/*
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Copyright (c) 2026 Ahngunism. All rights reserved.
-----------------------------------------------------------
File    : style.css
Project : 2305_MOON_CHN - Moon China 중국어 단어 암기 퀴즈
Version : ver 2.0
-----------------------------------------------------------
*/

@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Noto+Sans+SC:wght@400;700;900&family=Noto+Sans+KR:wght@400;500;700&display=swap');

/* ========== DESIGN TOKENS ========== */
:root {
    --bg-primary:    #0f0a08;
    --bg-secondary:  #1e0f0a;
    --bg-card:       rgba(30, 15, 10, 0.75);
    --bg-card-hover: rgba(50, 20, 15, 0.85);
    --glass-border:  rgba(232, 92, 58, 0.18);
    --glass-shadow:  0 8px 32px rgba(0, 0, 0, 0.45);

    --accent-primary:   #E8553A;
    --accent-secondary: #F5A623;
    --accent-glow:      rgba(232, 85, 58, 0.3);
    --accent-gradient:  linear-gradient(135deg, #E8553A 0%, #C0392B 100%);
    --accent-gradient-hover: linear-gradient(135deg, #C0392B 0%, #E8553A 100%);

    --text-primary:   #fff5f0;
    --text-secondary: #b0a09a;
    --text-muted:     #705850;

    --correct-bg:       rgba(52, 211, 153, 0.15);
    --correct-border:   #34d399;
    --incorrect-bg:     rgba(251, 113, 133, 0.15);
    --incorrect-border: #fb7185;
    --neutral-bg:       rgba(148, 130, 120, 0.1);
    --neutral-border:   rgba(148, 130, 120, 0.3);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 28px;

    --transition-fast:   0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ========== RESET & BASE ========== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 24px 16px;
    overflow-x: hidden;
    position: relative;
}

/* ========== ANIMATED BACKGROUND ========== */
body::before {
    content: '';
    position: fixed;
    top: -50%; left: -50%;
    width: 200%; height: 200%;
    background:
        radial-gradient(ellipse at 20% 50%, rgba(232,85,58,0.07) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(245,166,35,0.05) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 80%, rgba(192,57,43,0.04) 0%, transparent 50%);
    animation: bgShift 20s ease-in-out infinite alternate;
    z-index: -1;
}
@keyframes bgShift {
    0%   { transform: translate(0, 0) rotate(0deg); }
    100% { transform: translate(-5%, -5%) rotate(3deg); }
}

/* ========== STARS ========== */
.stars { position: fixed; top: 0; left: 0; width: 100%; height: 100%; pointer-events: none; z-index: -1; }
.star {
    position: absolute; width: 2px; height: 2px;
    background: white; border-radius: 50%;
    animation: twinkle var(--duration) ease-in-out infinite alternate; opacity: 0;
}
@keyframes twinkle {
    0%   { opacity: 0; transform: scale(0.5); }
    100% { opacity: var(--max-opacity); transform: scale(1); }
}

/* ========== HERO ========== */
.hero { text-align: center; margin-bottom: 8px; }
.hero-moon {
    font-size: 4rem; margin-bottom: 8px;
    animation: moonFloat 4s ease-in-out infinite;
    filter: drop-shadow(0 0 20px rgba(245,166,35,0.4));
}
@keyframes moonFloat {
    0%, 100% { transform: translateY(0); }
    50%       { transform: translateY(-8px); }
}
.hero h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.2rem; font-weight: 800;
    background: linear-gradient(135deg, #fff5f0, var(--accent-primary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    line-height: 1.2; margin-bottom: 8px;
}
.hero p { color: var(--text-secondary); font-size: 1rem; }

