/* ===== 全局重置 & 水墨基调 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
:root {
    --paper: #F7F2EA;        /* 宣纸白 */
    --ink: #1F1B16;          /* 浓墨 */
    --ink-soft: #4A4239;     /* 淡墨 */
    --ink-muted: #8A8275;    /* 灰墨 */
    --line: #E6DCCB;         /* 细线色 */
    --line-strong: #C9BBA3;  /* 较深线色 */
    --cinnabar: #9C3A2A;     /* 朱砂（克制使用） */
    --card: #FCFAF5;         /* 卡片底 */
    --radius: 4px;           /* 统一小圆角，端庄 */
    --radius-lg: 8px;
}
html { -webkit-text-size-adjust: 100%; }
body {
    background-color: var(--paper);
    color: var(--ink);
    line-height: 1.8;
    letter-spacing: 0.02em;
    font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Songti SC", "STSong", serif;
    min-height: 100vh;
    padding: 4rem 1.5rem;
    -webkit-font-smoothing: antialiased;
}

/* 极淡水墨晕染，仅作氛围 */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    background:
        radial-gradient(circle at 85% 8%, rgba(156, 58, 42, 0.035) 0%, transparent 38%),
        radial-gradient(circle at 8% 95%, rgba(31, 27, 22, 0.025) 0%, transparent 42%);
    pointer-events: none;
    z-index: 0;
}

.container {
    max-width: 1080px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
    background: rgba(252, 250, 245, 0.85);
    padding: 4rem 3.5rem;
    border: 1px solid var(--line);
    box-shadow: 0 1px 0 rgba(31, 27, 22, 0.02), 0 24px 60px -32px rgba(31, 27, 22, 0.08);
}

/* ===== 通用组件 ===== */
h1, h2, h3 {
    font-weight: 600;
    letter-spacing: 0.08em;
    color: var(--ink);
}
h1 {
    font-size: 2.4rem;
    line-height: 1.2;
    margin-bottom: 0;
}
h2 {
    font-size: 1.5rem;
    position: relative;
    display: inline-block;
    margin-bottom: 2.5rem;
    color: var(--ink);
}
/* 章节标题：极简朱砂小点 + 黑字，无下划线 */
.section-tag {
    text-align: center;
    margin: 5rem 0 1.5rem;
}
.section-tag h2 {
    margin-bottom: 2.5rem;
}
.section-tag h2::before {
    content: '';
    display: block;
    width: 6px;
    height: 6px;
    margin: 0 auto 1.2rem;
    background: var(--cinnabar);
    border-radius: 50%;
}

/* 卡片：细线 + 微阴影，更克制 */
.card {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 2rem 1.8rem;
    border: 1px solid var(--line);
    transition: border-color 0.3s ease, transform 0.3s ease;
}
.card:hover {
    border-color: var(--line-strong);
    transform: translateY(-2px);
}

/* logo */
.logo {
    width: 88px;
    height: 88px;
    border-radius: var(--radius);
    object-fit: contain;
    margin: 0 auto;
    display: block;
}

/* ===== 头部 ===== */
header {
    text-align: center;
    margin-bottom: 3.5rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--line);
}
header .logo {
    margin-bottom: 1.6rem;
}
.header-text h1 {
    letter-spacing: 0.18em;
}
.header-text .sub-en {
    display: block;
    margin-top: 0.6rem;
    font-size: 0.78rem;
    letter-spacing: 0.32em;
    color: var(--ink-muted);
    text-transform: uppercase;
    font-weight: 400;
}

/* ===== 简介 ===== */
.intro-card {
    margin: 0 auto;
    padding: 0 0.5rem;
    text-align: justify;
    text-align-last: center;
}
.intro-card p {
    font-size: 1.05rem;
    color: var(--ink-soft);
    line-height: 2;
    text-indent: 2em;
}
.intro-card strong {
    color: var(--ink);
    font-weight: 600;
}
.intro-card .author {
    margin-top: 1.4rem;
    font-size: 0.86rem;
    color: var(--ink-muted);
    letter-spacing: 0.1em;
    text-align: center;
    text-indent: 0;
}

