/* ============================================================
   ere · 个人品牌样式
   设计系统：与 ZeroPass 保持一致
   Header 固定顶部 · Footer 固定底部
   ============================================================ */

/* ===== 基础变量 ===== */
:root {
    --primary: #4A6CF7;
    --primary-dark: #3A56D4;
    --primary-light: #6B8AFF;
    --primary-bg: #EEF2FF;
    --bg: #F8FAFC;
    --bg-alt: #F1F4F8;
    --card: #FFFFFF;
    --text: #0F172A;
    --text-secondary: #475569;
    --text-light: #94A3B8;
    --border: #E2E8F0;
    --shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
    --shadow-hover: 0 12px 40px rgba(74, 108, 247, 0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-full: 9999px;
    --container: 960px;
    --header-h: 64px;
    --footer-h: 72px;
    --transition: 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 重置 ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    font-size: 16px;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    /* 预留 header 和 footer 空间 */
    padding-top: var(--header-h);
    padding-bottom: var(--footer-h);
    min-height: 100vh;
}

a {
    text-decoration: none;
    color: inherit;
}

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

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================================
   HEADER · 固定顶部
   ============================================================ */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    height: var(--header-h);
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.header-scrolled {
    border-color: var(--border);
    box-shadow: 0 1px 12px rgba(0, 0, 0, 0.04);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* 品牌 */
.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 18px;
    color: var(--text);
    flex-shrink: 0;
}

.brand-icon {
    width: 32px;
    height: 32px;
    border-radius: 8px;
}

.brand-name {
    letter-spacing: -0.3px;
}

.brand-dot {
    color: var(--primary);
    margin: 0 2px;
    font-weight: 300;
}

/* 导航 */
.nav-list {
    display: flex;
    align-items: center;
    gap: 8px;
    list-style: none;
}

.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 6px 16px;
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.nav-link:hover,
.nav-link:focus {
    background: var(--primary-bg);
    color: var(--primary);
}

.nav-link i {
    font-size: 16px;
}

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    border-radius: 8px;
    transition: background var(--transition);
}

.hamburger:hover {
    background: var(--primary-bg);
}

.hamburger-line {
    display: block;
    width: 22px;
    height: 2.5px;
    background: var(--text);
    border-radius: 4px;
    transition: all var(--transition);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
    transform: translateY(7.5px) rotate(45deg);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
    transform: translateY(-7.5px) rotate(-45deg);
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
    padding: 60px 0 56px;
    background: linear-gradient(180deg, var(--primary-bg) 0%, var(--bg) 100%);
    min-height: 50vh;
    display: flex;
    align-items: center;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 48px;
    align-items: center;
}

.hero-content {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.hero-greeting {
    font-size: 16px;
    color: var(--text-secondary);
    font-weight: 500;
}

.hero-title {
    font-size: 52px;
    font-weight: 800;
    letter-spacing: -1.5px;
    color: var(--text);
    line-height: 1.1;
}

.hero-title::after {
    content: "";
    display: inline-block;
    width: 8px;
    height: 8px;
    background: var(--primary);
    border-radius: 50%;
    margin-left: 4px;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%,
    100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.4;
        transform: scale(0.7);
    }
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 400px;
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin-top: 4px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 24px;
    border-radius: var(--radius-full);
    font-size: 15px;
    font-weight: 600;
    border: none;
    cursor: pointer;
    transition: all var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: #fff;
    box-shadow: 0 4px 16px rgba(74, 108, 247, 0.3);
}

.btn-primary:hover {
    background: var(--primary-dark);
    box-shadow: 0 6px 24px rgba(74, 108, 247, 0.4);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--text-secondary);
    border: 1.5px solid var(--border);
}

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

.hero-social {
    display: flex;
    gap: 12px;
    margin-top: 4px;
}

.hero-social a {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--card);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
    transition: all var(--transition);
}

.hero-social a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
    transform: translateY(-2px);
}

.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-orb {
    width: 280px;
    height: 280px;
    border-radius: 50%;
    background: radial-gradient(circle at 30% 30%, var(--primary-light), var(--primary));
    opacity: 0.15;
    filter: blur(60px);
    animation: orb-float 8s ease-in-out infinite alternate;
}

@keyframes orb-float {
    0% {
        transform: translateY(0) scale(1);
    }
    100% {
        transform: translateY(-20px) scale(1.05);
    }
}

/* ============================================================
   SECTION · 通用
   ============================================================ */
.section {
    padding: 56px 0;
}

.section--alt {
    background: var(--bg-alt);
}

.section-header {
    text-align: center;
    margin-bottom: 32px;
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    letter-spacing: -0.5px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.section-title i {
    color: var(--primary);
    font-size: 26px;
}

.section-sub {
    color: var(--text-secondary);
    font-size: 16px;
    margin-top: 4px;
}

.section-more {
    text-align: center;
    margin-top: 28px;
}

/* ============================================================
   TOOLS
   ============================================================ */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 20px;
}

.tool-card {
    display: flex;
    align-items: stretch;
    gap: 16px;
    padding: 20px 20px 20px 18px;
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    cursor: pointer;
    position: relative;
}

.tool-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.tool-card:active {
    transform: scale(0.98);
}

.tool-card--featured {
    border-color: var(--primary);
    background: linear-gradient(135deg, var(--card) 0%, var(--primary-bg) 100%);
}

.tool-icon {
    width: 48px;
    height: 48px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    flex-shrink: 0;
}

.tool-content {
    flex: 1;
    min-width: 0;
}

.tool-header {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}

.tool-name {
    font-size: 17px;
    font-weight: 700;
}

.tool-badge {
    font-size: 11px;
    font-weight: 600;
    padding: 1px 10px;
    border-radius: var(--radius-full);
    background: var(--primary);
    color: #fff;
    letter-spacing: 0.3px;
}

