/* ===== 钉钉进步体字体 ===== */
        @font-face {
            font-family: 'DingTalk JinBuTi';
            src: url('fonts/DingTalk JinBuTi.ttf') format('truetype');
            font-weight: normal;
            font-style: normal;
            font-display: swap;
        }

        /* ===== 全局重置 & 滚动条 ===== */
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'DingTalk JinBuTi', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Microsoft YaHei', sans-serif;
        }
        html, body { overflow-x: hidden; }

        ::-webkit-scrollbar {
            width: 6px;
            height: 6px;
        }
        ::-webkit-scrollbar-track {
            background: rgba(255, 255, 255, 0.03);
            border-radius: 6px;
        }
        ::-webkit-scrollbar-thumb {
            background: rgba(2, 255, 142, 0.25);
            border-radius: 6px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: rgba(2, 255, 142, 0.5);
        }
        * {
            scrollbar-width: thin;
            scrollbar-color: rgba(2, 255, 142, 0.25) rgba(255, 255, 255, 0.03);
        }

        .bg-layer {
            position: fixed;
            inset: 0;
            z-index: 0;
            background: #0a0f0d center/cover;
            opacity: 0;
            transition: opacity 0.6s ease;
        }
        .bg-layer.loaded {
            opacity: 1;
        }
        .bg-layer::before {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(180deg, rgba(10, 20, 15, 0.82) 0%, rgba(10, 15, 12, 0.7) 100%);
        }
        .glow {
            position: fixed;
            z-index: 0;
            border-radius: 50%;
            filter: blur(90px);
            pointer-events: none;
        }
        .glow-1 { width: 420px; height: 420px; top: -120px; left: -120px; background: rgba(2, 255, 142, 0.07); }
        .glow-2 { width: 380px; height: 380px; bottom: -100px; right: -100px; background: rgba(2, 255, 142, 0.05); }

        .container {
            position: relative;
            z-index: 1;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 2rem 1.5rem 1.5rem;
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(28px); }
            to { opacity: 1; transform: translateY(0); }
        }
        @keyframes fadeInLeft {
            from { opacity: 0; transform: translateX(-48px); }
            to { opacity: 1; transform: translateX(0); }
        }
        @keyframes fadeInRight {
            from { opacity: 0; transform: translateX(48px); }
            to { opacity: 1; transform: translateX(0); }
        }
        @keyframes fadeInScale {
            from { opacity: 0; transform: scale(0.92); }
            to { opacity: 1; transform: scale(1); }
        }
        .reveal { opacity: 0; }
        .reveal.in { animation-duration: 0.7s; animation-timing-function: ease; animation-fill-mode: forwards; }
        .reveal.in.up { animation-name: fadeInUp; }
        .reveal.in.left { animation-name: fadeInLeft; }
        .reveal.in.right { animation-name: fadeInRight; }
        .reveal.in.scale { animation-name: fadeInScale; }

        /* ===== Hero ===== */
        .hero {
            width: 100%;
            max-width: 980px;
            text-align: center;
            padding: 3rem 0 5rem;
            position: relative;
        }
        .hero::before {
            content: '';
            position: absolute;
            inset: -2rem -6% -2rem -6%;
            background: radial-gradient(ellipse at center 40%, rgba(8, 12, 10, 0.55) 0%, transparent 65%);
            z-index: -1;
            pointer-events: none;
        }

