/* ==========================================================================
   TETRIS PRO - MODERN VANILLA CSS STYLESHEET
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. COLOR THEMES & CSS CUSTOM PROPERTIES
   -------------------------------------------------------------------------- */
:root {
    /* Font Families */
    --font-main: 'Outfit', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Press Start 2P', monospace;

    /* Theme: Cyberpunk Neon (Default) */
    --bg-main: #0b0d19;
    --bg-gradient: radial-gradient(circle at 50% 20%, #1a1d36 0%, #080911 100%);
    --card-bg: rgba(22, 27, 46, 0.75);
    --card-border: rgba(0, 242, 254, 0.2);
    --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.5), inset 0 1px 0 rgba(255, 255, 255, 0.1);
    --text-color: #f1f5f9;
    --text-muted: #94a3b8;
    --accent-color: #00f2fe;
    --accent-secondary: #4facfe;
    --board-bg: #05070f;
    --board-grid: rgba(0, 242, 254, 0.08);

    /* Tetromino Default Colors */
    --color-i: #00f0f0; /* Cyan */
    --color-j: #0000f0; /* Blue */
    --color-l: #f0a000; /* Orange */
    --color-o: #f0f000; /* Yellow */
    --color-s: #00f000; /* Green */
    --color-t: #a000f0; /* Purple */
    --color-z: #f00000; /* Red */
    --ghost-color: rgba(255, 255, 255, 0.2);
}

/* Theme: Retro Game Boy */
[data-theme="classic"] {
    --bg-main: #8b956d;
    --bg-gradient: linear-gradient(135deg, #a4b282 0%, #758059 100%);
    --card-bg: #9bbc0f;
    --card-border: #306230;
    --card-shadow: 4px 4px 0px #0f380f;
    --text-color: #0f380f;
    --text-muted: #306230;
    --accent-color: #0f380f;
    --accent-secondary: #306230;
    --board-bg: #8bac0f;
    --board-grid: rgba(15, 56, 15, 0.15);

    --color-i: #0f380f;
    --color-j: #306230;
    --color-l: #0f380f;
    --color-o: #306230;
    --color-s: #0f380f;
    --color-t: #306230;
    --color-z: #0f380f;
    --ghost-color: rgba(48, 98, 48, 0.4);
}

/* Theme: Oscuro Moderno */
[data-theme="dark"] {
    --bg-main: #121214;
    --bg-gradient: radial-gradient(circle at 50% 50%, #1e1e24 0%, #0a0a0c 100%);
    --card-bg: #18181c;
    --card-border: #2a2a32;
    --card-shadow: 0 12px 24px rgba(0, 0, 0, 0.6);
    --text-color: #e4e4e7;
    --text-muted: #71717a;
    --accent-color: #6366f1;
    --accent-secondary: #818cf8;
    --board-bg: #101014;
    --board-grid: rgba(255, 255, 255, 0.05);

    --color-i: #38bdf8;
    --color-j: #6366f1;
    --color-l: #fb923c;
    --color-o: #facc15;
    --color-s: #4ade80;
    --color-t: #c084fc;
    --color-z: #f87171;
    --ghost-color: rgba(255, 255, 255, 0.15);
}

/* Theme: Synthwave 80s */
[data-theme="synthwave"] {
    --bg-main: #1a0933;
    --bg-gradient: linear-gradient(180deg, #2b1055 0%, #0f051d 100%);
    --card-bg: rgba(45, 16, 82, 0.7);
    --card-border: #ff2a85;
    --card-shadow: 0 0 20px rgba(255, 42, 133, 0.3);
    --text-color: #ffe5ec;
    --text-muted: #b388ff;
    --accent-color: #ff2a85;
    --accent-secondary: #05ffa1;
    --board-bg: #0e041a;
    --board-grid: rgba(255, 42, 133, 0.15);

    --color-i: #05ffa1;
    --color-j: #00bbf9;
    --color-l: #ff9e00;
    --color-o: #ffee32;
    --color-s: #390099;
    --color-t: #ff0054;
    --color-z: #ff5400;
    --ghost-color: rgba(255, 42, 133, 0.25);
}

/* Theme: Pastel Soft */
[data-theme="pastel"] {
    --bg-main: #181925;
    --bg-gradient: radial-gradient(circle at 50% 30%, #25283b 0%, #11121c 100%);
    --card-bg: rgba(36, 40, 61, 0.8);
    --card-border: rgba(255, 255, 255, 0.15);
    --card-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
    --text-color: #f7fafc;
    --text-muted: #a0aec0;
    --accent-color: #b8c0ff;
    --accent-secondary: #c8b6ff;
    --board-bg: #13141f;
    --board-grid: rgba(255, 255, 255, 0.05);

    --color-i: #9bf6ff;
    --color-j: #a0c4ff;
    --color-l: #ffd6a5;
    --color-o: #fdffb6;
    --color-s: #caffbf;
    --color-t: #bdb2ff;
    --color-z: #ffadad;
    --ghost-color: rgba(255, 255, 255, 0.2);
}

/* --------------------------------------------------------------------------
   2. GLOBAL RESET & BASE STYLES
   -------------------------------------------------------------------------- */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: var(--font-main);
    background-color: var(--bg-main);
    background: var(--bg-gradient);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow-x: hidden;
    padding: 20px;
    transition: background 0.4s ease, color 0.4s ease;
}

.app-container {
    width: 100%;
    max-width: 1100px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

