/* ============================================`r`n   IP总网 - Main Stylesheet
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-primary: #3d79e5;
    --color-primary-dark: #2f63c0;
    --color-primary-light: #eaf1fe;
    --color-accent: #0c8a86;
    --color-bg: #f8fafc;
    --color-surface: #ffffff;
    --color-text: #1e293b;
    --color-text-secondary: #64748b;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --radius-sm: 6px;
    --radius: 12px;
    --radius-lg: 20px;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
    --shadow: 0 4px 6px -1px rgba(0,0,0,.07), 0 2px 4px -2px rgba(0,0,0,.05);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,.1), 0 8px 10px -6px rgba(0,0,0,.05);
    --shadow-xl: 0 20px 50px -12px rgba(0,0,0,.15);
    --transition: 0.2s ease;
    --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Helvetica, Arial, sans-serif;
    --max-width: 1200px;
    --header-height: 68px;
}

/* Dark Mode */
[data-theme="dark"] {
    --color-primary: #6b94f5;
    --color-primary-dark: #507aeb;
    --color-primary-light: #172240;
    --color-accent: #26c4b4;
    --color-bg: #0f172a;
    --color-surface: #1e293b;
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-border: #334155;
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
    --shadow: 0 4px 6px -1px rgba(0,0,0,.4), 0 2px 4px -2px rgba(0,0,0,.3);
    --shadow-lg: 0 10px 25px -5px rgba(0,0,0,.5), 0 8px 10px -6px rgba(0,0,0,.3);
    --shadow-xl: 0 20px 50px -12px rgba(0,0,0,.6);
}

[data-theme="dark"] .header { background: rgba(15,23,42,.92); border-bottom-color: var(--color-border); }
[data-theme="dark"] .hero { background: linear-gradient(180deg, #172240 0%, var(--color-bg) 100%); }
[data-theme="dark"] .hero-glow { background: radial-gradient(circle, rgba(107,148,245,.35) 0%, rgba(107,148,245,.15) 35%, transparent 70%); }
[data-theme="dark"] .hero-search-input { background: var(--color-surface); color: var(--color-text); }
[data-theme="dark"] .hero-search-input::placeholder { color: var(--color-text-secondary); }
[data-theme="dark"] .hero-card { background: var(--color-surface); }
[data-theme="dark"] .footer { background: #020617; }
[data-theme="dark"] .footer-bottom { border-top-color: rgba(148,163,184,.08); }
[data-theme="dark"] .categories, [data-theme="dark"] .features { background: var(--color-bg); }
[data-theme="dark"] .toast { background: #334155; color: #f1f5f9; }
[data-theme="dark"] .toast kbd { background: rgba(0,0,0,.3); }
[data-theme="dark"] .faq-item[open] { border-color: var(--color-primary); }
[data-theme="dark"] .filter-tag { background: var(--color-surface); }
[data-theme="dark"] .platform-features span { background: rgba(255,255,255,.05); }
[data-theme="dark"] .platform-type-tag { background: rgba(251,191,36,.15); color: #fbbf24; }
[data-theme="dark"] .article-thumb { background: var(--color-border); }
[data-theme="dark"] .float-btn-bookmark { background: var(--color-surface); }
[data-theme="dark"] .cs-panel { background: var(--color-surface); }
[data-theme="dark"] .dropdown-menu { background: var(--color-surface); border-color: var(--color-border); }
[data-theme="dark"] .mobile-nav { background: var(--color-surface); }
[data-theme="dark"] .mobile-nav-overlay { background: rgba(0,0,0,.6); }
[data-theme="dark"] .platform-footer { border-top-color: var(--color-border); }
[data-theme="dark"] .tool-card:hover { border-color: var(--color-primary); }
[data-theme="dark"] .article-card:hover { box-shadow: var(--shadow-lg); }
[data-theme="dark"] .platform-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-lg); }

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

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    transition: background-color 0.3s ease, color 0.3s ease;
}



a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font: inherit; border: none; background: none; }
input { font: inherit; }

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

/* --- Typography --- */
.text-gradient {
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* --- Buttons --- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 10px 22px; border-radius: var(--radius-sm); font-weight: 600; font-size: 14px;
    transition: all var(--transition); white-space: nowrap; border: 2px solid transparent;
}
.btn-primary {
    background: var(--color-primary); color: #fff;
}
.btn-primary:hover { background: var(--color-primary-dark); transform: translateY(-1px); box-shadow: var(--shadow); }
.btn-outline {
    border-color: var(--color-border); color: var(--color-text); background: var(--color-surface);
}
.btn-outline:hover { border-color: var(--color-primary); color: var(--color-primary); }
.btn-sm { padding: 6px 14px; font-size: 13px; }
.btn-lg { padding: 14px 32px; font-size: 16px; border-radius: var(--radius); }
.btn-block { display: flex; width: 100%; }
.btn-icon {
    display: inline-flex; align-items: center; justify-content: center; width: 40px; height: 40px;
    border-radius: var(--radius-sm); color: var(--color-text-secondary); transition: all var(--transition);
}
.btn-icon:hover { background: var(--color-bg); color: var(--color-primary); }

/* ============================================   Header & Navigation
   ============================================ */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    background: rgba(255,255,255,.92); backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border); height: var(--header-height);
    transition: box-shadow var(--transition);
}
.header.scrolled { box-shadow: var(--shadow); }

