/*
   MODERN TIC-TAC-TOE | STYLE.CSS PART 1
   Core, Variables, Layout & Grid Fix
*/

:root {
    /* --- COLORS --- */
    --bg-app: #f2f4f8;
    --bg-panel: rgba(255, 255, 255, 0.75);
    --bg-card: #ffffff;

    --text-primary: #0f172a;
    --text-secondary: #64748b;

    --accent-primary: #6366f1;
    --accent-primary-soft: rgba(99, 102, 241, 0.1);

    /* Player Colors */
    --color-x: #6366f1;
    --color-x-soft: #e0e7ff;
    --color-o: #ec4899;
    --color-o-soft: #fce7f3;

    /* Animation/Feel */
    --radius-lg: 24px;
    --radius-md: 16px;
    --shadow-soft: 0 10px 30px -5px rgba(0, 0, 0, 0.05);
    --backdrop: blur(20px);
    --ease: cubic-bezier(0.25, 1, 0.5, 1);
}

[data-theme="dark"] {
    --bg-app: #0b0f17;
    --bg-panel: rgba(30, 41, 59, 0.65);
    --bg-card: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Plus Jakarta Sans', sans-serif; -webkit-tap-highlight-color: transparent; }

body {
    background: var(--bg-app);
    color: var(--text-primary);
    height: 100vh; overflow: hidden;
    transition: background 0.5s ease;
}

/* --- BACKGROUND --- */
.aurora-bg { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.aurora-blob {
    position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.5;
    animation: float 10s infinite alternate;
}
.blob-1 { top: -10%; left: -10%; width: 60vw; height: 60vw; background: #818cf8; }
.blob-2 { bottom: -10%; right: -10%; width: 50vw; height: 50vw; background: #f472b6; animation-delay: -5s; }
.noise-overlay { position: absolute; inset: 0; opacity: 0.03; background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)' opacity='1'/%3E%3C/svg%3E"); }


/* --- LAYOUT --- */
.app-wrapper {
    display: flex; flex-direction: column;
    height: 100%; padding: 20px;
    max-width: 500px; margin: 0 auto;
    gap: 20px;
}

/* HEADER (HUD) */
.pro-header {
    display: grid; grid-template-columns: 1fr auto 1fr;
    background: var(--bg-panel); backdrop-filter: var(--backdrop); -webkit-backdrop-filter: var(--backdrop);
    padding: 10px 16px; border-radius: 50px;
    align-items: center; border: 1px solid rgba(255,255,255,0.1);
}

.header-section { display: flex; align-items: center; gap: 10px; }
.header-section.center { justify-content: center; }
.header-section.end { justify-content: flex-end; }

.logo-chip { display: flex; align-items: center; gap: 8px; font-weight: 800; font-size: 0.9rem; letter-spacing: -0.5px; }
.logo-symbol { color: var(--accent-primary); }

.status-pill {
    display: flex; align-items: center; gap: 5px;
    background: rgba(125,125,125,0.08); padding: 6px 12px;
    border-radius: 20px; font-size: 0.75rem; font-weight: 700; color: var(--text-secondary);
}
.separator { color: var(--text-secondary); opacity: 0.3; }
.diff-dot { width: 6px; height: 6px; border-radius: 50%; background: #10b981; }

.control-item {
    background: none; border: none; width: 32px; height: 32px;
    color: var(--text-secondary); cursor: pointer; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
}
.control-item:hover { background: rgba(125,125,125,0.1); color: var(--text-primary); }
.divider-vertical { width: 1px; height: 16px; background: currentColor; opacity: 0.1; }
.settings-trigger { flex-direction: column; gap: 3px; }
.hamburger-line { width: 14px; height: 2px; background: currentColor; border-radius: 2px; }

/* GAME STAGE */
.game-stage { flex: 1; display: flex; flex-direction: column; gap: 16px; justify-content: center; }

/* Stats Card */
.stats-container {
    background: var(--bg-panel); backdrop-filter: var(--backdrop);
    border-radius: var(--radius-lg); padding: 16px 20px;
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: var(--shadow-soft); border: 1px solid rgba(255,255,255,0.2);
}

.player-card { display: flex; align-items: center; gap: 12px; opacity: 0.5; transition: 0.3s; }
.player-card.active { opacity: 1; transform: scale(1.05); }
.right-aligned { flex-direction: row-reverse; text-align: right; }

