute;
    right: 16px;
    top: 8px;
    font-size: 3.5rem;
    opacity: 0.035;
}

.move-list {
    max-height: 420px;
    overflow-y: auto;
}

.move-list::before {
    content: "Move List";
    display: block;
    margin-bottom: 12px;
    color: var(--text-main);
    font-weight: 900;
    letter-spacing: -0.02em;
}

.move-row {
    transition: transform 0.16s ease;
}

.move-row:hover {
    transform: translateX(3px);
}

.move-number {
    color: var(--text-muted);
    font-weight: 800;
}

@media (max-width: 950px) {
    .board-panel {
        position: relative;
        top: 0;
    }

    .board-panel-header {
        text-align: left;
    }
}

@media (max-width: 520px) {
    .board-panel {
        padding: 12px;
    }

    .move-controls button,
    .practice-controls button {
        flex: 1 1 100%;
    }
}

.beta-badge {
    display: inline-flex;
    align-items: center;
    margin-left: 8px;
    padding: 3px 8px;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 900;
    color: #bae6fd;
    background: rgba(56, 189, 248, 0.12);
    border: 1px solid rgba(56, 189, 248, 0.28);
    -webkit-text-fill-color: #bae6fd;
}

.app-footer {
    margin-top: 60px;
    padding: 24px;
    border-radius: 24px;
    border: 1px solid var(--border-soft);
    background: rgba(15, 23, 42, 0.55);
    backdrop-filter: blur(14px);
    display: flex;
    justify-content: space-between;
    gap: 18px;
    align-items: center;
}

.app-footer p {
    margin: 6px 0 0;
    font-size: 0.92rem;
}

.footer-links {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.footer-links button {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.footer-links button:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.055);
}

@media (max-width: 700px) {
    .app-footer {
        flex-direction: column;
        text-align: center;
    }

    .footer-links {
        justify-content: center;
    }
}

.empty-state {
    grid-column: 1 / -1;
    padding: 42px 24px;
    text-align: center;
    border-radius: 26px;
    border: 1px dashed rgba(148, 163, 184, 0.28);
    background: rgba(15, 23, 42, 0.58);
}

.empty-icon {
    font-size: 3rem;
    opacity: 0.35;
    margin-bottom: 12px;
}

.empty-state h3 {
    margin: 0 0 8px;
}

.empty-state p {
    max-width: 520px;
    margin: 0 auto 18px;
}

html,
body {
    max-width: 100%;
    overflow-x: clip;
}

img,
canvas,
iframe {
    max-width: 100%;
}

@media (max-width: 600px) {
    .container {
        width: min(100% - 20px, 1180px);
        padding-top: 16px;
        padding-bottom: 36px;
    }

    h1 {
        font-size: 2.15rem;
    }

    h2 {
        font-size: 1.55rem;
    }

    p {
        font-size: 0.95rem;
    }
}

@media (max-width: 760px) {
    .brand-bar {
        position: sticky;
        top: 8px;
        z-index: 50;
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
        padding: 8px 10px;
        border-radius: 18px;
        gap: 8px;
    }

    .brand-logo {
        font-size: 1rem;
        padding: 6px 8px;
        white-space: nowrap;
    }

    .brand-links {
        display: flex;
        gap: 5px;
        overflow-x: auto;
        scrollbar-width: none;
        flex-wrap: nowrap;
        justify-content: flex-start;
    }

    .brand-links::-webkit-scrollbar {
        display: none;
    }

    .brand-links button {
        flex: 0 0 auto;
        padding: 6px 9px;
        font-size: 0.78rem;
        white-space: nowrap;
    }
}

@media (max-width: 700px) {
    .home-hero,
    .finder-hero,
    .page-hero {
        padding: 28px 20px;
        border-radius: 24px;
        margin: 18px auto 24px;
    }

    .home-hero::after,
    .finder-hero::after,
    .page-hero::before,
    .page-hero::after {
        display: none;
    }

    .hero-badge {
        font-size: 0.78rem;
    }

    .home-hero-actions,
    .finder-input {
        flex-direction: column;
        align-items: stretch;
    }

    .home-hero-actions button,
    .finder-input button,
    .finder-input input {
        width: 100%;
    }
}

@media (max-width: 1100px) {
    .home-grid,
    .library-grid,
    #openingsContainer,
    #relatedOpenings {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 680px) {
    .home-grid,
    .library-grid,
    #openingsContainer,
    #relatedOpenings {
        grid-template-columns: 1fr;
    }

