:root {
    --bg: #f4f2ec;
    --bg-2: #ede9df;
    --panel: #ffffff;
    --panel-soft: #f9f6f0;
    --accent: #7fa650;
    --accent-dark: #5f7f3b;
    --accent-bright: #a6d26a;
    --gold: #f2c261;
    --danger: #d45a5a;
    --text: #1f2a24;
    --text-muted: #4d5a52;
    --text-soft: #7a857d;
    --border: #e1ddd2;
    --shadow: 0 18px 45px rgba(31, 42, 36, 0.12);
    --shadow-soft: 0 8px 20px rgba(31, 42, 36, 0.08);
    --radius-s: 8px;
    --radius-m: 14px;
    --radius-l: 18px;
    --radius-xl: 28px;
    --font-display: 'Sora', 'Plus Jakarta Sans', sans-serif;
    --font-body: 'Plus Jakarta Sans', 'Sora', sans-serif;
    --transition-fast: 0.2s ease;
    --transition: 0.3s ease;
    --max-width: 1200px;
}

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

body {
    font-family: var(--font-body);
    color: var(--text);
    background:
        radial-gradient(circle at 20% 15%, rgba(127, 166, 80, 0.12), transparent 35%),
        radial-gradient(circle at 80% 10%, rgba(242, 194, 97, 0.12), transparent 40%),
        var(--bg);
    line-height: 1.6;
    overflow-x: hidden;
}

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

.bg-mesh {
    position: fixed;
    inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(127, 166, 80, 0.2), transparent 45%),
                radial-gradient(circle at 80% 70%, rgba(242, 194, 97, 0.12), transparent 40%);
    opacity: 0.6;
    z-index: -2;
}

.bg-grid {
    position: fixed;
    inset: 0;
    background-image: linear-gradient(rgba(76, 92, 84, 0.08) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(76, 92, 84, 0.08) 1px, transparent 1px);
    background-size: 120px 120px;
    opacity: 0.25;
    z-index: -3;
}

.header {
    position: sticky;
    top: 0;
    z-index: 10;
    backdrop-filter: blur(14px);
    background: rgba(245, 243, 236, 0.85);
    border-bottom: 1px solid var(--border);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 16px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

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

.logo-mark {
    width: 42px;
    height: 42px;
    border-radius: 12px;
    background: linear-gradient(135deg, rgba(127, 166, 80, 0.2), rgba(242, 194, 97, 0.25));
    border: 1px solid rgba(127, 166, 80, 0.3);
    display: grid;
    place-items: center;
    box-shadow: var(--shadow-soft);
}

.logo-icon {
    font-size: 20px;
}

.logo-copy {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.logo-title {
    font-weight: 700;
    letter-spacing: -0.02em;
    font-family: var(--font-display);
}

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

.nav-links {
    display: flex;
    gap: 22px;
    font-weight: 600;
    color: var(--text-muted);
}

.nav-link {
    padding: 6px 0;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-link::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -6px;
    width: 0;
    height: 2px;
    background: var(--accent);
    transition: width var(--transition-fast);
}

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

.nav-link:hover::after {
    width: 100%;
}

.pill-button {
    padding: 10px 16px;
    border-radius: var(--radius-s);
    background: var(--accent);
    color: #0f1a12;
    font-weight: 700;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.pill-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 28px rgba(95, 127, 59, 0.2);
}

.hero {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 24px 32px;
}

.hero-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    align-items: center;
}

.hero-copy .eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.16em;
    font-size: 12px;
    color: var(--text-soft);
}

.hero-title {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(32px, 5vw, 52px);
    line-height: 1.12;
    margin: 16px 0;
}

.gradient-text {
    display: block;
    background: linear-gradient(120deg, var(--accent), var(--gold));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    color: var(--text-muted);
    margin-bottom: 18px;
}

.hero-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 18px;
}

.tag {
    padding: 8px 12px;
    background: var(--panel);
    border-radius: var(--radius-s);
    border: 1px solid var(--border);
    color: var(--text-muted);
    box-shadow: var(--shadow-soft);
}