        .hero-logo { margin-bottom: 1.4rem; }
        .hero-logo img { height: 68px; width: auto; }
        .hero-brand {
            display: block;
            font-size: 0.95rem;
            font-weight: 700;
            color: rgba(2, 255, 142, 0.75);
            letter-spacing: 0.34em;
            margin-top: 0.7rem;
            text-indent: 0.34em;
        }
        .hero-title {
            font-size: clamp(2.4rem, 7vw, 4.6rem);
            font-weight: 800;
            line-height: 1.18;
            color: #f4fbf7;
            margin-bottom: 1.6rem;
            letter-spacing: -0.025em;
            text-shadow: 0 2px 24px rgba(0, 0, 0, 0.6), 0 0 4px rgba(0, 0, 0, 0.8);
        }
        .hero-title em { font-style: normal; color: #ff6b6b; }
        .hero-sub {
            font-size: 1.15rem;
            color: rgba(255, 255, 255, 0.85);
            margin-bottom: 2.6rem;
            line-height: 1.75;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
            text-shadow: 0 1px 8px rgba(0, 0, 0, 0.7);
        }
        .hero-sub .hl { color: #02ff8e; font-weight: 600; }
        .hero-cta {
            display: flex;
            justify-content: center;
            gap: 1rem;
            flex-wrap: wrap;
            margin-bottom: 1.8rem;
        }
        .btn-explore {
            display: inline-flex;
            align-items: center;
            gap: 0.75rem;
            padding: 1.1rem 2.6rem;
            border-radius: 8px;
            text-decoration: none;
            font-size: 1.1rem;
            font-weight: 600;
            background: linear-gradient(135deg, #02ff8e, #00cc6a);
            color: #001a0d;
            border: none;
            cursor: pointer;
            box-shadow: 0 4px 30px rgba(2, 255, 142, 0.35);
            transition: box-shadow 0.25s, filter 0.25s;
        }
        .btn-explore:hover {
            filter: brightness(1.08);
            box-shadow: 0 6px 40px rgba(2, 255, 142, 0.5);
        }
        .btn-api {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            padding: 1.1rem 2rem;
            border-radius: 8px;
            text-decoration: none;
            font-size: 1rem;
            font-weight: 500;
            background: rgba(2, 255, 142, 0.08);
            color: rgba(2, 255, 142, 0.85);
            border: 1px solid rgba(2, 255, 142, 0.25);
            transition: background 0.25s, color 0.25s, border-color 0.25s;
        }
        .btn-api:hover {
            background: rgba(2, 255, 142, 0.15);
            color: #02ff8e;
            border-color: rgba(2, 255, 142, 0.45);
        }
        .btn-explore:hover .fa-compass { animation: compass-spin 0.4s linear infinite; }
        @keyframes compass-spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        /* URL 对比条 */
        .url-compare {
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 0.8rem;
            max-width: 560px;
            margin: 0 auto;
            padding: 0.9rem 1.2rem;
            background: rgba(0, 0, 0, 0.3);
            border: 1px solid rgba(2, 255, 142, 0.15);
            border-radius: 8px;
            flex-wrap: wrap;
        }
        .url-compare .url-old {
            font-family: 'Courier New', monospace;
            font-size: 0.8rem;
            color: rgba(255, 255, 255, 0.4);
            text-decoration: line-through;
        }
        .url-compare .url-arrow { color: #02ff8e; font-size: 1.1rem; flex-shrink: 0; }
        .url-compare .url-new {
            font-family: 'Courier New', monospace;
            font-size: 0.88rem;
            color: #02ff8e;
            font-weight: 600;
        }

        /* 信任徽章 */
        .hero-badges {
            display: flex;
            justify-content: center;
            gap: 0.75rem;
            flex-wrap: wrap;
            margin-top: 1.6rem;
        }
        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.35rem 0.9rem;
            border-radius: 999px;
            background: rgba(2, 255, 142, 0.08);
            border: 1px solid rgba(2, 255, 142, 0.25);
            color: #02ff8e;
            font-size: 0.8rem;
        }
        .hero-badge i { font-size: 0.75rem; }

        /* ===== 全站统计条 ===== */
        .hero-stats {
            display: flex;
            justify-content: center;
            gap: 2rem;
            flex-wrap: wrap;
            margin-top: 2rem;
            padding-top: 1.6rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }
        .hero-stat { text-align: center; }
        .hero-stat .num {
            font-size: 1.5rem;
            font-weight: 800;
            color: #02ff8e;
            line-height: 1.2;
        }
        .hero-stat .lbl {
            font-size: 0.78rem;
            color: rgba(255, 255, 255, 0.45);
            margin-top: 0.25rem;
        }

        /* ===== 通用分区 ===== */
        .section {
            width: 100%;
            max-width: 1060px;
            margin-top: 3.5rem;
        }
        .section-head { text-align: center; margin-bottom: 2.2rem; }
        .section-head h2 {
            font-size: clamp(1.5rem, 3vw, 2rem);
            font-weight: 800;
            color: #f4fbf7;
            letter-spacing: 0.02em;
        }
        .section-head p { font-size: 0.95rem; color: rgba(255, 255, 255, 0.45); margin-top: 0.5rem; }
        .glass-card {
            background: rgba(255, 255, 255, 0.035);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: 16px;
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35);
        }

        /* ===== 特性区===== */
        .feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.4rem; }
        .feature-card {
            padding: 2.4rem 2rem;
            text-align: left;
            transition: border-color 0.25s, box-shadow 0.25s;
        }
        .feature-card:hover {
            border-color: rgba(2, 255, 142, 0.3);
            box-shadow: 0 20px 60px rgba(0, 0, 0, 0.35), 0 0 30px rgba(2, 255, 142, 0.08);
        }
        .feature-card i { font-size: 2.2rem; color: #02ff8e; margin-bottom: 1.1rem; display: block; }
        .feature-card h3 { font-size: 1.3rem; color: #f4fbf7; margin-bottom: 0.5rem; font-weight: 700; }
        .feature-card p { font-size: 0.95rem; color: rgba(255, 255, 255, 0.55); line-height: 1.7; }

