:root {
    --primary: #4CAF50;
    --primary-dark: #388E3C;
    --danger: #E53935;
    --danger-dark: #B71C1C;
    --bg: #F1F5F1;
    --card-bg: #ffffff;
    --text: #1a1a1a;
    --text-muted: #6b7280;
    --border: #e5e7eb;
    --select-bg: #fafafa;
    --select-arrow: %236b7280;
    --chip-active-bg: #e5e7eb;
    --chip-hidden-bg: #e0e0e0;
    --chip-hidden-border: #d0d0d0;
    --word-active-bg: #f9f9f9;
    --word-blur: rgba(0, 0, 0, 0.25);
    --danger-bg: #fee2e2;
    --danger-bg-hover: #fecaca;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
    --radius: 12px;
    --radius-sm: 8px;
    --spacing: 16px;
}

[data-theme="dark"] {
    --bg: #121212;
    --card-bg: #1e1e1e;
    --text: #e4e4e4;
    --text-muted: #9ca3af;
    --border: #333;
    --select-bg: #2a2a2a;
    --select-arrow: %239ca3af;
    --chip-active-bg: #333;
    --chip-hidden-bg: #2a2a2a;
    --chip-hidden-border: #444;
    --word-active-bg: #252525;
    --word-blur: rgba(255, 255, 255, 0.2);
    --danger-bg: #3a1c1c;
    --danger-bg-hover: #4a2020;
    --shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

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

html, body {
    height: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
}

/* ── Layout ─────────────────────────────────────────────────── */

.container {
    max-width: 560px;
    margin: 0 auto;
    padding: var(--spacing);
    padding-bottom: 40px;
}

header {
    text-align: left;
    padding: 24px 0 16px;
    position: relative;
}

h1 {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.5px;
    color: var(--primary-dark);
}

/* ── Settings Panel ──────────────────────────────────────────── */

.header-buttons {
    position: absolute;
    right: 0;
    top: 24px;
    display: flex;
    gap: 6px;
}

.header-btn {
    background: none;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    width: 36px;
    height: 36px;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color 0.15s, color 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.header-btn:hover {
    border-color: var(--primary);
    color: var(--text);
}

/* ── Help Modal ──────────────────────────────────────────────── */

.help-modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 200;
    align-items: center;
    justify-content: center;
}

.help-modal.open {
    display: flex;
}

.help-content {
    background: var(--card-bg);
    color: var(--text);
    border-radius: var(--radius);
    padding: 24px;
    max-width: 480px;
    width: calc(100% - 32px);
    position: relative;
    box-shadow: var(--shadow);
}

.help-content h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: var(--primary-dark);
}

.help-content p {
    font-size: 0.9rem;
    line-height: 1.6;
    color: var(--text);
    white-space: pre-line;
}

.help-close {
    position: absolute;
    right: 12px;
    top: 10px;
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
}

.settings-panel {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.settings-panel.open {
    max-height: 300px;
}

.settings-card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 16px;
    margin-bottom: 12px;
    width: max-content;
    margin-left: auto;
}

.settings-grid {
    display: grid;
    grid-template-columns: max-content max-content;
    align-items: center;
    gap: 8px 12px;
}

.setting-group {
    display: contents;
}

.settings-grid label {
    text-align: right;
}


.card {
    background: var(--card-bg);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
}

label {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
}

/* ── Language Selector ───────────────────────────────────────── */

.lang-selector {
    display: flex;
    gap: 2px;
}

.lang-btn {
    font-size: 1.5rem;
    background: none;
    border: 1.5px solid transparent;
    border-radius: 6px;
    padding: 2px 3px;
    cursor: pointer;
    line-height: 1;
    transition: border-color 0.15s, background 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.lang-btn.active {
    border-color: var(--primary);
    background: rgba(76, 175, 80, 0.12);
}

.lang-btn:hover:not(.active) {
    border-color: var(--border);
}

/* ── Words Total ─────────────────────────────────────────────── */

.words-total-wrapper {
    position: fixed;
    bottom: 12px;
    right: 16px;
    font-size: 0.75rem;
    color: var(--text-muted);
    pointer-events: none;
}

/* ── Word Display ─────────────────────────────────────────────── */

.word-display {
    text-align: center;
    padding: 28px 20px;
    border: 2px dashed var(--border);
    border-radius: var(--radius);
    cursor: pointer;
    user-select: none;
    transition: border-color 0.2s, background 0.2s;
    margin-bottom: 20px;
    -webkit-tap-highlight-color: transparent;
}