.hero-actions {
    display: flex;
    gap: 12px;
    margin-bottom: 18px;
    flex-wrap: wrap;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 18px;
    background: linear-gradient(120deg, var(--accent), var(--accent-bright));
    color: #0f1a12;
    border-radius: var(--radius-m);
    font-weight: 700;
    border: none;
    cursor: pointer;
    box-shadow: var(--shadow);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.cta-button.full {
    width: 100%;
    justify-content: center;
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 16px 32px rgba(127, 166, 80, 0.25);
}

.ghost-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    padding: 12px 16px;
    border-radius: var(--radius-m);
    border: 1px solid var(--border);
    background: var(--panel);
    color: var(--text);
    font-weight: 700;
    cursor: pointer;
    transition: border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast);
}

.ghost-button.full {
    width: 100%;
}

.ghost-button.compact {
    padding: 10px 14px;
}

.ghost-button:hover {
    border-color: var(--accent);
    color: var(--accent-dark);
    transform: translateY(-1px);
}

.signal-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: 12px;
    margin-top: 6px;
}

.signal-card {
    padding: 12px 14px;
    border-radius: var(--radius-s);
    border: 1px solid var(--border);
    background: var(--panel);
    box-shadow: var(--shadow-soft);
}

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

.signal-value {
    display: block;
    font-weight: 700;
}

.hero-visual .board-frame {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 18px;
    box-shadow: var(--shadow);
}

.board-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.board-eyebrow {
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-soft);
    font-size: 11px;
}

.board-title {
    margin-top: 4px;
    font-size: 20px;
}

.board-meta {
    display: flex;
    gap: 8px;
}

.pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    border-radius: 999px;
    background: var(--panel-soft);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-weight: 700;
    font-size: 12px;
}

.pill.ghost {
    background: transparent;
}

.hero-board {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    width: 100%;
    max-width: 420px;
    aspect-ratio: 1 / 1;
    border-radius: 14px;
    overflow: hidden;
    border: 1px solid var(--border);
    margin: 0 auto;
    background: #d7c9a8;
}

.hero-board .square {
    display: grid;
    place-items: center;
    font-size: clamp(18px, 2.2vw, 28px);
    color: #0f1a12;
    font-family: "Noto Sans Symbols 2", "Segoe UI Symbol", "Arial Unicode MS", var(--font-body);
    line-height: 1;
    text-shadow: 0 1px 2px rgba(255, 255, 255, 0.35);
}

.hero-board .square:nth-child(16n + 1),
.hero-board .square:nth-child(16n + 3),
.hero-board .square:nth-child(16n + 5),
.hero-board .square:nth-child(16n + 7),
.hero-board .square:nth-child(16n + 10),
.hero-board .square:nth-child(16n + 12),
.hero-board .square:nth-child(16n + 14),
.hero-board .square:nth-child(16n + 16) {
    background: #f0d9b5;
}

.hero-board .square:nth-child(16n + 2),
.hero-board .square:nth-child(16n + 4),
.hero-board .square:nth-child(16n + 6),
.hero-board .square:nth-child(16n + 8),
.hero-board .square:nth-child(16n + 9),
.hero-board .square:nth-child(16n + 11),
.hero-board .square:nth-child(16n + 13),
.hero-board .square:nth-child(16n + 15) {
    background: #b58863;
}

.board-footer {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.mini-stat {
    padding: 10px 12px;
    border-radius: var(--radius-s);
    border: 1px solid var(--border);
    background: var(--panel-soft);
}

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

.mini-value {
    display: block;
    font-weight: 700;
}

.section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 64px 24px;
}

.section-heading {
    max-width: 820px;
    margin-bottom: 28px;
}

.section-title {
    font-family: var(--font-display);
    font-size: clamp(28px, 4vw, 40px);
    margin: 8px 0;
}

.section-subtitle {
    color: var(--text-muted);
}

.feature-mosaic {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 16px;
}

.feature-card {
    padding: 18px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-l);
    min-height: 170px;
    box-shadow: var(--shadow-soft);
    transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.feature-card:hover {
    transform: translateY(-4px);
    border-color: rgba(127, 166, 80, 0.5);
}