.avatar {
    width: 44px; height: 44px; border-radius: 14px;
    display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 1.4rem;
}
.avatar-x { background: var(--color-x-soft); color: var(--color-x); }
.avatar-o { background: var(--color-o-soft); color: var(--color-o); }

.p-name { font-size: 0.75rem; font-weight: 600; display: block; color: var(--text-secondary); }
.p-score { font-size: 1.4rem; font-weight: 800; line-height: 1; }
.mid-stats { text-align: center; }
.vs-label { display: block; font-size: 0.7rem; color: var(--accent-primary); font-weight: 800; }
.round-badge { font-size: 0.75rem; color: var(--text-secondary); }

/* === GRID (FIXED) === */
.board-wrapper {
    /* Corrected class name matching HTML */
    width: 100%; aspect-ratio: 1;
    background: var(--bg-panel); backdrop-filter: var(--backdrop); -webkit-backdrop-filter: var(--backdrop);
    border-radius: var(--radius-lg); padding: 12px;
    box-shadow: var(--shadow-soft); border: 1px solid rgba(255,255,255,0.2);
    position: relative;
}

.game-grid {
    width: 100%; height: 100%;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 10px;
}
.game-grid.grid-10 { grid-template-columns: repeat(10, 1fr); gap: 4px; }

.cell {
    background: rgba(125,125,125,0.08); border: none; border-radius: 12px;
    font-size: 3.5rem; font-weight: 800; color: var(--text-primary);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; transition: transform 0.1s;
}
.game-grid.grid-10 .cell { font-size: 1.1rem; border-radius: 4px; }
.cell:active:not(:disabled) { transform: scale(0.95); }
.cell.x { color: var(--color-x); }
.cell.o { color: var(--color-o); }

/* Variants */
.cell.ghost-mark { animation: fadeOut 0.8s forwards 0.5s; }
@keyframes fadeOut { to { opacity: 0; } }
.cell.can-move { box-shadow: inset 0 0 0 3px var(--accent-primary); animation: pulse 1.5s infinite; }
.cell.selected-to-move { background: var(--text-primary); color: var(--bg-app); transform: scale(0.85); border-radius: 50%; }
.cell.highlight { background: var(--text-primary); color: var(--bg-app) !important; box-shadow: 0 10px 20px rgba(0,0,0,0.2); transform: scale(1.05); z-index: 2; }

/* Bottom Actions */
.action-bar { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.btn {
    height: 48px; border-radius: 14px; border: none; font-weight: 700; font-size: 0.9rem;
    cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 8px;
}
.btn-primary-outline { background: transparent; border: 2px solid rgba(125,125,125,0.15); color: var(--text-primary); }
.btn-secondary { background: rgba(125,125,125,0.1); color: var(--text-primary); }

/* Responsive Header Hide */
@media (max-width: 400px) {
    .header-section.center { display: none; }
}

/*
   MODERN TIC-TAC-TOE | STYLE.CSS PART 2
   The Revamped "Breathable" Menu
*/

/* Base Modal Structure */
.modal-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.6); backdrop-filter: blur(8px);
    z-index: 100; display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none; transition: opacity 0.3s;
}
.modal-overlay.visible { opacity: 1; pointer-events: auto; }

/* The "Clean" Modal Card */
.modal-card.menu-design {
    width: 95%; max-width: 500px;
    height: auto; max-height: 85vh; /* prevent cut-off */
    background: var(--bg-card);
    border-radius: 32px;
    display: flex; flex-direction: column;
    position: relative; overflow: hidden;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    animation: slideUp 0.4s var(--ease);
}

@keyframes slideUp {
    from { transform: translateY(40px) scale(0.95); }
    to { transform: translateY(0) scale(1); }
}

/* Modal Header */
.modal-close-x {
    position: absolute; top: 20px; right: 20px;
    background: rgba(125,125,125,0.1); border: none;
    width: 36px; height: 36px; border-radius: 50%;
    font-size: 1.5rem; line-height: 1; color: var(--text-secondary);
    cursor: pointer; z-index: 10;
}
.menu-header {
    padding: 32px 32px 20px 32px;
    background: var(--bg-card);
}
.menu-header h2 { font-size: 1.8rem; font-weight: 800; letter-spacing: -1px; color: var(--text-primary); margin-bottom: 4px; }
.subtitle { color: var(--text-secondary); font-size: 0.95rem; }

