/* ==========================================================================
   NumberLink - Modern Sleek Stylesheet
   ========================================================================== */

:root {
    --font-main: 'Outfit', system-ui, -apple-system, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    /* Theme: Dark (default) */
    --bg-main: #0b0f19;
    --bg-surface: rgba(17, 24, 39, 0.75);
    --bg-card: rgba(22, 30, 49, 0.9);
    --bg-subtle: rgba(255, 255, 255, 0.05);
    --border-color: rgba(255, 255, 255, 0.1);
    --border-glow: rgba(0, 210, 255, 0.3);
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --accent: #00d2ff;
    --accent-glow: rgba(0, 210, 255, 0.25);
    --accent-secondary: #ff2a85;
    --success: #00e676;
    --shadow-card: 0 12px 32px -4px rgba(0, 0, 0, 0.5), 0 4px 12px -2px rgba(0, 0, 0, 0.3);
    --canvas-bg: #090d16;
}

[data-theme="light"] {
    --bg-main: #f1f5f9;
    --bg-surface: rgba(255, 255, 255, 0.85);
    --bg-card: #ffffff;
    --bg-subtle: rgba(0, 0, 0, 0.04);
    --border-color: rgba(0, 0, 0, 0.09);
    --border-glow: rgba(0, 180, 216, 0.3);
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --accent: #0088cc;
    --accent-glow: rgba(0, 136, 204, 0.15);
    --accent-secondary: #d81b60;
    --success: #16a34a;
    --shadow-card: 0 10px 25px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --canvas-bg: #ffffff;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-main);
    overflow-x: hidden;
    user-select: none;
    -webkit-user-select: none;
}

.mono {
    font-family: var(--font-mono);
}

/* App Container */
.app-container {
    max-width: 680px;
    margin: 0 auto;
    height: 100vh;
    display: flex;
    flex-direction: column;
    padding: 12px 16px;
    gap: 12px;
}

/* Header */
.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 8px 14px;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-card);
    flex-wrap: wrap;
    gap: 10px;
}

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

.brand-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-subtle);
    padding: 6px;
    border-radius: 10px;
    border: 1px solid var(--border-color);
}

.brand-title {
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    background: linear-gradient(135deg, #00d2ff, #ff2a85);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.brand-subtitle {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 500;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.control-group {
    display: flex;
    align-items: center;
    gap: 5px;
}

.control-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.styled-select {
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 6px 10px;
    border-radius: 8px;
    font-family: var(--font-main);
    font-size: 0.8rem;
    font-weight: 600;
    cursor: pointer;
    outline: none;
    transition: all 0.2s ease;
}

.styled-select:hover, .styled-select:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 2px var(--accent-glow);
}

.header-buttons {
    display: flex;
    align-items: center;
    gap: 4px;
}

.icon-btn {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    width: 32px;
    height: 32px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 0.95rem;
    transition: all 0.2s;
}

.icon-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
    transform: translateY(-1px);
}

/* HUD Bar */
.hud-bar {
    display: grid;
    grid-template-columns: repeat(3, 1fr) 2fr 1fr;
    gap: 8px;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 14px;
    align-items: center;
}

.hud-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    gap: 2px;
}

.hud-label {
    font-size: 0.68rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.hud-value {
    font-size: 0.95rem;
    font-weight: 700;
    color: var(--text-primary);
}

.seed-badge {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 6px;
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.seed-badge:hover {
    color: var(--accent);
    border-color: var(--accent);
}

.hud-coverage {
    width: 100%;
}

.coverage-header {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 3px;
}

.progress-track {
    width: 100%;
    height: 6px;
    background: var(--bg-subtle);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border-color);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, #00d2ff, #00e676);
    border-radius: 4px;
    transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Game Arena */
.game-arena {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    min-height: 280px;
}

.canvas-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--canvas-bg);
    border: 1px solid var(--border-color);
    border-radius: 18px;
    padding: 10px;
    box-shadow: var(--shadow-card);
    transition: border-color 0.3s;
}

.canvas-wrapper:hover {
    border-color: var(--border-glow);
}

#game-canvas {
    display: block;
    touch-action: none;
    border-radius: 10px;
    cursor: crosshair;
}

/* Pairs Legend */
.pairs-legend-container {
    overflow-x: auto;
    padding: 2px 0;
}

.pairs-legend {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    flex-wrap: wrap;
}

.pair-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 3px 8px 3px 4px;
    background: var(--bg-surface);
    border: 1.5px solid var(--border-color);
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

.pair-pill:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.pair-pill.connected {
    background: rgba(0, 230, 118, 0.1);
}

.pill-dot {
    width: 22px;
    height: 22px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.75rem;
    font-weight: 800;
}

.pill-status {
    color: var(--text-muted);
    font-weight: 800;
    font-size: 0.85rem;
}

.pair-pill.connected .pill-status {
    color: var(--success);
}

/* Action Toolbar */
.action-toolbar {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    background: var(--bg-surface);
    backdrop-filter: blur(12px);
    padding: 8px 10px;
    border-radius: 16px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-card);
}

