:root {
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --card-border: #334155;
    
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: rgba(148, 163, 184, 0.55);
    
    --accent-color: #2563eb;
    --accent-glow: rgba(37, 99, 235, 0.4);
    
    --p1-color: #e11d48;
    --p2-color: #06b6d4;
    
    --board-bg: #2563eb;
    --board-border: #1d4ed8;
    --slot-bg: #0f172a;
    
    /* Fluid board: shrink cells so 7 columns always fit the viewport */
    --board-gap: 8px;
    --board-padding: 16px;
    --board-frame: calc((2 * var(--board-padding)) + 6px + (6 * var(--board-gap)));
    --board-gutter: 56px; /* page + card horizontal chrome */
    --cell-size: min(60px, calc((100vw - var(--board-gutter) - var(--board-frame)) / 7));
    --disc-size: calc(var(--cell-size) * 0.833);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: 'Outfit', sans-serif;
    min-height: 100dvh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Header — same surface as page */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 5%;
    background-color: var(--bg-color);
    border-bottom: 1px solid rgba(51, 65, 85, 0.55);
    z-index: 10;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s ease;
}

.logo:hover {
    opacity: 0.85;
}

.logo:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 4px;
    border-radius: 8px;
}

.logo h1 {
    font-size: 22px;
    font-weight: 350;
    letter-spacing: 0.5px;
}

.logo h1 span {
    color: var(--accent-color);
    font-weight: 600;
}

/* Icon buttons + mobile-friendly tooltips */
.icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    border: 1px solid var(--card-border);
    background-color: rgba(30, 41, 59, 0.7);
    color: var(--text-primary);
    cursor: pointer;
    text-decoration: none;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.15s ease;
}

.icon-btn:hover,
.icon-btn:focus-visible,
.icon-btn.is-tooltip-open,
.icon-btn:active {
    background-color: #1e293b;
    border-color: #475569;
}

.icon-btn:active {
    transform: scale(0.96);
}

.icon-btn.is-pressed {
    background-color: rgba(37, 99, 235, 0.16);
    border-color: var(--accent-color);
    color: var(--text-primary);
}

.icon-btn:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.floating-tooltip {
    position: fixed;
    z-index: 1000;
    max-width: 240px;
    padding: 8px 12px;
    border-radius: 10px;
    background: #1e293b;
    border: 1px solid var(--card-border);
    color: var(--text-primary);
    font-size: 12px;
    line-height: 1.4;
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
    pointer-events: none;
    transform: translate(-50%, -100%);
}

.floating-tooltip.below {
    transform: translate(-50%, 0);
}

.floating-tooltip[hidden] {
    display: none !important;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 10px;
}

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-ghost:hover,
.btn-ghost:active {
    background: rgba(255, 255, 255, 0.04);
    border-color: #475569;
}

.btn-sm {
    padding: 8px 14px;
    font-size: 13px;
    border-radius: 10px;
}

.label-muted {
    color: var(--text-muted);
    font-weight: 400;
}

/* Layout */
.container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 28px 3% 40px;
    max-width: 1600px;
    width: 100%;
    margin: 0 auto;
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    font-family: 'Outfit', sans-serif;
    padding: 12px 24px;
    border-radius: 12px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.15s ease, border-color 0.2s ease;
    border: none;
    text-decoration: none;
    text-align: center;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.btn-primary {
    background-color: var(--accent-color);
    color: white;
}

.btn-primary:hover,
.btn-primary:active {
    background-color: #1d4ed8;
}

.btn-primary:active {
    transform: scale(0.98);
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-primary);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover,
.btn-secondary:active {
    background-color: rgba(255, 255, 255, 0.04);
    border-color: #475569;
}

.btn-secondary:active {
    transform: scale(0.98);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-start {
    margin-top: 4px;
    padding: 14px 24px;
    font-size: 15px;
    font-weight: 600;
}

.glass-card {
    background-color: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 20px;
    padding: 28px;
    box-shadow: 0 12px 28px -8px rgba(0, 0, 0, 0.35);
}

/* Lobby */
.lobby-screen {
    width: 100%;
    max-width: 1180px;
    display: flex;
    flex-direction: column;
    gap: 28px;
    animation: fadeIn 0.4s ease;
}

.lobby-top {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    width: 100%;
}

.lobby-eyebrow {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    color: var(--accent-color);
}

.lobby-title {
    font-size: clamp(28px, 4vw, 40px);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.15;
    text-wrap: balance;
    margin: 0;
    flex: 1;
    min-width: 0;
}

.lobby-card-header {
    margin-bottom: 22px;
    padding-bottom: 14px;
    border-bottom: 1px solid var(--card-border);
}