.tool-badge--mini {
    background: var(--bg-alt);
    color: var(--text-secondary);
}

.tool-desc {
    font-size: 14px;
    color: var(--text-secondary);
    margin-top: 2px;
}

.tool-meta {
    display: flex;
    gap: 12px;
    margin-top: 6px;
    font-size: 13px;
    color: var(--text-light);
    flex-wrap: wrap;
}

.tool-meta span {
    display: flex;
    align-items: center;
    gap: 3px;
}

.tool-meta i {
    font-size: 14px;
    color: var(--primary);
}

.tool-arrow {
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-light);
    font-size: 20px;
    transition: all var(--transition);
}

.tool-card:hover .tool-arrow {
    transform: translateY(-50%) translateX(4px);
    color: var(--primary);
}

.tool-card--coming {
    opacity: 0.6;
    pointer-events: none;
}

/* ============================================================
   ARTICLES (欢迎页上的最新文章)
   ============================================================ */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.article-card {
    background: var(--card);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    box-shadow: var(--shadow);
    transition: all var(--transition);
    overflow: hidden;
}

.article-card:hover {
    border-color: var(--primary);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.article-link {
    display: block;
    padding: 20px 22px 18px;
}

.article-meta {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 13px;
    color: var(--text-light);
    margin-bottom: 8px;
}

.article-date {
    font-weight: 500;
}

.article-tag {
    font-size: 11px;
    font-weight: 600;
    padding: 2px 10px;
    border-radius: var(--radius-full);
    background: var(--primary-bg);
    color: var(--primary);
    letter-spacing: 0.3px;
}

.article-title {
    font-size: 18px;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 6px;
    color: var(--text);
    transition: color var(--transition);
}

.article-card:hover .article-title {
    color: var(--primary);
}

.article-excerpt {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.6;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.article-footer {
    margin-top: 12px;
}

.article-read {
    font-size: 14px;
    font-weight: 600;
    color: var(--primary);
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: gap var(--transition);
}

.article-read i {
    font-size: 16px;
}

.article-link:hover .article-read {
    gap: 8px;
}

/* ============================================================
   ABOUT
   ============================================================ */
.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 40px;
    align-items: start;
}

.about-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 12px;
}

.about-desc strong {
    color: var(--text);
}

.about-links {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
    margin-top: 16px;
}

.about-links a {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    font-weight: 500;
    color: var(--primary);
    transition: color var(--transition);
}

.about-links a:hover {
    color: var(--primary-dark);
}

.about-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
    background: var(--card);
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--border);
    text-align: center;
}

.stat-item {
    display: flex;
    flex-direction: column;
}

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--text);
    line-height: 1.2;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ============================================================
   FOOTER · 固定底部
   ============================================================ */
.site-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 90;
    padding: 14px 0;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-top: 1px solid var(--border);
}

.footer-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 14px;
    color: var(--text-secondary);
}

.footer-name {
    font-weight: 600;
    color: var(--text);
}

.footer-copy {
    font-size: 13px;
    color: var(--text-light);
}

.footer-links {
    display: flex;
    gap: 12px;
}

.footer-links a {
    width: 36px;
    height: 36px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-secondary);
    transition: all var(--transition);
    background: var(--bg);
}

.footer-links a:hover {
    background: var(--primary);
    color: #fff;
}

.footer-credit {
    font-size: 13px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 4px;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
    :root {
        --footer-h: 80px;
    }

    body {
        padding-bottom: var(--footer-h);
    }

    .hero-inner {
        grid-template-columns: 1fr;
        gap: 24px;
        text-align: center;
    }

    .hero-content {
        align-items: center;
    }

    .hero-desc {
        max-width: 100%;
    }

    .hero-title {
        font-size: 36px;
    }

    .hero-orb {
        width: 200px;
        height: 200px;
    }

    .hero-visual {
        display: none;
    }

    .about-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .about-stats {
        grid-template-columns: repeat(3, 1fr);
        padding: 20px;
    }

    .tools-grid {
        grid-template-columns: 1fr;
    }

    .articles-grid {
        grid-template-columns: 1fr;
    }

    .tool-arrow {
        display: none;
    }

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

    .site-footer {
        padding: 12px 0;
    }

    /* 导航移动端 */
    .nav {
        position: fixed;
        top: var(--header-h);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        -webkit-backdrop-filter: blur(12px);
        padding: 16px 24px 24px;
        border-bottom: 1px solid var(--border);
        transform: translateY(-120%);
        opacity: 0;
        transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        pointer-events: none;
    }

    .nav.nav-open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: auto;
    }

    .nav-list {
        flex-direction: column;
        gap: 4px;
        align-items: stretch;
    }

    .nav-link {
        padding: 10px 16px;
        justify-content: center;
        border-radius: var(--radius-sm);
    }

    .hamburger {
        display: flex;
    }
}

@media (max-width: 480px) {
    :root {
        --footer-h: 88px;
    }

    body {
        padding-bottom: var(--footer-h);
    }

    .container {
        padding: 0 16px;
    }

    .hero {
        padding: 40px 0 32px;
        min-height: 40vh;
    }

    .section {
        padding: 40px 0;
    }

    .hero-title {
        font-size: 30px;
    }

    .hero-actions .btn {
        padding: 8px 18px;
        font-size: 14px;
    }

    .section-title {
        font-size: 22px;
    }

    .stat-number {
        font-size: 26px;
    }

    .site-footer {
        padding: 10px 0;
    }
}

/* ===== 工具提示与无障碍 ===== */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}