.header-inner {
    display: flex; align-items: center; height: 100%; gap: 32px;
}

.logo {
    display: flex; align-items: center; gap: 4px; font-weight: 800; font-size: 22px;
    flex-shrink: 0;
}
.logo-img {
    height: 68px; width: auto; flex-shrink: 0; border-radius: 8px;
}

/* Desktop Nav */
.nav { margin-right: auto; }
.nav-list { display: flex; gap: 4px; }
.nav-link {
    display: block; padding: 8px 16px; border-radius: var(--radius-sm); font-size: 15px;
    font-weight: 500; color: var(--color-text-secondary); transition: all var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--color-primary); background: var(--color-primary-light); }
.nav-link .arrow { font-size: 10px; margin-left: 4px; transition: transform var(--transition); }

/* Dropdown */
.dropdown { position: relative; }
.dropdown-menu {
    position: absolute; top: 100%; left: 0; min-width: 180px; padding: 8px;
    background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius);
    box-shadow: var(--shadow-xl); opacity: 0; visibility: hidden;
    transform: translateY(8px); transition: all 0.2s ease; z-index: 1001;
}
.dropdown:hover .dropdown-menu,
.dropdown:focus-within .dropdown-menu,
.dropdown.pinned .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(4px); }
/* pinned状态下，悬浮二级分类仍可展开对应子菜单 */
.dropdown.pinned .dropdown-sub:hover > .dropdown-submenu { opacity: 1; visibility: visible; transform: translateX(0); }
.dropdown:hover .dropdown-toggle .arrow { transform: rotate(180deg); }

.dropdown-menu li a {
    display: block; padding: 10px 14px; border-radius: var(--radius-sm); font-size: 14px;
    color: var(--color-text-secondary); transition: all var(--transition);
}
.dropdown-menu li a:hover { background: var(--color-bg); color: var(--color-primary); }

/* Second-level Cascading Submenu */
.dropdown-sub { position: relative; }
.dropdown-sub > a {
    display: flex; align-items: center; justify-content: space-between;
}
.sub-arrow { font-size: 10px; margin-left: 8px; color: var(--color-text-tertiary); }
.dropdown-submenu {
    position: absolute; left: calc(100% + 12px); top: -8px; min-width: 150px; padding: 8px;
    background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius); box-shadow: var(--shadow-xl);
    opacity: 0; visibility: hidden; transform: translateX(8px);
    transition: all 0.2s ease; z-index: 1002; max-height: 360px; overflow-y: auto;
}
.dropdown-sub:hover > .dropdown-submenu,
.dropdown-sub:focus-within > .dropdown-submenu {
    opacity: 1; visibility: visible; transform: translateX(0);
}
.dropdown-sub:hover > a { background: var(--color-bg); color: var(--color-primary); }
.dropdown-sub:hover > a .sub-arrow { color: var(--color-primary); }

.dropdown-submenu li a {
    display: block; padding: 8px 14px; border-radius: var(--radius-sm); font-size: 13px;
    color: var(--color-text-secondary); transition: all var(--transition); white-space: nowrap;
}
.dropdown-submenu li a:hover { background: var(--color-bg); color: var(--color-primary); }

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

/* Header Follow Dropdown */
.header-follow { position: relative; }
.btn-follow-text {
    display: inline-flex; align-items: center; height: 40px; padding: 0 12px;
    font-size: 14px; color: var(--color-text-secondary); cursor: pointer;
    border-radius: var(--radius-sm); transition: all var(--transition);
}
.btn-follow-text:hover { background: var(--color-bg); color: var(--color-primary); }
.header-follow-dropdown {
    position: absolute; top: 100%; right: 0; margin-top: 8px;
    opacity: 0; visibility: hidden; transform: translateY(-4px);
    transition: all 0.2s ease;
    z-index: 1001;
}
.header-follow-dropdown.open { opacity: 1; visibility: visible; transform: translateY(0); }
.header-follow-card {
    background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); box-shadow: var(--shadow-xl);
    padding: 22px 26px 18px; text-align: center; width: 220px;
}
.header-follow-card h4 { font-size: 15px; font-weight: 700; color: var(--color-text); margin-bottom: 12px; }
.header-follow-card img { width: 150px; height: 150px; border-radius: var(--radius); margin-bottom: 8px; }
.header-follow-card p { font-size: 13px; color: var(--color-text-secondary); margin: 0; }
.header-follow-hint { font-size: 11px !important; opacity: .7; margin-top: 4px !important; }

@media (max-width: 768px) {
    .header-follow { display: none; }
}

/* Header Search Dropdown */
.header-search { position: relative; }
.header-search-dropdown {
    position: absolute; top: 100%; right: 0; margin-top: 8px;
    width: 280px; padding: 12px;
    background: var(--color-surface); border: 1px solid var(--color-border);
    border-radius: var(--radius); box-shadow: var(--shadow-xl);
    opacity: 0; visibility: hidden; transform: translateY(-8px);
    transition: all 0.2s ease; z-index: 1001;
}
@media (max-width: 480px) {
    .header-search-dropdown {
        position: fixed; top: var(--header-height); left: 12px; right: 12px;
        width: auto; margin-top: 0; border-radius: 0 0 var(--radius) var(--radius);
    }
}
.header-search-dropdown.open { opacity: 1; visibility: visible; transform: translateY(0); }
.header-search-input {
    width: 100%; padding: 10px 14px; border: 2px solid var(--color-border);
    border-radius: var(--radius-sm); font-size: 14px; outline: none;
    background: var(--color-bg); color: var(--color-text);
    transition: border-color var(--transition);
}
.header-search-input:focus { border-color: var(--color-primary); }