/* ========== TITLE BAR (내부 페이지) ========== */
.title-bar {
    display: flex; align-items: center; justify-content: space-between;
    width: 100%; max-width: 680px; padding: 4px 0 12px;
}
.title-bar__home {
    display: flex; align-items: center; gap: 6px;
    text-decoration: none; color: var(--text-secondary);
    font-size: 0.88rem; font-weight: 600; transition: color var(--transition-fast);
}
.title-bar__home:hover { color: var(--accent-primary); }
.title-bar__cat {
    font-size: 0.82rem; font-weight: 700; color: var(--accent-primary);
    background: rgba(232,85,58,0.12); border: 1px solid rgba(232,85,58,0.3);
    padding: 4px 14px; border-radius: 20px; white-space: nowrap;
}

/* ========== FEATURE GRID (홈) ========== */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px; width: 100%; max-width: 640px; margin-top: 16px;
}
.feature-card {
    background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border); border-radius: var(--radius-xl);
    padding: 24px 20px; transition: border-color var(--transition-smooth);
    display: flex; flex-direction: column;
}
.feature-card:hover { border-color: rgba(232,85,58,0.35); }
.feature-card.tbd { opacity: 0.45; pointer-events: none; }
.feature-icon { font-size: 2.2rem; margin-bottom: 10px; }
.feature-title {
    font-family: 'Outfit', sans-serif;
    font-size: 1.1rem; font-weight: 700; color: var(--text-primary); margin-bottom: 6px;
}
.feature-desc { font-size: 0.82rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 16px; flex: 1; }
.card-actions { display: flex; flex-direction: column; gap: 8px; }
.btn-link {
    display: block; padding: 9px 14px; border-radius: var(--radius-md);
    text-decoration: none;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.88rem; font-weight: 600; text-align: center;
    transition: all var(--transition-fast);
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border); color: var(--text-secondary);
}
.btn-link:hover { border-color: var(--accent-primary); color: var(--accent-primary); background: rgba(232,85,58,0.08); transform: translateY(-1px); }
.btn-link.primary { background: var(--accent-gradient); border-color: transparent; color: white; box-shadow: 0 4px 15px var(--accent-glow); }
.btn-link.primary:hover { transform: translateY(-2px); box-shadow: 0 6px 20px var(--accent-glow); color: white; }

/* ========== PAGE CONTAINER (내부 페이지) ========== */
.page-container { width: 100%; max-width: 680px; display: flex; flex-direction: column; align-items: stretch; }
.page-header { text-align: center; margin-bottom: 20px; }
.page-title { font-family: 'Outfit', sans-serif; font-size: 1.6rem; font-weight: 800; color: var(--text-primary); margin-bottom: 4px; }
.page-sub { font-size: 0.9rem; color: var(--text-secondary); }

/* ========== SUBNAV ========== */
.subnav { display: flex; gap: 8px; width: 100%; margin-bottom: 20px; }
.subnav-btn {
    flex: 1; padding: 10px 12px; border-radius: var(--radius-md);
    text-decoration: none;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.88rem; font-weight: 600; text-align: center;
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border); color: var(--text-secondary);
    cursor: pointer; transition: all var(--transition-fast);
}
.subnav-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.subnav-btn.active { background: var(--accent-gradient); border-color: transparent; color: white; pointer-events: none; }

/* ========== SETTINGS FORM ========== */
.settings-form {
    background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border); border-radius: var(--radius-xl);
    padding: 24px; box-shadow: var(--glass-shadow); margin-bottom: 16px;
}
.settings-form fieldset { border: none; padding: 0; margin-bottom: 20px; }
.settings-form fieldset:last-of-type { margin-bottom: 0; }
.settings-form legend {
    font-size: 0.82rem; font-weight: 600; color: var(--text-secondary);
    text-transform: uppercase; letter-spacing: 0.08em; margin-bottom: 10px;
}
.scroll-group { display: flex; gap: 6px; flex-wrap: wrap; }
.scroll-group input[type="radio"] { display: none; }
.scroll-group label {
    padding: 8px 14px; border-radius: var(--radius-sm);
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border);
    color: var(--text-secondary);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.88rem; font-weight: 500; cursor: pointer;
    transition: all var(--transition-fast); white-space: nowrap;
}
.scroll-group label:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.scroll-group input[type="radio"]:checked + label {
    background: var(--accent-gradient); border-color: transparent;
    color: white; font-weight: 600; box-shadow: 0 3px 10px var(--accent-glow);
}
.scroll-group label.tbd { opacity: 0.4; cursor: not-allowed; }
.start-button {
    width: 100%; padding: 14px;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 1.05rem; font-weight: 700; color: white;
    background: var(--accent-gradient); border: none;
    border-radius: var(--radius-lg); cursor: pointer;
    transition: all var(--transition-fast);
    box-shadow: 0 4px 20px var(--accent-glow); margin-top: 20px;
}
.start-button:hover { transform: translateY(-2px); box-shadow: 0 8px 28px var(--accent-glow); }

