/* ============================================================
   HamKit · DeepSeek 风格设计系统
   深色画布 · 大气蓝渐变 · 居中布局 · 鸿蒙字体
   ============================================================ */

:root {
    /* 颜色：午夜深空 + 大气蓝 */
    --bg-base: #0B0E14;
    --bg-elevated: #11151D;
    --bg-card: rgba(22, 27, 34, 0.6);
    --bg-card-hover: rgba(30, 36, 46, 0.8);

    --text-primary: #E6EDF3;
    --text-secondary: #B1BAC4;
    --text-tertiary: #7D8590;
    --text-muted: #4A5159;

    --border: rgba(255, 255, 255, 0.06);
    --border-strong: rgba(255, 255, 255, 0.12);

    /* 强调色 */
    --accent: #4D8FFF;
    --accent-bright: #6BA3FF;
    --accent-glow: rgba(77, 143, 255, 0.4);
    --accent-soft: rgba(77, 143, 255, 0.12);

    --cyan: #5AC8C8;
    --green: #3FB950;

    /* 字体：鸿蒙优先 */
    --font-sans: 'HarmonyOS Sans SC', 'HarmonyOS Sans', 'PingFang SC',
                 'Microsoft YaHei', system-ui, sans-serif;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    /* 容器 */
    --container: 1200px;
}

/* ---------- 浅色模式覆盖（系统未启用深色时） ---------- */
@media (prefers-color-scheme: light) {
    :root {
        --bg-base: #F7F8FA;
        --bg-elevated: #FFFFFF;
        --bg-card: rgba(255, 255, 255, 0.72);
        --bg-card-hover: rgba(255, 255, 255, 0.95);

        --text-primary: #1F2328;
        --text-secondary: #424A53;
        --text-tertiary: #636C76;
        --text-muted: #848D97;

        --border: rgba(0, 0, 0, 0.08);
        --border-strong: rgba(0, 0, 0, 0.14);

        --accent: #2D6BFF;
        --accent-bright: #1A56E0;
        --accent-glow: rgba(45, 107, 255, 0.22);
        --accent-soft: rgba(45, 107, 255, 0.08);
    }
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    background: var(--bg-base);
    color: var(--text-primary);
    font-family: var(--font-sans);
    font-size: 15px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    overflow-x: hidden;
}
img { display: block; max-width: 100%; }
a {
    color: inherit;
    text-decoration: none;
    transition: color 0.2s;
}
ul { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; }

/* ---------- 背景光晕 ---------- */
.aurora {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}
.aurora__blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(120px);
    opacity: 0.4;
    animation: drift 18s ease-in-out infinite;
}
@media (prefers-color-scheme: light) {
    .aurora__blob { opacity: 0.25; }
}
.aurora__blob--1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, #4D8FFF 0%, transparent 70%);
    top: -200px;
    left: -100px;
}
.aurora__blob--2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, #5AC8C8 0%, transparent 70%);
    top: 30%;
    right: -150px;
    animation-delay: -6s;
}
.aurora__blob--3 {
    width: 450px;
    height: 450px;
    background: radial-gradient(circle, #6B5DD3 0%, transparent 70%);
    bottom: -100px;
    left: 30%;
    animation-delay: -12s;
}
@keyframes drift {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33%      { transform: translate(40px, -30px) scale(1.05); }
    66%      { transform: translate(-30px, 40px) scale(0.95); }
}
.aurora__grid {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 80%);
}
@media (prefers-color-scheme: light) {
    .aurora__grid {
        background-image:
            linear-gradient(rgba(0,0,0,0.03) 1px, transparent 1px),
            linear-gradient(90deg, rgba(0,0,0,0.03) 1px, transparent 1px);
    }
}

/* ---------- 导航 ---------- */
.nav {
    position: relative;
    z-index: 10;
    max-width: var(--container);
    margin: 0 auto;
    padding: 20px 32px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 32px;
}
.nav__brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}
.nav__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}
.nav__links {
    display: flex;
    gap: 32px;
    font-size: 14px;
    color: var(--text-secondary);
}
.nav__links a:hover { color: var(--text-primary); }
.nav__cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 36px;
    padding: 0 16px;
    border: 1px solid var(--border-strong);
    border-radius: var(--radius-sm);
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.2s;
}
.nav__cta:hover {
    border-color: var(--accent);
    color: var(--text-primary);
    background: var(--accent-soft);
}

/* ---------- 主容器 ---------- */
main {
    position: relative;
    z-index: 1;
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 32px;
}