.lobby-card-header h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 4px;
}

.lobby-card-header p {
    font-size: 13px;
    color: var(--text-secondary);
}

.player-selectors {
    display: flex;
    justify-content: space-between;
    align-items: stretch;
    gap: 20px;
    margin-bottom: 22px;
    width: 100%;
}

.selector-column {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 12px;
    min-width: 0;
}

.column-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding-bottom: 8px;
    border-bottom: 1px dashed rgba(51, 65, 85, 0.8);
}

.column-header h3 {
    font-size: 14px;
    font-weight: 500;
}

.player-options {
    position: relative;
    width: 100%;
}

.player-options.match-active {
    pointer-events: none;
    opacity: 0.65;
}

.player-select-trigger {
    display: flex;
    align-items: center;
    gap: 8px;
    width: 100%;
    padding: 12px 14px;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    background-color: #111827;
    color: inherit;
    font: inherit;
    text-align: left;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    transition: border-color 0.2s ease, background-color 0.2s ease;
}

.selected-option-content {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 0;
    flex: 1;
}

.select-chevron {
    flex-shrink: 0;
    color: var(--text-secondary);
    transition: transform 0.2s ease, color 0.2s ease;
}

.player-options.open .select-chevron {
    transform: rotate(180deg);
    color: var(--text-primary);
}

.player-select-trigger:hover,
.player-select-trigger:focus-visible,
.player-options.open .player-select-trigger {
    background-color: #1f2937;
    outline: none;
}

.p1-selector .player-select-trigger {
    background-color: rgba(225, 29, 72, 0.08);
    border-color: var(--p1-color);
}

.p2-selector .player-select-trigger {
    background-color: rgba(6, 182, 212, 0.08);
    border-color: var(--p2-color);
}

.p1-selector .player-select-trigger .option-icon {
    background: var(--p1-color);
    color: #fff;
}

.p2-selector .player-select-trigger .option-icon {
    background: var(--p2-color);
    color: #fff;
}

.player-options-menu {
    position: absolute;
    top: calc(100% + 8px);
    left: 0;
    z-index: 30;
    display: none;
    flex-direction: column;
    gap: 8px;
    width: 100%;
    max-height: min(320px, 55dvh);
    overflow-y: auto;
    padding: 8px;
    border: 1px solid var(--card-border);
    border-radius: 14px;
    background: var(--card-bg);
    box-shadow: 0 18px 36px rgba(0, 0, 0, 0.45);
}

.player-options.open .player-options-menu {
    display: flex;
    animation: dropdownIn 0.18s ease-out;
}

@keyframes dropdownIn {
    from {
        opacity: 0;
        transform: translateY(-6px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.player-option-card {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 14px;
    background-color: #111827;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    cursor: pointer;
    transition: border-color 0.2s ease, background-color 0.2s ease, transform 0.15s ease;
    text-align: left;
    color: inherit;
    font: inherit;
    width: 100%;
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
}

.player-option-card:hover,
.player-option-card:focus-visible,
.player-option-card:active {
    background-color: #1f2937;
    border-color: #475569;
}

.player-option-card:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 1px;
}

.player-option-card:active {
    transform: scale(0.98);
}

.player-option-card.selected {
    background-color: rgba(37, 99, 235, 0.12);
    border-color: var(--accent-color);
}

.p1-selector .player-option-card.selected {
    background-color: rgba(225, 29, 72, 0.08);
    border-color: var(--p1-color);
}

.p2-selector .player-option-card.selected {
    background-color: rgba(6, 182, 212, 0.08);
    border-color: var(--p2-color);
}

.option-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.04);
    color: var(--text-secondary);
    flex-shrink: 0;
}

.p1-selector .player-option-card.selected .option-icon {
    background: var(--p1-color);
    color: #fff;
}

.p2-selector .player-option-card.selected .option-icon {
    background: var(--p2-color);
    color: #fff;
}

.option-details {
    display: flex;
    flex-direction: column;
    gap: 2px;
    min-width: 0;
}

.option-label {
    font-size: 13.5px;
    font-weight: 600;
}

.option-desc {
    display: none;
}

.ai-strength {
    flex-shrink: 0;
    margin-left: auto;
    padding: 5px 9px;
    border: none;
    border-radius: 6px;
    font-size: 9px;
    font-weight: 700;
    line-height: 1;
    letter-spacing: 0.07em;
    text-transform: uppercase;
    white-space: nowrap;
}

.ai-strength-weak,
.ai-strength-strong {
    color: #fff;
    background: var(--accent-color);
}

.vs-divider {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.vs-divider span {
    font-size: 11px;
    font-weight: 700;
    color: #fff;
    background-color: var(--accent-color);
    border: 1px solid var(--accent-color);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.settings-inactive {
    opacity: 0.35;
    pointer-events: none;
}

.extra-settings {
    display: flex;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 18px;
    margin-bottom: 20px;
    width: 100%;
}