    .card,
    .opening-card,
    .library-card {
        padding: 16px;
    }

    .card-footer {
        flex-direction: column;
        align-items: stretch;
    }

    .card-footer button {
        width: 100%;
    }
}

@media (max-width: 760px) {
    .filter-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
        gap: 10px;
    }

    .filter-grid input,
    .filter-grid select {
        min-width: 0;
        font-size: 0.85rem;
        padding: 10px 9px;
    }

    .filter-panel {
        padding: 14px;
        border-radius: 20px;
    }

    .filter-header {
        margin-bottom: 14px;
    }

    .filter-header h2 {
        font-size: 1.35rem;
    }

    .filter-header p {
        font-size: 0.9rem;
    }
}

@media (max-width: 390px) {
    .filter-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 900px) {
    .library-overview {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 560px) {
    .library-overview {
        grid-template-columns: 1fr;
    }

    .stat-card p,
    .overview-card p {
        font-size: 1.4rem;
    }
}

@media (max-width: 950px) {
    .board-section {
        grid-template-columns: 1fr;
    }

    .board-panel {
        position: relative;
        top: 0;
        width: 100%;
    }

    #board {
        width: min(100%, 450px) !important;
        margin: 0 auto;
    }

    .trainer-panel {
        width: 100%;
    }
}

@media (max-width: 520px) {
    #board {
        width: min(100%, 340px) !important;
    }

    .board-panel {
        padding: 12px;
        border-radius: 22px;
    }

    .board-panel-header {
        flex-direction: column;
    }
}

@media (max-width: 600px) {
    .move-controls,
    .practice-controls,
    .opening-actions {
        display: grid;
        grid-template-columns: 1fr;
    }

    .move-controls button,
    .practice-controls button,
    .opening-actions button {
        width: 100%;
    }

    .practice-score {
        grid-template-columns: 1fr;
    }

    .practice-input-group {
        flex-direction: column;
    }

    .practice-input-group input,
    .practice-input-group button {
        width: 100%;
    }
}

@media (max-width: 520px) {
    .move-row {
        grid-template-columns: 38px 1fr 1fr;
        gap: 5px;
    }

    .move-row > div {
        padding: 8px 6px;
        font-size: 0.82rem;
    }

    .move-list {
        max-height: 320px;
    }
}

@media (max-width: 850px) {
    .results-row {
        grid-template-columns: 1fr;
    }

    #avoidOpenings {
        grid-template-columns: 1fr;
    }

    .finder-hero {
        padding: 28px 20px;
    }
}

@media (max-width: 700px) {
    .app-footer {
        padding: 18px;
        border-radius: 22px;
    }

    .footer-links {
        width: 100%;
        display: grid;
        grid-template-columns: 1fr;
    }

    .footer-links button {
        width: 100%;
    }
}

.filter-search {
    grid-column: span 2;
}

@media (min-width: 761px) {
    .filter-search {
        grid-column: span 2;
    }
}

@media (max-width: 390px) {
    .filter-search {
        grid-column: span 1;
    }
}

.filter-active {
    border-color: rgba(56, 189, 248, 0.9) !important;
    background:
        linear-gradient(135deg, rgba(56, 189, 248, 0.18), rgba(167, 139, 250, 0.12)),
        rgba(15, 23, 42, 0.95) !important;
    box-shadow:
        0 0 0 3px rgba(56, 189, 248, 0.12),
        0 12px 26px rgba(56, 189, 248, 0.12);
    color: var(--text-main);
}

.filter-active-label {
    color: #bae6fd !important;
}

.clear-filters-btn {
    color: var(--text-main);
    background: rgba(15, 23, 42, 0.8);
    border: 1px solid rgba(56, 189, 248, 0.35);
    box-shadow: none;
}

@media (max-width: 760px) {
    .clear-filters-btn {
        width: 100%;
        grid-column: span 2;
    }
}

@media (max-width: 390px) {
    .clear-filters-btn {
        grid-column: span 1;
    }
}

.filter-panel input.filter-active,
.filter-panel select.filter-active {
    border-color: rgba(56, 189, 248, 0.95) !important;
    background:
        linear-gradient(135deg, rgba(56, 189, 248, 0.22), rgba(167, 139, 250, 0.14)),
        rgba(15, 23, 42, 0.98) !important;
    box-shadow:
        0 0 0 3px rgba(56, 189, 248, 0.16),
        0 14px 30px rgba(56, 189, 248, 0.16) !important;
    color: #f8fafc !important;
}