/* ========== LAYOUT CONTROLS (단어장) ========== */
.layout-controls { display: flex; gap: 8px; margin-bottom: 12px; }
.layout-btn {
    padding: 8px 14px; border-radius: var(--radius-sm);
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border);
    color: var(--text-secondary);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.85rem; font-weight: 600; cursor: pointer; transition: all var(--transition-fast);
}
.layout-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.layout-btn.active { background: var(--accent-gradient); border-color: transparent; color: white; }

/* ========== WORDBOOK ========== */
.wordbook-list { display: grid; gap: 6px; width: 100%; }
.wordbook-list.cols-1 { grid-template-columns: 1fr; }
.wordbook-list.cols-3 { grid-template-columns: repeat(3, 1fr); }
.wordbook-list.cols-5 { grid-template-columns: repeat(5, 1fr); }

.wb-row {
    display: flex; align-items: center; gap: 8px;
    padding: 10px 14px; border-radius: var(--radius-sm);
    background: var(--bg-card); border: 1.5px solid var(--glass-border);
    cursor: pointer; transition: all var(--transition-fast); min-height: 52px;
}
.wb-row:hover { border-color: var(--accent-primary); background: var(--bg-card-hover); }
.cols-3 .wb-row, .cols-5 .wb-row {
    flex-direction: column; align-items: center; text-align: center; gap: 2px; padding: 10px 6px;
}

.wb-idx { font-size: 0.75rem; color: var(--text-muted); min-width: 24px; }
.cols-3 .wb-idx, .cols-5 .wb-idx { font-size: 0.7rem; min-width: auto; }

.wb-zh {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 1.3rem; font-weight: 700; color: var(--text-primary); flex: 1;
}
.cols-3 .wb-zh, .cols-5 .wb-zh { font-size: 1.1rem; flex: none; }

.wb-pinyin {
    font-size: 0.75rem; color: var(--accent-secondary); font-style: italic;
    font-family: 'Outfit', sans-serif;
}
.cols-3 .wb-pinyin, .cols-5 .wb-pinyin { font-size: 0.68rem; }

.wb-kr { font-family: 'Noto Sans KR', sans-serif; font-size: 0.9rem; color: var(--accent-primary); font-weight: 500; }
.cols-3 .wb-kr, .cols-5 .wb-kr { font-size: 0.8rem; }
.wb-hidden { visibility: hidden; height: 0; overflow: hidden; padding: 0; margin: 0; }
.cols-3 .wb-hidden, .cols-5 .wb-hidden { display: none; }

