/* ---------------------------------------------------------------
   PairFX Opening Selector — Chess Opening Advisor
   Restyled to match the PairFX tournament manager (dark chess theme).
--------------------------------------------------------------- */

:root {
    --color-primary: #1a1a1a;
    --color-secondary: #2d2d2d;
    --color-accent: #4a4a4a;
    --color-light: #e8e8e8;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-success: #28a745;
    --color-warning: #ffc107;
    --color-danger: #dc3545;
    --color-info: #17a2b8;

    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;

    --border-radius: 8px;
    --transition-speed: 0.2s;
}

* {
    box-sizing: border-box;
}

html, body {
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: var(--color-light);
    min-height: 100vh;
    line-height: 1.6;
}

.page {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* ---------- header ---------- */

header {
    background: var(--color-black);
    padding: var(--spacing-lg);
    text-align: center;
    border-bottom: 3px solid var(--color-accent);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--color-white);
}

.subtitle {
    color: var(--color-light);
    font-size: 1rem;
    opacity: 0.9;
}

.back-link {
    display: inline-block;
    margin-top: var(--spacing-xs);
    color: var(--color-accent);
    font-size: 0.9rem;
    text-decoration: underline;
}

.back-link:hover {
    color: var(--color-light);
}

.rank {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: var(--spacing-xs);
    max-width: 320px;
    margin: var(--spacing-lg) auto 0;
}

.rank-square {
    width: 100%;
    aspect-ratio: 1;
    background: var(--color-secondary);
    border: 1px solid var(--color-accent);
    border-radius: 2px;
}

.rank-square.is-filled {
    background: var(--color-success);
    border-color: #218838;
}

@media (prefers-reduced-motion: no-preference) {
    .rank-square { transition: background var(--transition-speed) ease, border-color var(--transition-speed) ease; }
}

/* ---------- main / question card ---------- */

main {
    flex: 1;
    padding: var(--spacing-lg);
    max-width: 780px;
    margin: 0 auto;
    width: 100%;
}

.loading {
    color: var(--color-light);
    opacity: 0.7;
    text-align: center;
    padding: var(--spacing-xl);
}

.card {
    background: var(--color-secondary);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3);
    padding: var(--spacing-xl);
    max-width: 640px;
    margin: 0 auto;
}

@media (max-width: 560px) {
    .card { padding: var(--spacing-lg); }
}

.step-back {
    background: none;
    border: none;
    color: var(--color-light);
    opacity: 0.7;
    font-size: 0.85rem;
    padding: 0;
    margin-bottom: var(--spacing-md);
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-speed);
}
.step-back:hover { color: var(--color-white); opacity: 1; }

.eyebrow {
    font-family: 'Courier New', monospace;
    font-size: 0.72rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-warning);
    margin: 0 0 var(--spacing-sm);
    font-weight: bold;
}

h1.question {
    font-weight: 700;
    font-size: 1.6rem;
    line-height: 1.25;
    margin: 0 0 var(--spacing-xs);
    color: var(--color-white);
}

.question-hint {
    color: var(--color-light);
    opacity: 0.8;
    font-size: 0.92rem;
    margin: 0 0 var(--spacing-lg);
}

/* option tiles: single/multi choice */

.options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.options.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
}
@media (max-width: 560px) {
    .options.grid-2 { grid-template-columns: 1fr; }
}

.tile {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    width: 100%;
    text-align: left;
    background: var(--color-primary);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    font-family: inherit;
    font-size: 0.98rem;
    color: var(--color-white);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.tile:hover { border-color: var(--color-info); }

.tile:focus-visible {
    outline: 2px solid var(--color-info);
    outline-offset: 2px;
}

.tile.is-selected {
    border-color: var(--color-success);
    background: rgba(40, 167, 69, 0.2);
}

.tile-label { font-weight: 600; }
.tile-sub { color: var(--color-light); opacity: 0.7; font-size: 0.84rem; }

/* 5-point scale question */

.scale {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.scale-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    color: var(--color-light);
    opacity: 0.8;
}

.scale-row {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: var(--spacing-sm);
}

.scale-point {
    aspect-ratio: 1;
    border: 2px solid var(--color-accent);
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    transition: all var(--transition-speed);
}

.scale-point:hover { border-color: var(--color-info); }
.scale-point:focus-visible { outline: 2px solid var(--color-info); outline-offset: 2px; }
.scale-point.is-selected { background: var(--color-success); border-color: #218838; }

/* continue button for multi-select steps */

.continue-row {
    margin-top: var(--spacing-lg);
    display: flex;
    justify-content: flex-end;
}

.btn {
    font-family: inherit;
    font-weight: 600;
    font-size: 1rem;
    border: none;
    background: var(--color-success);
    color: var(--color-white);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    cursor: pointer;
    transition: all var(--transition-speed);
}
.btn:hover { background: #218838; transform: translateY(-2px); box-shadow: 0 4px 8px rgba(0, 0, 0, 0.3); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; transform: none; box-shadow: none; }
.btn:focus-visible { outline: 2px solid var(--color-white); outline-offset: 2px; }

.btn.secondary {
    background: var(--color-accent);
    color: var(--color-white);
}
.btn.secondary:hover { background: #5a5a5a; }

/* ---------- results ---------- */

.results-head {
    margin-bottom: var(--spacing-xl);
    text-align: center;
}

.results-head h1 {
    font-weight: 700;
    font-size: 1.9rem;
    margin: 0 0 var(--spacing-xs);
    color: var(--color-white);
}

