/* ===== CSS Variables & Reset ===== */
:root {
    --color-bg: #f8fafc;
    --color-bg-card: #ffffff;
    --color-primary: #6366f1;
    --color-primary-light: #818cf8;
    --color-primary-dark: #4f46e5;
    --color-secondary: #e0e7ff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-text-muted: #94a3b8;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-danger: #ef4444;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --transition-fast: 0.15s ease;
    --transition-normal: 0.25s ease;
    --transition-slow: 0.4s ease;

    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}

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

html,
body {
    height: 100%;
    overflow: hidden;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    /* iOS 安全区域适配 */
    padding-bottom: env(safe-area-inset-bottom, 0);
}

/* ===== Container ===== */
.container {
    width: 100%;
    height: 100vh;
    position: relative;
    overflow: hidden;
}

/* ===== Settings Panel ===== */
.settings-panel {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    padding-bottom: calc(100px + env(safe-area-inset-bottom, 0px));
    /* 更大的底部安全区域 */
    background: linear-gradient(135deg, #f0f4ff 0%, #faf5ff 50%, #f0fdfa 100%);
    z-index: 10;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
    overflow-y: auto;
    /* 允许滚动 */
}

.settings-panel.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
}

.settings-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: 40px;
    width: 100%;
    max-width: 420px;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.5s ease;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Logo */
.logo {
    text-align: center;
    margin-bottom: 36px;
}

.logo-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    color: var(--color-primary);
    animation: pulse 2s infinite;
}

@keyframes pulse {

    0%,
    100% {
        transform: scale(1);
        opacity: 1;
    }

    50% {
        transform: scale(1.05);
        opacity: 0.8;
    }
}

.logo h1 {
    font-size: 28px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 4px;
}

.logo .subtitle {
    font-size: 14px;
    color: var(--color-text-muted);
    font-weight: 400;
}

/* Settings Groups */
.settings-group {
    margin-bottom: 24px;
}

.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
}

.label-text {
    font-size: 14px;
    font-weight: 500;
    color: var(--color-text);
}

.label-value {
    font-size: 13px;
    color: var(--color-primary);
    font-weight: 500;
}

/* Speed & Size Options */
.speed-options,
.size-options {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
}

.speed-btn,
.size-btn {
    flex: 1;
    min-width: fit-content;
    padding: 10px 16px;
    border: 1.5px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

/* Duration Slider */
.slider-container {
    padding: 8px 0;
}

.duration-slider {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--color-border);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.duration-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.duration-slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.5);
}

.duration-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border: none;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    cursor: pointer;
    box-shadow: 0 2px 8px rgba(99, 102, 241, 0.4);
}

.slider-ticks {
    display: flex;
    justify-content: space-between;
    padding: 8px 2px 0;
}

.slider-ticks .tick {
    font-size: 11px;
    color: var(--color-text-muted);
    font-weight: 500;
    width: 16px;
    text-align: center;
    cursor: pointer;
    transition: color var(--transition-fast);
}

.slider-ticks .tick:hover {
    color: var(--color-primary);
}

.slider-ticks .tick.active {
    color: var(--color-primary);
    font-weight: 600;
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    padding-top: 4px;
    font-size: 11px;
    color: var(--color-text-muted);
}

.speed-btn:hover,
.size-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
    background: var(--color-secondary);
}

.speed-btn.active,
.size-btn.active {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: white;
}

/* Start Button */
.start-btn {
    width: 100%;
    padding: 16px 24px;
    border: none;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all var(--transition-fast);
    font-family: inherit;
    margin-top: 32px;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

.start-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

.start-btn:active {
    transform: translateY(0);
}

.start-btn .btn-icon {
    width: 20px;
    height: 20px;
}

/* Tip */
.tip {
    margin-top: 20px;
    margin-bottom: 20px;
    /* 增加底部边距 */
    text-align: center;
    font-size: 12px;
    color: var(--color-text-muted);
    padding: 12px;
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}

/* ===== Training Area ===== */
.training-area {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, #f0f4ff 0%, #fafbff 100%);
    display: flex;
    flex-direction: column;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-normal);
}

.training-area.active {
    opacity: 1;
    pointer-events: auto;
}

/* Status Bar */
.status-bar {
    position: absolute;
    top: 24px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 12px 20px;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    z-index: 10;
}

.timer {
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--color-text);
    font-size: 18px;
    font-weight: 600;
    font-variant-numeric: tabular-nums;
}

