/* ============================================================
   精灵星空 · 产品页通用样式 (products.css)
   供 /products/*.html 引用。主题色通过 CSS 变量控制，
   默认赛博青蓝；特殊产品（如 MathArt）可在页面覆盖。
   ============================================================ */

/* ---------- 基础与呼吸星空背景 ---------- */
body {
    position: relative;
    background-color: #0b0e14;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    z-index: 0;
    scroll-behavior: smooth;
    margin: 0;
    color: #e8ebff;
}
body::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-image:
        radial-gradient(circle at 15% 50%, rgba(0, 229, 255, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 85% 30%, rgba(189, 0, 255, 0.1) 0%, transparent 50%);
    z-index: -1;
    animation: breath 8s ease-in-out infinite alternate;
}
@keyframes breath {
    0%   { opacity: 0.6; transform: scale(0.95); }
    100% { opacity: 1;   transform: scale(1.05); }
}

/* ---------- 主题色变量（默认青蓝，可被页面覆盖） ---------- */
:root {
    --accent-main: #00e5ff;
    --accent-glow: rgba(0, 229, 255, 0.4);
    --danger: #ef4444;
    --muted: #64748b;
}
:root[data-theme="light"] {
    --accent-main: #0284c7;
    --accent-glow: rgba(2, 132, 199, 0.2);
    --danger: #dc2626;
}

/* ---------- 毛玻璃主容器 ---------- */
.container {
    background: rgba(16, 24, 40, 0.6) !important;
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
    border-radius: 24px !important;
    box-shadow: 0 10px 40px rgba(0,0,0,0.3) !important;
    margin-top: 4vh !important;
    margin-bottom: 4vh !important;
    padding: 40px clamp(20px, 4vw, 50px) !important;
    max-width: 960px;
    margin-left: auto;
    margin-right: auto;
}

/* ---------- 标题流光渐变 ---------- */
h1 {
    font-size: clamp(32px, 5vw, 42px) !important;
    font-weight: 800;
    background: linear-gradient(135deg, #00ffff, #0072ff, #bd00ff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: textShine 4s linear infinite;
    background-size: 200% auto;
    text-shadow: none !important;
    margin-bottom: 10px !important;
    text-align: center;
}
@keyframes textShine { to { background-position: 200% center; } }

.tagline {
    text-align: center;
    color: var(--accent-main);
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 30px;
    letter-spacing: 1px;
    line-height: 1.6;
}

/* ---------- 顶栏面包屑 + 主题切换 ---------- */
.header-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    flex-wrap: wrap;
    gap: 15px;
}
.header-bar a {
    color: var(--accent-main);
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: color 0.3s ease;
    text-decoration: none;
}
.header-bar a:hover { color: #fff; text-decoration: none; }

#theme-toggle {
    background: rgba(255, 255, 255, 0.08);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: #fff;
    padding: 8px 16px;
    border-radius: 30px;
    font-size: 13px;
    cursor: pointer;
    transition: 0.3s;
    display: flex;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(5px);
    font-weight: 600;
    position: static !important;
    margin: 0 !important;
}
#theme-toggle:hover {
    background: var(--accent-main);
    color: #0b0e14;
    border-color: var(--accent-main);
    box-shadow: 0 0 15px var(--accent-glow);
    transform: translateY(-2px);
}

hr {
    border: none;
    border-top: 1px solid rgba(255,255,255,0.1) !important;
    margin: 30px 0 !important;
}

/* ---------- 快速导航 TOC ---------- */
.toc-nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
}
.toc-nav a {
    background: rgba(0, 229, 255, 0.1);
    color: var(--accent-main);
    padding: 8px 20px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9rem;
    border: 1px solid rgba(0, 229, 255, 0.2);
    transition: all 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}
.toc-nav a:hover {
    background: var(--accent-main);
    color: #0b0e14;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px var(--accent-glow);
}

