/* ===== Mecha Words - 机甲单词 ===== */

:root {
    --mw-bg: linear-gradient(135deg, #0a0a1a 0%, #101030 50%, #0d0d20 100%);
    --mw-primary: #60a5fa;
    --mw-accent: #f59e0b;
    --mw-success: #34d399;
    --mw-danger: #f87171;
    --mw-card-bg: #1a1a3e;
    --mw-card-border: #2d2d5e;
    --mw-text: #e5e7eb;
    --mw-text-dim: #6b7280;
    --mw-glow-blue: 0 0 20px rgba(96, 165, 250, 0.4);
    --mw-glow-gold: 0 0 20px rgba(245, 158, 11, 0.4);
    --mw-radius: 14px;
}

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

.mw-app {
    min-height: 100dvh;
    background: var(--mw-bg);
    display: flex;
    flex-direction: column;
    color: var(--mw-text);
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    overflow-x: hidden;
}
@media (min-width: 768px) {
    body { background: #0a0a1a; }
    .mw-app { width: 100%; max-width: 660px; margin: 0 auto; }
}

/* ===== Header ===== */
.mw-header {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    position: relative;
    z-index: 100;
    background: rgba(10, 10, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(96, 165, 250, 0.15);
}

.mw-back {
    display: flex;
    align-items: center;
    gap: 4px;
    color: var(--mw-primary);
    text-decoration: none;
    font-size: 14px;
    padding: 6px 10px;
    border-radius: 8px;
    transition: background .15s;
}
.mw-back:hover { background: rgba(96, 165, 250, 0.1); }

.mw-header-title {
    flex: 1;
    text-align: center;
    font-size: 16px;
    font-weight: 700;
    background: linear-gradient(90deg, #60a5fa, #a78bfa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.mw-points-badge {
    display: flex;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #000;
    font-weight: 700;
    font-size: 13px;
    padding: 5px 12px;
    border-radius: 20px;
    box-shadow: var(--mw-glow-gold);
}
.mw-points-badge i { font-size: 12px; }

/* ===== Collection Bar ===== */
.mw-collection-bar {
    padding: 10px 16px;
    background: rgba(26, 26, 62, 0.6);
    border-bottom: 1px solid rgba(96, 165, 250, 0.1);
}
.mw-collection-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: 13px;
    color: var(--mw-text-dim);
    user-select: none;
}
.mw-collection-toggle i { transition: transform .3s; }
.mw-collection-toggle.open i { transform: rotate(180deg); }
.mw-collection-count {
    background: var(--mw-primary);
    color: #000;
    font-weight: 700;
    font-size: 11px;
    padding: 1px 7px;
    border-radius: 10px;
    margin-left: 4px;
}

.mw-collection-grid {
    display: none;
    grid-template-columns: repeat(auto-fill, minmax(60px, 1fr));
    gap: 8px;
    margin-top: 10px;
    max-height: 450px;
    overflow-y: auto;
    padding: 4px;
}
.mw-collection-grid.open { display: grid; }
.mw-collection-item {
    aspect-ratio: 4/3;
    border-radius: 8px;
    overflow: hidden;
    cursor: pointer;
    border: 2px solid var(--mw-card-border);
    transition: all .2s;
}
.mw-collection-item:hover { border-color: var(--mw-primary); transform: scale(1.05); }
.mw-collection-item img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Screens ===== */
.mw-screen {
    display: none;
    flex: 1;
    flex-direction: column;
}
.mw-screen.active { display: flex; }

/* ===== Draw Screen ===== */
.mw-draw-screen {
    align-items: center;
    justify-content: center;
    padding: 20px;
    gap: 24px;
}

.mw-draw-title {
    font-size: 22px;
    font-weight: 800;
    text-align: center;
    background: linear-gradient(90deg, #60a5fa, #a78bfa, #f59e0b);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
.mw-draw-subtitle {
    font-size: 13px;
    color: var(--mw-text-dim);
    text-align: center;
    margin-top: 4px;
}