/* Hamburger */
.hamburger {
    display: none; flex-direction: column; justify-content: center; gap: 5px;
    width: 36px; height: 36px; padding: 6px; border-radius: var(--radius-sm); transition: all var(--transition);
}
.hamburger span { display: block; width: 100%; height: 2px; background: var(--color-text); border-radius: 2px; transition: all var(--transition); }
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* Mobile Nav */
.mobile-nav-overlay { display: none; position: fixed; inset: 0; z-index: 998; background: rgba(0,0,0,.4); }
.mobile-nav {
    display: none; position: fixed; top: 0; right: 0; bottom: 0; width: 300px; max-width: 85vw;
    background: var(--color-surface); z-index: 999; padding: 20px; overflow-y: auto;
    box-shadow: var(--shadow-xl); transform: translateX(100%); transition: transform 0.3s ease;
}
.mobile-nav.open { transform: translateX(0); }
.mobile-nav-overlay.open { display: block; }

.mobile-nav-list { display: flex; flex-direction: column; gap: 4px; margin-top: 60px; }
.mobile-nav-link, .mobile-nav-toggle {
    display: block; padding: 12px 16px; border-radius: var(--radius-sm); font-size: 16px;
    font-weight: 500; color: var(--color-text); width: 100%; text-align: left;
    transition: all var(--transition);
}
.mobile-nav-link:hover, .mobile-nav-toggle:hover { background: var(--color-bg); color: var(--color-primary); }
.mobile-nav-link.active { color: var(--color-primary); background: var(--color-primary-light); }

.mobile-nav-toggle .arrow { font-size: 10px; transition: transform var(--transition); }
.mobile-nav-toggle.open .arrow { transform: rotate(180deg); }

.mobile-subnav { display: none; padding-left: 16px; margin-bottom: 4px; }
.mobile-subnav.open { display: block; }
.mobile-subnav li a {
    display: block; padding: 8px 16px; border-radius: var(--radius-sm); font-size: 14px;
    color: var(--color-text-secondary);
}
.mobile-subnav li a:hover { color: var(--color-primary); background: var(--color-bg); }

.mobile-nav-actions { display: flex; flex-direction: column; gap: 8px; margin-top: 24px; padding: 0 8px; }

/* ============================================   Hero Section
   ============================================ */
.hero {
    padding: calc(var(--header-height) + 60px) 0 20px;
    background: linear-gradient(180deg, #eaf1fe 0%, var(--color-bg) 100%);
    overflow: hidden;
}
.hero-inner {
    display: flex; align-items: center; gap: 60px;
}
.hero-content { flex: 1; }
.hero-title {
    font-size: clamp(32px, 5vw, 52px); font-weight: 800; line-height: 1.2; letter-spacing: -.02em;
    margin-bottom: 20px;
}
.hero-desc { font-size: 18px; color: var(--color-text-secondary); max-width: 520px; margin-bottom: 32px; line-height: 1.7; }
.hero-search { margin-bottom: 40px; }
.hero-search form { display: flex; gap: 10px; max-width: 500px; }
.hero-search-input {
    flex: 1; padding: 14px 20px; border: 2px solid var(--color-border); border-radius: var(--radius);
    font-size: 15px; background: var(--color-surface); transition: all var(--transition);
}
.hero-search-input:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(61,121,229,.15); }

.hero-stats { display: flex; gap: 40px; }
.stat-number { display: block; font-size: 28px; font-weight: 800; color: var(--color-primary); }
.stat-label { font-size: 14px; color: var(--color-text-secondary); }

/* Hero Visual */
.hero-visual {
    flex: 1; position: relative; height: 380px; display: none;
}
@media (min-width: 900px) { .hero-visual { display: block; } }

.hero-card {
    position: absolute; display: flex; align-items: center; gap: 6px;
    padding: 9px 16px; background: var(--color-surface); border-radius: 20px;
    box-shadow: var(--shadow); font-weight: 600; font-size: 13px;
    animation-duration: 3.5s; animation-iteration-count: infinite;
    animation-timing-function: ease-in-out; white-space: nowrap;
}
.hero-card-icon { font-size: 16px; }