.timer svg {
    width: 22px;
    height: 22px;
    color: var(--color-primary);
}

.control-btn {
    width: 40px;
    height: 40px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-bg);
    color: var(--color-text-secondary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.control-btn:hover {
    background: var(--color-secondary);
    color: var(--color-primary);
}

.control-btn svg {
    width: 20px;
    height: 20px;
}

.stop-btn:hover {
    background: #fef2f2;
    color: var(--color-danger);
}

.hidden {
    display: none !important;
}

/* Training Tip */
.training-tip {
    position: absolute;
    bottom: calc(24px + env(safe-area-inset-bottom, 0px));
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    z-index: 10;
    animation: fadeInUp 0.5s ease 0.3s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateX(-50%) translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateX(-50%) translateY(0);
    }
}

.training-tip svg {
    width: 20px;
    height: 20px;
    color: var(--color-primary);
}

.training-tip span {
    font-size: 13px;
    color: var(--color-text-secondary);
    font-weight: 500;
}

/* Canvas - 确保不被拉伸 */
#ballCanvas {
    flex: 1;
    width: 100%;
    /* 确保 canvas 不被 CSS 拉伸，保持实际像素尺寸 */
    display: block;
}

/* Progress Bar */
.progress-bar {
    position: absolute;
    bottom: env(safe-area-inset-bottom, 0);
    left: 0;
    right: 0;
    height: 4px;
    background: rgba(99, 102, 241, 0.1);
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    width: 0%;
    /* 使用 JS 实时更新实现平滑效果 */
}

/* ===== Complete Panel ===== */
.complete-panel {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(135deg, #ecfdf5 0%, #f0fdf4 50%, #f0f9ff 100%);
    z-index: 20;
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.complete-panel.hidden {
    opacity: 0;
    pointer-events: none;
    transform: scale(0.95);
}

.complete-card {
    background: var(--color-bg-card);
    border-radius: var(--radius-xl);
    padding: 48px 40px;
    width: 100%;
    max-width: 400px;
    text-align: center;
    box-shadow: var(--shadow-xl);
    animation: scaleIn 0.4s ease;
}

@keyframes scaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }

    to {
        opacity: 1;
        transform: scale(1);
    }
}

.complete-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 24px;
    color: var(--color-success);
    animation: checkBounce 0.5s ease 0.2s both;
}

@keyframes checkBounce {
    0% {
        transform: scale(0);
    }

    50% {
        transform: scale(1.2);
    }

    100% {
        transform: scale(1);
    }
}

.complete-card h2 {
    font-size: 24px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 12px;
}

.complete-message {
    font-size: 15px;
    color: var(--color-text-secondary);
    margin-bottom: 8px;
}

.complete-tip {
    font-size: 14px;
    color: var(--color-text-muted);
    margin-bottom: 32px;
}

.complete-actions {
    display: flex;
    gap: 12px;
}

.restart-btn,
.settings-btn {
    flex: 1;
    padding: 14px 20px;
    border: none;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.restart-btn {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    box-shadow: 0 4px 14px rgba(99, 102, 241, 0.3);
}

.restart-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(99, 102, 241, 0.4);
}

.settings-btn {
    background: var(--color-bg);
    color: var(--color-text-secondary);
    border: 1.5px solid var(--color-border);
}

.settings-btn:hover {
    border-color: var(--color-primary-light);
    color: var(--color-primary);
    background: var(--color-secondary);
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
    .settings-card {
        padding: 28px 24px;
        margin-bottom: 60px;
        /* 给底部留出空间避免被裁剪 */
    }

    .logo h1 {
        font-size: 24px;
    }

    .duration-btn,
    .speed-btn,
    .size-btn {
        padding: 8px 12px;
        font-size: 12px;
    }

    .status-bar {
        padding: 10px 16px;
        gap: 12px;
    }

    .timer {
        font-size: 16px;
    }

    .complete-card {
        padding: 36px 24px;
    }

    .complete-actions {
        flex-direction: column;
    }

    /* 训练提示移动端适配 */
    .training-tip {
        bottom: calc(120px + env(safe-area-inset-bottom, 0px));
        /* 大幅增加底部距离 */
        padding: 10px 16px;
        gap: 8px;
        max-width: 90%;
    }

    .training-tip svg {
        width: 16px;
        height: 16px;
        flex-shrink: 0;
    }

    .training-tip span {
        font-size: 12px;
        line-height: 1.4;
    }
}