.icon-badge {
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: var(--panel-soft);
    border: 1px solid var(--border);
    display: grid;
    place-items: center;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--accent-dark);
}

.analysis-section {
    background: var(--bg-2);
    border-radius: var(--radius-xl);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
}

.analysis-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 16px;
    margin-top: 12px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-l);
    padding: 20px;
    box-shadow: var(--shadow-soft);
}

.panel-heading {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    align-items: flex-start;
    margin-bottom: 16px;
}

.panel-subtitle {
    color: var(--text-muted);
}

.dropzone {
    border: 1.5px dashed rgba(127, 166, 80, 0.5);
    border-radius: var(--radius-l);
    padding: 22px;
    text-align: center;
    background: var(--panel-soft);
    cursor: pointer;
    transition: border-color var(--transition-fast), transform var(--transition-fast);
}

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

.dropzone.dragging {
    border-color: var(--accent);
    background: rgba(127, 166, 80, 0.08);
}

.dropzone-illustration {
    font-size: 28px;
    margin-bottom: 10px;
    color: var(--accent);
}

.dropzone-title {
    font-weight: 700;
}

.dropzone-subtitle {
    color: var(--text-muted);
    margin-bottom: 10px;
}

.file-input {
    display: none;
}

.file-name {
    margin-top: 6px;
    color: var(--accent-dark);
    font-weight: 600;
    min-height: 22px;
}

.error-banner {
    margin-top: 12px;
    padding: 12px 14px;
    border-radius: var(--radius-m);
    border: 1px solid rgba(212, 90, 90, 0.4);
    background: rgba(212, 90, 90, 0.12);
    color: #7a1b1b;
    font-weight: 700;
    display: none;
}

.options-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 12px;
    margin: 16px 0;
}

.option-field {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.option-field label {
    font-weight: 600;
}

.option-field input {
    padding: 10px 12px;
    background: var(--panel-soft);
    border: 1px solid var(--border);
    border-radius: var(--radius-s);
    color: var(--text);
    font-family: var(--font-body);
}

.option-field input:focus {
    outline: 1px solid var(--accent);
    box-shadow: 0 0 0 4px rgba(127, 166, 80, 0.15);
}

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

.steps-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: 6px;
}

.step {
    display: grid;
    grid-template-columns: 48px 1fr;
    gap: 10px;
    padding: 12px;
    border-radius: var(--radius-m);
    border: 1px solid var(--border);
    background: var(--panel-soft);
}

.step-index {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    background: var(--panel);
    font-weight: 700;
    border: 1px solid var(--border);
    color: var(--accent-dark);
}

.step-title {
    font-weight: 700;
}

.step-text {
    color: var(--text-muted);
}

.mini-highlights {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
    margin-top: 12px;
}

.mini-card {
    padding: 12px;
    border-radius: var(--radius-s);
    border: 1px solid var(--border);
    background: var(--panel-soft);
}

.results-panel {
    margin-top: 18px;
}

.results-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 14px;
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 14px;
}

.card {
    padding: 16px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-l);
    box-shadow: var(--shadow-soft);
}

.summary-card .summary-body {
    display: grid;
    gap: 8px;
}

.summary-chip {
    padding: 8px 10px;
    border-radius: var(--radius-m);
    background: var(--panel-soft);
    border: 1px solid var(--border);
    font-weight: 700;
    color: var(--text);
}

.summary-chip.advantage {
    color: var(--accent-dark);
}

.summary-chip.misses {
    color: #b6571d;
}

.summary-chip.brilliants {
    color: #2c6eb2;
}

.card-heading {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 10px;
}

.accuracy-card .accuracy-value {
    font-size: 32px;
    font-weight: 800;
}

.accuracy-card.white .accuracy-value {
    color: var(--accent-dark);
}

.accuracy-card.black .accuracy-value {
    color: #2f6e63;
}

.progress-track {
    width: 100%;
    height: 10px;
    border-radius: 12px;
    background: var(--panel-soft);
    overflow: hidden;
    border: 1px solid var(--border);
}

.progress-fill {
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, var(--accent), var(--accent-bright));
    transition: width 0.8s ease;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 10px;
}