.extra-settings .control-group {
    flex: 1 1 260px;
    min-width: min(100%, 260px);
    margin-bottom: 0;
    width: 100%;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 8px;
    gap: 8px;
}

.control-group label.label-with-tooltip {
    justify-content: flex-start;
}

.range-value {
    margin-left: auto;
    color: var(--accent-color);
    font-variant-numeric: tabular-nums;
}

.tooltip-trigger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    border: 1px solid var(--card-border);
    background: #334155;
    color: var(--text-primary);
    cursor: pointer;
    padding: 0;
    flex-shrink: 0;
}

.tooltip-trigger:focus-visible,
.tooltip-trigger.is-tooltip-open {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

.control-group input[type="number"] {
    width: 100%;
    padding: 12px;
    background-color: #111827;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    color: var(--text-primary);
    outline: none;
    font-family: inherit;
    font-size: 14px;
}

.control-group input[type="number"]:focus {
    border-color: var(--accent-color);
}

input[type="range"] {
    width: 100%;
    height: 48px;
    margin: 0;
    display: block;
    accent-color: var(--accent-color);
}

/* Game layout */
.match-board-view {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 40px;
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    animation: fadeIn 0.4s ease;
}

.sidebar-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 380px;
    flex-shrink: 0;
}

.game-sidebar {
    display: flex;
    flex-direction: column;
}

.sidebar-title {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 18px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 10px;
}

.status-cards-vert {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 0;
}

.player-turn-boxes {
    display: flex;
    flex-direction: column;
    gap: 10px;
    width: 100%;
}

.player-card {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    background-color: #111827;
    border: 2px solid var(--card-border);
    border-radius: 12px;
    padding: 12px 14px;
    transition: border-color 0.25s ease, background-color 0.25s ease, opacity 0.25s ease, box-shadow 0.25s ease;
    opacity: 0.5;
    width: 100%;
}

.player-card-details {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 12px;
    min-width: 0;
}

.player-card-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 3px;
    min-width: 0;
}

.player-card .player-name {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.player-type-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 12px;
    flex-shrink: 0;
    color: #fff;
}

#player1-card .player-type-icon {
    background: var(--p1-color);
}

#player2-card .player-type-icon {
    background: var(--p2-color);
}

.player-type-icon svg {
    width: 22px;
    height: 22px;
}

.player-type-label {
    font-size: 11px;
    color: var(--text-secondary);
    line-height: 1.3;
}

.player-card .player-status-text {
    font-size: 11px;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    font-weight: 600;
    white-space: nowrap;
}

.player-card.active {
    opacity: 1;
}

#player1-card.active {
    border-color: var(--p1-color);
    box-shadow: 0 0 0 1px rgba(225, 29, 72, 0.25);
    background-color: rgba(225, 29, 72, 0.1);
}

#player1-card.active .player-status-text {
    color: var(--p1-color);
}

#player2-card.active {
    border-color: var(--p2-color);
    box-shadow: 0 0 0 1px rgba(6, 182, 212, 0.25);
    background-color: rgba(6, 182, 212, 0.1);
}

#player2-card.active .player-status-text {
    color: var(--p2-color);
}

.player-card.result-won {
    opacity: 1;
}

.player-card.result-lost {
    opacity: 1;
}

.player-card.result-draw {
    opacity: 1;
}

#player1-card.result-won .player-status-text,
#player2-card.result-won .player-status-text {
    color: #34d399;
}

#player1-card.result-lost .player-status-text,
#player2-card.result-lost .player-status-text {
    color: #f87171;
}

#player1-card.result-draw .player-status-text,
#player2-card.result-draw .player-status-text {
    color: var(--text-secondary);
}

.match-stat-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    width: 100%;
}

.status-card {
    background-color: #111827;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    padding: 12px;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.card-label {
    font-size: 10px;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.card-value {
    font-size: 18px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1.1;
}

.card-value-row {
    display: flex;
    align-items: baseline;
    gap: 8px;
    flex-wrap: wrap;
}

.turn-clock {
    font-size: 12px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
    white-space: nowrap;
}

.turn-clock.p1 {
    color: var(--p1-color);
}

.turn-clock.p2 {
    color: var(--p2-color);
}

.token {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    display: inline-block;
    flex-shrink: 0;
}

.token-p1-small { background-color: var(--p1-color); }
.token-p2-small { background-color: var(--p2-color); }

/* Board */
.board-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    justify-content: center;
    min-width: 0;
    max-width: 100%;
    overflow: hidden;
}

.board-container {
    padding: 16px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    position: relative;
    border-radius: 20px;
    height: 100%;
    gap: 8px;
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}

.board-toolbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: min(
        100%,
        calc(7 * var(--cell-size) + 6 * var(--board-gap) + 2 * var(--board-padding))
    );
    margin-bottom: 4px;
}

