/* Dunhuang Flying Silk (敦煌飞天：天衣神帛) Style Sheet */
:root {
    --color-sand-dark: #1a120c;
    --color-sand-mid: #2b1f17;
    --color-sand-light: #3d2c21;
    --color-gold-bright: #f4d35e;
    --color-gold-deep: #ee9b00;
    --color-cinnabar: #e63946;
    --color-malachite: #2a9d8f;
    --color-lapis: #1d3557;
    --color-silk-red: #d62828;
    --color-text-main: #f7f4ea;
    --color-text-sub: #d4a373;
    --font-heading: 'Ma Shan Zheng', 'Noto Serif SC', serif;
    --font-body: 'Outfit', 'Noto Sans SC', sans-serif;
    --radius-sm: 8px;
    --radius-md: 16px;
    --radius-lg: 24px;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
    user-select: none;
    -webkit-user-select: none;
    -webkit-tap-highlight-color: transparent;
}

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    background-color: var(--color-sand-dark);
    font-family: var(--font-body);
    color: var(--color-text-main);
    touch-action: none;
}

/* Sandstone Fresco Background */
.dunhuang-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 0;
    pointer-events: none;
    background: radial-gradient(circle at 50% 30%, #3e2a1e 0%, #231710 60%, #120b07 100%);
}

.sandstone-texture {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(rgba(244, 211, 94, 0.05) 1px, transparent 1px);
    background-size: 24px 24px;
    opacity: 0.6;
}

.flying-clouds {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 80%, rgba(230, 57, 70, 0.08) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 20%, rgba(42, 157, 143, 0.08) 0%, transparent 50%);
}

.gold-dust-overlay {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 50% 50%, rgba(238, 155, 0, 0.04) 0%, transparent 70%);
}

/* App Container */
.app-container {
    position: relative;
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    max-width: 900px;
    height: 100vh;
    margin: 0 auto;
    padding: 12px 16px;
}

/* Header Navigation */
.game-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
    padding: 8px 16px;
    background: rgba(43, 31, 23, 0.7);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid rgba(244, 211, 94, 0.2);
    border-radius: var(--radius-md);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
}

.back-link {
    display: flex;
    align-items: center;
    gap: 6px;
    color: var(--color-gold-bright);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    padding: 6px 12px;
    background: rgba(238, 155, 0, 0.12);
    border: 1px solid rgba(244, 211, 94, 0.3);
    border-radius: 20px;
    transition: all 0.2s ease;
}

.back-link:hover {
    background: rgba(238, 155, 0, 0.25);
    border-color: var(--color-gold-bright);
    transform: translateY(-1px);
}

.header-title {
    text-align: center;
}

.header-title h1 {
    font-family: var(--font-heading);
    font-size: 22px;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--color-gold-bright);
    text-shadow: 0 0 10px rgba(244, 211, 94, 0.4);
}

.header-title h1 span {
    font-family: var(--font-body);
    font-size: 12px;
    letter-spacing: 1px;
    opacity: 0.8;
    color: var(--color-text-sub);
}

.header-title .subtitle {
    font-size: 11px;
    color: var(--color-text-sub);
    letter-spacing: 3px;
}

.header-controls {
    display: flex;
    gap: 8px;
}

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: rgba(244, 211, 94, 0.1);
    border: 1px solid rgba(244, 211, 94, 0.25);
    border-radius: 50%;
    color: var(--color-gold-bright);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: rgba(244, 211, 94, 0.25);
    transform: scale(1.05);
}

/* HUD Panel */
.hud-panel {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    padding: 8px 16px;
    background: rgba(43, 31, 23, 0.5);
    border: 1px solid rgba(212, 163, 115, 0.2);
    border-radius: var(--radius-sm);
    margin: 6px 0;
}

.hud-box {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hud-label {
    font-size: 11px;
    color: var(--color-text-sub);
    letter-spacing: 1px;
}

.hud-val {
    font-size: 20px;
    font-weight: 800;
    font-family: var(--font-body);
    color: var(--color-text-main);
}

.glow-gold {
    color: var(--color-gold-bright);
    text-shadow: 0 0 8px rgba(244, 211, 94, 0.5);
}

.hud-skill-box {
    flex: 1;
    max-width: 300px;
}

.hud-label-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 3px;
}

.hud-sub {
    font-size: 10px;
    color: var(--color-gold-bright);
    font-weight: 700;
}

.meter-bar {
    width: 100%;
    height: 8px;
    background: rgba(0, 0, 0, 0.4);
    border: 1px solid rgba(244, 211, 94, 0.3);
    border-radius: 4px;
    overflow: hidden;
}

.meter-fill {
    width: 0%;
    height: 100%;
    background: linear-gradient(90deg, var(--color-malachite), var(--color-gold-bright), var(--color-cinnabar));
    transition: width 0.3s ease;
    box-shadow: 0 0 10px rgba(244, 211, 94, 0.6);
}

/* Viewport & Canvas */
.game-viewport {
    position: relative;
    width: 100%;
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    max-height: calc(100vh - 220px);
}