.filter-panel select.filter-active {
    outline: none;
}

.clear-filters-btn {
    color: var(--text-main) !important;
    background: rgba(15, 23, 42, 0.85) !important;
    border: 1px solid rgba(56, 189, 248, 0.4) !important;
    box-shadow: none !important;
}

.filter-buttons button.filter-button-active,
.filter-buttons button.active-filter,
.filter-buttons button.active-color,
.filter-buttons button.active-practice-filter,
.filter-buttons button.active-style,
.filter-buttons button.active-family,
.filter-buttons button.active-variation,
.filter-buttons button.active-eco {
    color: #020617 !important;
    background: linear-gradient(135deg, var(--accent), var(--accent-2)) !important;
    border-color: transparent !important;
    box-shadow:
        0 0 0 3px rgba(56, 189, 248, 0.14),
        0 14px 32px rgba(56, 189, 248, 0.22) !important;
    transform: translateY(-1px);
}

.filter-buttons button {
    background: rgba(15, 23, 42, 0.75);
    color: var(--text-muted);
    border: 1px solid var(--border-soft);
    box-shadow: none;
}

.filter-buttons button:hover {
    color: var(--text-main);
    border-color: rgba(56, 189, 248, 0.35);
    background: rgba(30, 41, 59, 0.9);
}

.filter-buttons {
    display: flex;
    gap: 8px;
    flex-wrap: nowrap;
    overflow-x: auto;
    padding: 8px 2px 10px;
    scrollbar-width: none;
}

.filter-buttons::-webkit-scrollbar {
    display: none;
}

.filter-buttons button {
    flex: 0 0 auto;
    white-space: nowrap;
    padding: 8px 12px;
    font-size: 0.86rem;
}

.library-controls {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 10px;
    width: 100%;
}

.filter-grid {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

@media (max-width: 760px) {
    .library-controls {
        grid-template-columns: 1fr;
    }

    .filter-buttons {
        margin-left: -2px;
        margin-right: -2px;
    }

    .filter-buttons button {
        font-size: 0.78rem;
        padding: 7px 10px;
    }
}

.library-controls {
    display: grid;
    grid-template-columns: minmax(220px, 2fr) minmax(150px, 1fr) minmax(150px, 1fr);
    gap: 10px;
    width: 100%;
    align-items: center;
}

.library-controls input,
.library-controls select {
    width: 100%;
    min-width: 0;
}

.library-select {
    appearance: none;
    -webkit-appearance: none;
    min-height: 46px;
    color: var(--text-main) !important;
    background:
        linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(30, 41, 59, 0.92)) !important;
    border: 1px solid var(--border-soft) !important;
    border-radius: 14px;
    padding: 12px 38px 12px 14px;
    cursor: pointer;
    background-image:
        linear-gradient(135deg, rgba(15, 23, 42, 0.96), rgba(30, 41, 59, 0.92)),
        linear-gradient(45deg, transparent 50%, #94a3b8 50%),
        linear-gradient(135deg, #94a3b8 50%, transparent 50%);
    background-position:
        0 0,
        calc(100% - 18px) 19px,
        calc(100% - 13px) 19px;
    background-size:
        100% 100%,
        5px 5px,
        5px 5px;
    background-repeat: no-repeat;
}

.library-select:hover,
.library-select:focus {
    border-color: rgba(56, 189, 248, 0.65) !important;
    box-shadow: 0 0 0 3px rgba(56, 189, 248, 0.12);
}

.library-select option {
    background: #0f172a;
    color: #f8fafc;
}

.source-select {
    border-color: rgba(167, 139, 250, 0.28) !important;
}

@media (max-width: 760px) {
    .library-controls {
        grid-template-columns: 1fr;
    }

    .library-select {
        min-height: 44px;
        font-size: 0.9rem;
    }
}

/* ================================
   FINAL OPENING STUDY LAYOUT FIX
================================ */

.container {
    overflow: visible !important;
}

.board-section {
    display: grid !important;
    grid-template-columns: minmax(320px, 480px) minmax(0, 1fr) !important;
    gap: 24px !important;
    align-items: start !important;
    margin-top: 28px;
    margin-bottom: 32px;
    overflow: visible !important;
    position: relative !important;
    animation: none !important;
    transform: none !important;
}