/* ---------- Hero ---------- */
.hero {
    padding: 100px 0 120px;
    text-align: center;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 24px;
}
.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 14px;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    font-size: 12px;
    color: var(--text-secondary);
}
.hero__badge-dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--green);
    box-shadow: 0 0 8px var(--green);
    animation: pulse-dot 2s ease-in-out infinite;
}
@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50%      { opacity: 0.4; }
}
.hero__title {
    font-size: clamp(48px, 7vw, 88px);
    font-weight: 600;
    line-height: 1.05;
    letter-spacing: -0.04em;
    background: linear-gradient(180deg, #FFFFFF 0%, #B1BAC4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-top: 8px;
}
.hero__subtitle {
    font-size: clamp(20px, 2.5vw, 28px);
    color: var(--text-primary);
    font-weight: 400;
    line-height: 1.4;
}
.hero__desc {
    font-size: 16px;
    color: var(--text-tertiary);
    line-height: 1.7;
    max-width: 580px;
}
.hero__cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 8px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    height: 44px;
    padding: 0 24px;
    font-family: var(--font-sans);
    font-size: 15px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    border: 1px solid transparent;
    transition: all 0.2s;
    cursor: pointer;
}
.btn--primary {
    background: var(--accent);
    color: #FFFFFF;
    box-shadow: 0 8px 24px -8px var(--accent-glow);
}
.btn--primary:hover {
    background: var(--accent-bright);
    transform: translateY(-1px);
    box-shadow: 0 12px 32px -8px var(--accent-glow);
}
.btn--ghost {
    background: var(--bg-card);
    color: var(--text-primary);
    border-color: var(--border-strong);
    backdrop-filter: blur(20px);
}
.btn--ghost:hover {
    background: var(--bg-card-hover);
    border-color: var(--border-strong);
}

/* ---------- 通用 section ---------- */
.section {
    padding: 96px 0;
}
.section__head {
    text-align: center;
    margin-bottom: 64px;
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}
.section__tag {
    display: inline-block;
    padding: 4px 12px;
    border: 1px solid var(--border-strong);
    border-radius: 100px;
    font-size: 11px;
    color: var(--accent-bright);
    letter-spacing: 0.1em;
    background: var(--accent-soft);
}
.section__title {
    font-size: clamp(32px, 4vw, 48px);
    font-weight: 600;
    line-height: 1.15;
    background: linear-gradient(180deg, #FFFFFF 0%, #B1BAC4 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}
@media (prefers-color-scheme: light) {
    .hero__title,
    .section__title {
        background: linear-gradient(180deg, #1F2328 0%, #424A53 100%);
        -webkit-background-clip: text;
        background-clip: text;
        -webkit-text-fill-color: transparent;
    }
}
.section__desc {
    font-size: 15px;
    color: var(--text-tertiary);
    line-height: 1.7;
}

/* ---------- 功能卡片 ---------- */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}
.feature {
    padding: 32px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    flex-direction: column;
    gap: 16px;
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
}
.feature::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
    opacity: 0;
    transition: opacity 0.3s;
}
.feature:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
    transform: translateY(-4px);
}
.feature:hover::before { opacity: 1; }
.feature--wide { grid-column: span 3; }
.feature__icon {
    width: 44px;
    height: 44px;
    border-radius: var(--radius-sm);
    background: var(--accent-soft);
    color: var(--accent-bright);
    display: flex;
    align-items: center;
    justify-content: center;
}
.feature__title {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
}
.feature__badge {
    flex-shrink: 0;
    padding: 2px 8px;
    border: 1px solid rgba(232, 179, 76, 0.4);
    border-radius: 100px;
    font-size: 11px;
    font-weight: 500;
    letter-spacing: 0;
    color: #E8B34C;
    background: rgba(232, 179, 76, 0.12);
}
@media (prefers-color-scheme: light) {
    .feature__badge {
        color: #B7791F;
        border-color: rgba(183, 121, 31, 0.4);
        background: rgba(183, 121, 31, 0.1);
    }
}
.feature__text {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.7;
    flex: 1;
}
.feature__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}
.feature__tags span {
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 11px;
    color: var(--text-tertiary);
    background: rgba(255,255,255,0.02);
}

/* ---------- 应用预览 notes ---------- */
.notes {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.note {
    padding: 28px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    gap: 16px;
    transition: all 0.3s;
}
.note:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
}
.note__icon {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    border-radius: var(--radius-sm);
    background: var(--accent-soft);
    color: var(--accent-bright);
    display: flex;
    align-items: center;
    justify-content: center;
}
.note__title {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 6px;
}
.note__text {
    font-size: 13.5px;
    color: var(--text-secondary);
    line-height: 1.65;
    margin: 0;
}