/* Header */
.app-header {
    text-align: center;
}

.logo {
    font-family: var(--font-display);
    font-size: 2.2rem;
    letter-spacing: 3px;
    color: var(--text-color);
    text-shadow: 0 0 15px var(--accent-color);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.logo .badge {
    font-family: var(--font-main);
    font-size: 0.8rem;
    font-weight: 800;
    padding: 4px 10px;
    background: var(--accent-color);
    color: var(--bg-main);
    border-radius: 20px;
    letter-spacing: 1px;
}

/* Layout */
.main-layout {
    display: grid;
    grid-template-columns: 240px 1fr 260px;
    gap: 24px;
    align-items: start;
}

@media (max-width: 900px) {
    .main-layout {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
}

/* --------------------------------------------------------------------------
   3. CARD & PANEL STYLING
   -------------------------------------------------------------------------- */
.panel {
    display: flex;
    flex-direction: column;
    gap: 18px;
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    box-shadow: var(--card-shadow);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-radius: 16px;
    padding: 18px;
    transition: all 0.3s ease;
}

.card-title {
    font-size: 0.85rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    font-weight: 700;
    color: var(--text-muted);
    margin-bottom: 14px;
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 8px;
}

/* Stats Box */
.stats-card {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.stat-box {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: rgba(0, 0, 0, 0.2);
    padding: 10px 14px;
    border-radius: 10px;
    border: 1px solid rgba(255, 255, 255, 0.04);
}

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

.stat-value {
    font-family: var(--font-display);
    font-size: 1rem;
    color: var(--text-color);
}

.stat-value.highlight {
    color: var(--accent-color);
    text-shadow: 0 0 10px rgba(0, 242, 254, 0.4);
}

/* Mini Canvas Containers (Next/Hold) */
.mini-canvas-box {
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--board-bg);
    border-radius: 12px;
    padding: 10px;
    border: 1px solid var(--card-border);
}

.mini-canvas-box canvas {
    display: block;
}

/* Controls Guide List */
.controls-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 10px;
    font-size: 0.85rem;
}

.controls-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    color: var(--text-muted);
}

kbd {
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 2px 0 rgba(0, 0, 0, 0.5);
    border-radius: 5px;
    padding: 2px 7px;
    font-family: var(--font-main);
    font-size: 0.75rem;
    color: var(--text-color);
    font-weight: 600;
}

/* --------------------------------------------------------------------------
   4. BOARD SECTION & CANVAS OVERLAYS
   -------------------------------------------------------------------------- */
.board-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.board-wrapper {
    position: relative;
    background: var(--board-bg);
    border-radius: 20px;
    padding: 12px;
    border: 2px solid var(--card-border);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.7), 0 0 20px var(--card-border);
}

#tetris-canvas {
    display: block;
    border-radius: 12px;
    background-color: var(--board-bg);
}

/* Game Overlay */
.overlay {
    position: absolute;
    top: 12px;
    left: 12px;
    right: 12px;
    bottom: 12px;
    background: rgba(5, 7, 15, 0.88);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
    z-index: 10;
}

.overlay.active {
    opacity: 1;
    pointer-events: all;
}

.overlay-content {
    text-align: center;
    padding: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

#overlay-title {
    font-family: var(--font-display);
    font-size: 1.8rem;
    color: var(--accent-color);
    text-shadow: 0 0 15px var(--accent-color);
}

#overlay-subtitle {
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* Action Buttons */
.action-buttons {
    display: flex;
    gap: 12px;
    width: 100%;
    justify-content: center;
}

/* --------------------------------------------------------------------------
   5. BUTTONS & FORM INPUTS
   -------------------------------------------------------------------------- */
.btn {
    font-family: var(--font-main);
    font-weight: 700;
    font-size: 0.9rem;
    padding: 12px 20px;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-color) 0%, var(--accent-secondary) 100%);
    color: #05070f;
    box-shadow: 0 4px 15px rgba(0, 242, 254, 0.4);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 242, 254, 0.6);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.08);
    color: var(--text-color);
    border: 1px solid var(--card-border);
}

.btn-secondary:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.15);
    transform: translateY(-2px);
}

.btn-danger {
    background: rgba(240, 0, 0, 0.15);
    color: #ff5252;
    border: 1px solid rgba(240, 0, 0, 0.3);
}

.btn-danger:hover:not(:disabled) {
    background: rgba(240, 0, 0, 0.3);
    transform: translateY(-2px);
}

.btn-large {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: 14px;
}

.btn-small {
    padding: 8px 14px;
    font-size: 0.8rem;
    width: 100%;
    margin-top: 10px;
}

.btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* Settings Form Controls */
.settings-card {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.setting-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.setting-row {
    display: flex;
    gap: 12px;
}

.setting-group.half {
    flex: 1;
}

.label-with-value {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
}

.range-val {
    font-size: 0.8rem;
    font-weight: 700;
    color: var(--accent-color);
}

.form-control {
    background: rgba(0, 0, 0, 0.25);
    border: 1px solid var(--card-border);
    color: var(--text-color);
    padding: 9px 12px;
    border-radius: 8px;
    font-family: var(--font-main);
    font-size: 0.85rem;
    outline: none;
    transition: border-color 0.2s ease;
}

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

/* Custom Range Input */
.form-range {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: rgba(255, 255, 255, 0.1);
    outline: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--accent-color);
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-color);
    transition: transform 0.1s ease;
}

.form-range::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

/* Toggle Switch Checkbox */
.checkbox-group {
    flex-direction: row;
    align-items: center;
    gap: 10px;
}

.toggle-switch {
    position: relative;
    display: inline-block;
    width: 38px;
    height: 20px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(255, 255, 255, 0.15);
    transition: .3s;
    border-radius: 20px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--accent-color);
}

input:checked + .slider:before {
    transform: translateX(18px);
}

.toggle-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}