.board-panel {
    position: sticky !important;
    top: 96px !important;
    align-self: start !important;
    height: fit-content !important;
    max-height: calc(100vh - 120px);
    padding: 18px;
    border-radius: 26px;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.12), transparent 34%),
        rgba(15, 23, 42, 0.78);
    box-shadow: var(--shadow-soft);
    backdrop-filter: blur(16px);
    overflow: visible !important;
    transform: none !important;
    animation: none !important;
    z-index: 20;
}

.trainer-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
    min-height: 1200px;
    overflow: visible !important;
    transform: none !important;
    animation: none !important;
}

#board {
    width: min(100%, 450px) !important;
    margin: 0 auto;
    border-radius: 18px;
    overflow: hidden;
    box-shadow: 0 24px 55px rgba(0, 0, 0, 0.38);
    border: 1px solid var(--border-soft);
}

@media (max-width: 950px) {
    .board-section {
        grid-template-columns: 1fr !important;
    }

    .board-panel {
        position: relative !important;
        top: 0 !important;
        max-height: none !important;
    }

    .trainer-panel {
        min-height: auto;
    }

    #board {
        width: min(100%, 450px) !important;
    }
}

@media (max-width: 520px) {
    #board {
        width: min(100%, 340px) !important;
    }

    .board-panel {
        padding: 12px;
        border-radius: 22px;
    }

    .board-panel-header {
        flex-direction: column;
    }
}

/* ================================
   SMOOTH STICKY CHESSBOARD FIX
================================ */

.board-panel {
    position: sticky !important;
    top: 96px !important;
    align-self: start !important;

    background: transparent !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;

    border: none !important;
    padding: 0 !important;

    transform: none !important;
    animation: none !important;
    transition: none !important;

    overflow: visible !important;
    z-index: 20 !important;
}

.board-panel-header {
    margin-bottom: 14px;
    padding: 16px 18px;
    border-radius: 22px;
    border: 1px solid var(--border-soft);
    background: rgba(15, 23, 42, 0.9);
    box-shadow: 0 14px 32px rgba(0, 0, 0, 0.22);
}

#board {
    width: min(100%, 450px) !important;
    margin: 0 auto;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-soft);
    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
}

@media (max-width: 950px) {
    .board-panel {
        position: relative !important;
        top: 0 !important;
    }
}

.board-sticky-column {
    position: sticky !important;
    top: 96px !important;
    align-self: start !important;
    height: fit-content !important;

    background: transparent !important;
    border: none !important;
    box-shadow: none !important;
    backdrop-filter: none !important;
    -webkit-backdrop-filter: none !important;

    transform: none !important;
    animation: none !important;
    transition: none !important;
    overflow: visible !important;
    z-index: 20;
}

.board-sticky-column #board {
    width: min(100%, 450px) !important;
    margin: 0 auto;
    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
}

@media (max-width: 950px) {
    .board-sticky-column {
        position: relative !important;
        top: 0 !important;
    }
}

/* ================================
   DIRECT STICKY BOARD FIX
================================ */

.board-section {
    display: grid !important;
    grid-template-columns: minmax(320px, 480px) minmax(0, 1fr) !important;
    gap: 24px !important;
    align-items: start !important;
    position: relative !important;
    overflow: visible !important;
    transform: none !important;
    animation: none !important;
}

.sticky-board {
    position: sticky !important;
    top: 96px !important;
    align-self: start !important;
    width: min(100%, 450px) !important;
    margin: 0 auto !important;

    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-soft);

    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
    z-index: 20;
}

.trainer-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
    overflow: visible !important;
    transform: none !important;
    animation: none !important;
}

.container {
    overflow: visible !important;
    transform: none !important;
}

@media (max-width: 950px) {
    .board-section {
        grid-template-columns: 1fr !important;
    }

    .sticky-board {
        position: relative !important;
        top: 0 !important;
        width: min(100%, 450px) !important;
    }
}

@media (max-width: 520px) {
    .sticky-board {
        width: min(100%, 340px) !important;
    }
}

/* ================================
   SMOOTH BOARD + SCROLLING TRAINER
   No sticky. Keeps board visible.
================================ */

.study-scroll-layout {
    display: grid !important;
    grid-template-columns: minmax(320px, 480px) minmax(0, 1fr) !important;
    gap: 24px !important;
    align-items: start !important;

    height: calc(100vh - 130px) !important;
    min-height: 620px !important;

    overflow: visible !important;
    transform: none !important;
    animation: none !important;
}