.mw-draw-btn {
    position: relative;
    width: 180px;
    height: 180px;
    border-radius: 50%;
    border: 3px solid var(--mw-primary);
    background: radial-gradient(circle at 40% 40%, #1e3a5f, #0a0a2e);
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    color: var(--mw-text);
    font-size: 16px;
    font-weight: 700;
    transition: all .3s;
    box-shadow: var(--mw-glow-blue), inset 0 0 40px rgba(96, 165, 250, 0.1);
    animation: mw-pulse 2s ease-in-out infinite;
}
.mw-draw-btn:hover { transform: scale(1.05); box-shadow: 0 0 40px rgba(96, 165, 250, 0.6); }
.mw-draw-btn:active { transform: scale(0.95); }
.mw-draw-btn.disabled { opacity: 0.4; cursor: not-allowed; animation: none; }
.mw-draw-btn .cost { font-size: 12px; color: var(--mw-accent); font-weight: 400; }

@keyframes mw-pulse {
    0%, 100% { box-shadow: var(--mw-glow-blue), inset 0 0 40px rgba(96, 165, 250, 0.1); }
    50% { box-shadow: 0 0 40px rgba(96, 165, 250, 0.5), inset 0 0 60px rgba(96, 165, 250, 0.15); }
}

.mw-draw-actions {
    display: flex;
    gap: 12px;
}
.mw-action-btn {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 10px 20px;
    border-radius: 10px;
    border: 1px solid var(--mw-card-border);
    background: var(--mw-card-bg);
    color: var(--mw-text);
    font-size: 14px;
    cursor: pointer;
    transition: all .2s;
}
.mw-action-btn:hover { border-color: var(--mw-primary); background: rgba(96, 165, 250, 0.1); }
.mw-action-btn.primary {
    background: linear-gradient(135deg, var(--mw-primary), #818cf8);
    border-color: transparent;
    color: #fff;
    font-weight: 600;
}

.mw-no-points-hint {
    display: none;
    text-align: center;
    font-size: 13px;
    color: var(--mw-accent);
}
.mw-no-points-hint a { color: var(--mw-accent); text-decoration: underline; cursor: pointer; }

/* ===== Card Reveal ===== */
.mw-reveal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 500;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 20px;
}
.mw-reveal-overlay.active { display: flex; }

.mw-reveal-card {
    width: 85%;
    max-width: 500px;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 0 60px rgba(96, 165, 250, 0.4);
    transform: scale(0);
    animation: mw-card-appear .6s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.mw-reveal-card img { width: 100%; display: block; cursor: pointer; }

/* ===== Fullscreen Card Zoom ===== */
.mw-zoom-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: #000;
    z-index: 900;
    overflow: hidden;
    touch-action: none;
}
.mw-zoom-overlay.active { display: block; }
.mw-zoom-container {
    width: 100%;
    height: 100%;
    overflow: hidden;
    position: relative;
}
.mw-zoom-container img {
    display: block;
    position: absolute;
    top: 0; left: 0;
    transform-origin: 0 0;
    user-select: none;
    -webkit-user-drag: none;
}
.mw-zoom-close {
    position: fixed;
    top: 16px;
    right: 16px;
    z-index: 910;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: none;
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.mw-zoom-close:hover { background: rgba(255, 255, 255, 0.2); }
.mw-zoom-hint {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 910;
    font-size: 12px;
    color: rgba(255, 255, 255, 0.5);
    pointer-events: none;
    animation: mw-hint-fade 3s forwards;
}
@keyframes mw-hint-fade {
    0%, 60% { opacity: 1; }
    100% { opacity: 0; }
}

@keyframes mw-card-appear {
    0% { transform: scale(0) rotate(-10deg); opacity: 0; }
    100% { transform: scale(1) rotate(0deg); opacity: 1; }
}

.mw-reveal-info {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2px;
    opacity: 0;
    animation: mw-fade-up .5s .4s forwards;
}
.mw-reveal-word {
    font-size: 26px;
    font-weight: 800;
    color: #fff;
    text-shadow: 0 0 20px rgba(96, 165, 250, 0.6);
    letter-spacing: 1px;
}
.mw-reveal-meaning {
    font-size: 14px;
    color: var(--mw-text-dim);
}

.mw-reveal-actions {
    display: flex;
    gap: 12px;
    opacity: 0;
    animation: mw-fade-up .5s .5s forwards;
}