/* ---------- 卡片网格 ---------- */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 30px;
}
.glass-card {
    background: rgba(255,255,255,0.03);
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 16px;
    padding: clamp(20px, 4vw, 40px);
    transition: all 0.3s ease;
    position: relative;
    overflow: hidden;
    scroll-margin-top: 20px;
}
.glass-card:hover {
    background: rgba(255,255,255,0.06);
    border-color: rgba(0, 229, 255, 0.3);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.glass-card h2 {
    border-left: none !important;
    padding-left: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 20px !important;
    color: var(--accent-main) !important;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.5rem !important;
    font-weight: 700;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    padding-bottom: 15px !important;
}
.glass-card h3 {
    color: #e8ebff;
    font-size: 1.15rem;
    margin-top: 25px;
    margin-bottom: 12px;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 8px;
}
.glass-card h4 {
    color: #e8ebff;
    font-size: 1.05rem;
    margin-top: 0;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.glass-card p,
.glass-card li {
    color: #94a3b8 !important;
    line-height: 1.8;
    font-size: 0.98rem;
}
.glass-card ul,
.glass-card ol {
    margin-top: 10px;
    margin-bottom: 20px;
    padding-left: 20px;
}
.glass-card li { margin-bottom: 8px; }

.highlight-text {
    color: var(--accent-main);
    font-weight: 600;
}

/* ---------- 特性小卡片网格 ---------- */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-top: 20px;
}
.feature-grid.cols-3 {
    grid-template-columns: repeat(3, 1fr);
}
.feature-box {
    background: rgba(0, 229, 255, 0.05);
    border: 1px solid rgba(0, 229, 255, 0.15);
    padding: 20px;
    border-radius: 12px;
    transition: 0.3s;
}
.feature-box:hover {
    background: rgba(0, 229, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 5px 20px rgba(0, 229, 255, 0.15);
}
.feature-box h4 {
    color: #e8ebff;
    font-size: 1.05rem;
    margin-top: 0;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.feature-box p {
    margin: 0;
    font-size: 0.9rem !important;
    line-height: 1.6 !important;
}

/* ---------- 代码 / 快捷键 ---------- */
code, kbd {
    background: rgba(0, 229, 255, 0.15);
    color: var(--accent-main);
    padding: 3px 8px;
    border-radius: 6px;
    font-family: 'Consolas', monospace;
    font-size: 0.9em;
    border: 1px solid rgba(0, 229, 255, 0.2);
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.2);
    margin: 0 2px;
    display: inline-block;
}

/* ---------- 按钮组 ---------- */
.btn-group-custom {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
    margin: 20px 0;
}
.btn-main {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, #00c6ff, #0072ff);
    color: #fff !important;
    padding: 12px 24px;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: 0.3s;
    box-shadow: 0 4px 15px rgba(0, 114, 255, 0.3);
    border: none;
}
.btn-main:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 114, 255, 0.5);
    text-decoration: none;
}
.btn-outline {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.2);
    color: #e8ebff !important;
    box-shadow: none;
}
.btn-outline:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.4);
    box-shadow: none;
}

/* ---------- 图片步骤容器 ---------- */
.step-img-wrapper {
    margin-top: 25px;
    text-align: center;
    background: rgba(0,0,0,0.3);
    padding: 15px;
    border-radius: 16px;
    border: 1px solid rgba(255,255,255,0.05);
}
.step-img-wrapper img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.5);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: block;
    margin: 0 auto;
}
.step-img-wrapper img:hover {
    transform: scale(1.03);
    box-shadow: 0 8px 25px rgba(0,229,255,0.2);
}

/* ---------- 提示块 ---------- */
.note-box {
    background: rgba(0, 229, 255, 0.08);
    border-left: 4px solid var(--accent-main);
    padding: 15px 20px;
    border-radius: 8px;
    margin-top: 25px;
}
.note-box.danger {
    background: rgba(239, 68, 68, 0.08);
    border-left: 4px solid var(--danger);
}
.note-box p {
    margin: 0;
    color: #e8ebff !important;
}