/* ========== FLASHCARD ========== */
.fc-wrapper { perspective: 1000px; width: 100%; max-width: 480px; margin: 0 auto 16px; }
.fc-card {
    position: relative; width: 100%; padding-top: 60%;
    transform-style: preserve-3d; transition: transform 0.45s ease; cursor: pointer;
}
.fc-card.flipped { transform: rotateY(180deg); }
.fc-front, .fc-back {
    position: absolute; inset: 0;
    display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 8px;
    border-radius: var(--radius-xl);
    background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1.5px solid var(--glass-border); box-shadow: var(--glass-shadow);
    backface-visibility: hidden; -webkit-backface-visibility: hidden;
    padding: 20px; text-align: center;
}
.fc-back { transform: rotateY(180deg); border-color: rgba(232,85,58,0.3); }
.fc-counter { position: absolute; top: 14px; right: 18px; font-size: 0.78rem; font-weight: 600; color: var(--text-muted); }
.fc-word {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 3rem; font-weight: 900; color: var(--text-primary);
    text-shadow: 0 0 40px var(--accent-glow); line-height: 1;
}
.fc-pinyin { font-family: 'Outfit', sans-serif; font-size: 1rem; color: var(--accent-secondary); font-style: italic; }
.fc-meaning { font-family: 'Noto Sans KR', sans-serif; font-size: 1.6rem; font-weight: 700; color: var(--accent-primary); line-height: 1.3; }
.fc-meaning-pinyin { font-family: 'Outfit', sans-serif; font-size: 0.9rem; color: var(--accent-secondary); font-style: italic; margin-top: 4px; }
.fc-tap-hint { font-size: 0.78rem; color: var(--text-muted); margin-top: 4px; }

.fc-progress-wrap { width: 100%; max-width: 480px; margin: 0 auto 12px; }
.fc-progress-bar { width: 100%; height: 5px; background: rgba(148,130,120,0.15); border-radius: 3px; overflow: hidden; }
.fc-progress-inner { height: 100%; background: var(--accent-gradient); border-radius: 3px; transition: width 0.35s ease; }

.fc-nav { display: flex; gap: 8px; width: 100%; max-width: 480px; margin: 0 auto 16px; }
.fc-nav-btn {
    flex: 1; padding: 10px 12px; border-radius: var(--radius-md);
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border);
    color: var(--text-secondary);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.88rem; font-weight: 600; cursor: pointer; transition: all var(--transition-fast);
}
.fc-nav-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); transform: translateY(-1px); }

.fc-control-bar {
    display: flex; align-items: stretch; justify-content: space-between;
    gap: 8px; width: 100%; max-width: 480px; margin: 0 auto;
    padding: 6px 10px;
    background: rgba(255,255,255,0.03);
    border-radius: var(--radius-sm); border: 1px solid var(--glass-border);
}
.fc-play-btn {
    flex: 1; display: flex; align-items: center; justify-content: center; gap: 8px;
    padding: 8px; background: transparent; border: none; cursor: pointer;
    color: var(--text-primary); transition: all var(--transition-fast); border-radius: var(--radius-sm);
}
.fc-play-btn:hover { background: rgba(232,85,58,0.12); }
.fc-divider { width: 1px; background: var(--glass-border); margin: 4px 0; }
.fc-speed-group { display: flex; gap: 4px; align-items: center; }
.speed-btn {
    padding: 5px 10px; border-radius: var(--radius-sm);
    background: transparent; border: 1.5px solid var(--neutral-border); color: var(--text-muted);
    font-family: 'Outfit', sans-serif; font-size: 0.78rem; font-weight: 600;
    cursor: pointer; transition: all var(--transition-fast);
}
.speed-btn:hover { border-color: var(--accent-primary); color: var(--accent-primary); }
.speed-btn.active { background: var(--accent-gradient); border-color: transparent; color: white; }

/* ========== QUIZ ========== */
.quiz-container {
    width: 100%; max-width: 640px;
    background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border); border-radius: var(--radius-xl);
    padding: 32px; box-shadow: var(--glass-shadow);
    text-align: center; transition: border-color var(--transition-smooth);
}
.progress-bar { width: 100%; height: 6px; background: rgba(148,130,120,0.15); border-radius: 3px; overflow: hidden; margin-bottom: 8px; }
.progress-bar-inner { height: 100%; width: 0%; background: var(--accent-gradient); border-radius: 3px; transition: width 0.4s ease; }
.progress-text { font-size: 0.85rem; font-weight: 500; color: var(--text-muted); margin-bottom: 24px; }