/* ===== 作品展示 ===== */
.works-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
}
.work-item {
    text-align: center;
}
.work-placeholder {
    aspect-ratio: 3 / 4;
    background: #F0E8DA;
    border: 1px solid var(--line);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--ink-muted);
    margin-bottom: 1rem;
    transition: 0.3s;
}
.work-placeholder span {
    font-size: 0.95rem;
    letter-spacing: 0.25em;
    color: var(--ink-soft);
    font-weight: 400;
}
.work-item:hover .work-placeholder {
    background: #ECE2D0;
    border-color: var(--line-strong);
}
.work-title {
    font-weight: 500;
    font-size: 1rem;
    color: var(--ink);
    letter-spacing: 0.04em;
}
.work-year {
    font-size: 0.82rem;
    color: var(--ink-muted);
    margin-top: 0.25rem;
    letter-spacing: 0.08em;
}

/* ===== 课程 ===== */
.course-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
}
.course-card {
    padding: 0;
    overflow: hidden;
    background: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    transition: border-color 0.3s ease, transform 0.3s ease;
}
.course-card:hover {
    border-color: var(--cinnabar);
    transform: translateY(-2px);
}
.course-cover {
    width: 100%;
    height: auto;
    display: block;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
}
.course-body {
    padding: 1.4rem 1.4rem 1.6rem;
    text-align: left;
}
.course-card h3 {
    font-size: 1.15rem;
    margin-bottom: 0.3rem;
    letter-spacing: 0.06em;
    color: var(--ink);
}
.course-card .desc {
    font-size: 0.85rem;
    color: var(--ink-muted);
    margin-bottom: 0.6rem;
    letter-spacing: 0.04em;
}
.course-card .audience {
    font-size: 0.8rem;
    color: var(--ink-soft);
    margin-bottom: 1rem;
    padding: 0.45rem 0.7rem;
    background: rgba(156, 58, 42, 0.05);
    border-left: 2px solid var(--cinnabar);
    letter-spacing: 0.02em;
}
.course-meta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1.2rem;
    padding-bottom: 1.1rem;
    border-bottom: 1px solid var(--line);
}
.course-card .price {
    font-size: 1.35rem;
    font-weight: 600;
    color: var(--cinnabar);
    letter-spacing: 0.02em;
}
.course-card .price-unit {
    font-size: 0.78rem;
    color: var(--ink-muted);
    font-weight: 400;
    margin-left: 0.15rem;
}
.course-card .badge {
    font-size: 0.72rem;
    color: var(--ink-soft);
    letter-spacing: 0.2em;
    font-weight: 400;
}
.btn-trial {
    display: block;
    text-align: center;
    padding: 0.7rem 0;
    background: transparent;
    color: var(--ink);
    border: 1px solid var(--ink);
    border-radius: var(--radius);
    font-size: 0.9rem;
    letter-spacing: 0.2em;
    text-decoration: none;
    transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}
.btn-trial:hover {
    background: var(--ink);
    color: var(--paper);
    border-color: var(--ink);
}

/* ===== 社交平台 ===== */
.social-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 1.2rem;
}
.social-item {
    text-align: center;
    padding: 1.8rem 0.6rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--line);
    transition: 0.3s;
}
.social-item:hover {
    border-color: var(--line-strong);
    transform: translateY(-2px);
}
.qrcode-mock {
    width: 110px;
    height: 110px;
    background: repeating-linear-gradient(0deg, #1F1B16 0px, #1F1B16 3px, #F7F2EA 3px, #F7F2EA 6px);
    border-radius: var(--radius);
    margin: 0 auto 0.9rem;
    border: 1px solid var(--line-strong);
}
.social-item:hover .qrcode-mock {
    opacity: 0.85;
}
.qrcode-img {
    display: block;
    width: 130px;
    height: 130px;
    object-fit: contain;
    border-radius: var(--radius);
    margin: 0 auto 0.9rem;
    border: 1px solid var(--line-strong);
}
.social-item:hover .qrcode-img {
    opacity: 0.85;
}
.social-name {
    font-size: 0.88rem;
    color: var(--ink-soft);
    letter-spacing: 0.06em;
}