        /* ===== 对比区 ===== */
        .compare-grid {
            display: grid;
            grid-template-columns: 1fr auto 1fr;
            gap: 1.4rem;
            align-items: stretch;
        }
        .compare-card { padding: 2.4rem 2.2rem; }
        .compare-card .cmp-tag {
            display: inline-block;
            font-size: 0.8rem;
            padding: 0.25rem 0.8rem;
            border-radius: 999px;
            margin-bottom: 1.2rem;
            font-weight: 600;
        }
        .compare-card.bad .cmp-tag {
            background: rgba(255, 71, 87, 0.2);
            color: #ff8b94;
            border: 1px solid rgba(255, 71, 87, 0.5);
        }
        .compare-card.good .cmp-tag {
            background: rgba(2, 255, 142, 0.18);
            color: #02ff8e;
            border: 1px solid rgba(2, 255, 142, 0.5);
        }
        .compare-card h3 { font-size: 1.3rem; color: #f4fbf7; margin-bottom: 1rem; font-weight: 700; }
        .compare-card ul { list-style: none; padding: 0; margin: 0; }
        .compare-card li {
            font-size: 0.95rem;
            color: rgba(255, 255, 255, 0.65);
            line-height: 1.65;
            padding: 0.5rem 0;
            display: flex;
            gap: 0.6rem;
            align-items: flex-start;
        }
        .compare-card li i { margin-top: 0.25rem; font-size: 0.85rem; }
        .compare-card.bad li i { color: #ff6b6b; }
        .compare-card.good li i { color: #02ff8e; }
        .compare-vs {
            display: flex;
            align-items: center;
            justify-content: center;
            color: #02ff8e;
            font-size: 2rem;
            font-weight: 800;
        }
        .cmp-arrow-v { display: none; }

        /* ===== 教程区 ===== */
        .tutorial-frame {
            width: 100%;
            aspect-ratio: 16 / 9;
            border-radius: 10px;
            border: none;
            display: block;
            background: #000;
        }

        /* ===== 赞助商区===== */
        .sponsor-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; }
        .sponsor-slot {
            min-height: 120px;
            border: 1px dashed rgba(2, 255, 142, 0.25);
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            background: rgba(0, 20, 10, 0.35);
            transition: border-color 0.25s, background 0.25s;
            overflow: hidden;
        }
        .sponsor-slot.sponsor-filled {
            border-style: solid;
            border-color: rgba(2, 255, 142, 0.2);
            padding: 0;
            background: rgba(0, 20, 10, 0.5);
        }
        .sponsor-slot.sponsor-filled img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            display: block;
        }
        .sponsor-slot:hover {
            border-color: rgba(2, 255, 142, 0.45);
            background: rgba(2, 255, 142, 0.05);
        }
        .sponsor-empty {
            text-align: center;
            color: rgba(255, 255, 255, 0.3);
            font-size: 0.85rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.4rem;
        }
        .sponsor-empty i { font-size: 1.3rem; color: rgba(2, 255, 142, 0.35); }
        .sponsor-thanks {
            margin-top: 1.2rem;
            text-align: center;
            color: rgba(255, 255, 255, 0.5);
            font-size: 0.9rem;
        }
        .sponsor-thanks a { color: #02ff8e; text-decoration: none; font-weight: 600; }
        .sponsor-thanks a:hover { text-decoration: underline; }
        .sponsor-video {
            width: 100%;
            aspect-ratio: 16 / 9;
            border-radius: 10px;
            border: none;
            display: block;
            margin-top: 1.2rem;
            background: #000;
        }
        .faq-video {
            width: 100%;
            height: 260px;
            border-radius: 8px;
            border: none;
            display: block;
            margin-top: 0.4rem;
            background: #000;
        }