/* Scattered naturally across the visual area */
.hero-card-1 { top: 0%; left: 8%; animation-name: drift1; animation-delay: 0s; animation-duration: 3.2s; }
.hero-card-2 { top: 3%; right: 16%; animation-name: drift2; animation-delay: 0.4s; animation-duration: 3.8s; }
.hero-card-3 { top: 14%; left: 0%; animation-name: drift3; animation-delay: 0.8s; animation-duration: 2.9s; }
.hero-card-4 { top: 18%; right: 2%; animation-name: drift1; animation-delay: 1.1s; animation-duration: 3.5s; }
.hero-card-5 { top: 30%; left: 18%; animation-name: drift2; animation-delay: 1.5s; animation-duration: 3.1s; }
.hero-card-6 { top: 34%; right: 18%; animation-name: drift3; animation-delay: 0.2s; animation-duration: 3.7s; }
.hero-card-7 { top: 46%; left: 0%; animation-name: drift1; animation-delay: 1.9s; animation-duration: 2.8s; }
.hero-card-8 { top: 50%; right: 4%; animation-name: drift2; animation-delay: 0.6s; animation-duration: 3.4s; }
.hero-card-9 { top: 62%; left: 20%; animation-name: drift3; animation-delay: 2.2s; animation-duration: 3.6s; }
.hero-card-10 { top: 66%; right: 14%; animation-name: drift1; animation-delay: 1.3s; animation-duration: 3.0s; }
.hero-card-11 { top: 78%; left: 8%; animation-name: drift2; animation-delay: 0.9s; animation-duration: 3.3s; }
.hero-card-12 { top: 85%; right: 8%; animation-name: drift3; animation-delay: 1.7s; animation-duration: 3.5s; }

.hero-glow {
    position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%);
    width: 240px; height: 240px; border-radius: 50%;
    background: radial-gradient(circle, rgba(61,121,229,.25) 0%, rgba(61,121,229,.1) 35%, transparent 70%);
    pointer-events: none;
}

/* Irregular drift animations — varied directions and amplitudes */
@keyframes drift1 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    25% { transform: translate(6px, -14px) rotate(2deg); }
    50% { transform: translate(-4px, -6px) rotate(-1deg); }
    75% { transform: translate(8px, 4px) rotate(1deg); }
}
@keyframes drift2 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    30% { transform: translate(-8px, -10px) rotate(-2deg); }
    60% { transform: translate(5px, 2px) rotate(1.5deg); }
    85% { transform: translate(-3px, -12px) rotate(-1deg); }
}
@keyframes drift3 {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    20% { transform: translate(4px, 8px) rotate(1deg); }
    45% { transform: translate(-7px, -12px) rotate(-1.5deg); }
    70% { transform: translate(3px, -4px) rotate(0.5deg); }
}

/* ============================================   Sections Shared
   ============================================ */
.section { padding: 80px 0; }
.section-header { text-align: center; margin-bottom: 38px; }
.section-tag {
    display: inline-block; padding: 6px 16px; background: var(--color-primary-light);
    color: var(--color-primary); border-radius: 100px; font-size: 13px; font-weight: 600;
    margin-bottom: 16px;
}
.section-title { font-size: clamp(24px, 3.5vw, 36px); font-weight: 800; margin-bottom: 12px; letter-spacing: -.01em; }
.section-desc { font-size: 17px; color: var(--color-text-secondary); max-width: 560px; margin: 0 auto; }
.section-actions { text-align: center; margin-top: 48px; }

/* ============================================   Categories Grid
   ============================================ */
.categories { background: var(--color-surface); }
.categories-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px;
}
.category-card {
    padding: 32px; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    transition: all 0.3s ease; position: relative; overflow: hidden;
}
.category-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 4px;
    background: var(--card-color); transform: scaleX(0); transition: transform 0.3s ease;
}
.category-card:hover { border-color: var(--card-color); box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.category-card:hover::before { transform: scaleX(1); }

.category-icon-wrapper {
    width: 56px; height: 56px; display: flex; align-items: center; justify-content: center;
    background: color-mix(in srgb, var(--card-color) 10%, transparent);
    border-radius: var(--radius); margin-bottom: 20px;
}
.category-icon { font-size: 28px; }
.category-name { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.category-desc { color: var(--color-text-secondary); font-size: 14px; line-height: 1.7; margin-bottom: 16px; }
.category-link {
    font-size: 14px; font-weight: 600; color: var(--card-color); transition: gap var(--transition);
    display: inline-flex; align-items: center; gap: 4px;
}
.category-link:hover { gap: 8px; }

/* ============================================   Articles Grid
   ============================================ */
.articles { padding: 60px 0; }
.articles-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 28px;
}
.article-card {
    background: var(--color-surface); border-radius: var(--radius-lg); overflow: hidden;
    border: 1px solid var(--color-border); transition: all 0.3s ease;
}
.article-card:hover { box-shadow: var(--shadow-lg); transform: translateY(-4px); }
.article-thumb { position: relative; aspect-ratio: 16/10; overflow: hidden; background: var(--color-bg); }
.article-thumb img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.4s ease; }
.article-card:hover .article-thumb img { transform: scale(1.05); }
.article-tag {
    position: absolute; top: 12px; left: 12px; padding: 4px 12px;
    background: rgba(0,0,0,.6); color: #fff; border-radius: 100px; font-size: 12px; font-weight: 500;
}
.article-body { padding: 20px 24px 24px; }


.article-title { font-size: 17px; font-weight: 700; line-height: 1.5; margin-bottom: 10px; }
.article-title a:hover { color: var(--color-primary); }
.article-excerpt {
    font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; margin-bottom: 16px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.article-meta { display: flex; gap: 16px; font-size: 13px; color: var(--color-text-secondary); }

/* ============================================   Features
   ============================================ */
.features { background: var(--color-surface); }
.features-grid {
    display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 32px;
    text-align: center;
}
.feature-icon { font-size: 40px; margin-bottom: 16px; }
.feature-item h3 { font-size: 18px; font-weight: 700; margin-bottom: 8px; }
.feature-item p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }

/* ============================================   FAQ
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; display: flex; flex-direction: column; gap: 12px; }
.faq-item {
    border: 1px solid var(--color-border); border-radius: var(--radius); overflow: hidden;
    background: var(--color-surface); transition: all var(--transition);
}
.faq-item[open] { border-color: var(--color-primary); box-shadow: var(--shadow-sm); }

.faq-question {
    padding: 20px 24px; font-weight: 600; font-size: 16px; cursor: pointer; list-style: none;
    display: flex; justify-content: space-between; align-items: center; user-select: none;
}
.faq-question::-webkit-details-marker { display: none; }
.faq-question::after {
    content: '▾'; font-size: 12px; transition: transform var(--transition);
    color: var(--color-text-secondary); flex-shrink: 0; margin-left: 12px;
}
.faq-item[open] .faq-question::after { transform: rotate(180deg); color: var(--color-primary); }
.faq-answer { padding: 0 24px 20px; }
.faq-answer p { font-size: 15px; color: var(--color-text-secondary); line-height: 1.8; }

/* ============================================   Footer
   ============================================ */
.footer { background: #0f172a; color: #94a3b8; padding: 60px 0 0; }
.footer-inner { display: flex; gap: 80px; flex-wrap: wrap; }
.footer-brand { flex: 1; min-width: 260px; }
.footer-brand p { margin-top: 16px; font-size: 14px; line-height: 1.8; }
.footer-brand .logo-text { color: #fff; }
.footer-links { display: flex; gap: 60px; flex-wrap: wrap; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 16px; }
.footer-col ul { display: flex; flex-direction: column; gap: 10px; }
.footer-col ul li a { font-size: 14px; transition: color var(--transition); }
.footer-col ul li a:hover { color: #fff; }
.footer-bottom { border-top: 1px solid rgba(148,163,184,.1); margin-top: 48px; padding: 20px 0; text-align: center; font-size: 13px; }
.footer-bottom a { color: #cbd5e1; text-decoration: underline; }
.footer-bottom a:hover { color: #fff; }

/* ============================================   Floating Widgets
   ============================================ */
.floating-widgets { position: fixed; right: 24px; bottom: 24px; z-index: 990; display: flex; flex-direction: column; gap: 12px; }
.float-btn {
    width: 52px; height: 52px; border-radius: 50%; display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-lg); transition: all 0.3s ease; position: relative;
}
.float-btn:hover { transform: translateY(-2px); box-shadow: var(--shadow-xl); }
.float-btn-cs {
    background: var(--color-primary); color: #fff; width: auto; border-radius: 100px;
    padding: 0 20px; gap: 8px; min-width: 52px;
}
.float-btn-cs:hover { background: var(--color-primary-dark); }
.float-btn-label { font-size: 13px; font-weight: 600; white-space: nowrap; }
.float-btn-bookmark {
    background: var(--color-surface); color: #f59e0b; border: 1px solid var(--color-border);
    width: auto; border-radius: 100px; padding: 0 18px; gap: 6px; min-width: 52px;
}
.float-btn-bookmark:hover { color: #d97706; border-color: #f59e0b; background: #fffbeb; }

.float-btn-follow {
    background: var(--color-surface); color: #10b981; border: 1px solid var(--color-border);
    width: auto; border-radius: 100px; padding: 0 18px; gap: 6px; min-width: 52px;
}
.float-btn-follow:hover { color: #059669; border-color: #10b981; background: #ecfdf5; }

.float-btn-top {
    background: var(--color-surface); color: var(--color-text-secondary); border: 1px solid var(--color-border);
    opacity: 0; visibility: hidden; transition: opacity 0.3s, visibility 0.3s, transform 0.3s;
}
.float-btn-top.visible { opacity: 1; visibility: visible; }
.float-btn-top:hover { color: var(--color-primary); border-color: var(--color-primary); }

/* Contact Panel */
.cs-panel {
    position: fixed; right: 24px; bottom: 140px; width: 340px; max-width: calc(100vw - 48px);
    background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl);
    z-index: 989; overflow: hidden; display: flex; flex-direction: column;
    opacity: 0; visibility: hidden; transform: translateY(20px) scale(.95);
    transition: all 0.25s ease;
}
.cs-panel.open { opacity: 1; visibility: visible; transform: translateY(0) scale(1); }
.cs-panel-header {
    display: flex; justify-content: space-between; align-items: center; padding: 16px 20px;
    background: var(--color-primary); color: #fff;
}
.cs-panel-header h3 { font-size: 16px; font-weight: 600; }
.cs-panel-close { color: #fff; font-size: 18px; opacity: .8; transition: opacity var(--transition); }
.cs-panel-close:hover { opacity: 1; }

.cs-panel-body { padding: 20px; }



.contact-panel-list { display: flex; flex-direction: column; gap: 12px; margin-bottom: 20px; }
.contact-panel-item {
    display: flex; align-items: center; gap: 12px; padding: 12px 14px;
    background: var(--color-bg); border-radius: var(--radius);
}
.contact-panel-icon {
    width: 40px; height: 40px; border-radius: var(--radius-sm);
    background: var(--color-primary-light); color: var(--color-primary);
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.contact-panel-label { font-size: 12px; color: var(--color-text-secondary); }
.contact-panel-value { font-size: 14px; font-weight: 600; color: var(--color-text); word-break: break-all; }
.copyable {
    cursor: pointer; transition: color var(--transition);
    user-select: all;
}
.copyable:hover { color: var(--color-primary); }

