/* ============================================================
   SuanBox · 数字艺术创作 — 样式表
   现代极简风格 · CSS 变量驱动 · 响应式
   ============================================================ */

/* ----- 设计令牌 (Design Tokens) ----- */
:root {
    /* 配色 */
    --color-bg:         #fafafa;
    --color-bg-alt:     #f0f0f5;
    --color-surface:    #ffffff;
    --color-border:     #e5e5ec;
    --color-text:       #1a1a2e;
    --color-text-muted: #6b6b80;
    --color-text-soft:  #8e8ea0;

    --color-primary:    #6C5CE7;
    --color-primary-hv: #5a4bd1;
    --color-primary-bg: rgba(108,92,231,0.08);
    --color-accent:     #a29bfe;

    /* 排版 */
    --font-sans: "HarmonyOS Sans SC", "PingFang SC", "Microsoft YaHei",
                 "Noto Sans SC", -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: "JetBrains Mono", "SF Mono", "Cascadia Code", Consolas, monospace;

    --text-xs:   0.75rem;    /* 12px */
    --text-sm:   0.875rem;   /* 14px */
    --text-base: 1rem;       /* 16px */
    --text-lg:   1.125rem;   /* 18px */
    --text-xl:   1.25rem;    /* 20px */
    --text-2xl:  1.5rem;     /* 24px */
    --text-3xl:  2rem;       /* 32px */
    --text-4xl:  2.75rem;    /* 44px */
    --text-5xl:  3.5rem;     /* 56px */

    /* 间距 */
    --space-xs:  0.25rem;
    --space-sm:  0.5rem;
    --space-md:  1rem;
    --space-lg:  1.5rem;
    --space-xl:  2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.08);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.1);

    /* 布局 */
    --max-width: 1100px;
    --nav-height: 64px;

    /* 过渡 */
    --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
}

/* ----- 深色主题 ----- */
[data-theme="dark"] {
    --color-bg:         #0f0f1a;
    --color-bg-alt:     #16162a;
    --color-surface:    #1a1a30;
    --color-border:     #2a2a45;
    --color-text:       #e8e8f0;
    --color-text-muted: #9898b0;
    --color-text-soft:  #707088;

    --color-primary-bg: rgba(108,92,231,0.15);
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.2);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
    --shadow-lg: 0 8px 30px rgba(0,0,0,0.4);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.5);
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    font-size: var(--text-base);
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    transition: background var(--duration-normal) var(--ease-out),
                color var(--duration-normal) var(--ease-out);
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out);
}
a:hover { color: var(--color-primary-hv); }

img { max-width: 100%; display: block; }

/* ============================================================
   Container & Section
   ============================================================ */
.container {
    width: 100%;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
}

.section {
    padding: var(--space-4xl) 0;
}
.section-alt {
    background: var(--color-bg-alt);
}

.section-title {
    font-size: var(--text-3xl);
    font-weight: 700;
    letter-spacing: -0.02em;
    text-align: center;
    margin-bottom: var(--space-sm);
}
.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    text-align: center;
    margin-bottom: var(--space-3xl);
}
.section-more {
    text-align: center;
    margin-top: var(--space-2xl);
}

/* ============================================================
   Navigation
   ============================================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--nav-height);
    background: rgba(250,250,250,0.82);
    backdrop-filter: blur(16px) saturate(180%);
    -webkit-backdrop-filter: blur(16px) saturate(180%);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-out);
}
[data-theme="dark"] .nav {
    background: rgba(15,15,26,0.82);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 var(--space-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    font-size: var(--text-xl);
    font-weight: 700;
    color: var(--color-text) !important;
    letter-spacing: -0.02em;
}
.nav-logo:hover { color: var(--color-primary) !important; }

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--space-xs);
}

.nav-menu a {
    display: block;
    padding: var(--space-sm) var(--space-md);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text-muted);
    border-radius: var(--radius-sm);
    transition: all var(--duration-fast) var(--ease-out);
}
.nav-menu a:hover,
.nav-menu a.active {
    color: var(--color-primary);
    background: var(--color-primary-bg);
}