/* ---------- 表格 ---------- */
.custom-table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 15px;
    font-size: 0.95rem;
    color: #e8ebff;
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
.custom-table th,
.custom-table td {
    padding: 12px 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}
.custom-table th {
    background-color: rgba(0, 229, 255, 0.1);
    color: var(--accent-main);
    font-weight: 600;
}
.custom-table tr:hover td {
    background-color: rgba(0, 229, 255, 0.05);
}
.custom-table tr:last-child td {
    border-bottom: none;
}

/* ---------- 说明页：章节标题 / 引言 / 两列网格 ---------- */
.section-title {
    color: var(--accent-main);
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 20px;
    margin-top: 40px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.intro-text {
    color: #94a3b8;
    font-size: 0.98rem;
    line-height: 1.8;
    margin-bottom: 30px;
    padding: 20px;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 12px;
    border-left: 4px solid var(--accent-main);
}
.grid-2-cols {
    grid-template-columns: 1fr;
}
@media (min-width: 768px) {
    .grid-2-cols {
        grid-template-columns: 1fr 1fr;
    }
}
:root[data-theme="light"] .section-title {
    color: var(--accent-main);
}
:root[data-theme="light"] .intro-text {
    background: #f1f5f9;
    border-left-color: var(--accent-main);
    color: #475569;
}

/* ---------- 路线图页面（时间线卡片风格） ---------- */
.roadmap-list {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0;
    position: relative;
    padding-left: 0;
}
/* 左侧时间线 */
.roadmap-list::before {
    content: '';
    position: absolute;
    left: 22px;
    top: 28px;
    bottom: 28px;
    width: 2px;
    background: linear-gradient(
        180deg,
        var(--accent-main) 0%,
        rgba(0, 229, 255, 0.25) 50%,
        rgba(189, 0, 255, 0.2) 100%
    );
    border-radius: 2px;
    z-index: 0;
}
.roadmap-item {
    position: relative;
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 16px;
    padding: 28px 28px 28px 64px;
    margin-bottom: 28px;
    transition: all 0.35s cubic-bezier(0.23, 1, 0.32, 1);
    overflow: visible;
    backdrop-filter: blur(8px);
}
.roadmap-item:last-child {
    margin-bottom: 0;
}
/* 时间线节点圆点 */
.roadmap-item::before {
    content: '';
    position: absolute;
    left: 14px;
    top: 36px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: #0b0e14;
    border: 3px solid var(--accent-main);
    box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.15), 0 0 16px rgba(0, 229, 255, 0.35);
    z-index: 1;
    transition: all 0.3s ease;
}
.roadmap-item:hover {
    transform: translateX(6px);
    background: rgba(255, 255, 255, 0.07);
    border-color: rgba(0, 229, 255, 0.4);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.25), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
.roadmap-item:hover::before {
    background: var(--accent-main);
    box-shadow: 0 0 0 6px rgba(0, 229, 255, 0.2), 0 0 24px rgba(0, 229, 255, 0.5);
}
.roadmap-item h2 {
    border-left: none !important;
    padding-left: 0 !important;
    margin-top: 0 !important;
    margin-bottom: 14px !important;
    color: #e8ebff !important;
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.35rem !important;
    font-weight: 700;
}
.roadmap-item h2 i {
    color: #0b0e14;
    font-size: 1rem;
    background: linear-gradient(135deg, var(--accent-main), #7aa2ff);
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    flex-shrink: 0;
    border: none;
    box-shadow: 0 4px 12px rgba(0, 229, 255, 0.3);
}
.roadmap-item p {
    color: #94a3b8 !important;
    line-height: 1.8;
    margin: 0;
    font-size: 0.98rem;
}
/* 亮色模式 */
:root[data-theme="light"] .roadmap-list::before {
    background: linear-gradient(
        180deg,
        var(--accent-main) 0%,
        rgba(2, 132, 199, 0.3) 50%,
        rgba(147, 51, 234, 0.2) 100%
    );
}
:root[data-theme="light"] .roadmap-item {
    background: #ffffff;
    border-color: #e2e8f0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
}
:root[data-theme="light"] .roadmap-item::before {
    background: #ffffff;
    border-color: var(--accent-main);
    box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.12);
}
:root[data-theme="light"] .roadmap-item:hover {
    border-color: var(--accent-main);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.08);
}
:root[data-theme="light"] .roadmap-item:hover::before {
    background: var(--accent-main);
    box-shadow: 0 0 0 6px rgba(2, 132, 199, 0.18);
}
:root[data-theme="light"] .roadmap-item h2 {
    color: #1e293b !important;
}
:root[data-theme="light"] .roadmap-item h2 i {
    color: #ffffff;
    background: linear-gradient(135deg, var(--accent-main), #2563eb);
    box-shadow: 0 4px 12px rgba(2, 132, 199, 0.25);
}
:root[data-theme="light"] .roadmap-item p {
    color: #475569 !important;
}
@media (max-width: 640px) {
    .roadmap-list::before {
        left: 14px;
    }
    .roadmap-item {
        padding: 22px 18px 22px 48px;
    }
    .roadmap-item::before {
        left: 6px;
        width: 16px;
        height: 16px;
        top: 32px;
    }
}