.contact-panel-qr { text-align: center; padding-top: 4px; }
.contact-panel-qr img { width: 160px; height: 160px; border-radius: var(--radius); margin: 0 auto 10px; }
.contact-panel-qr p { font-size: 13px; color: var(--color-text-secondary); }

/* QR Popup (公众号关注) */
.qr-popup {
    position: fixed; right: 100px; bottom: 180px; z-index: 991;
    opacity: 0; visibility: hidden; transform: translateX(10px) scale(.95);
    transition: all 0.25s ease;
}
.qr-popup.open { opacity: 1; visibility: visible; transform: translateX(0) scale(1); }
.qr-popup-card {
    background: var(--color-surface); border-radius: var(--radius-lg); box-shadow: var(--shadow-xl);
    padding: 24px 28px 20px; text-align: center; position: relative; width: 220px;
}
.qr-popup-card::after {
    content: ''; position: absolute; right: -8px; top: 50%; transform: translateY(-50%);
    border-left: 8px solid var(--color-surface);
    border-top: 8px solid transparent; border-bottom: 8px solid transparent;
}
.qr-popup-close {
    position: absolute; top: 8px; right: 10px; color: var(--color-text-secondary);
    font-size: 16px; opacity: .6; transition: opacity var(--transition);
}
.qr-popup-close:hover { opacity: 1; color: var(--color-text); }
.qr-popup-card h4 { font-size: 16px; font-weight: 700; color: var(--color-text); margin-bottom: 14px; }
.qr-popup-card img { width: 160px; height: 160px; border-radius: var(--radius); margin-bottom: 10px; display: block; margin-left: auto; margin-right: auto; }
.qr-popup-card p { font-size: 13px; color: var(--color-text-secondary); margin: 0; }
.qr-popup-hint { font-size: 11px !important; color: var(--color-text-secondary); opacity: .7; margin-top: 4px !important; }
@media (max-width: 768px) {
    .qr-popup { right: 16px; bottom: 200px; }
    .qr-popup-card::after { right: auto; left: 50%; top: auto; bottom: -8px; transform: translateX(-50%); border-left: 8px solid transparent; border-right: 8px solid transparent; border-top: 8px solid var(--color-surface); }
}

/* ============================================   Site Notice
   ============================================ */
.site-notice {
    display: flex; align-items: flex-start; gap: 10px;
    padding: 14px 18px; margin-bottom: 24px;
    background: #fefce8; border: 1px solid #fde68a; border-radius: var(--radius);
    font-size: 13px; color: #92400e; line-height: 1.7;
}
.site-notice > span { font-size: 18px; flex-shrink: 0; margin-top: 1px; }
.site-notice strong { color: #b45309; }

/* ============================================   Filter Bar
   ============================================ */
.filter-bar-row {
    display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap;
    gap: 12px; margin-bottom: 32px;
}
.filter-bar {
    display: flex; flex-wrap: wrap; gap: 8px;
}
.filter-tag {
    padding: 8px 18px; border: 1px solid var(--color-border); border-radius: 100px;
    font-size: 13px; font-weight: 500; color: var(--color-text-secondary); cursor: pointer;
    background: var(--color-surface); transition: all var(--transition);
}
.filter-tag:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-tag.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

/* View toggle */
.view-toggle {
    padding: 8px 16px; border: 1px solid var(--color-border); border-radius: 100px;
    font-size: 13px; font-weight: 500; color: var(--color-text-secondary);
    background: var(--color-surface); cursor: pointer; white-space: nowrap;
    transition: all var(--transition); display: flex; align-items: center; gap: 4px;
}
.view-toggle:hover { border-color: var(--color-primary); color: var(--color-primary); }
.view-toggle.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.view-toggle-icon { font-size: 15px; }