.question-display {
    font-family: 'Noto Sans SC', sans-serif;
    font-size: 7rem; font-weight: 900; color: var(--text-primary);
    height: 180px;
    display: flex; flex-direction: column; justify-content: center; align-items: center; gap: 6px;
    text-shadow: 0 0 60px var(--accent-glow);
    opacity: 1; transition: opacity 0.3s ease-in-out; cursor: pointer; line-height: 1;
}
.question-display.fade-out { opacity: 0; }
.question-display.show-answer { font-family: 'Noto Sans KR', sans-serif; font-size: 3.5rem; color: var(--accent-primary); }

.question-pinyin {
    font-family: 'Outfit', sans-serif; font-size: 1.3rem; font-weight: 500;
    color: var(--accent-secondary); opacity: 0; transition: opacity 0.3s; font-style: italic;
}
.question-pinyin.visible { opacity: 1; }

.answer-input {
    width: 100%; max-width: 340px; padding: 14px 20px;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 1.2rem; font-weight: 500; text-align: center;
    background: rgba(20, 10, 8, 0.6); border: 2px solid var(--neutral-border);
    border-radius: var(--radius-md); color: var(--text-primary);
    outline: none; transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
    margin-top: 16px;
}
.answer-input:focus { border-color: var(--accent-primary); box-shadow: 0 0 0 3px var(--accent-glow); }
.answer-input::placeholder { color: var(--text-muted); }
.answer-input:disabled { opacity: 0.5; }

.button-container { display: flex; gap: 12px; margin-top: 24px; }
.quiz-nav-button {
    flex: 1; padding: 12px 20px; border-radius: var(--radius-md);
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 0.95rem; font-weight: 600; cursor: pointer; transition: all var(--transition-fast);
    border: 1.5px solid transparent; text-align: center; text-decoration: none;
    background: var(--accent-gradient); color: white; box-shadow: 0 4px 15px var(--accent-glow);
}
.quiz-nav-button:hover { transform: translateY(-1px); box-shadow: 0 6px 20px var(--accent-glow); }
.quiz-nav-button.secondary { background: transparent; border-color: var(--neutral-border); color: var(--text-secondary); box-shadow: none; }
.quiz-nav-button.secondary:hover { border-color: var(--accent-primary); color: var(--accent-primary); background: rgba(232,85,58,0.05); }

.feedback-correct   { animation: flash-correct   0.5s; }
.feedback-incorrect { animation: flash-incorrect 0.5s; }
@keyframes flash-correct   { 50% { background-color: var(--correct-bg);   border-color: var(--correct-border); } }
@keyframes flash-incorrect { 50% { background-color: var(--incorrect-bg); border-color: var(--incorrect-border); } }

/* ========== RESULT ========== */
.result-container {
    width: 100%; max-width: 800px;
    background: var(--bg-card); backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border); border-radius: var(--radius-xl);
    padding: 32px; box-shadow: var(--glass-shadow); text-align: center;
}
.result-container h1 { font-family: 'Outfit', sans-serif; font-size: 1.5rem; font-weight: 700; margin-bottom: 4px; -webkit-text-fill-color: var(--text-primary); }
.score {
    font-family: 'Outfit', sans-serif; font-size: 3rem; font-weight: 800;
    background: linear-gradient(135deg, #34d399, var(--accent-primary));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
    margin: 16px 0;
}
.legend { display: flex; justify-content: center; gap: 20px; margin-bottom: 28px; flex-wrap: wrap; }
.legend-item { display: flex; align-items: center; gap: 6px; font-size: 0.85rem; color: var(--text-secondary); }
.legend-color { width: 12px; height: 12px; border-radius: 3px; }

.chart-container { margin-top: 20px; }
.chart-container h3 {
    font-size: 0.85rem; font-weight: 600; color: var(--accent-primary);
    text-transform: uppercase; letter-spacing: 0.08em; text-align: center;
    padding-bottom: 8px; margin-bottom: 12px; border-bottom: 1px solid var(--glass-border);
}