        /* ===== FAQ ===== */
        .faq-container {
            padding: 1.6rem 1.8rem;
            transition: border-color 0.3s;
        }
        .faq-container:hover { border-color: rgba(2, 255, 142, 0.22); }
        .faq-header {
            display: flex;
            align-items: center;
            gap: 0.6rem;
            margin-bottom: 1.2rem;
            padding-bottom: 0.7rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.06);
        }
        .faq-header i { font-size: 1.2rem; color: #02ff8e; }
        .faq-header h3 { font-size: 1.05rem; font-weight: 600; color: #f0faf5; }
        .faq-header span { margin-left: auto; font-size: 0.75rem; color: rgba(255, 255, 255, 0.25); }
        .faq-item { border-bottom: 1px solid rgba(255, 255, 255, 0.05); transition: border-color 0.25s; }
        .faq-item:last-child { border-bottom: none; }
        .faq-question {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0.8rem 0.2rem;
            cursor: pointer;
            user-select: none;
            transition: all 0.2s;
            border-radius: 6px;
            gap: 1rem;
        }
        .faq-question:hover { background: rgba(2, 255, 142, 0.05); }
        .faq-question .q-text { font-size: 0.95rem; font-weight: 500; color: #e8f5ef; transition: color 0.2s; line-height: 1.4; }
        .faq-question:hover .q-text { color: #02ff8e; }
        .faq-question .q-icon {
            flex-shrink: 0;
            font-size: 0.85rem;
            color: rgba(2, 255, 142, 0.5);
            transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1), color 0.25s;
            width: 1.2rem;
            text-align: center;
        }
        .faq-item.active .faq-question .q-icon { transform: rotate(180deg); color: #02ff8e; }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.45s cubic-bezier(0.4, 0, 0.2, 1), padding 0.35s ease, opacity 0.3s ease;
            opacity: 0;
            padding: 0 0.2rem;
        }
        .faq-item.active .faq-answer {
            max-height: 440px;
            opacity: 1;
            padding: 0 0.2rem 0.9rem 0.2rem;
        }
        .faq-answer .a-text { font-size: 0.9rem; line-height: 1.7; color: rgba(255, 255, 255, 0.7); }
        .faq-answer .a-text i { color: #02ff8e; margin-right: 0.2rem; font-size: 0.8rem; opacity: 0.6; }

        /* ===== 页脚 ===== */
        .footer {
            position: relative;
            margin-top: 2rem;
            color: rgba(255, 255, 255, 0.4);
            font-size: 0.85rem;
            text-align: center;
            width: 100%;
        }
        .footer a { color: rgba(255, 255, 255, 0.4); text-decoration: none; transition: color 0.2s; }
        .footer a:hover { color: #02ff8e; }
        .footer .credit { margin-top: 0.3rem; color: rgba(255, 255, 255, 0.25); font-size: 0.78rem; }
        .footer .credit a { color: rgba(2, 255, 142, 0.55); }
        .footer .credit a:hover { color: #02ff8e; }

        /* ===== 响应式 ===== */
        @media (max-width: 900px) {
            .feature-grid { grid-template-columns: 1fr 1fr; }
            .compare-grid { grid-template-columns: 1fr; }
            .compare-vs { padding: 0.9rem 0; }
            .cmp-arrow-h { display: none; }
            .cmp-arrow-v { display: inline; }
            .sponsor-grid { grid-template-columns: 1fr; }
            .container { padding: 1.5rem 1rem 1rem; }
            .hero { padding-top: 1rem; }
        }
        @media (max-width: 640px) {
            .feature-grid { grid-template-columns: 1fr; }
            .feature-card { padding: 1.8rem 1.4rem; }
            .compare-card { padding: 1.8rem 1.4rem; }
            .hero-cta { flex-direction: column; align-items: center; }
            .btn-explore, .btn-api { width: 100%; justify-content: center; }
            .url-compare { gap: 0.5rem; padding: 0.7rem 0.9rem; }
            .url-compare .url-old { font-size: 0.7rem; }
            .url-compare .url-new { font-size: 0.78rem; }
            .faq-container { padding: 1.2rem 1.1rem; }
            .faq-question .q-text { font-size: 0.88rem; }
            .faq-answer .a-text { font-size: 0.84rem; }
            .hero-logo img { height: 56px; }
            .section { margin-top: 2.5rem; }
        }

        /* ===== 开屏加载动画 ===== */
        .splash-screen {
            position: fixed;
            inset: 0;
            background: #050a07;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            gap: 2rem;
            z-index: 9999;
            animation: splash-fade-out 0.8s ease 1.4s forwards;
        }
        @keyframes splash-fade-out {
            to { opacity: 0; pointer-events: none; }
        }
        .splash-screen .splash-logo {
            width: 200px;
            height: auto;
            opacity: 0;
            animation: fadeInUp 0.6s ease 0.3s forwards;
        }
        .splash-screen .infinity-wrap {
            width: 80px;
            height: 40px;
            filter: drop-shadow(0 0 15px rgba(2, 255, 142, 0.6));
        }
        .splash-screen .infinity-wrap .infinity-path {
            fill: none;
            stroke: #02ff8e;
            stroke-width: 2.5;
            stroke-linecap: round;
            stroke-linejoin: round;
            stroke-dasharray: 300;
            stroke-dashoffset: 300;
            animation: infinity-draw 1.2s ease-in-out infinite;
        }
        @keyframes infinity-draw {
            0% { stroke-dashoffset: 300; }
            50% { stroke-dashoffset: 0; }
            100% { stroke-dashoffset: -300; }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        /* ===== 图标微动效 ===== */
        i.fas, i.far, i.fab { transition: color 0.15s ease, transform 0.15s ease; }
        i.fas:not(.fa-spin):hover,
        i.far:not(.fa-spin):hover,
        i.fab:not(.fa-spin):hover { transform: scale(1.08); }