@keyframes mw-fade-up {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== Card Collect Animation ===== */
.mw-flying-card {
    position: fixed;
    z-index: 600;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.6);
    pointer-events: none;
    transition: all .7s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.mw-flying-card img { width: 100%; height: 100%; object-fit: cover; }

/* ===== Quiz Screen ===== */
.mw-quiz-screen {
    padding: 20px 16px;
    gap: 16px;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.mw-quiz-progress {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 13px;
    color: var(--mw-text-dim);
}
.mw-quiz-progress-bar {
    flex: 1;
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}
.mw-quiz-progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--mw-primary), #a78bfa);
    border-radius: 3px;
    transition: width .3s;
}

.mw-streak-badge {
    display: none;
    align-items: center;
    gap: 4px;
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
    font-weight: 700;
    font-size: 12px;
    padding: 4px 10px;
    border-radius: 12px;
    animation: mw-streak-pop .4s cubic-bezier(0.34, 1.56, 0.64, 1);
}
.mw-streak-badge.active { display: inline-flex; }
@keyframes mw-streak-pop {
    0% { transform: scale(0); }
    100% { transform: scale(1); }
}

.mw-quiz-card {
    background: var(--mw-card-bg);
    border: 1px solid var(--mw-card-border);
    border-radius: var(--mw-radius);
    padding: 24px;
    text-align: center;
}
.mw-quiz-type {
    font-size: 12px;
    color: var(--mw-text-dim);
    margin-bottom: 12px;
}
.mw-quiz-prompt {
    font-size: 28px;
    font-weight: 800;
    margin-bottom: 4px;
    word-break: break-all;
}
.mw-quiz-prompt-sub {
    font-size: 14px;
    color: var(--mw-text-dim);
}
/* Fill-in type */
.mw-fill-letters {
    display: flex;
    justify-content: center;
    gap: 6px;
    flex-wrap: wrap;
    margin: 16px 0 8px;
}
.mw-fill-letter {
    width: 40px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: 700;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid var(--mw-card-border);
    font-family: 'Courier New', monospace;
}
.mw-fill-letter.blank {
    border-color: var(--mw-primary);
    color: var(--mw-primary);
    border-style: dashed;
}

.mw-quiz-options {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin-top: 20px;
}
.mw-quiz-option {
    padding: 14px;
    border-radius: 10px;
    border: 2px solid var(--mw-card-border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--mw-text);
    font-size: 15px;
    cursor: pointer;
    transition: all .2s;
    text-align: center;
}
.mw-quiz-option:hover { border-color: var(--mw-primary); background: rgba(96, 165, 250, 0.08); }
.mw-quiz-option.correct {
    border-color: var(--mw-success);
    background: rgba(52, 211, 153, 0.15);
    color: var(--mw-success);
}
.mw-quiz-option.wrong {
    border-color: var(--mw-danger);
    background: rgba(248, 113, 113, 0.15);
    color: var(--mw-danger);
}
.mw-quiz-option.disabled { pointer-events: none; opacity: 0.5; }
.mw-quiz-option.disabled.correct { opacity: 1; }

/* ===== Points Fly Animation ===== */
.mw-points-fly {
    position: fixed;
    z-index: 700;
    font-size: 24px;
    font-weight: 800;
    color: var(--mw-accent);
    text-shadow: 0 0 10px rgba(245, 158, 11, 0.6);
    pointer-events: none;
    animation: mw-fly-up 1.2s ease-out forwards;
}
@keyframes mw-fly-up {
    0% { opacity: 1; transform: translateY(0) scale(1); }
    50% { opacity: 1; transform: translateY(-60px) scale(1.3); }
    100% { opacity: 0; transform: translateY(-120px) scale(0.8); }
}

/* ===== Quiz Result Card Show ===== */
.mw-quiz-result-card {
    display: none;
    margin-top: 12px;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    animation: mw-card-appear .5s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
}
.mw-quiz-result-card.active { display: block; }
.mw-quiz-result-card img { width: 100%; display: block; border-radius: 10px; }