/* ============================================
   List View
   ============================================ */
.platform-grid.list-view {
    display: flex; flex-direction: column; gap: 6px;
}
.platform-grid.list-view .platform-card {
    padding: 12px 20px; flex-direction: row; align-items: center; gap: 0;
    transition: all var(--transition); cursor: pointer;
}
.platform-grid.list-view .platform-card:hover {
    transform: none; border-color: var(--color-primary);
}
.platform-grid.list-view .platform-desc,
.platform-grid.list-view .platform-hot-badge,
.platform-grid.list-view .platform-tutorial-badge {
    display: none;
}
.list-view .platform-header {
    margin-bottom: 0; flex: 0 0 auto; gap: 10px; min-width: 180px;
}
.list-view .platform-logo { width: 32px; height: 32px; font-size: 14px; }
.list-view .platform-name { font-size: 14px; white-space: nowrap; }
.list-view .platform-type-row { flex: 0 0 auto; margin: 0 8px; }
.list-view .platform-type-tag { font-size: 11px; padding: 2px 8px; }
.list-view .platform-protocols {
    display: flex; gap: 3px; flex: 0 0 auto; margin: 0 8px 0 0;
}
.list-view .protocol-badge { font-size: 10px; padding: 2px 6px; }
.list-view .platform-features {
    flex: 1 1 auto; margin: 0 12px; overflow: hidden;
    display: flex; flex-wrap: wrap; gap: 4px;
}
.list-view .platform-features span {
    font-size: 12px; padding: 3px 10px;
}
/* Show compact footer with price + register btn */
.list-view .platform-footer {
    display: flex; align-items: center; gap: 10px;
    border: none; padding: 0; margin: 0; flex: 0 0 auto;
}
.list-view .platform-price { font-size: 12px; white-space: nowrap; }
.list-view .platform-price strong { font-size: 15px; }
.list-view .platform-footer .btn-sm { padding: 5px 12px; font-size: 12px; }
/* Expand chevron */
.list-view .platform-card .list-expand {
    margin-left: 8px; font-size: 14px; color: var(--color-text-secondary);
    transition: transform var(--transition); flex: 0 0 auto;
}
.list-view .platform-card.expanded .list-expand {
    transform: rotate(90deg);
}
/* Expanded state - show full content */
.list-view .platform-card.expanded {
    flex-direction: column; align-items: stretch; padding: 20px 24px;
    cursor: default;
}
.list-view .platform-card.expanded .platform-desc,
.list-view .platform-card.expanded .platform-protocols,
.list-view .platform-card.expanded .platform-footer,
.list-view .platform-card.expanded .platform-tutorial-badge {
    display: flex;
}
.list-view .platform-card.expanded .platform-hot-badge {
    display: block;
}
.list-view .platform-card.expanded .platform-header {
    margin-bottom: 14px; min-width: 0;
}
.list-view .platform-card.expanded .platform-logo { width: 48px; height: 48px; font-size: 20px; }
.list-view .platform-card.expanded .platform-name { font-size: 17px; }
.list-view .platform-card.expanded .platform-type-row { margin: 2px 0 0 0; }
.list-view .platform-card.expanded .platform-type-tag { font-size: 12px; padding: 2px 10px; }
.list-view .platform-card.expanded .platform-protocols { margin: 12px 0 0; gap: 4px; }
.list-view .platform-card.expanded .protocol-badge { font-size: 12px; padding: 3px 10px; }
.list-view .platform-card.expanded .platform-features { margin: 14px 0 0; }
.list-view .platform-card.expanded .platform-features span { font-size: 13px; }
.list-view .platform-card.expanded .platform-features span:not(:first-of-type) {
    display: inline-block;
}
.list-view .platform-card.expanded .platform-price { margin-left: 0; margin-top: 12px; font-size: 13px; }
.list-view .platform-card.expanded .platform-price strong { font-size: 18px; }
.list-view .platform-card.expanded .platform-footer {
    border-top: 1px solid var(--color-border); padding-top: 16px;
    margin-top: 14px;
}
.list-view .platform-card.expanded .platform-footer .btn-sm { padding: 6px 14px; font-size: 13px; }
.list-view .platform-card.expanded .list-expand { display: none; }

/* ============================================   Platform Cards Grid
   ============================================ */
.platform-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(360px, 1fr)); gap: 24px;
}
.platform-card {
    background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    padding: 24px; transition: all 0.3s ease; display: flex; flex-direction: column; position: relative;
    scroll-margin-top: calc(var(--header-height) + 16px);
}
.platform-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.platform-card.hidden { display: none; }
.platform-card.collapsed { display: none; }

/* Show more button */
.platform-show-more {
    text-align: center; margin-top: 28px;
}

/* Hot badge */
.platform-hot-badge {
    position: absolute; top: -1px; right: 20px;
    background: linear-gradient(135deg, #e84c5c, #d43547); color: #fff;
    padding: 4px 14px 6px; border-radius: 0 0 6px 6px;
    font-size: 11px; font-weight: 700; letter-spacing: 1px;
    box-shadow: 0 2px 6px rgba(244,63,94,.35);
}

/* Tutorial badge - 右侧白色书签效果 */
.platform-tutorial-badge {
    position: absolute; top: 40px; right: -1px;
    background: var(--color-surface); color: var(--color-primary);
    border: 1px solid var(--color-border);
    border-right: none;
    padding: 6px 11px 6px 15px; border-radius: 8px 0 0 8px;
    font-size: 12px; font-weight: 600;
    text-decoration: none; z-index: 1;
    box-shadow: -2px 2px 8px rgba(0,0,0,.08);
    transition: all var(--transition);
}
.platform-tutorial-badge::after {
    content: ' →';
    font-size: 11px;
}
.platform-tutorial-badge:hover {
    color: var(--color-primary);
    border-color: var(--color-primary);
    padding-right: 15px;
    box-shadow: -3px 3px 12px rgba(0,0,0,.12);
}

.platform-header { display: flex; align-items: center; gap: 14px; margin-bottom: 14px; }
.platform-logo {
    width: 48px; height: 48px; border-radius: var(--radius); display: flex;
    align-items: center; justify-content: center; font-size: 20px; font-weight: 800; flex-shrink: 0;
    object-fit: contain;
}
.platform-info { flex: 1; min-width: 0; }
.platform-name { font-size: 17px; font-weight: 700; margin-bottom: 2px; }
.platform-type-row { display: flex; gap: 4px; margin-top: 2px; }

.platform-desc {
    font-size: 13px; color: var(--color-text-secondary); line-height: 1.7;
    margin-bottom: 14px; flex: 1;
}

