/**
 * 全局样式和布局 - 舒尔特方格训练
 * 设计系统：极简单列 + 微交互 + Teal 青绿配色
 */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');

:root {
    /* 清爽浅蓝配色 */
    --primary-color: #3B82F6;
    --primary-hover: #2563EB;
    --primary-light: #DBEAFE;
    --secondary-color: #60A5FA;
    --cta-color: #F97316;
    --cta-hover: #EA580C;
    --danger-color: #EF4444;
    --success-color: #10B981;

    --text-primary: #1E3A5F;
    --text-secondary: #93C5FD;
    --text-muted: #6B7280;

    --bg-primary: #F0F7FF;
    --bg-secondary: #FFFFFF;
    --bg-elevated: #FFFFFF;

    /* 棋盘柔和浅蓝 */
    --grid-bg: #BFDBFE;
    --grid-hover: #93C5FD;

    --border-color: #DBEAFE;
    --border-subtle: #F0F7FF;
    --border-radius: 16px;
    --box-shadow-sm: 0 1px 2px rgba(59, 130, 246, 0.05);
    --box-shadow: 0 4px 6px -1px rgba(59, 130, 246, 0.1), 0 2px 4px -1px rgba(59, 130, 246, 0.06);
    --box-shadow-lg: 0 10px 15px -3px rgba(59, 130, 246, 0.1), 0 4px 6px -2px rgba(59, 130, 246, 0.05);
    --transition-fast: all 100ms ease;
    --transition: all 200ms ease;
    --transition-slow: all 300ms ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #F0F7FF 0%, #DBEAFE 100%);
    color: var(--text-primary);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: clamp(10px, 2vh, 20px);
}

.app-container {
    max-width: 600px;
    width: 100%;
    background: var(--bg-secondary);
    border-radius: clamp(14px, 3vh, 24px);
    box-shadow: var(--box-shadow-lg);
    padding: clamp(16px, 3vh, 32px);
    border: 1px solid var(--border-color);
}

/* 按钮样式 - 微交互优化 */
.btn {
    padding: 14px 28px;
    border: none;
    border-radius: 12px;
    font-size: 15px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition-fast);
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
}

.btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.btn.primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-hover) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.25);
}

.btn.primary:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.35);
}

.btn.primary:active:not(:disabled) {
    transform: translateY(0);
}

.btn.secondary {
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
}

.btn.secondary:hover:not(:disabled) {
    background: var(--border-color);
    border-color: var(--primary-color);
}

.btn.text {
    background: transparent;
    color: var(--primary-color);
    padding: 10px 16px;
    border-radius: 8px;
}

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

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none !important;
}

/* 标签样式 */
.label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 6px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* 模态框样式 - 现代简约 */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(30, 58, 95, 0.4);
    backdrop-filter: blur(8px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal.active {
    display: flex;
    animation: fadeIn 200ms ease-out;
}

.modal-content {
    background: var(--bg-secondary);
    border-radius: 24px;
    max-width: 480px;
    width: 100%;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: var(--box-shadow-lg);
    border: 1px solid var(--border-color);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px;
    border-bottom: 1px solid var(--border-subtle);
}

.modal-header h2 {
    font-size: 22px;
    font-weight: 700;
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
}

.close-btn {
    background: var(--bg-primary);
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--text-muted);
    line-height: 1;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    transition: var(--transition-fast);
}

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

.close-btn:focus-visible {
    outline: 2px solid var(--primary-color);
    outline-offset: 2px;
}

.modal-body {
    padding: 24px;
}

/* 模态框操作区 */
.modal-actions {
    display: flex;
    gap: 12px;
    justify-content: center;
    padding: 20px 24px;
    border-top: 1px solid var(--border-subtle);
}

/* 完成动画 - 微交互优化 */
.complete-animation {
    text-align: center;
    padding: 24px;
}

.success-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto 16px;
    background: linear-gradient(135deg, var(--success-color) 0%, #059669 100%);
    color: white;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 40px;
    animation: successPop 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 8px 24px rgba(59, 130, 246, 0.3);
}

@keyframes successPop {
    0% {
        transform: scale(0) rotate(-45deg);
        opacity: 0;
    }
    50% {
        transform: scale(1.1) rotate(10deg);
    }
    100% {
        transform: scale(1) rotate(0deg);
        opacity: 1;
    }
}

.complete-animation h2 {
    font-size: 26px;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-weight: 700;
    font-family: 'Inter', sans-serif;
}

.completion-difficulty {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-secondary);
    font-family: 'Inter', sans-serif;
    margin: 8px 0;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.completion-time {
    font-size: 42px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: 'Courier New', monospace;
    margin: 16px 0;
    letter-spacing: -2px;
}

.new-record {
    color: var(--cta-color);
    font-weight: 700;
    font-size: 16px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    animation: bounce 500ms ease infinite;
}

.new-record::before {
    content: '🎉';
    font-size: 18px;
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-4px);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}