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

.board-audio-controls {
    display: flex;
    align-items: center;
    border: 1px solid var(--card-border);
    border-radius: 12px;
    background-color: rgba(30, 41, 59, 0.7);
}

.board-audio-controls .icon-btn {
    border: 0;
    border-radius: 0;
    background: transparent;
}

.board-audio-controls .icon-btn:first-child {
    border-radius: 11px 0 0 11px;
}

.board-audio-controls .icon-btn:last-child {
    border-left: 1px solid var(--card-border);
    border-radius: 0 11px 11px 0;
}

.board-audio-controls .icon-btn:focus-visible {
    outline-offset: -3px;
}

.board-audio-controls .icon-btn.is-muted {
    color: #f87171;
    background: rgba(248, 113, 113, 0.1);
}

.drop-indicators {
    display: grid;
    grid-template-columns: repeat(7, var(--cell-size));
    gap: var(--board-gap);
    width: fit-content;
}

.indicator {
    height: 12px;
    position: relative;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Top-of-column hover rings removed; landing-cell preview handles aim */

.connect4-board {
    display: grid;
    grid-template-rows: repeat(6, var(--cell-size));
    grid-template-columns: repeat(7, var(--cell-size));
    gap: var(--board-gap);
    background-color: var(--board-bg);
    border: 3px solid var(--board-border);
    border-radius: 20px;
    padding: var(--board-padding);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.45);
    overflow: hidden;
    max-width: 100%;
    cursor: pointer;
}

.board-cell {
    width: var(--cell-size);
    height: var(--cell-size);
    background-color: var(--slot-bg);
    border-radius: 50%;
    position: relative;
    box-shadow: inset 0 3px 6px rgba(0, 0, 0, 0.65);
    display: flex;
    justify-content: center;
    align-items: center;
    cursor: pointer;
    z-index: 1;
}

.board-cell.highlighted-column {
    background-color: rgba(255, 255, 255, 0.03);
}

.board-disc {
    width: var(--disc-size);
    height: var(--disc-size);
    border-radius: 50%;
    position: absolute;
    z-index: 2;
}

.board-disc.dropping {
    animation: dropDisc 0.45s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

.board-disc.p1 {
    background-color: var(--p1-color);
    box-shadow: inset 0 -3px 8px rgba(0, 0, 0, 0.4);
}

.board-disc.p2 {
    background-color: var(--p2-color);
    box-shadow: inset 0 -3px 8px rgba(0, 0, 0, 0.4);
}

/* Keep each player's latest move solid; only its dotted marker glimmers. */
.board-disc.last-move:not(.dropping)::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: calc(var(--cell-size) + 2px);
    height: calc(var(--cell-size) + 2px);
    transform: translate(-50%, -50%);
    border: 2.5px dashed currentColor;
    border-radius: 50%;
    pointer-events: none;
    z-index: 3;
    animation: lastMoveMarkerGlimmer 1.8s ease-in-out infinite;
}

.board-disc.last-move.p1 {
    color: var(--p1-color);
}

.board-disc.last-move.p2 {
    color: var(--p2-color);
}

@keyframes lastMoveMarkerGlimmer {
    0%, 100% {
        opacity: 0.45;
        filter: drop-shadow(0 0 0 currentColor);
    }
    50% {
        opacity: 1;
        filter: drop-shadow(0 0 5px currentColor);
    }
}

/* Landing-slot hover preview (where the disc will drop) */
.board-cell.drop-preview::after {
    content: '';
    position: absolute;
    width: var(--disc-size);
    height: var(--disc-size);
    border-radius: 50%;
    border: 2.5px dashed currentColor;
    opacity: 0.9;
    pointer-events: none;
    z-index: 3;
}

.board-cell.drop-preview.p1 {
    color: var(--p1-color);
}

.board-cell.drop-preview.p2 {
    color: var(--p2-color);
}

.board-cell.drop-preview.p1::after {
    background: rgba(225, 29, 72, 0.18);
}

.board-cell.drop-preview.p2::after {
    background: rgba(6, 182, 212, 0.18);
}

@keyframes dropDisc {
    0% { transform: translateY(-400px); opacity: 0; }
    60% { transform: translateY(0); opacity: 1; }
    85% { transform: translateY(-8px); }
    100% { transform: translateY(0); opacity: 1; }
}

.winner-card {
    text-align: center;
    padding: 28px 24px;
    animation: slideUpPop 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}

.winner-heading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    margin-bottom: 10px;
}

.winner-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    flex-shrink: 0;
}

.winner-icon svg {
    display: block;
    width: 24px;
    height: 24px;
}

.winner-card h2 {
    font-size: 24px;
    font-weight: 700;
    margin: 0;
    line-height: 1.2;
}