/* ---------- FAQ ---------- */
.faq-item {
    margin-bottom: 20px;
    padding-bottom: 20px;
    border-bottom: 1px dashed rgba(255,255,255,0.1);
}
.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}
.faq-q {
    color: var(--accent-main);
    font-weight: 600;
    font-size: 1.05rem;
    margin-bottom: 8px;
    display: flex;
    align-items: flex-start;
    gap: 8px;
}
.faq-a {
    color: #94a3b8;
    line-height: 1.7;
    padding-left: 28px;
}

/* ---------- 页脚（已优化链接对比度） ---------- */
footer {
    margin-top: 4vh;
    text-align: center;
    color: #94a3b8;
    font-size: 0.9rem;
    line-height: 1.8;
}
footer a {
    color: var(--accent-main);
    font-weight: 500;
    text-decoration: none;
    transition: color 0.2s ease, opacity 0.2s ease;
}
footer a:hover {
    color: #ffffff;
    text-decoration: underline;
}
.footer-extra-links a {
    margin: 0 10px;
}
.footer-highlight {
    color: var(--accent-main);
    font-weight: 600;
}

/* ============================================================
   亮色模式覆盖
   ============================================================ */
:root[data-theme="light"] body {
    background-color: #f8fafc;
    color: #1e293b;
}
:root[data-theme="light"] body::before {
    background-image: none;
}
:root[data-theme="light"] .container {
    background: rgba(255, 255, 255, 0.9) !important;
    border-color: #cbd5e1 !important;
    box-shadow: 0 10px 40px rgba(0,0,0,0.05) !important;
}
:root[data-theme="light"] h1 {
    background: linear-gradient(135deg, #0284c7, #2563eb, #9333ea);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
:root[data-theme="light"] .tagline,
:root[data-theme="light"] .header-bar a {
    color: var(--accent-main);
}
:root[data-theme="light"] hr {
    border-top-color: #e2e8f0 !important;
}
:root[data-theme="light"] #theme-toggle {
    background: #ffffff;
    color: #334155;
    border-color: #cbd5e1;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
}
:root[data-theme="light"] #theme-toggle:hover {
    background: #f1f5f9;
    transform: translateY(-2px);
    box-shadow: 0 4px 10px rgba(0,0,0,0.1);
    border-color: #94a3b8;
    color: var(--accent-main);
}
:root[data-theme="light"] .toc-nav a {
    background: rgba(2, 132, 199, 0.1);
    color: var(--accent-main);
    border-color: rgba(2, 132, 199, 0.2);
}
:root[data-theme="light"] .toc-nav a:hover {
    background: var(--accent-main);
    color: #ffffff;
}
:root[data-theme="light"] .glass-card {
    background: #ffffff;
    border-color: #e2e8f0;
    box-shadow: 0 2px 8px rgba(0,0,0,0.02);
}
:root[data-theme="light"] .glass-card:hover {
    border-color: var(--accent-main);
    box-shadow: 0 10px 25px rgba(0,0,0,0.08);
}
:root[data-theme="light"] .glass-card h2 {
    color: var(--accent-main) !important;
    border-bottom-color: #e2e8f0;
}
:root[data-theme="light"] .glass-card h3 {
    color: #1e293b !important;
}
:root[data-theme="light"] .glass-card p,
:root[data-theme="light"] .glass-card li,
:root[data-theme="light"] .faq-a {
    color: #475569 !important;
}