.stat-item {
    padding: 12px;
    border-radius: var(--radius-m);
    border: 1px solid var(--border);
    background: var(--panel-soft);
}

.stat-item-label {
    color: var(--text-muted);
    font-size: 13px;
}

.stat-item-value {
    font-size: 24px;
    font-weight: 800;
}

.game-info-card #gameInfo {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 8px;
    color: var(--text-muted);
}

.critical-card .card-heading {
    margin-bottom: 6px;
}

.moment-card {
    border: 1px solid var(--border);
    border-radius: var(--radius-m);
    padding: 12px;
    background: var(--panel-soft);
    margin-bottom: 10px;
    transition: transform var(--transition-fast);
}

.moment-card:hover {
    transform: translateX(4px);
}

.moment-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 6px;
}

.moment-badge {
    padding: 6px 10px;
    border-radius: 999px;
    background: rgba(127, 166, 80, 0.12);
    border: 1px solid rgba(127, 166, 80, 0.4);
    font-weight: 700;
}

.moment-eval {
    font-weight: 700;
}

.moment-eval.positive {
    color: var(--accent-dark);
}

.moment-eval.negative {
    color: var(--danger);
}

.positive {
    color: var(--accent-dark);
}

.negative {
    color: var(--danger);
}

.moment-body {
    color: var(--text-muted);
    display: grid;
    gap: 4px;
}

.move-list-card {
    overflow: hidden;
}

.move-table-wrap {
    overflow-x: auto;
}

.move-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 13px;
}

.move-table thead th {
    text-align: left;
    color: var(--text-soft);
    font-weight: 700;
    padding: 8px 6px;
    border-bottom: 1px solid var(--border);
}

.move-table tbody td {
    padding: 8px 6px;
    border-bottom: 1px solid rgba(76, 92, 84, 0.08);
    color: var(--text-muted);
}

.move-table tbody tr:hover {
    background: rgba(127, 166, 80, 0.08);
}

.move-tag {
    display: inline-flex;
    padding: 4px 8px;
    border-radius: 999px;
    border: 1px solid var(--border);
    font-weight: 700;
    font-size: 11px;
    text-transform: capitalize;
}

.move-tag.brilliant {
    color: #2c6eb2;
    background: rgba(44, 110, 178, 0.12);
    border-color: rgba(44, 110, 178, 0.3);
}

.move-tag.blunder,
.move-tag.mistake {
    color: var(--danger);
    background: rgba(212, 90, 90, 0.12);
    border-color: rgba(212, 90, 90, 0.3);
}

.move-tag.inaccuracy {
    color: #b96a1f;
    background: rgba(185, 106, 31, 0.12);
    border-color: rgba(185, 106, 31, 0.3);
}

.move-tag.good {
    color: var(--accent-dark);
    background: rgba(127, 166, 80, 0.12);
    border-color: rgba(127, 166, 80, 0.3);
}

.move-tag.book {
    color: var(--text-soft);
    background: var(--panel-soft);
}

.moment-meta {
    font-weight: 700;
    color: var(--text);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
    margin-top: 12px;
}

.about-card {
    padding: 16px;
    border-radius: var(--radius-l);
    border: 1px solid var(--border);
    background: var(--panel);
    box-shadow: var(--shadow-soft);
}

.footer {
    border-top: 1px solid var(--border);
    padding: 24px;
    background: rgba(245, 243, 236, 0.9);
    margin-top: 40px;
}

.footer-content {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
}

.footer-links {
    display: flex;
    gap: 16px;
    color: var(--text-muted);
}

.footer-link:hover {
    color: var(--accent-dark);
}

.spinner {
    display: none;
    width: 18px;
    height: 18px;
    border: 3px solid rgba(15, 26, 18, 0.15);
    border-top-color: rgba(15, 26, 18, 0.6);
    border-radius: 50%;
    animation: spin 0.7s linear infinite;
}

.spinner.active {
    display: inline-block;
}

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

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    .hero {
        padding-top: 32px;
    }
    .board-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 6px;
    }
    .panel-heading {
        flex-direction: column;
    }
    .results-grid {
        grid-template-columns: 1fr;
    }
}