/*
  乐造网站样式 v2
  遵循 SuperDesign 规范
*/

/* ====== 基础重置 ====== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--foreground);
    background: var(--background);
    min-height: 100vh;
}

/* ====== 布局容器 ====== */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ====== 头部 ====== */
.header {
    background: linear-gradient(135deg, var(--secondary) 0%, color-mix(in oklch, var(--secondary), black 15%) 100%);
    color: white;
    padding: 3rem 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.header::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, color-mix(in oklch, var(--primary), transparent 70%) 0%, transparent 50%);
    opacity: 0.3;
}

.header > .container {
    position: relative;
    z-index: 1;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: -0.02em;
}

.header .subtitle {
    font-size: 1.1rem;
    opacity: 0.9;
    font-weight: 400;
}

/* ====== 主要内容 ====== */
main {
    padding: 3rem 1.5rem;
}

section {
    margin-bottom: 3.5rem;
}

section h2 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--foreground);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 3px solid var(--primary);
    display: inline-block;
    letter-spacing: -0.01em;
}

/* ====== 介绍区块 ====== */
.intro {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    border: 1px solid var(--border);
}

.intro p {
    color: var(--muted);
    font-size: 1.1rem;
    max-width: 700px;
    margin: 0 auto;
}

/* ====== 课程网格 ====== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.course-card {
    background: var(--surface);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-decoration: none;
    color: inherit;
    border: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    cursor: pointer;
    /* Animation: 200ms [Y0→-4, shadow↗] */
    transform: translateY(0);
    transition: transform 200ms ease, box-shadow 200ms ease, border-color 200ms ease;
}

.course-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary);
}

.course-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    line-height: 1;
}

.course-card h3 {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.course-card p {
    color: var(--muted);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.tag {
    display: inline-block;
    background: var(--primary);
    color: var(--primary-foreground);
    padding: 0.35rem 1rem;
    border-radius: 999px;
    font-size: 0.8rem;
    font-weight: 500;
}

/* ====== 快捷入口 ====== */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
}

.link-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    cursor: pointer;
    transition: transform 200ms ease, box-shadow 200ms ease;
}

.link-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

.link-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 0.5rem;
}

.link-card p {
    font-size: 0.9rem;
    color: var(--muted);
}

/* ====== 弹窗 ====== */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    /* Animation: fadeIn 300ms */
    animation: fadeIn 300ms ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--surface);
    margin: 5% auto;
    border-radius: var(--radius);
    width: 90%;
    max-width: 800px;
    max-height: 85vh;
    overflow-y: auto;
    position: relative;
    box-shadow: var(--shadow-hover);
    /* Animation: slideIn 350ms */
    animation: slideIn 350ms ease-out;
}

@keyframes slideIn {
    from { transform: translateY(-30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.close {
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 2rem;
    font-weight: 300;
    color: var(--muted);
    cursor: pointer;
    z-index: 10;
    line-height: 1;
}

.close:hover {
    color: var(--primary);
}

/* ====== 课程详情 ====== */
.course-detail {
    padding: 2rem;
}

.detail-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--border);
}

.detail-icon {
    font-size: 4rem;
    line-height: 1;
}

.detail-header h2 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--foreground);
    margin-bottom: 0.25rem;
    border: none;
    padding: 0;
}

.detail-subtitle {
    color: var(--muted);
    font-size: 1.1rem;
}

.detail-section {
    margin-bottom: 2rem;
}

.detail-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--accent);
}

.course-desc {
    font-size: 1.05rem;
    line-height: 1.8;
    color: var(--muted);
    background: var(--background);
    padding: 1.25rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
}

/* ====== Q&A 列表 ====== */
.qa-list .qa-item {
    background: var(--background);
    padding: 1.25rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
    border-left: 4px solid var(--accent);
}

.qa-q {
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 0.75rem;
}

.qa-a {
    color: var(--muted);
    line-height: 1.7;
}

/* ====== 价格网格 ====== */
.price-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
}

.price-card {
    background: var(--surface);
    padding: 1.5rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    text-align: center;
    border: 2px solid var(--border);
    transition: border-color 200ms ease;
}

.price-card:hover {
    border-color: var(--primary);
}

.price-label {
    display: block;
    font-weight: 600;
    color: var(--foreground);
    margin-bottom: 0.5rem;
    font-size: 0.95rem;
}

.price-value {
    display: block;
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
}

/* ====== 话术列表 ====== */
.speech-list {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.speech-item {
    background: color-mix(in oklch, var(--primary) 8%, var(--surface));
    padding: 1.25rem;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary);
}

.speech-label {
    display: block;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
}

.speech-item p {
    color: var(--muted);
    line-height: 1.7;
}

/* ====== 底部 ====== */
.footer {
    background: var(--secondary);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}

.footer p {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* ====== 响应式 ====== */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.75rem;
    }
    
    .header .subtitle {
        font-size: 1rem;
    }
    
    .course-grid,
    .link-grid,
    .price-grid {
        grid-template-columns: 1fr;
    }
    
    .modal-content {
        margin: 10% auto;
        width: 95%;
    }
    
    .detail-header {
        flex-direction: column;
        text-align: center;
    }
}

/* ====== 按钮基础样式 ====== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius);
    font-weight: 500;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: transform 150ms ease, box-shadow 150ms ease;
    /* button: 150ms [S1→0.95→1] */
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    background: var(--primary);
    color: var(--primary-foreground);
}

.btn-primary:hover {
    box-shadow: var(--shadow-hover);
}

/* ====== 输入框 ====== */
input[type="text"],
input[type="password"],
textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-family: inherit;
    color: var(--foreground);
    background: var(--surface);
    transition: border-color 200ms ease;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--primary);
}

textarea {
    min-height: 80px;
    resize: vertical;
}