:root[data-theme="light"] .highlight-text,
:root[data-theme="light"] .faq-q {
    color: var(--accent-main);
}
:root[data-theme="light"] .feature-box {
    background: rgba(2, 132, 199, 0.03);
    border-color: rgba(2, 132, 199, 0.1);
}
:root[data-theme="light"] .feature-box:hover {
    background: rgba(2, 132, 199, 0.06);
    box-shadow: 0 5px 20px rgba(2, 132, 199, 0.1);
}
:root[data-theme="light"] .feature-box h4 {
    color: #0f172a;
}
:root[data-theme="light"] code,
:root[data-theme="light"] kbd {
    background: rgba(2, 132, 199, 0.1);
    color: var(--accent-main);
    border-color: rgba(2, 132, 199, 0.2);
    box-shadow: none;
}
:root[data-theme="light"] .btn-outline {
    background: #f8fafc;
    border-color: #cbd5e1;
    color: #334155 !important;
}
:root[data-theme="light"] .btn-outline:hover {
    background: #f1f5f9;
    border-color: #94a3b8;
}
:root[data-theme="light"] .step-img-wrapper {
    background: #f8fafc;
    border-color: #e2e8f0;
}
:root[data-theme="light"] .step-img-wrapper img {
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
}
:root[data-theme="light"] .step-img-wrapper img:hover {
    box-shadow: 0 8px 25px rgba(2,132,199,0.2);
}
:root[data-theme="light"] .note-box {
    background: #f1f5f9;
    border-left-color: var(--accent-main);
}
:root[data-theme="light"] .note-box.danger {
    background: #fef2f2;
    border-left-color: var(--danger);
}
:root[data-theme="light"] .note-box p {
    color: #334155 !important;
}
:root[data-theme="light"] .custom-table {
    background: #ffffff;
    border: 1px solid #e2e8f0;
    color: #1e293b;
    box-shadow: none;
}
:root[data-theme="light"] .custom-table th {
    background-color: #f1f5f9;
    color: #0f172a;
    border-bottom: 1px solid #cbd5e1;
}
:root[data-theme="light"] .custom-table td {
    border-bottom: 1px solid #e2e8f0;
}
:root[data-theme="light"] .custom-table tr:hover td {
    background-color: #f8fafc;
}
:root[data-theme="light"] .faq-item {
    border-bottom-color: #e2e8f0;
}
:root[data-theme="light"] footer {
    color: #64748b;
}
:root[data-theme="light"] footer a {
    color: #0284c7;
}
:root[data-theme="light"] footer a:hover {
    color: #0369a1;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1024px) {
    .feature-grid,
    .feature-grid.cols-3 {
        grid-template-columns: 1fr;
    }
}
@media (max-width: 768px) {
    .btn-group-custom {
        flex-direction: column;
        width: 100%;
        gap: 10px;
    }
    .btn-main {
        width: 100%;
        justify-content: center;
        margin: 0 !important;
        box-sizing: border-box;
    }
    .custom-table {
        display: block;
        overflow-x: auto;
        white-space: nowrap;
    }
}

/* MathArt 等紫色主题可选覆盖示例（在页面 <style> 中按需使用）
:root {
    --accent-main: #a855f7;
    --accent-glow: rgba(168, 85, 247, 0.4);
}
:root[data-theme="light"] {
    --accent-main: #9333ea;
    --accent-glow: rgba(147, 51, 234, 0.2);
}
h1 {
    background: linear-gradient(135deg, #e879f9, #a855f7, #7e22ce);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}
*/