.winner-card p {
    font-size: 14px;
    margin: 0 auto 24px;
    color: var(--text-secondary);
    line-height: 1.45;
    max-width: 32ch;
}

.modal-buttons {
    display: flex;
    justify-content: stretch;
    align-items: stretch;
    gap: 10px;
    flex-wrap: wrap;
    width: 100%;
}

.modal-buttons .btn {
    flex: 1 1 140px;
    min-width: min(100%, 140px);
}

@keyframes winningPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.06); }
    100% { transform: scale(1); }
}

.winning-cell .board-disc {
    border: 3px solid #ffffff;
    animation: winningPulse 1.2s infinite ease-in-out;
}

.winning-cell .board-disc.last-move {
    opacity: 1;
}

@keyframes bouncePop {
    0% { transform: scale(0); opacity: 0; }
    70% { transform: scale(1.12); }
    100% { transform: scale(1); opacity: 1; }
}

@keyframes slideUpPop {
    0% { transform: translateY(16px) scale(0.96); opacity: 0; }
    100% { transform: translateY(0) scale(1); opacity: 1; }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Subtle footer */
footer {
    padding: 14px 8% 20px;
    text-align: center;
    border-top: 1px solid rgba(51, 65, 85, 0.35);
}

footer .members {
    font-size: 12px;
    color: var(--text-muted);
    letter-spacing: 0.04em;
}

/* Desktop: keep toolbar actions spanning board width */
@media (min-width: 901px) {
    .board-toolbar {
        width: 100%;
    }
}

@media (max-width: 900px) {
    :root {
        --board-gap: 5px;
        --board-padding: 10px;
        /* Tighter gutter so phone cells can grow */
        --board-gutter: calc(8vw + 20px);
        --cell-size: min(68px, calc((100vw - var(--board-gutter) - var(--board-frame)) / 7));
        --disc-size: calc(var(--cell-size) * 0.82);
    }

    header {
        padding: 14px 4%;
    }

    .container {
        padding: 20px 4% 28px;
    }

    .match-board-view {
        flex-direction: column;
        align-items: center;
        gap: 16px;
        max-width: 100%;
    }

    .sidebar-panel,
    .board-panel {
        width: 100%;
        max-width: min(520px, 100%);
    }

    .sidebar-panel {
        display: flex;
        flex-direction: column;
        gap: 12px;
    }

    .sidebar-title {
        display: none;
    }

    .game-sidebar {
        padding: 14px;
    }

    .status-cards-vert {
        margin-bottom: 0;
    }

    /* Keep result card in flow above the board so both stay reachable */
    #winner-modal:not(.hidden) {
        width: 100%;
        max-width: min(520px, 100%);
    }

    .board-container {
        width: 100%;
        padding: 12px 10px 14px;
    }

    .board-toolbar {
        width: 100%;
        max-width: 100%;
        padding-inline: 0;
        box-sizing: border-box;
    }

    .connect4-board,
    .drop-indicators {
        margin-inline: auto;
    }
}

@media (max-width: 768px) {
    .player-selectors {
        flex-direction: column;
        gap: 16px;
    }

    .vs-divider {
        margin: 0;
    }

    .vs-divider span {
        width: 32px;
        height: 32px;
        font-size: 10px;
    }
}

@media (max-width: 500px) {
    :root {
        --board-gap: 4px;
        --board-padding: 8px;
        --board-gutter: calc(8vw + 16px);
        --board-frame: calc((2 * var(--board-padding)) + 4px + (6 * var(--board-gap)));
        --cell-size: min(58px, calc((100vw - var(--board-gutter) - var(--board-frame)) / 7));
        --disc-size: calc(var(--cell-size) * 0.8);
    }

    header {
        padding: 12px 4%;
    }

    .logo h1 {
        font-size: 18px;
    }

    .container {
        padding: 14px 4% 24px;
    }

    .extra-settings {
        flex-direction: column;
        flex-wrap: nowrap;
        gap: 12px;
        align-items: stretch;
    }

    .extra-settings .control-group {
        flex: 1 1 100%;
        min-width: 100%;
        width: 100%;
    }

    .player-select-trigger,
    .player-option-card {
        padding: 10px 12px;
    }

    .match-stat-row {
        gap: 8px;
    }

    .status-card {
        padding: 10px;
    }

    .card-value {
        font-size: 16px;
    }

    .player-card {
        padding: 10px 12px;
    }

    .player-card .player-status-text {
        font-size: 10px;
    }

    .board-container {
        padding: 10px 8px 12px;
        border-radius: 16px;
    }

    .board-toolbar {
        max-width: 100%;
        width: 100%;
    }

    .connect4-board {
        border-radius: 14px;
        border-width: 2px;
    }

    .results-panel {
        padding: 18px 14px;
        max-height: 92dvh;
    }

    .winner-card {
        padding: 24px 18px;
    }

    .modal-buttons .btn {
        flex-basis: 100%;
        width: 100%;
    }
}

/* Evaluation modal */
.results-overlay {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(2, 6, 23, 0.72);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    overflow-y: auto;
}