.study-board {
    position: relative !important;
    top: auto !important;
    align-self: start !important;

    width: min(100%, 450px) !important;
    margin: 0 auto !important;

    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-soft);

    box-shadow: none !important;
    transform: none !important;
    animation: none !important;
    transition: none !important;
    z-index: 2;
}

.study-scroll-layout .trainer-panel {
    max-height: calc(100vh - 130px) !important;
    overflow-y: auto !important;
    overflow-x: hidden !important;

    padding-right: 8px;
    padding-bottom: 24px;

    transform: none !important;
    animation: none !important;
}

.study-scroll-layout .trainer-panel::-webkit-scrollbar {
    width: 8px;
}

.study-scroll-layout .trainer-panel::-webkit-scrollbar-track {
    background: rgba(2, 6, 23, 0.4);
    border-radius: 999px;
}

.study-scroll-layout .trainer-panel::-webkit-scrollbar-thumb {
    background: rgba(148, 163, 184, 0.35);
    border-radius: 999px;
}

.study-scroll-layout .trainer-panel::-webkit-scrollbar-thumb:hover {
    background: rgba(56, 189, 248, 0.45);
}

@media (max-width: 950px) {
    .study-scroll-layout {
        grid-template-columns: 1fr !important;
        height: auto !important;
        min-height: auto !important;
    }

    .study-board {
        width: min(100%, 450px) !important;
    }

    .study-scroll-layout .trainer-panel {
        max-height: none !important;
        overflow-y: visible !important;
        padding-right: 0;
    }
}

@media (max-width: 520px) {
    .study-board {
        width: min(100%, 340px) !important;
    }
}

/* ================================
   CLEAN OPENING STUDY LAYOUT
   Smooth board, no sticky
================================ */

.clean-study-layout {
    display: grid !important;
    grid-template-columns: minmax(320px, 480px) minmax(0, 1fr) !important;
    gap: 24px !important;
    align-items: start !important;
    margin-top: 28px;
    margin-bottom: 32px;

    overflow: visible !important;
    transform: none !important;
    animation: none !important;
}

.board-area {
    min-width: 0;
    padding: 18px;
    border-radius: 26px;
    border: 1px solid var(--border-soft);
    background:
        radial-gradient(circle at top left, rgba(56, 189, 248, 0.10), transparent 34%),
        rgba(15, 23, 42, 0.78);
    box-shadow: var(--shadow-soft);
    transform: none !important;
    animation: none !important;
}

.board-area-header {
    display: flex;
    justify-content: space-between;
    align-items: start;
    gap: 14px;
    margin-bottom: 16px;
}

.board-area-header h3 {
    margin: 0 0 4px;
}

.board-area-header p {
    margin: 0;
    font-size: 0.9rem;
}

.clean-study-layout #board {
    width: min(100%, 450px) !important;
    margin: 0 auto;
    border-radius: 18px;
    overflow: hidden;
    border: 1px solid var(--border-soft);
    box-shadow: 0 18px 42px rgba(0, 0, 0, 0.28);
    transform: none !important;
    animation: none !important;
}

.clean-study-layout .trainer-panel {
    display: flex;
    flex-direction: column;
    gap: 16px;
    min-width: 0;
    transform: none !important;
    animation: none !important;
}

.clean-study-layout .move-controls {
    display: grid;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 10px;
}

.clean-study-layout .move-controls button {
    width: 100%;
    min-width: 0;
    padding: 10px 12px;
}

.clean-study-layout .practice-controls {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 10px;
}

.clean-study-layout .practice-controls button {
    width: 100%;
    min-width: 0;
}

@media (max-width: 1050px) {
    .clean-study-layout .move-controls {
        grid-template-columns: repeat(3, minmax(0, 1fr));
    }

    .clean-study-layout .practice-controls {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 950px) {
    .clean-study-layout {
        grid-template-columns: 1fr !important;
    }

    .clean-study-layout #board {
        width: min(100%, 450px) !important;
    }
}

@media (max-width: 560px) {
    .board-area {
        padding: 12px;
        border-radius: 22px;
    }

    .board-area-header {
        flex-direction: column;
    }

    .clean-study-layout #board {
        width: min(100%, 340px) !important;
    }

    .clean-study-layout .move-controls,
    .clean-study-layout .practice-controls {
        grid-template-columns: 1fr;
    }
}