/* 移动端汉堡菜单 */
.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.nav-toggle span {
    display: block;
    width: 22px;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--duration-fast) var(--ease-out);
}

/* 主题切换 */
.theme-toggle {
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    width: 38px;
    height: 38px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    font-size: 1rem;
    transition: all var(--duration-fast) var(--ease-out);
    position: relative;
    overflow: hidden;
}
.theme-toggle:hover {
    background: var(--color-primary-bg);
    border-color: var(--color-primary);
}
.theme-icon-light,
.theme-icon-dark {
    position: absolute;
    transition: transform var(--duration-normal) var(--ease-out),
                opacity var(--duration-normal) var(--ease-out);
}
.theme-icon-light { opacity: 1; transform: translateY(0); }
.theme-icon-dark  { opacity: 0; transform: translateY(20px); }
[data-theme="dark"] .theme-icon-light { opacity: 0; transform: translateY(-20px); }
[data-theme="dark"] .theme-icon-dark  { opacity: 1; transform: translateY(0); }

/* ============================================================
   Hero
   ============================================================ */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: var(--nav-height) var(--space-xl) var(--space-4xl);
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 30%, rgba(108,92,231,0.06) 0%, transparent 70%),
        radial-gradient(ellipse 60% 50% at 80% 70%, rgba(162,155,254,0.05) 0%, transparent 70%);
    pointer-events: none;
}
[data-theme="dark"] .hero-bg {
    background:
        radial-gradient(ellipse 80% 60% at 50% 30%, rgba(108,92,231,0.12) 0%, transparent 70%),
        radial-gradient(ellipse 60% 50% at 80% 70%, rgba(162,155,254,0.08) 0%, transparent 70%);
}

.hero-content {
    position: relative;
    text-align: center;
    max-width: 700px;
}

.hero-tag {
    display: inline-block;
    font-size: var(--text-xs);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--color-primary);
    background: var(--color-primary-bg);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
}

.hero-title {
    margin-bottom: var(--space-lg);
}
.hero-title-main {
    display: block;
    font-size: var(--text-5xl);
    font-weight: 800;
    letter-spacing: -0.03em;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.1;
}
.hero-title-sub {
    display: block;
    font-size: var(--text-xl);
    font-weight: 400;
    color: var(--color-text-muted);
    margin-top: var(--space-md);
    line-height: 1.6;
}

.hero-desc {
    font-size: var(--text-lg);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-2xl);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: var(--space-2xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-xs);
    color: var(--color-text-soft);
    animation: bounce 2s ease-in-out infinite;
}
.hero-scroll-icon { font-size: 1.2rem; }

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50%      { transform: translateX(-50%) translateY(8px); }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 0.7em 1.6em;
    font-size: var(--text-sm);
    font-weight: 600;
    font-family: var(--font-sans);
    border-radius: var(--radius-full);
    border: 1.5px solid transparent;
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
    white-space: nowrap;
    line-height: 1.4;
}

.btn-primary {
    background: var(--color-primary);
    color: #fff !important;
    border-color: var(--color-primary);
}
.btn-primary:hover {
    background: var(--color-primary-hv);
    border-color: var(--color-primary-hv);
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(108,92,231,0.35);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary) !important;
    border-color: var(--color-primary);
}
.btn-outline:hover {
    background: var(--color-primary-bg);
    transform: translateY(-1px);
}

/* ============================================================
   Filter Bar
   ============================================================ */
.filter-bar {
    display: flex;
    gap: var(--space-sm);
    justify-content: center;
    margin-bottom: var(--space-3xl);
    flex-wrap: wrap;
}
.filter-btn {
    padding: 0.45em 1.2em;
    font-size: var(--text-sm);
    font-weight: 500;
    font-family: var(--font-sans);
    background: transparent;
    color: var(--color-text-muted);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--duration-fast) var(--ease-out);
}
.filter-btn:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
}
.filter-btn.active {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
}

/* ============================================================
   Gallery (作品)
   ============================================================ */
.gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-xl);
}