.tool-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    padding: 8px 4px;
    border-radius: 12px;
    cursor: pointer;
    font-family: var(--font-main);
    transition: all 0.2s ease;
}

.tool-icon {
    font-size: 1.15rem;
}

.tool-text {
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.3px;
}

.tool-btn:hover {
    background: var(--bg-card);
    border-color: var(--accent);
    transform: translateY(-2px);
}

.tool-btn:active {
    transform: translateY(0);
}

.tool-btn-primary {
    background: linear-gradient(135deg, #00d2ff, #0099ff);
    color: #ffffff;
    border: none;
    box-shadow: 0 4px 12px rgba(0, 153, 255, 0.35);
}

.tool-btn-primary:hover {
    background: linear-gradient(135deg, #26dcff, #1aa3ff);
    box-shadow: 0 6px 16px rgba(0, 153, 255, 0.5);
}

.tool-btn-accent {
    border-color: rgba(255, 193, 7, 0.4);
}

.tool-btn-accent:hover {
    border-color: #ffc107;
    background: rgba(255, 193, 7, 0.15);
}

/* Modals */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
    transition: opacity 0.25s ease, visibility 0.25s ease;
}

.modal.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.modal-backdrop {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(8px);
}

.modal-card {
    position: relative;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 24px;
    width: 100%;
    max-width: 420px;
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    transform: scale(1);
    transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.modal.hidden .modal-card {
    transform: scale(0.9);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 16px;
}

.modal-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
}

.modal-close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.6rem;
    cursor: pointer;
    line-height: 1;
}

.modal-close-btn:hover {
    color: var(--text-primary);
}

/* Win Modal Card */
.win-card {
    text-align: center;
    padding: 32px 24px;
}

.win-sparkle {
    font-size: 3rem;
    margin-bottom: 4px;
    animation: bounce 0.8s ease infinite alternate;
}

@keyframes bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-8px); }
}

.win-title {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: 6px;
    background: linear-gradient(135deg, #00d2ff, #00e676);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.win-stars {
    font-size: 2.2rem;
    color: #ffc107;
    margin-bottom: 20px;
    letter-spacing: 4px;
    text-shadow: 0 0 15px rgba(255, 193, 7, 0.6);
}

.win-stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
    margin-bottom: 20px;
}

.win-stat-box {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 10px;
    border-radius: 12px;
}

.win-stat-label {
    display: block;
    font-size: 0.72rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
}

.win-stat-val {
    font-family: var(--font-mono);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--text-primary);
}

.win-seed-wrapper {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 8px 12px;
    border-radius: 10px;
    margin-bottom: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
}

.win-seed-label {
    color: var(--text-muted);
}

.win-seed-code {
    font-family: var(--font-mono);
    color: var(--accent);
    font-weight: 700;
}

.modal-actions {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
}

.modal-btn {
    padding: 10px 18px;
    border-radius: 12px;
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.9rem;
    cursor: pointer;
    border: none;
    transition: all 0.2s ease;
    flex: 1;
}

.modal-btn-primary {
    background: linear-gradient(135deg, #00d2ff, #0088ff);
    color: #fff;
    box-shadow: 0 4px 14px rgba(0, 136, 255, 0.4);
}

.modal-btn-primary:hover {
    box-shadow: 0 6px 18px rgba(0, 136, 255, 0.6);
    transform: translateY(-2px);
}

.modal-btn-secondary {
    background: var(--bg-subtle);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

.modal-btn-secondary:hover {
    background: var(--bg-card);
    border-color: var(--text-secondary);
}

/* Forms */
.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 14px;
}

.form-row label {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.form-row input {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    padding: 8px 12px;
    border-radius: 8px;
    font-family: var(--font-mono);
    font-size: 0.9rem;
    width: 130px;
    text-align: right;
    outline: none;
    transition: border-color 0.2s;
}

.form-row input:focus {
    border-color: var(--accent);
}

/* Help Content */
.help-content {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.help-content p {
    margin-bottom: 12px;
}

.help-content ul {
    margin-left: 20px;
    margin-bottom: 14px;
}

.help-content li {
    margin-bottom: 6px;
}

.help-content h4 {
    color: var(--text-primary);
    margin-top: 14px;
    margin-bottom: 8px;
}

kbd {
    background: var(--bg-subtle);
    border: 1px solid var(--border-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--accent);
}

/* Responsive adjustments */
@media (max-width: 540px) {
    .app-container {
        padding: 8px 10px;
        gap: 8px;
    }

    .brand-subtitle {
        display: none;
    }

    .hud-bar {
        grid-template-columns: repeat(3, 1fr);
        row-gap: 6px;
    }

    .hud-coverage {
        grid-column: span 2;
    }

    .hud-seed {
        grid-column: span 1;
    }

    .tool-text {
        font-size: 0.65rem;
    }
}