/* Scrollable Content Area */
.menu-scroll-area {
    flex: 1; overflow-y: auto;
    padding: 10px 32px 20px 32px;
    display: flex; flex-direction: column; gap: 32px; /* Lots of breathing room */
}

/* Menu Sections */
.menu-section label {
    display: block; margin-bottom: 12px;
    font-size: 0.8rem; font-weight: 700; color: var(--text-secondary); letter-spacing: 1px; text-transform: uppercase;
}

/* 1. Opponent Switcher (Pill) */
.mode-toggle-pill {
    background: rgba(125,125,125,0.08);
    border-radius: 100px; padding: 4px;
    display: flex;
}
.switch-btn {
    flex: 1; border: none; background: none;
    padding: 12px; border-radius: 100px;
    font-weight: 700; color: var(--text-secondary);
    cursor: pointer; transition: all 0.3s ease;
    display: flex; align-items: center; justify-content: center; gap: 6px;
}
.switch-btn.active { background: var(--bg-card); color: var(--text-primary); box-shadow: 0 2px 8px rgba(0,0,0,0.05); }
.emoji { font-size: 1.2rem; }

/* 2. Game Variants (Large Cards) */
.variants-grid {
    display: grid; grid-template-columns: 1fr 1fr; gap: 12px;
}
.variant-card {
    background: rgba(125,125,125,0.03);
    border: 2px solid transparent;
    border-radius: 16px; padding: 16px;
    text-align: left; cursor: pointer;
    transition: all 0.2s; position: relative;
}
.variant-card:hover { background: rgba(125,125,125,0.06); }
.variant-card.active {
    border-color: var(--accent-primary);
    background: var(--accent-primary-soft);
}
.v-icon { font-size: 1.5rem; margin-bottom: 12px; display: block; }
.v-info { display: block; }
.v-title { display: block; font-weight: 800; color: var(--text-primary); font-size: 1rem; margin-bottom: 4px; }
.v-desc { font-size: 0.75rem; color: var(--text-secondary); line-height: 1.3; display: block; }
.v-check {
    position: absolute; top: 10px; right: 10px;
    color: var(--accent-primary); font-weight: 800; opacity: 0;
}
.variant-card.active .v-check { opacity: 1; }

/* 3. Inputs & Diff */
.split-inputs { display: flex; gap: 16px; }
.input-group { flex: 1; }
input[type="text"] {
    width: 100%; background: rgba(125,125,125,0.05);
    border: 2px solid transparent; padding: 14px 16px;
    border-radius: 12px; font-size: 1rem; font-weight: 600;
    color: var(--text-primary); outline: none;
}
input[type="text"]:focus { border-color: var(--accent-primary); background: var(--bg-card); }

.diff-slider-container {
    display: flex; gap: 8px;
}
.diff-btn {
    flex: 1; padding: 10px; border: 1px solid rgba(125,125,125,0.1);
    border-radius: 12px; background: transparent;
    font-weight: 600; color: var(--text-secondary); cursor: pointer;
}
.diff-btn.active { background: var(--text-primary); color: var(--bg-app); border-color: var(--text-primary); }

/* Menu Footer */
.menu-footer {
    padding: 20px 32px 32px 32px;
    background: var(--bg-card);
    border-top: 1px solid rgba(125,125,125,0.1);
}
.btn-launch {
    width: 100%; padding: 18px;
    background: var(--text-primary); color: var(--bg-app);
    border: none; border-radius: 16px;
    font-size: 1.1rem; font-weight: 800; letter-spacing: 1px; text-transform: uppercase;
    cursor: pointer; transition: transform 0.2s;
}
.btn-launch:active { transform: scale(0.98); opacity: 0.9; }

/* --- Result Modal --- */
.result-card {
    background: var(--bg-card); padding: 40px;
    border-radius: 32px; max-width: 400px; width: 90%;
    transform: scale(0.9); transition: transform 0.3s;
}
.modal-overlay.visible .result-card { transform: scale(1); }
.text-center { text-align: center; }
.result-decoration { font-size: 4rem; margin-bottom: 16px; }
.gradient-text {
    background: linear-gradient(135deg, var(--accent-primary), #ec4899);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    font-size: 2.5rem; font-weight: 900; margin-bottom: 8px;
}
.subtext { color: var(--text-secondary); margin-bottom: 32px; font-size: 1.1rem; }
.vertical-stack { display: flex; flex-direction: column; gap: 12px; }
.full-width { width: 100%; }
.btn-primary { background: var(--text-primary); color: var(--bg-app); }