.gallery-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-out);
    cursor: pointer;
}
.gallery-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.gallery-card-image {
    aspect-ratio: 4/3;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--color-text-soft);
    overflow: hidden;
}
.gallery-card-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--duration-slow) var(--ease-out);
}
.gallery-card:hover .gallery-card-image img {
    transform: scale(1.04);
}

.gallery-card-body {
    padding: var(--space-lg);
}
.gallery-card-title {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}
.gallery-card-tag {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    display: flex;
    gap: var(--space-sm);
}
.gallery-card-tag span {
    padding: 0.15em 0.6em;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-weight: 500;
}

/* 占位卡片 */
.gallery-card-placeholder .gallery-card-image {
    background: linear-gradient(135deg, var(--color-bg-alt), var(--color-surface));
}

/* ============================================================
   Video Grid
   ============================================================ */
.video-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: var(--space-xl);
}

.video-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-out);
}
.video-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}
.video-card-thumb {
    aspect-ratio: 16/9;
    background: var(--color-bg-alt);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}
.video-card-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video-play-icon {
    position: absolute;
    width: 50px;
    height: 50px;
    background: rgba(0,0,0,0.55);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 1.2rem;
    transition: all var(--duration-fast) var(--ease-out);
}
.video-card:hover .video-play-icon {
    background: var(--color-primary);
    transform: scale(1.1);
}

.video-card-body {
    padding: var(--space-lg);
}
.video-card-title {
    font-size: var(--text-base);
    font-weight: 600;
    margin-bottom: var(--space-xs);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.video-card-meta {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
}

/* ============================================================
   Article List
   ============================================================ */
.article-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.article-item {
    display: flex;
    gap: var(--space-xl);
    padding: var(--space-xl);
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border);
    transition: all var(--duration-normal) var(--ease-out);
    cursor: pointer;
    align-items: center;
}
.article-item:hover {
    transform: translateX(4px);
    box-shadow: var(--shadow-md);
    border-color: var(--color-primary);
}

.article-date {
    font-size: var(--text-xs);
    color: var(--color-text-muted);
    font-family: var(--font-mono);
    white-space: nowrap;
    min-width: 90px;
}
.article-content {
    flex: 1;
    min-width: 0;
}
.article-title {
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--space-xs);
}
.article-excerpt {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}
.article-tag {
    display: inline-block;
    font-size: var(--text-xs);
    padding: 0.15em 0.6em;
    background: var(--color-primary-bg);
    color: var(--color-primary);
    border-radius: var(--radius-full);
    font-weight: 500;
    margin-top: var(--space-sm);
}

/* ============================================================
   Software Showcase
   ============================================================ */
.software-showcase {
    max-width: 800px;
    margin: 0 auto;
}
.software-hero {
    display: flex;
    gap: var(--space-3xl);
    align-items: flex-start;
    background: var(--color-surface);
    padding: var(--space-3xl);
    border-radius: var(--radius-xl);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}
.software-icon {
    flex-shrink: 0;
    width: 90px;
    height: 90px;
}
.software-icon svg { width: 100%; height: 100%; }

.software-info h3 {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--space-xs);
}
.software-ver {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    margin-bottom: var(--space-lg);
}
.software-desc {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-xl);
}

.software-features {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: var(--space-sm);
    margin-bottom: var(--space-xl);
}
.feature-item {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: var(--text-sm);
    color: var(--color-text);
    padding: var(--space-sm) var(--space-md);
    background: var(--color-bg);
    border-radius: var(--radius-sm);
}
.feature-icon { font-size: 1.1rem; }

.software-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

/* ============================================================
   Timeline (更新日志)
   ============================================================ */
.timeline {
    position: relative;
    max-width: 650px;
    margin: 0 auto;
    padding-left: var(--space-2xl);
}
.timeline::before {
    content: '';
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--color-border);
}

.timeline-item {
    position: relative;
    padding-bottom: var(--space-2xl);
}
.timeline-item:last-child { padding-bottom: 0; }