.word-display:active {
    background: var(--word-active-bg);
}

.main-word {
    font-size: 2.4rem;
    font-weight: 800;
    letter-spacing: -1px;
    word-break: break-word;
    line-height: 1.2;
    transition: color 0.15s, text-shadow 0.15s, filter 0.15s;
}

.main-word.hidden {
    color: transparent;
    text-shadow: 0 0 18px var(--word-blur);
    filter: blur(6px);
}

.word-meta {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 10px;
    margin-top: 8px;
    font-size: 0.8rem;
    color: var(--text-muted);
}

.tags {
    background: var(--bg);
    padding: 2px 8px;
    border-radius: 999px;
    font-size: 0.75rem;
}

/* ── Hints ───────────────────────────────────────────────────── */

.hints-section {
    margin-bottom: 20px;
}

.hints-section h3 {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 10px;
}

.hints-grid {
    min-height: 36px;
}

.hint-block {
    display: inline-block;
    padding: 7px 14px;
    background: var(--bg);
    border: 1.5px solid var(--border);
    border-radius: 999px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    transition: background 0.15s, color 0.15s, filter 0.15s;
    -webkit-tap-highlight-color: transparent;
}

.hint-block:active {
    background: var(--chip-active-bg);
}

.hint-block.hidden {
    color: transparent;
    background: var(--chip-hidden-bg);
    border-color: var(--chip-hidden-border);
    filter: blur(4px);
}

/* ── Buttons ─────────────────────────────────────────────────── */

.actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
}

.actions.single-button {
    grid-template-columns: 1fr;
}

.btn {
    min-height: 48px;
    padding: 12px 16px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-weight: 700;
    cursor: pointer;
    transition: background 0.15s, transform 0.1s;
    -webkit-tap-highlight-color: transparent;
    letter-spacing: 0.2px;
}

.btn:active {
    transform: scale(0.97);
}

.btn-primary {
    background: var(--primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--primary-dark);
}

.btn-danger {
    background: var(--danger-bg);
    color: var(--danger);
}

.btn-danger:hover {
    background: var(--danger-bg-hover);
}

/* ── Toggle Buttons (difficulty, theme, repeats) ─────────────── */

.difficulty-toggle,
.theme-toggle,
.repeats-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
}

.difficulty-toggle .toggle-btn,
.theme-toggle .toggle-btn {
    flex: 1;
    min-width: 0;
}

.repeats-toggle .toggle-btn {
    flex: 1;
    min-width: 0;
}

.toggle-btn {
    background: none;
    border: 1.5px solid var(--border);
    border-radius: 6px;
    padding: 4px 10px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    transition: background 0.15s, border-color 0.15s, color 0.15s;
    -webkit-tap-highlight-color: transparent;
    display: flex;
    justify-content: center;
    align-items: center;
}

.toggle-btn:hover {
    border-color: var(--primary);
}

.toggle-btn.active {
    background: var(--primary);
    border-color: var(--primary);
    color: #fff;
}

.toggle-btn.disabled {
    opacity: 0.4;
    pointer-events: none;
}

/* ── Copyright ────────────────────────────────────────────────── */

.copyright {
    position: fixed;
    bottom: 12px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 0.65rem;
    color: var(--border);
    pointer-events: none;
}

/* ── Cookie Banner ───────────────────────────────────────────── */

.cookie-banner {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--card-bg);
    border-top: 1px solid var(--border);
    padding: 12px 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 0.8rem;
    color: var(--text-muted);
    z-index: 100;
    box-shadow: 0 -2px 8px rgba(0, 0, 0, 0.1);
}

.cookie-banner.dismissed {
    display: none;
}

.cookie-actions {
    display: flex;
    gap: 6px;
    flex-shrink: 0;
}

.cookie-btn {
    border: none;
    border-radius: 6px;
    padding: 6px 14px;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.cookie-btn-accept {
    background: var(--primary);
    color: #fff;
}

.cookie-btn-reject {
    background: var(--bg);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* ── Mobile ──────────────────────────────────────────────────── */

@media (max-width: 400px) {
    h1 { font-size: 1.5rem; }

    .main-word { font-size: 2rem; }

    .actions { grid-template-columns: 1fr; }

    .card { padding: 16px; }

    .word-display { padding: 22px 12px; }
}