/* Utils */
.hidden { display: none; }

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(50px, 50px) rotate(10deg); }
}

@keyframes pulse {
    0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; }
}

/* NAVIGATION */
.ui-dock {
    display: flex; justify-content: space-between; align-items: center;
    padding: 16px;
    background: var(--bg-panel);
    backdrop-filter: var(--blur-level); -webkit-backdrop-filter: var(--blur-level);
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255,255,255,0.1);
}

.logo { font-weight: 800; font-size: 1.2rem; display: flex; align-items: center; gap: 8px; }
.logo-icon { color: var(--accent-secondary); }

.icon-btn {
    background: transparent; border: none; cursor: pointer;
    width: 40px; height: 40px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    transition: background 0.2s var(--ease-smooth);
    font-size: 1.2rem;
}
.icon-btn:hover { background: rgba(125,125,125,0.1); }

/* GAME MAIN AREA */
.game-stage {
    flex: 1; display: flex; flex-direction: column; justify-content: center; gap: 24px;
}

/* STATS CARD */
.stats-card {
    background: var(--bg-panel); backdrop-filter: var(--blur-level); -webkit-backdrop-filter: var(--blur-level);
    border-radius: var(--radius-md); padding: 20px;
    display: flex; justify-content: space-between; align-items: center;
    box-shadow: var(--shadow-md); border: 1px solid rgba(255,255,255,0.2);
}

.player { display: flex; align-items: center; gap: 12px; opacity: 0.5; transition: opacity 0.3s, transform 0.3s; }
.player.active { opacity: 1; transform: scale(1.05); }

.avatar {
    width: 48px; height: 48px; border-radius: 14px; display: flex; align-items: center; justify-content: center;
    font-weight: 800; font-size: 1.5rem;
}
.avatar-x { background: var(--color-x-soft); color: var(--color-x); }
.avatar-o { background: var(--color-o-soft); color: var(--color-o); }

.p-info { display: flex; flex-direction: column; }
.p-name { font-size: 0.85rem; font-weight: 600; color: var(--text-secondary); max-width: 80px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.p-score { font-size: 1.5rem; font-weight: 700; line-height: 1; }
.align-right { align-items: flex-end; text-align: right; }

.game-status { text-align: center; }
.turn-indicator { font-size: 0.9rem; font-weight: 700; color: var(--accent-primary); margin-bottom: 4px; }
.round-counter { font-size: 0.75rem; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }

/* GAME GRID */
.board-container {
    aspect-ratio: 1; width: 100%;
    background: var(--bg-panel); backdrop-filter: var(--blur-level); -webkit-backdrop-filter: var(--blur-level);
    border-radius: var(--radius-lg);
    padding: 16px; position: relative;
    box-shadow: var(--shadow-md); border: 1px solid rgba(255,255,255,0.2);
}

.game-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); grid-template-rows: repeat(3, 1fr);
    gap: 12px; height: 100%; width: 100%;
}

.cell {
    background: rgba(125,125,125,0.05);
    border-radius: var(--radius-sm); border: none; cursor: pointer;
    font-size: 3.5rem; font-weight: 800; display: flex; align-items: center; justify-content: center;
    transition: all 0.3s var(--ease-spring);
    color: var(--text-primary);
    position: relative;
}
.cell:hover:not(:disabled) { background: rgba(125,125,125,0.1); transform: scale(0.98); }
.cell:active:not(:disabled) { transform: scale(0.95); }

.cell.x { color: var(--color-x); text-shadow: 0 0 20px rgba(99, 102, 241, 0.3); }
.cell.o { color: var(--color-o); text-shadow: 0 0 20px rgba(244, 63, 94, 0.3); }

/* Move Preview */
.cell:not(:disabled):hover::after {
    content: attr(data-preview);
    opacity: 0.2; transform: scale(0.8);
}

/* Winning Animation Classes */
.cell.dim { opacity: 0.3; transform: scale(0.9); }
.cell.highlight { background: var(--text-primary); color: var(--bg-app) !important; box-shadow: 0 10px 20px rgba(0,0,0,0.2); transform: scale(1.05); z-index: 2; }
[data-theme="dark"] .cell.highlight { background: #fff; color: #000 !important; }


/* ACTION BAR */
.action-bar { display: grid; grid-template-columns: 1.5fr 1fr; gap: 12px; }