/* Protocol Badges */
.platform-protocols { display: flex; gap: 6px; margin-bottom: 12px; flex-wrap: wrap; }
.protocol-badge {
    padding: 3px 10px; border-radius: 100px; font-size: 11px; font-weight: 600;
}
.protocol-badge.http { background: #eaf1fe; color: #3d79e5; }
.protocol-badge.socks5 { background: #fef2f2; color: #ef4444; }
.protocol-badge.l2tp { background: #f0fdf4; color: #10b981; }
.protocol-badge.ss { background: #f5f3ff; color: #8b5cf6; }
.protocol-badge.wireguard { background: #fffbeb; color: #d97706; }

.platform-features {
    display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap;
}
.platform-features span {
    padding: 2px 8px; background: var(--color-bg); border-radius: 4px;
    font-size: 11px; color: var(--color-text-secondary);
}

.platform-type-tag {
    padding: 2px 8px; border-radius: 4px; font-size: 11px; font-weight: 600;
    background: #fefce8; color: #b45309;
}

.platform-footer {
    display: flex; justify-content: space-between; align-items: center;
    padding-top: 16px; border-top: 1px solid var(--color-border);
}
.platform-price { font-size: 13px; color: var(--color-text-secondary); }
.platform-price strong { color: #e84c5c; font-size: 18px; font-weight: 800; }

/* ============================================   Tools Grid
   ============================================ */
.tools-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 24px;
}
.tool-card {
    background: var(--color-surface); border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    padding: 24px; transition: all 0.3s ease; display: flex; flex-direction: column;
}
.tool-card:hover { border-color: var(--color-primary); box-shadow: var(--shadow); }
.tool-icon { font-size: 36px; margin-bottom: 14px; }
.tool-icon img { width: 56px; height: 56px; object-fit: contain; }
.tool-name { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.tool-desc {
    font-size: 13px; color: var(--color-text-secondary); line-height: 1.7; flex: 1; margin-bottom: 14px;
}
.tool-meta { display: flex; gap: 12px; margin-bottom: 16px; }
.tool-type {
    padding: 3px 10px; background: var(--color-primary-light); color: var(--color-primary);
    border-radius: 100px; font-size: 11px; font-weight: 600;
}
.tool-size { font-size: 12px; color: var(--color-text-secondary); align-self: center; }
.tool-actions { display: flex; }

/* ============================================   Toast Notification
   ============================================ */
.toast {
    position: fixed; top: 24px; left: 50%; transform: translateX(-50%);
    background: #1e293b; color: #fff; padding: 14px 28px; border-radius: 12px;
    font-size: 15px; font-weight: 600; z-index: 9999; box-shadow: var(--shadow-xl);
    opacity: 0; transition: opacity 0.35s ease, transform 0.35s ease;
    transform: translateX(-50%) translateY(-12px); pointer-events: none;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast kbd {
    background: rgba(255,255,255,.2); padding: 2px 8px; border-radius: 4px;
    font-family: inherit; font-size: 13px; margin: 0 2px;
}

/* ============================================   Responsive
   ============================================ */
@media (max-width: 900px) {
    .nav { display: none; }
    .hamburger { display: flex; }
    .mobile-nav { display: block; }
    .mobile-nav-overlay { display: none; }
    .mobile-nav-overlay.open { display: block; }

    .hero-inner { flex-direction: column; text-align: center; }
    .hero-desc { margin-inline: auto; }
    .hero-search form { margin-inline: auto; flex-direction: column; }
    .hero-stats { justify-content: center; }
    .hero-visual { display: none; }

    .categories-grid { grid-template-columns: 1fr; }
    .platform-grid { grid-template-columns: 1fr; }
    .tools-grid { grid-template-columns: 1fr; }
    .articles-grid { grid-template-columns: 1fr; }
    .features-grid { grid-template-columns: 1fr 1fr; }
    .footer-inner { flex-direction: column; gap: 40px; }
}

@media (max-width: 480px) {
    .header-actions .btn { display: none; }
    .hero { padding-top: calc(var(--header-height) + 30px); }
    .hero-stats { gap: 20px; }
    .stat-number { font-size: 22px; }
    .features-grid { grid-template-columns: 1fr; }
    .footer-links { flex-direction: column; gap: 32px; }
    .cs-panel { right: 8px; left: 8px; max-width: none; }
}

/* 隐藏 section 小标签 */
.section-tag { display: none; }

/* ==========================================
   Image Lightbox (图片点击放大)
   ========================================== */
.article-content .step-screenshot img {
    cursor: zoom-in;
    transition: opacity var(--transition);
}
.article-content .step-screenshot img:hover {
    opacity: 0.92;
}

.lightbox-overlay {
    position: fixed;
    inset: 0;
    z-index: 10000;
    background: rgba(0, 0, 0, 0.85);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
    cursor: zoom-out;
}
.lightbox-overlay.open {
    opacity: 1;
    visibility: visible;
}
.lightbox-overlay img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    transition: transform 0.3s ease;
}
.lightbox-overlay.open img {
    transform: scale(1);
}

.lightbox-close {
    position: fixed;
    top: 20px;
    right: 24px;
    z-index: 10001;
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(255, 255, 255, 0.15);
    color: #fff;
    font-size: 28px;
    line-height: 1;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, background 0.2s;
}
.lightbox-close.visible {
    opacity: 1;
    visibility: visible;
}
.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.3);
}

.lightbox-preload {
    display: none;
}