.results-panel {
    width: min(920px, 100%);
    max-height: 90dvh;
    overflow-y: auto;
    padding: 28px;
    animation: slideUpPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.github-panel {
    width: min(560px, 100%);
    padding: 24px;
    animation: slideUpPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.github-preview {
    display: block;
    width: 100%;
    aspect-ratio: 1200 / 630;
    object-fit: cover;
    border-radius: 14px;
    border: 1px solid var(--card-border);
    margin: 10px 0 20px;
}

.github-actions {
    width: 100%;
}

.github-actions .btn,
.results-actions .btn {
    display: block;
    width: 100%;
}

@media (max-width: 500px) {
    .github-panel {
        padding: 18px;
    }

    .github-preview {
        margin: 6px 0 16px;
    }
}

.modal-title-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    margin-bottom: 10px;
}

.modal-title-row h2 {
    font-size: 22px;
    font-weight: 600;
    margin: 0;
    line-height: 1.2;
}

.results-lead {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.45;
    margin-bottom: 16px;
}

.results-lead-full {
    max-width: none;
    width: 100%;
}

.strength-order {
    margin-bottom: 16px;
    padding: 14px 16px;
    border-radius: 16px;
    border: 1px solid var(--card-border);
    background: #111827;
}

.strength-order-header {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    justify-content: space-between;
    gap: 6px 12px;
    margin-bottom: 12px;
}

.strength-order-label {
    font-size: 12px;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    color: var(--accent-color);
}

.strength-order-note {
    font-size: 12px;
    color: var(--text-secondary);
}

.strength-ladder {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
}

.strength-step {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: 999px;
    border: 1px solid var(--card-border);
    background: rgba(15, 23, 42, 0.65);
}

.strength-step-strong {
    border-color: rgba(37, 99, 235, 0.45);
    background: rgba(37, 99, 235, 0.14);
}

.strength-icon {
    display: inline-flex;
    color: var(--accent-color);
}

.strength-icon svg {
    display: block;
}

.strength-name {
    font-size: 13px;
    font-weight: 600;
    color: var(--text-primary);
}

.strength-rank {
    font-size: 11px;
    color: var(--text-secondary);
}

.strength-arrow {
    display: inline-flex;
    color: var(--text-secondary);
}

.results-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px 10px;
    margin-bottom: 16px;
    font-size: 12px;
    line-height: 1.45;
}

.meta-item {
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.meta-item > svg {
    flex-shrink: 0;
    color: var(--accent-color);
    opacity: 0.9;
}

.meta-key {
    color: var(--text-secondary);
    opacity: 0.65;
    margin-right: 2px;
}

.meta-val {
    color: var(--text-primary);
    opacity: 0.95;
}

.meta-sep {
    color: var(--text-muted);
    opacity: 0.4;
}

.eval-switcher {
    margin-bottom: 16px;
}

.eval-switcher-label {
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-color);
    margin-bottom: 8px;
}

.eval-tabs {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 4px;
    padding: 4px;
    border-radius: 14px;
    background: #0b1220;
    border: 1px solid #475569;
}

.eval-tab {
    font-family: inherit;
    font-size: 12px;
    font-weight: 600;
    color: var(--text-secondary);
    background: transparent;
    border: 1px solid transparent;
    border-radius: 10px;
    padding: 10px 8px;
    cursor: pointer;
    text-align: center;
    line-height: 1.25;
    transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}

.eval-tab:hover,
.eval-tab:active {
    color: var(--text-primary);
    background: rgba(148, 163, 184, 0.12);
}

.eval-tab.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: #f8fafc;
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.35);
}

.eval-tab:active {
    transform: scale(0.98);
}

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

.results-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 20px;
}

.eval-compare {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
}

.eval-agent {
    background: #111827;
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.eval-agent-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.eval-agent-title {
    display: flex;
    align-items: center;
    gap: 10px;
    min-width: 0;
}

.eval-agent-icon {
    width: 34px;
    height: 34px;
    border-radius: 10px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    background: rgba(37, 99, 235, 0.14);
    color: var(--accent-color);
}

.eval-agent.alt .eval-agent-icon {
    background: rgba(6, 182, 212, 0.14);
    color: var(--p2-color);
}

.eval-agent-icon svg {
    width: 18px;
    height: 18px;
    display: block;
}

.eval-agent-head h3 {
    font-size: 15px;
    font-weight: 600;
}

.eval-winrate {
    font-size: 28px;
    font-weight: 700;
    font-variant-numeric: tabular-nums;
    line-height: 1;
    color: var(--accent-color);
}