#game-canvas {
    width: 100%;
    height: 100%;
    max-width: 800px;
    max-height: 560px;
    object-fit: contain;
    background: rgba(25, 17, 12, 0.85);
    border: 2px solid rgba(244, 211, 94, 0.35);
    border-radius: var(--radius-md);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.6), inset 0 0 30px rgba(0, 0, 0, 0.5);
}

/* Overlay Modal */
.overlay-modal {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(18, 11, 7, 0.85);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--radius-md);
    z-index: 20;
    transition: opacity 0.3s ease;
}

.modal-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 440px;
    padding: 28px 24px;
    background: linear-gradient(145deg, #3d2b1f, #251912);
    border: 2px solid var(--color-gold-bright);
    border-radius: var(--radius-lg);
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.8), 0 0 20px rgba(244, 211, 94, 0.2);
}

.fresco-seal {
    font-family: var(--font-heading);
    font-size: 14px;
    color: var(--color-cinnabar);
    padding: 2px 10px;
    background: rgba(230, 57, 70, 0.15);
    border: 1px solid var(--color-cinnabar);
    border-radius: 4px;
    margin-bottom: 12px;
}

.modal-title {
    font-family: var(--font-heading);
    font-size: 28px;
    color: var(--color-gold-bright);
    margin-bottom: 12px;
    text-shadow: 0 2px 8px rgba(0, 0, 0, 0.8);
}

.modal-desc {
    font-size: 13px;
    line-height: 1.6;
    color: var(--color-text-main);
    margin-bottom: 20px;
    opacity: 0.9;
}

.modal-desc kbd {
    background: rgba(244, 211, 94, 0.2);
    border: 1px solid rgba(244, 211, 94, 0.4);
    border-radius: 4px;
    padding: 1px 6px;
    font-family: var(--font-body);
    color: var(--color-gold-bright);
}

.stats-result {
    display: flex;
    gap: 24px;
    margin-bottom: 20px;
    padding: 12px 20px;
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--radius-sm);
    border: 1px dashed rgba(244, 211, 94, 0.3);
}

.res-item {
    display: flex;
    flex-direction: column;
}

.res-lbl {
    font-size: 11px;
    color: var(--color-text-sub);
}

.res-val {
    font-size: 24px;
    font-weight: 800;
}

.glow-cinnabar {
    color: var(--color-cinnabar);
    text-shadow: 0 0 8px rgba(230, 57, 70, 0.5);
}

.start-btn {
    width: 100%;
    padding: 14px 28px;
    font-family: var(--font-heading);
    font-size: 20px;
    letter-spacing: 2px;
    color: var(--color-sand-dark);
    background: linear-gradient(135deg, #f4d35e, #ee9b00);
    border: none;
    border-radius: 30px;
    cursor: pointer;
    box-shadow: 0 6px 20px rgba(238, 155, 0, 0.4);
    transition: all 0.2s ease;
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(238, 155, 0, 0.6);
}

/* Mobile Touch Controls */
.mobile-controls {
    display: none;
    width: 100%;
    justify-content: space-between;
    align-items: center;
    padding: 8px 12px;
    margin-top: 4px;
}

.dpad {
    position: relative;
    width: 120px;
    height: 120px;
}

.dbtn {
    position: absolute;
    width: 38px;
    height: 38px;
    background: rgba(244, 211, 94, 0.15);
    border: 1px solid rgba(244, 211, 94, 0.35);
    border-radius: var(--radius-sm);
    color: var(--color-gold-bright);
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.dbtn-up { top: 0; left: 41px; }
.dbtn-down { bottom: 0; left: 41px; }
.dbtn-left { top: 41px; left: 0; }
.dbtn-right { top: 41px; right: 0; }
.dbtn-center {
    position: absolute;
    top: 41px;
    left: 41px;
    width: 38px;
    height: 38px;
    background: rgba(43, 31, 23, 0.6);
    border-radius: var(--radius-sm);
}

.skill-touch-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 72px;
    height: 72px;
    border-radius: 50%;
    background: radial-gradient(circle, #e63946 0%, #9b2226 100%);
    border: 2px solid var(--color-gold-bright);
    color: #fff;
    box-shadow: 0 0 15px rgba(230, 57, 70, 0.6);
}

.skill-icon {
    font-size: 22px;
}

.skill-label {
    font-size: 10px;
    font-weight: 700;
}

/* Footer & Tips */
.game-footer {
    display: flex;
    justify-content: space-between;
    gap: 12px;
    width: 100%;
    font-size: 11px;
    color: var(--color-text-sub);
    padding: 6px 0;
}

.tip-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

.tip-badge {
    padding: 2px 6px;
    background: rgba(244, 211, 94, 0.15);
    border: 1px solid rgba(244, 211, 94, 0.3);
    border-radius: 4px;
    color: var(--color-gold-bright);
    font-weight: 600;
}

/* Responsive Media Queries */
@media (max-height: 700px) {
    .app-container { padding: 4px 8px; }
    .header-title h1 { font-size: 18px; }
    .hud-val { font-size: 16px; }
    .game-footer { display: none; }
}

@media (max-width: 600px) {
    .mobile-controls { display: flex; }
    .game-footer { display: none; }
    .header-title .subtitle { display: none; }
    .modal-card { max-width: 90%; padding: 20px 16px; }
    .modal-title { font-size: 22px; }
}