.results-head p { color: var(--color-light); opacity: 0.8; margin: 0; }

.timecontrol-section { margin-bottom: var(--spacing-xl); max-width: 640px; margin-left: auto; margin-right: auto; }

.timecontrol-title {
    font-family: 'Courier New', monospace;
    font-size: 0.85rem;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-warning);
    font-weight: bold;
    border-bottom: 2px solid var(--color-accent);
    padding-bottom: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.result-card {
    display: grid;
    grid-template-columns: 44px 1fr;
    gap: var(--spacing-md);
    background: var(--color-primary);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    transition: all var(--transition-speed);
}

.result-card:hover { border-color: var(--color-success); }

.result-card.result-card--no-rank {
    grid-template-columns: 1fr;
}

.rank-badge {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--color-warning);
    line-height: 1;
    align-self: start;
}

.result-name {
    font-weight: 600;
    font-size: 1.05rem;
    color: var(--color-white);
}

.result-meta {
    font-family: 'Courier New', monospace;
    font-size: 0.78rem;
    color: var(--color-light);
    opacity: 0.7;
    margin: 2px 0 var(--spacing-sm);
}

.result-pgn {
    display: inline-block;
    font-family: 'Courier New', monospace;
    font-size: 0.82rem;
    color: var(--color-info);
    background: var(--color-secondary);
    border: 1px solid var(--color-accent);
    border-radius: 5px;
    padding: 3px 8px;
    margin-bottom: var(--spacing-sm);
}

.result-overview {
    font-size: 0.88rem;
    color: var(--color-light);
    opacity: 0.85;
    margin: 0 0 var(--spacing-sm);
}

.result-rationale {
    font-size: 0.92rem;
    color: var(--color-light);
    margin: 0;
}

.result-reputation {
    margin-top: var(--spacing-sm);
    padding: 6px 10px;
    background: var(--color-secondary);
    border-left: 3px solid var(--color-warning);
    border-radius: 4px;
}

.result-reputation-label {
    display: block;
    font-size: 0.72rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-warning);
    margin-bottom: 2px;
}

.result-reputation p {
    font-size: 0.85rem;
    color: var(--color-light);
    margin: 0;
}

.result-deeper {
    margin-top: var(--spacing-sm);
    padding-top: var(--spacing-sm);
    border-top: 1px solid var(--color-accent);
}

.result-deeper-label {
    font-size: 0.78rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--color-light);
    opacity: 0.7;
    margin: 0 0 4px;
}

.result-deeper ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.result-deeper li {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 8px;
    font-size: 0.85rem;
}

.result-deeper-name {
    color: var(--color-light);
}

.result-deeper-pgn {
    font-family: 'Courier New', monospace;
    font-size: 0.78rem;
    color: var(--color-info);
    opacity: 0.85;
}

.empty-note {
    color: var(--color-light);
    opacity: 0.6;
    font-size: 0.9rem;
    font-style: italic;
}

.restart-row {
    margin-top: var(--spacing-md);
    text-align: center;
}

/* ---------- start screen ---------- */

.start-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.start-option {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    width: 100%;
    text-align: left;
    background: var(--color-primary);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-lg);
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.start-option:hover { border-color: var(--color-info); transform: translateY(-2px); }
.start-option:focus-visible { outline: 2px solid var(--color-info); outline-offset: 2px; }

.start-option-title { font-weight: 700; font-size: 1.1rem; color: var(--color-white); }
.start-option-sub { color: var(--color-light); opacity: 0.75; font-size: 0.88rem; }

/* ---------- search screen ---------- */

.search-input {
    display: block;
    width: 100%;
    margin-top: var(--spacing-md);
    background: var(--color-primary);
    border: 2px solid var(--color-accent);
    border-radius: var(--border-radius);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-white);
    font-family: inherit;
    font-size: 1rem;
}

.search-input:focus { outline: none; border-color: var(--color-info); }
.search-input::placeholder { color: var(--color-light); opacity: 0.5; }

.search-results {
    margin-top: var(--spacing-sm);
    display: flex;
    flex-direction: column;
    gap: 6px;
    max-height: 340px;
    overflow-y: auto;
}

.search-result {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    text-align: left;
    background: var(--color-primary);
    border: 1px solid var(--color-accent);
    border-radius: 6px;
    padding: var(--spacing-sm) var(--spacing-md);
    font-family: inherit;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.search-result:hover { border-color: var(--color-info); }
.search-result:focus-visible { outline: 2px solid var(--color-info); outline-offset: 2px; }

.search-result-name { color: var(--color-white); font-size: 0.95rem; }
.search-result-meta {
    font-family: 'Courier New', monospace;
    font-size: 0.75rem;
    color: var(--color-light);
    opacity: 0.6;
    white-space: nowrap;
    flex-shrink: 0;
}

@media (max-width: 560px) {
    .search-result { flex-direction: column; align-items: flex-start; gap: 2px; }
}

/* ---------- footer ---------- */

.footer {
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    font-size: 0.78rem;
    color: var(--color-light);
    opacity: 0.6;
    font-family: 'Courier New', monospace;
    text-align: center;
}

/* === Scrollbar Styling === */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-accent);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-success);
}

/* === Responsive === */
@media (max-width: 768px) {
    .wordmark-title { font-size: 1.4rem; }
    .topbar { flex-direction: column; align-items: flex-start; }
    .rank { align-self: flex-start; }
}