.timeline-dot {
    position: absolute;
    left: calc(-1 * var(--space-2xl) + 3px);
    top: 0.3em;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: var(--color-primary);
    border: 2px solid var(--color-bg);
    box-shadow: 0 0 0 3px var(--color-primary-bg);
}

.timeline-version {
    font-size: var(--text-sm);
    font-weight: 700;
    color: var(--color-primary);
    font-family: var(--font-mono);
    margin-bottom: var(--space-xs);
}
.timeline-date {
    font-size: var(--text-xs);
    color: var(--color-text-soft);
    margin-left: var(--space-sm);
    font-weight: 400;
}
.timeline-body {
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    line-height: 1.7;
}
.timeline-body ul {
    list-style: none;
    padding: 0;
}
.timeline-body li::before {
    content: '·';
    color: var(--color-primary);
    font-weight: 700;
    margin-right: var(--space-sm);
}

/* ============================================================
   About
   ============================================================ */
.about-grid {
    display: flex;
    gap: var(--space-3xl);
    align-items: center;
    max-width: 750px;
    margin: 0 auto;
}
.about-avatar {
    flex-shrink: 0;
}
.avatar-placeholder {
    width: 140px;
    height: 140px;
    border-radius: 50%;
    background: var(--color-bg-alt);
    border: 2px solid var(--color-border);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}
.avatar-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.about-text h3 {
    font-size: var(--text-xl);
    font-weight: 600;
    margin-bottom: var(--space-md);
}
.about-text p {
    font-size: var(--text-base);
    color: var(--color-text-muted);
    line-height: 1.8;
    margin-bottom: var(--space-md);
}

.social-links {
    display: flex;
    gap: var(--space-md);
    margin-top: var(--space-xl);
}
.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    font-size: var(--text-sm);
    color: var(--color-text-muted) !important;
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border);
    transition: all var(--duration-fast) var(--ease-out);
}
.social-link:hover {
    color: var(--color-primary) !important;
    border-color: var(--color-primary);
    background: var(--color-primary-bg);
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-2xl) 0;
}
.footer-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--text-sm);
    color: var(--color-text-muted);
    flex-wrap: wrap;
    gap: var(--space-sm);
}
.footer-copy { margin: 0; }
.footer-built { margin: 0; }

/* ============================================================
   Animations
   ============================================================ */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--duration-slow) var(--ease-out),
                transform var(--duration-slow) var(--ease-out);
}
.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --text-5xl: 2.5rem;
        --text-4xl: 2rem;
        --text-3xl: 1.75rem;
        --text-2xl: 1.3rem;
        --space-4xl: 3rem;
        --space-3xl: 2.5rem;
    }

    .container { padding: 0 var(--space-lg); }

    /* 移动端导航 */
    .nav-toggle { display: flex; z-index: 101; }
    .nav-menu {
        position: fixed;
        inset: 0;
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: var(--space-lg);
        background: var(--color-bg);
        opacity: 0;
        pointer-events: none;
        transition: opacity var(--duration-normal) var(--ease-out);
    }
    .nav-menu.open {
        opacity: 1;
        pointer-events: auto;
    }
    .nav-menu a { font-size: var(--text-xl); }

    /* Hero */
    .hero-title-sub { font-size: var(--text-base); }
    .hero-desc { font-size: var(--text-base); }
    .hero-scroll { display: none; }

    /* Gallery */
    .gallery { grid-template-columns: 1fr; }
    .video-grid { grid-template-columns: 1fr; }

    /* Article */
    .article-item { flex-direction: column; gap: var(--space-sm); padding: var(--space-lg); }

    /* Software */
    .software-hero { flex-direction: column; align-items: center; text-align: center; padding: var(--space-xl); }
    .software-features { grid-template-columns: 1fr 1fr; }
    .software-actions { justify-content: center; }

    /* About */
    .about-grid { flex-direction: column; text-align: center; }
    .social-links { justify-content: center; flex-wrap: wrap; }

    /* Footer */
    .footer-inner { flex-direction: column; text-align: center; }

    /* Timeline */
    .timeline { padding-left: var(--space-xl); }
}