/* Theme variables — Indigo (default) */
:root,
[data-theme="indigo"] {
    --indigo-darkest: #1a1a2e;
    --indigo-dark: #16213e;
    --indigo-mid: #0f3460;
    --coral: #e94560;
    --coral-light: #ff6b81;
    --coral-bg: rgba(233, 69, 96, 0.3);
    --gold: #f5c518;
    --text-primary: #e0e0e0;
    --text-muted: #a0aec0;
    --nav-hover-bg: rgba(15, 52, 96, 0.5);
    --heading-color: #ffffff;
    --tip-bg: rgba(15, 52, 96, 0.4);
}

/* Theme variables — Dark */
[data-theme="dark"] {
    --indigo-darkest: #121212;
    --indigo-dark: #1e1e1e;
    --indigo-mid: #333333;
    --coral: #e94560;
    --coral-light: #ff6b81;
    --coral-bg: rgba(233, 69, 96, 0.3);
    --gold: #f5c518;
    --text-primary: #e0e0e0;
    --text-muted: #9e9e9e;
    --nav-hover-bg: rgba(255, 255, 255, 0.08);
    --heading-color: #ffffff;
    --tip-bg: rgba(51, 51, 51, 0.6);
}

/* Theme variables — Light */
[data-theme="light"] {
    --indigo-darkest: #f5f5f5;
    --indigo-dark: #ffffff;
    --indigo-mid: #dee2e6;
    --coral: #d63851;
    --coral-light: #e94560;
    --coral-bg: rgba(214, 56, 81, 0.2);
    --gold: #d4a017;
    --text-primary: #212529;
    --text-muted: #6c757d;
    --nav-hover-bg: rgba(0, 0, 0, 0.05);
    --heading-color: #212529;
    --tip-bg: rgba(0, 0, 0, 0.03);
}

/* Theme variables — Ocean */
[data-theme="ocean"] {
    --indigo-darkest: #e8f4f8;
    --indigo-dark: #ffffff;
    --indigo-mid: #b8d8e7;
    --coral: #0077b6;
    --coral-light: #0096c7;
    --coral-bg: rgba(0, 119, 182, 0.15);
    --gold: #e07a2f;
    --text-primary: #1b3a4b;
    --text-muted: #4a7c8f;
    --nav-hover-bg: rgba(0, 119, 182, 0.08);
    --heading-color: #023e58;
    --tip-bg: rgba(0, 119, 182, 0.06);
}

/* Theme variables — Forest */
[data-theme="forest"] {
    --indigo-darkest: #1a2e1a;
    --indigo-dark: #1e3a1e;
    --indigo-mid: #2d5a2d;
    --coral: #e6a838;
    --coral-light: #f0c060;
    --coral-bg: rgba(230, 168, 56, 0.25);
    --gold: #e6a838;
    --text-primary: #d4e5d4;
    --text-muted: #8aab8a;
    --nav-hover-bg: rgba(45, 90, 45, 0.5);
    --heading-color: #f0f5f0;
    --tip-bg: rgba(45, 90, 45, 0.4);
}

body {
    background-color: var(--indigo-darkest);
    color: var(--text-primary);
}

/* Navbar */
.navbar {
    background-color: var(--indigo-dark);
    border-bottom: 1px solid var(--indigo-mid);
}

.navbar-brand {
    color: var(--coral);
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 0.4rem;
}

.navbar-brand:hover {
    color: var(--coral-light);
}

.navbar-nav .nav-link {
    color: var(--text-muted);
    border-radius: 6px;
    padding: 0.4rem 1rem;
    margin: 0 0.15rem;
    font-weight: 500;
    transition: background-color 0.2s, color 0.2s;
}

.navbar-nav .nav-link:hover {
    color: var(--heading-color);
    background-color: var(--nav-hover-bg);
}

.navbar-nav .nav-link.active {
    color: var(--heading-color);
    background-color: var(--indigo-mid);
}

/* Hero */
.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.hero-emoji {
    font-size: 3rem;
    margin-bottom: 0.75rem;
}

.hero h1 {
    color: var(--heading-color);
    font-weight: 800;
}

.hero .lead {
    color: var(--text-muted);
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Buttons */
.btn-accent {
    background-color: var(--coral);
    border-color: var(--coral);
    color: #ffffff;
    font-weight: 600;
}

.btn-accent:hover {
    background-color: var(--coral-light);
    border-color: var(--coral-light);
    color: #ffffff;
}

/* Cards */
.card {
    background-color: var(--indigo-dark);
    border-color: var(--indigo-mid);
}

/* Content pages */
.content-section {
    background-color: var(--indigo-dark);
    border: 1px solid var(--indigo-mid);
    border-radius: 8px;
    padding: 2rem;
    margin-bottom: 1.5rem;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2rem;
    height: 2rem;
    background-color: var(--indigo-mid);
    color: var(--gold);
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.step-item {
    display: flex;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1.25rem;
}

.step-item p {
    margin: 0;
}

.tip-card {
    background-color: var(--tip-bg);
    border-left: 3px solid var(--gold);
    border-radius: 4px;
    padding: 1rem 1.25rem;
    margin-bottom: 0.75rem;
}

/* Footer */
.site-footer {
    border-top: 1px solid var(--indigo-mid);
    padding: 1.25rem 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-top: 3rem;
}

/* Game grid */
.game-grid {
    border-collapse: collapse;
}

.game-grid td {
    width: 2.5rem;
    height: 2.5rem;
    text-align: center;
    vertical-align: middle;
    font-size: 1.1rem;
    font-weight: 600;
    font-family: monospace;
    border: 1px solid var(--indigo-mid);
    cursor: pointer;
    user-select: none;
    transition: background-color 0.15s;
}

.game-grid td:hover {
    background-color: var(--indigo-mid);
}

.game-grid td.cell-selected {
    background-color: var(--coral-bg);
    outline: 2px solid var(--coral);
    outline-offset: -2px;
}

.game-grid td.cell-found {
    background-color: var(--coral);
    color: #ffffff;
}

/* Word list */
.list-group-item {
    background-color: var(--indigo-dark);
    border-color: var(--indigo-mid);
    color: var(--text-primary);
}

.list-group-item.word-found {
    text-decoration: line-through;
    color: var(--coral);
}

.card-header {
    background-color: var(--indigo-mid);
    border-color: var(--indigo-mid);
    color: var(--heading-color);
    font-weight: 600;
}

/* Form controls */
.form-select,
.form-control {
    background-color: var(--indigo-dark);
    border-color: var(--indigo-mid);
    color: var(--text-primary);
}

.form-select:focus,
.form-control:focus {
    background-color: var(--indigo-dark);
    border-color: var(--coral);
    color: var(--text-primary);
    box-shadow: 0 0 0 0.2rem var(--coral-bg);
}

.form-range::-webkit-slider-thumb {
    background: var(--coral);
}

.form-range::-moz-range-thumb {
    background: var(--coral);
}

/* Theme toggle */
#theme-toggle {
    border-color: var(--indigo-mid);
    color: var(--text-muted);
}

#theme-toggle:hover {
    color: var(--coral);
    border-color: var(--coral);
}