.eval-agent.alt .eval-winrate {
    color: var(--p2-color);
}

.eval-bar-track {
    height: 10px;
    border-radius: 999px;
    background: #0f172a;
    overflow: hidden;
}

.eval-bar-fill {
    height: 100%;
    border-radius: inherit;
    background: var(--accent-color);
}

.eval-agent.alt .eval-bar-fill {
    background: var(--p2-color);
}

.eval-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
}

.eval-stat {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.eval-stat span {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--text-secondary);
}

.eval-stat strong {
    font-size: 13px;
    font-variant-numeric: tabular-nums;
}

.results-actions {
    width: 100%;
}

@media (min-width: 640px) {
    .eval-compare {
        grid-template-columns: 1fr 1fr;
    }
}

/* Sound settings panel */
.sound-panel {
    width: min(420px, 100%);
    padding: 24px;
    animation: slideUpPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.sound-divider {
    height: 1px;
    background: rgba(51, 65, 85, 0.7);
    margin: 14px 0;
}

.sound-body {
    display: flex;
    flex-direction: column;
    gap: 0;
    transition: opacity 0.2s ease;
}

.toggle-switch {
    position: relative;
    width: 46px;
    height: 26px;
    border-radius: 999px;
    border: none;
    background: #334155;
    cursor: pointer;
    transition: background-color 0.2s ease;
    flex-shrink: 0;
    padding: 0;
}

.toggle-switch::after {
    content: '';
    position: absolute;
    top: 3px;
    left: 3px;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: #f8fafc;
    transition: transform 0.2s ease;
}

.toggle-switch[aria-checked="true"]::after {
    transform: translateX(20px);
}

.toggle-switch.toggle-enable[aria-checked="true"] {
    background: var(--accent-color);
}

.sound-body.is-disabled {
    opacity: 0.38;
    pointer-events: none;
}

.sound-section {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.sound-subsettings {
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding-left: 0;
    transition: opacity 0.2s ease;
}

.sound-subsettings.is-disabled {
    opacity: 0.38;
    pointer-events: none;
}

.sound-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 10px 0;
}

.sound-row-label {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-primary);
}

.sound-row-label svg {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.sound-row input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--accent-color);
}

.sound-slider.bare {
    padding: 2px 0 8px;
}

.sound-slider label {
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 4px;
}

.sound-slider input[type="range"] {
    height: 32px;
}

/* Lobby Match Modes / Agents explanation */
.lobby-agents-section {
    margin-top: 36px;
    padding: 32px 0 0 0;
    border-top: 1px solid var(--card-border);
}

.lobby-agents-header-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    width: 100%;
}

.lobby-agents-header-row h3 {
    font-size: 24px;
    font-weight: 600;
    margin: 0;
    letter-spacing: -0.01em;
}

.agent-cards-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 24px;
    width: 100%;
}

@media (max-width: 1024px) {
    .agent-cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    .agent-cards-grid {
        grid-template-columns: 1fr;
    }
}

.agent-info-card {
    background-color: rgba(17, 24, 39, 0.7);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 26px 20px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    align-items: center;
    text-align: center;
    transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.agent-info-card:hover {
    transform: translateY(-2px);
    border-color: #475569;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.agent-info-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
}

.agent-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border-radius: 12px;
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-secondary);
}

.agent-icon svg {
    width: 24px;
    height: 24px;
}

.random-icon { color: #f59e0b; background: rgba(245, 158, 11, 0.1); }
.rule-icon { color: #10b981; background: rgba(16, 185, 129, 0.1); }
.minimax-icon { color: var(--accent-color); background: rgba(37, 99, 235, 0.1); }
.local-icon { color: var(--p1-color); background: rgba(225, 29, 72, 0.1); }

.agent-info-card h4 {
    font-size: 16px;
    font-weight: 600;
}

.agent-info-card p {
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.5;
    margin: 0;
}

.lobby-agents-illustration {
    display: none;
}

.lobby-agents-illustration svg {
    width: 100%;
    max-width: 320px;
    height: auto;
    filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.2));
}

.icon-text-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 18px;
    font-size: 13.5px;
    font-weight: 550;
}

/* How to Play Modal Styling */
.how-to-play-panel {
    width: min(840px, 100%);
    max-height: 90dvh;
    overflow-y: auto;
    padding: 28px;
    animation: slideUpPop 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.how-to-play-body {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 28px;
    margin: 22px 0 24px;
    align-items: stretch;
}

.how-to-play-stepper-row {
    width: 100%;
    margin-bottom: 8px;
}

.stepper-horizontal {
    position: relative;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0 48px;
    margin-top: 10px;
    margin-bottom: 24px;
}