/* ===== FAQ ===== */
.faq-list {
    max-width: 760px;
    margin: 2rem auto 0.5rem;
}
details {
    border-bottom: 1px solid var(--line);
    padding: 1.4rem 0;
    transition: 0.2s;
}
details:first-of-type {
    border-top: 1px solid var(--line);
}
summary {
    font-weight: 500;
    font-size: 1.02rem;
    color: var(--ink);
    outline: none;
    cursor: pointer;
    list-style: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    letter-spacing: 0.04em;
}
summary::-webkit-details-marker { display: none; }
summary::after {
    content: '+';
    font-size: 1.4rem;
    color: var(--cinnabar);
    font-weight: 300;
    transition: transform 0.25s ease;
    line-height: 1;
}
details[open] summary::after {
    content: '−';
}
details p {
    margin-top: 1rem;
    color: var(--ink-soft);
    font-size: 0.96rem;
    line-height: 1.9;
}

/* ===== footer ===== */
footer {
    margin-top: 5rem;
    padding-top: 2rem;
    border-top: 1px solid var(--line);
    text-align: center;
    font-size: 0.86rem;
    color: var(--ink-muted);
    letter-spacing: 0.06em;
}
footer p + p {
    margin-top: 0.4rem;
    font-size: 0.78rem;
    opacity: 0.75;
}
.json-ld-hide { display: none; }

/* ===== 响应式 ===== */
@media (max-width: 720px) {
    body { padding: 1.5rem 1rem; }
    .container { padding: 2.5rem 1.5rem; }
    h1 { font-size: 1.9rem; }
    h2 { font-size: 1.3rem; }
    .works-grid { grid-template-columns: 1fr 1fr; }
    .course-grid { grid-template-columns: 1fr; }
    .social-grid { grid-template-columns: repeat(3, 1fr); }
    .section-tag { margin: 3.5rem 0 1.5rem; }
}
@media (max-width: 420px) {
    .works-grid { grid-template-columns: 1fr; }
    .social-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== 预约咨询弹窗 ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(31, 27, 22, 0.55);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
    padding: 1rem;
}
.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}
.modal {
    background: var(--card);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem 2rem;
    max-width: 360px;
    width: 100%;
    position: relative;
    text-align: center;
    border: 1px solid var(--line);
    box-shadow: 0 20px 60px -20px rgba(31, 27, 22, 0.25);
    transform: translateY(20px) scale(0.97);
    transition: transform 0.25s ease;
}
.modal-overlay.active .modal {
    transform: translateY(0) scale(1);
}
.modal-close {
    position: absolute;
    top: 0.6rem;
    right: 0.9rem;
    background: none;
    border: none;
    font-size: 1.6rem;
    color: var(--ink-muted);
    cursor: pointer;
    line-height: 1;
    padding: 0.2rem 0.4rem;
    border-radius: var(--radius);
    transition: color 0.2s ease, background 0.2s ease;
}
.modal-close:hover {
    color: var(--ink);
    background: rgba(31, 27, 22, 0.05);
}
.modal-title {
    font-size: 1.25rem;
    margin-bottom: 1.4rem;
    letter-spacing: 0.12em;
    color: var(--ink);
}
.modal-qrcode {
    width: 200px;
    height: 200px;
    object-fit: contain;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    margin: 0 auto 1.4rem;
    display: block;
    background: var(--paper);
}
.modal-steps p {
    font-size: 0.95rem;
    color: var(--ink-soft);
    letter-spacing: 0.04em;
    line-height: 1.8;
}
.modal-steps .modal-sub {
    margin-top: 0.4rem;
    font-weight: 500;
    color: var(--cinnabar);
    letter-spacing: 0.08em;
}

@media (max-width: 420px) {
    .modal {
        padding: 2rem 1.2rem 1.6rem;
    }
    .modal-qrcode {
        width: 180px;
        height: 180px;
    }
}