/* ---------- 技术栈 ---------- */
.stack {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}
.stack__group {
    padding: 24px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    transition: all 0.3s;
}
.stack__group:hover {
    border-color: var(--border-strong);
    background: var(--bg-card-hover);
}
.stack__title {
    font-size: 13px;
    color: var(--accent-bright);
    margin-bottom: 16px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}
.stack__list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.stack__list li {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    gap: 12px;
    font-size: 13.5px;
}
.stack__name {
    color: var(--text-primary);
}
.stack__ver {
    color: var(--text-tertiary);
    font-size: 12px;
}

/* ---------- 开发者 ---------- */
.devs {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
    max-width: 800px;
    margin: 0 auto;
}
.dev-card {
    padding: 28px;
    background: var(--bg-card);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s;
}
.dev-card:hover {
    border-color: var(--accent);
    background: var(--bg-card-hover);
    transform: translateY(-2px);
}
.dev__avatar {
    width: 64px;
    height: 64px;
    flex-shrink: 0;
    border-radius: var(--radius-md);
    overflow: hidden;
    border: 1px solid var(--border-strong);
}
.dev__avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.dev-card__body {
    display: flex;
    flex-direction: column;
    gap: 8px;
    min-width: 0;
}
.dev__name {
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}
.dev-card__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 16px;
    font-size: 13px;
}
.dev__link {
    color: var(--text-tertiary);
    padding: 4px 10px;
    border: 1px solid var(--border);
    border-radius: 100px;
    transition: all 0.2s;
}
.dev__link:hover {
    color: var(--accent-bright);
    border-color: var(--accent);
    background: var(--accent-soft);
}

/* ---------- 页脚 ---------- */
.footer {
    position: relative;
    z-index: 1;
    max-width: var(--container);
    margin: 0 auto;
    padding: 80px 32px 32px;
    border-top: 1px solid var(--border);
    margin-top: 64px;
}
.footer__top {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 64px;
    padding-bottom: 48px;
    border-bottom: 1px solid var(--border);
}
.footer__brand { display: flex; flex-direction: column; gap: 12px; }
.footer__logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 18px;
    font-weight: 600;
    color: var(--text-primary);
}
.footer__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--accent);
    box-shadow: 0 0 12px var(--accent-glow);
}
.footer__tagline {
    font-size: 13px;
    color: var(--text-tertiary);
    line-height: 1.6;
    max-width: 320px;
}
.footer__cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
}
.footer__col { display: flex; flex-direction: column; gap: 12px; }
.footer__col h4 {
    font-size: 12px;
    color: var(--accent-bright);
    letter-spacing: 0.1em;
    margin-bottom: 4px;
}
.footer__col a, .footer__col span {
    font-size: 13px;
    color: var(--text-secondary);
}
.footer__col a:hover { color: var(--text-primary); }
.footer__bar {
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    font-size: 12px;
    color: var(--text-muted);
}
.footer__sig { color: var(--accent-bright); }

/* ---------- 滚动揭示 ---------- */
[data-reveal] {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].is-visible {
    opacity: 1;
    transform: translateY(0);
}

/* ---------- 响应式 ---------- */
@media (max-width: 1024px) {
    .features { grid-template-columns: repeat(2, 1fr); }
    .feature--wide { grid-column: span 2; }
    .notes { grid-template-columns: 1fr; }
    .stack { grid-template-columns: repeat(2, 1fr); }
    .devs { grid-template-columns: 1fr; }
    .footer__top { grid-template-columns: 1fr; gap: 32px; }
}
@media (max-width: 640px) {
    .nav { padding: 16px 20px; gap: 16px; flex-wrap: wrap; }
    .nav__links { gap: 16px; font-size: 13px; }
    .nav__cta { display: none; }
    main { padding: 0 20px; }
    .hero { padding: 64px 0 80px; }
    .section { padding: 64px 0; }
    .features { grid-template-columns: 1fr; }
    .feature--wide { grid-column: span 1; }
    .stack { grid-template-columns: 1fr; }
    .footer { padding: 48px 20px 24px; }
    .footer__top { grid-template-columns: 1fr; }
    .footer__cols { grid-template-columns: 1fr; gap: 24px; }
    .footer__bar { flex-direction: column; gap: 8px; }
    .dev-card { flex-direction: column; align-items: flex-start; }
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    [data-reveal] { opacity: 1; transform: none; }
}