.mw-quiz-next-btn {
    margin-top: 16px;
    padding: 14px;
    width: 100%;
    border-radius: 10px;
    border: none;
    background: linear-gradient(135deg, var(--mw-primary), #818cf8);
    color: #fff;
    font-size: 15px;
    font-weight: 600;
    cursor: pointer;
    display: none;
    transition: opacity .2s;
}
.mw-quiz-next-btn.active { display: block; }
.mw-quiz-next-btn:hover { opacity: 0.9; }

/* ===== Card Preview Modal ===== */
.mw-preview-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 800;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 0;
}
.mw-preview-overlay.active { display: flex; }
.mw-preview-card {
    width: 90%;
    max-width: 600px;
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 0 40px rgba(96, 165, 250, 0.3);
    position: relative;
}
.mw-preview-card img { width: 100%; display: block; }
.mw-video-play-btn {
    position: absolute;
    bottom: 12px;
    left: 12px;
    padding: 8px 14px;
    border-radius: 8px;
    border: none;
    background: rgba(0, 0, 0, 0.55);
    color: #fff;
    font-size: 24px;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(4px);
    transition: background .2s;
}
.mw-video-play-btn:hover { background: rgba(0, 0, 0, 0.75); }

.mw-star-wrap {
    display: flex;
    justify-content: center;
    margin-top: 20px;
}
.mw-star-btn {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(255, 255, 255, 0.08);
    color: rgba(255, 255, 255, 0.5);
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all .2s;
}
.mw-star-btn:hover { background: rgba(255, 255, 255, 0.15); }
.mw-star-btn.active { color: #f59e0b; border-color: #f59e0b; }

.mw-collection-item.starred { border-color: #f59e0b; box-shadow: 0 0 8px rgba(245, 158, 11, 0.3); }
.mw-preview-overlay .mw-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(0, 0, 0, 0.5);
    color: #fff;
    font-size: 20px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ===== Particles ===== */
.mw-particle {
    position: fixed;
    pointer-events: none;
    z-index: 650;
    font-size: 20px;
    animation: mw-particle-burst 1s ease-out forwards;
}
@keyframes mw-particle-burst {
    0% { opacity: 1; transform: translate(0, 0) scale(1); }
    100% { opacity: 0; transform: translate(var(--dx), var(--dy)) scale(0); }
}

/* ===== Exit Confirm Dialog ===== */
.mw-confirm-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0, 0, 0, 0.7);
    z-index: 950;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.mw-confirm-overlay.active { display: flex; }
.mw-confirm-box {
    background: linear-gradient(135deg, #1a1a3e, #0d0d20);
    border: 1px solid rgba(96, 165, 250, 0.2);
    border-radius: 16px;
    padding: 32px 28px;
    width: 85%;
    max-width: 320px;
    text-align: center;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5), 0 0 40px rgba(96, 165, 250, 0.1);
    animation: mw-card-appear .3s ease-out;
}
.mw-confirm-icon {
    font-size: 40px;
    color: var(--mw-accent);
    margin-bottom: 12px;
}
.mw-confirm-title {
    font-size: 20px;
    font-weight: 700;
    color: #fff;
    margin-bottom: 8px;
}
.mw-confirm-text {
    font-size: 13px;
    color: var(--mw-text-dim);
    margin-bottom: 24px;
    line-height: 1.5;
}
.mw-confirm-actions {
    display: flex;
    gap: 10px;
}
.mw-confirm-btn {
    flex: 1;
    padding: 12px;
    border-radius: 10px;
    border: none;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity .2s;
}
.mw-confirm-btn:hover { opacity: 0.85; }
.mw-confirm-btn.cancel {
    background: linear-gradient(135deg, var(--mw-primary), #818cf8);
    color: #fff;
}
.mw-confirm-btn.exit {
    background: rgba(255, 255, 255, 0.12);
    border: 1px solid rgba(255, 255, 255, 0.25);
    color: var(--mw-text);
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .mw-draw-btn { width: 150px; height: 150px; font-size: 14px; }
    .mw-quiz-prompt { font-size: 22px; }
    .mw-quiz-options { grid-template-columns: 1fr; }
    .mw-reveal-word { font-size: 22px; }
    .mw-fill-letter { width: 34px; height: 42px; font-size: 20px; }
}