.stepper-horizontal-line-bg {
    position: absolute;
    left: 68px;
    right: 68px;
    top: 19px; /* Half of circle size (38px) */
    height: 4px;
    background-color: rgba(255, 255, 255, 0.08);
    border-radius: 2px;
    z-index: 1;
}

.stepper-horizontal-line-progress {
    height: 100%;
    width: 0%;
    background-color: var(--accent-color);
    border-radius: 2px;
    transition: width 0.4s ease;
}

.step-dot {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    z-index: 2;
}

.step-number {
    width: 38px;
    height: 38px;
    border-radius: 50%;
    background-color: #1e293b;
    border: 2.5px solid rgba(255, 255, 255, 0.15);
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color 0.4s ease, border-color 0.4s ease, color 0.4s ease, box-shadow 0.4s ease;
}

.step-dot.active .step-number,
.step-dot.completed .step-number {
    background-color: var(--accent-color);
    border-color: var(--accent-color);
    color: #ffffff;
    box-shadow: 0 0 12px rgba(37, 99, 235, 0.35);
}

.step-dot-label {
    font-size: 13.5px;
    font-weight: 550;
    color: var(--text-secondary);
    transition: color 0.3s ease;
    margin-top: 8px;
    text-align: center;
    white-space: nowrap;
}

.step-dot.active .step-dot-label {
    color: #ffffff;
    font-weight: 600;
}

.step-dot.completed .step-dot-label {
    color: var(--text-primary);
}

.how-to-play-info {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    padding: 12px 16px;
    gap: 24px;
}

.step-panels-container {
    width: 100%;
}

.step-panel {
    display: none;
    flex-direction: column;
    gap: 12px;
    animation: fadeIn 0.3s ease;
}

.step-panel.active {
    display: flex;
}

.step-panel h3 {
    font-size: 22px;
    font-weight: 600;
    color: #ffffff;
    margin: 0;
}

.step-panel p {
    font-size: 14.5px;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

.how-to-play-visual {
    background-color: rgba(17, 24, 39, 0.6);
    border: 1px solid var(--card-border);
    border-radius: 16px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
}

.demo-board {
    --demo-cell-size: clamp(24px, 4vw, 32px);
    --demo-gap: 5px;
    --demo-disc-size: calc(var(--demo-cell-size) * 0.83);
    display: grid;
    grid-template-rows: repeat(6, var(--demo-cell-size));
    grid-template-columns: repeat(7, var(--demo-cell-size));
    gap: var(--demo-gap);
    background-color: var(--board-bg);
    border: 3.5px solid var(--board-border);
    border-radius: 12px;
    padding: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
    overflow: hidden;
    position: relative;
}

.demo-cell {
    width: var(--demo-cell-size);
    height: var(--demo-cell-size);
    background-color: var(--slot-bg);
    border-radius: 50%;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.65);
    display: flex;
    justify-content: center;
    align-items: center;
}

.demo-disc {
    width: var(--demo-disc-size);
    height: var(--demo-disc-size);
    border-radius: 50%;
    position: absolute;
    z-index: 2;
}

.demo-disc.dropping {
    animation: demoDropDisc 0.4s cubic-bezier(0.25, 1, 0.5, 1) forwards;
}

.demo-disc.p1 {
    background-color: var(--p1-color);
    box-shadow: inset 0 -2px 5px rgba(0, 0, 0, 0.4);
}

.demo-disc.p2 {
    background-color: var(--p2-color);
    box-shadow: inset 0 -2px 5px rgba(0, 0, 0, 0.4);
}

.demo-cell.winning-cell .demo-disc {
    animation: winCellGlow 0.5s ease-in-out infinite alternate;
}

.demo-caption {
    font-size: 12.5px;
    color: var(--text-secondary);
    text-align: center;
    min-height: 36px;
    line-height: 1.4;
    text-wrap: balance;
    display: flex;
    align-items: center;
    justify-content: center;
}

.how-to-play-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}

@keyframes demoDropDisc {
    0% { transform: translateY(-240px); opacity: 0; }
    60% { transform: translateY(0); opacity: 1; }
    80% { transform: translateY(-6px); }
    100% { transform: translateY(0); opacity: 1; }
}

@keyframes winCellGlow {
    0% {
        box-shadow: 0 0 0 transparent;
        filter: brightness(1);
    }
    100% {
        box-shadow: 0 0 10px currentColor;
        filter: brightness(1.35);
    }
}

/* Step list mobile layout */
@media (max-width: 768px) {
    .how-to-play-body {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    /* Animation above step title/subtitle on phone */
    .how-to-play-visual {
        order: -1;
    }
    .how-to-play-info {
        order: 1;
    }
    .stepper-horizontal {
        padding: 0 16px;
    }
    .stepper-horizontal-line-bg {
        left: 36px;
        right: 36px;
    }
    .step-dot-label {
        font-size: 10px;
    }
}