.btn {
    border: none; height: 56px; border-radius: var(--radius-md);
    font-size: 1rem; font-weight: 700; cursor: pointer;
    display: flex; align-items: center; justify-content: center; gap: 8px;
    transition: transform 0.2s var(--ease-smooth), box-shadow 0.2s ease;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: var(--text-primary); color: var(--bg-app); box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.btn-secondary { background: rgba(125,125,125,0.1); color: var(--text-primary); }

/* MODALS */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.4); backdrop-filter: blur(4px);
    display: flex; align-items: center; justify-content: center;
    opacity: 0; pointer-events: none; transition: opacity 0.3s ease; z-index: 100;
}
.modal-overlay.visible { opacity: 1; pointer-events: auto; }

.modal-card {
    background: var(--bg-app); width: 90%; max-width: 400px;
    border-radius: var(--radius-lg); padding: 32px;
    box-shadow: var(--shadow-md); transform: translateY(20px);
    transition: transform 0.4s var(--ease-spring); border: 1px solid rgba(125,125,125,0.1);
    display: flex; flex-direction: column; gap: 20px;
}
.modal-overlay.visible .modal-card { transform: translateY(0); }

h2 { font-weight: 800; font-size: 1.8rem; }
.setup-group { display: flex; flex-direction: column; gap: 10px; }
label { font-size: 0.8rem; font-weight: 600; color: var(--text-secondary); text-transform: uppercase; letter-spacing: 1px; }

/* Modern Switches and Inputs */
.toggle-switch-container, .difficulty-select {
    background: rgba(125,125,125,0.1); padding: 4px; border-radius: var(--radius-md); display: flex;
}
.switch-btn, .diff-btn {
    flex: 1; background: transparent; border: none; padding: 10px; border-radius: 14px;
    font-weight: 600; color: var(--text-secondary); cursor: pointer; transition: all 0.3s ease;
}
.switch-btn.active, .diff-btn.active { background: var(--bg-app); color: var(--text-primary); box-shadow: var(--shadow-sm); }

.input-row { display: flex; gap: 16px; }
.input-wrap { flex: 1; }
input[type="text"] {
    width: 100%; padding: 14px; border-radius: var(--radius-sm); border: 2px solid rgba(125,125,125,0.1);
    background: transparent; font-size: 1rem; font-weight: 600; color: var(--text-primary); outline: none;
}
input:focus { border-color: var(--accent-primary); }
input:disabled { opacity: 0.6; cursor: not-allowed; }

.hidden { display: none !important; }
.full-width { width: 100%; }

@keyframes float {
    0% { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(50px, 50px) rotate(10deg); }
}

/* Responsive adjustments */
@media (min-width: 768px) {
    .app-wrapper { padding: 40px; max-width: 600px; justify-content: center; gap: 40px; }
    .cell { font-size: 4rem; }
}
/* --- PRO HEADER OVERHAUL --- */
.pro-header {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    align-items: center;
    padding: 12px 20px;
    margin-bottom: 20px;
    background: var(--bg-panel);
    backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px);
    border-radius: 24px;
    border: 1px solid rgba(255, 255, 255, 0.08);
    box-shadow:
        0 4px 24px -1px rgba(0, 0, 0, 0.05),
        0 0 1px rgba(0, 0, 0, 0.1);
    position: relative;
    z-index: 50;
}

/* Left Section: Identity */
.header-section { display: flex; align-items: center; gap: 12px; }
.header-section.start { justify-content: flex-start; }
.header-section.center { justify-content: center; }
.header-section.end { justify-content: flex-end; }

.logo-chip {
    display: flex; align-items: center; gap: 8px;
    color: var(--text-primary); font-weight: 800; letter-spacing: -0.5px;
}
.logo-chip svg { width: 18px; height: 18px; color: var(--accent-primary); }
.logo-text .highlight { color: var(--accent-primary); opacity: 0.8; }

/* Pulse Status Dot */
.engine-status-dot { position: relative; width: 8px; height: 8px; display: flex; align-items: center; justify-content: center; margin-left: 4px; }
.dot-core { width: 6px; height: 6px; background: #10b981; border-radius: 50%; position: relative; z-index: 2; }
.dot-pulse {
    position: absolute; width: 100%; height: 100%; background: #10b981;
    border-radius: 50%; animation: ping 2s cubic-bezier(0, 0, 0.2, 1) infinite; opacity: 0.5;
}
@keyframes ping { 75%, 100% { transform: scale(2.5); opacity: 0; } }