/* 결과 단어 그리드 */
.word-result-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(90px, 1fr));
    gap: 8px; margin-bottom: 24px;
}
.word-result-cell {
    display: flex; flex-direction: column;
    justify-content: center; align-items: center;
    min-height: 64px; padding: 8px 4px;
    border-radius: var(--radius-sm);
    font-family: 'Noto Sans SC', sans-serif;
    background: var(--neutral-bg); border: 1.5px solid var(--neutral-border);
    color: var(--text-primary); cursor: pointer;
    transition: all var(--transition-fast); user-select: none;
    text-align: center; gap: 2px;
}
.word-result-cell:hover { transform: translateY(-2px); box-shadow: 0 4px 12px var(--accent-glow); }
.word-result-cell .cell-zh  { font-size: 1.4rem; font-weight: 900; line-height: 1; }
.word-result-cell .cell-pinyin { font-size: 0.65rem; color: var(--accent-secondary); font-style: italic; opacity: 0.8; }
.word-result-cell .cell-kr {
    font-family: 'Noto Sans KR', sans-serif; font-size: 0.7rem; color: var(--text-secondary);
    opacity: 0; transition: opacity 0.2s; max-height: 0; overflow: hidden;
}
.word-result-cell.show-kr .cell-kr { opacity: 1; max-height: 40px; }
.word-result-cell.fade-out { opacity: 0; transition: opacity 0.3s ease-in-out; }
.word-result-cell.correct   { background: var(--correct-bg);   border-color: var(--correct-border); }
.word-result-cell.incorrect { background: var(--incorrect-bg); border-color: var(--incorrect-border); }
.word-result-cell.not-asked { background: var(--neutral-bg);   border-color: var(--neutral-border); opacity: 0.5; }

.result-actions { display: flex; gap: 12px; margin-top: 32px; }
.retry-button {
    display: inline-block; flex: 1; padding: 16px;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
    font-size: 1.05rem; font-weight: 700; color: white;
    background: var(--accent-gradient); border: none;
    border-radius: var(--radius-lg); text-decoration: none;
    cursor: pointer; transition: all var(--transition-fast);
    box-shadow: 0 4px 20px var(--accent-glow); position: relative; overflow: hidden;
}
.retry-button:hover { transform: translateY(-2px); box-shadow: 0 8px 30px rgba(232,85,58,0.4); }
.retry-button.secondary {
    background: transparent; border: 1.5px solid var(--neutral-border);
    color: var(--text-secondary); box-shadow: none;
}
.retry-button.secondary:hover { border-color: var(--accent-primary); color: var(--accent-primary); background: rgba(232,85,58,0.05); box-shadow: none; }

/* ========== AD CONTAINERS ========== */
.ad-grid { display: grid; grid-template-columns: repeat(2, 320px); gap: 12px; justify-content: center; margin-top: 20px; }
.ad-mobile-container-320-100-center { display: block; width: 320px; height: 100px; }
.ag-ad-area { width: 320px; }

/* ========== RESPONSIVE ========== */
@media (max-width: 680px) {
    .ad-grid { grid-template-columns: 320px; }
}
@media (max-width: 480px) {
    .hero h1 { font-size: 1.7rem; }
    .hero-moon { font-size: 3rem; }
    .quiz-container { padding: 24px 20px; }
    .result-container { padding: 24px 20px; }
    .question-display { font-size: 5rem; height: 150px; }
    .question-display.show-answer { font-size: 2.8rem; }
    .score { font-size: 2.2rem; }
    .feature-grid { grid-template-columns: 1fr; }
    .fc-word { font-size: 2.2rem; }
    .fc-meaning { font-size: 1.3rem; }
    .wordbook-list.cols-5 { grid-template-columns: repeat(3, 1fr); }
}