/* Center Section: Meaningful Context Badges */
.status-pill {
    display: flex; align-items: center; gap: 6px;
    background: rgba(125,125,125,0.08);
    padding: 6px 12px; border-radius: 20px;
    font-size: 0.75rem; font-weight: 600;
    color: var(--text-secondary);
    border: 1px solid rgba(125,125,125,0.1);
    transition: all 0.3s ease;
}

.diff-dot { width: 6px; height: 6px; border-radius: 50%; background: #fbbf24; }
.status-pill[data-val="easy"] .diff-dot { background: #10b981; }
.status-pill[data-val="medium"] .diff-dot { background: #fbbf24; }
.status-pill[data-val="hard"] .diff-dot { background: #ef4444; box-shadow: 0 0 8px rgba(239, 68, 68, 0.4); }

.separator { color: rgba(125,125,125,0.2); font-weight: 300; }

/* Right Section: Controls */
.control-item {
    width: 36px; height: 36px; border-radius: 10px;
    border: none; background: transparent;
    color: var(--text-secondary); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: all 0.2s var(--ease-smooth);
}
.control-item:hover { background: rgba(125,125,125,0.1); color: var(--text-primary); }
.control-item svg { width: 18px; height: 18px; }

.divider-vertical { width: 1px; height: 20px; background: rgba(125,125,125,0.15); margin: 0 4px; }

.settings-trigger { gap: 4px; flex-direction: column; width: 36px; height: 36px; }
.hamburger-line { width: 16px; height: 2px; background: currentColor; border-radius: 2px; transition: 0.3s; }
.settings-trigger:hover .hamburger-line:first-child { transform: translateY(-2px); }
.settings-trigger:hover .hamburger-line:last-child { transform: translateY(2px); }

/* Responsive Header Hide Logic */
@media (max-width: 480px) {
    .header-section.center { display: none; } /* Hide badges on very small screens to save space */
    .pro-header { grid-template-columns: 1fr 1fr; }
}


/* --- SETUP MODE CARDS --- */
.grid-selector {
    display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 8px;
}
.mode-card {
    background: rgba(125,125,125,0.05); border: 1px solid rgba(125,125,125,0.1);
    border-radius: var(--radius-sm); padding: 12px;
    cursor: pointer; text-align: left; transition: all 0.2s ease;
}
.mode-card:hover { background: rgba(125,125,125,0.1); }
.mode-card.active {
    background: rgba(99, 102, 241, 0.1); border-color: var(--accent-primary);
    box-shadow: 0 0 12px rgba(99, 102, 241, 0.15);
}
.card-icon { font-weight: 700; font-size: 0.9rem; color: var(--text-primary); margin-bottom: 2px; }
.card-desc { font-size: 0.7rem; color: var(--text-secondary); line-height: 1.2; }

/* --- GRID VARIATIONS --- */
/* 3x3 (Default) */
.game-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; width: 100%; height: 100%; }

/* 10x10 (Rapid Mode) */
.game-grid.grid-10 {
    grid-template-columns: repeat(10, 1fr);
    grid-template-rows: repeat(10, 1fr);
    gap: 4px;
}
.game-grid.grid-10 .cell {
    font-size: 1.2rem; border-radius: 4px; /* Smaller text for big grid */
}

/* --- GHOST MODE (Guess) --- */
.cell.ghost-mark {
    animation: fadeOutMark 1s forwards;
    animation-delay: 0.5s; /* Visible for 0.5s then fades */
}

@keyframes fadeOutMark {
    to { color: transparent; text-shadow: none; }
}

/* Only show ghost marks when Game Over or hovering (optional) */
.game-grid.game-over .cell.ghost-mark {
    color: inherit !important;
    animation: none; /* Reveal on game over */
}

/* --- SWITCH MODE HIGHLIGHTS --- */
.cell.can-move {
    box-shadow: inset 0 0 0 2px var(--accent-primary);
    animation: pulseBorder 1.5s infinite;
    cursor: grab;
}
.cell.selected-to-move {
    background: var(--text-primary) !important;
    color: var(--bg-app) !important;
    transform: scale(0.9);
    border-radius: 50%;
}

@keyframes pulseBorder {
    0% { opacity: 1; } 50% { opacity: 0.4; } 100% { opacity: 1; }
}