/* roulang page: index */
:root {
            --ink: #07111f;
            --deep: #0b1b30;
            --panel: rgba(17, 38, 65, .72);
            --panel-solid: #102946;
            --blue: #35a9ff;
            --blue-light: #8ed8ff;
            --cyan: #52e2d3;
            --orange: #ffb86b;
            --white: #f5f9ff;
            --muted: #a8bbcf;
            --line: rgba(153, 196, 231, .19);
            --line-bright: rgba(105, 207, 255, .4);
            --radius: 18px;
            --radius-sm: 11px;
            --shadow: 0 22px 60px rgba(0, 0, 0, .25);
            --max: 1180px;
            --ease: 220ms cubic-bezier(.2, .75, .25, 1);
        }

        * { box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            margin: 0;
            color: var(--white);
            background: var(--ink);
            font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans SC", sans-serif;
            font-size: 16px;
            line-height: 1.75;
            -webkit-font-smoothing: antialiased;
        }
        a { color: inherit; text-decoration: none; }
        img, video { display: block; max-width: 100%; }
        button, input { font: inherit; }
        button { cursor: pointer; }
        p, h1, h2, h3 { margin-top: 0; }
        h1, h2, h3 { line-height: 1.2; letter-spacing: 0; }
        .container { width: min(var(--max), calc(100% - 48px)); margin: 0 auto; }

        .site-header {
            position: fixed;
            z-index: 20;
            top: 0;
            left: 0;
            width: 100%;
            border-bottom: 1px solid var(--line);
            background: rgba(7, 17, 31, .82);
            backdrop-filter: blur(18px);
            transition: var(--ease);
        }
        .site-header.compact { background: rgba(7, 17, 31, .96); box-shadow: 0 10px 30px rgba(0,0,0,.22); }
        .brand-row {
            min-height: 72px;
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 24px;
        }
        .brand {
            display: inline-flex;
            align-items: center;
            gap: 12px;
            font-size: 19px;
            font-weight: 800;
            letter-spacing: 0;
            white-space: nowrap;
        }
        .brand-mark {
            position: relative;
            width: 30px;
            height: 30px;
            border: 2px solid var(--cyan);
            border-radius: 9px;
            transform: rotate(45deg);
            box-shadow: 0 0 18px rgba(82,226,211,.35);
        }
        .brand-mark:after {
            content: "";
            position: absolute;
            width: 8px;
            height: 8px;
            left: 9px;
            top: 9px;
            border-radius: 50%;
            background: var(--orange);
        }
        .header-note { color: var(--muted); font-size: 13px; }
        .channel-row {
            border-top: 1px solid rgba(153,196,231,.1);
            min-height: 46px;
            display: flex;
            align-items: center;
        }
        .nav-inner { display: flex; align-items: center; justify-content: space-between; gap: 22px; }
        .nav-links { display: flex; align-items: center; gap: 8px; }
        .nav-link {
            position: relative;
            padding: 7px 17px;
            color: var(--muted);
            font-size: 14px;
            transition: var(--ease);
        }
        .nav-link:after {
            content: "";
            position: absolute;
            left: 17px;
            right: 17px;
            bottom: 0;
            height: 2px;
            background: var(--cyan);
            transform: scaleX(0);
            transition: var(--ease);
        }
        .nav-link:hover, .nav-link.active { color: var(--white); }
        .nav-link.active:after, .nav-link:hover:after { transform: scaleX(1); }
        .nav-status { color: var(--cyan); font-size: 12px; }
        .menu-toggle { display: none; color: var(--white); border: 1px solid var(--line); background: transparent; border-radius: 9px; width: 42px; height: 38px; }

        .hero {
            position: relative;
            min-height: 760px;
            overflow: hidden;
            display: flex;
            align-items: flex-end;
            background: #0a1a2d url("https://images.unsplash.com/photo-1489599849927-2ee91cede3ba?auto=format&fit=crop&w=2000&q=90") center/cover;
        }
        .hero-video {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: .42;
            filter: saturate(.8) contrast(1.08);
        }
        .hero:before {
            content: "";
            position: absolute;
            inset: 0;
            background: linear-gradient(90deg, rgba(5,14,26,.96) 0%, rgba(7,19,35,.76) 43%, rgba(7,19,35,.32) 100%),
                        linear-gradient(0deg, #07111f 0%, transparent 42%);
        }
        .hero:after {
            content: "";
            position: absolute;
            right: -12%;
            bottom: -38%;
            width: 62%;
            height: 80%;
            border: 1px solid rgba(82,226,211,.26);
            transform: rotate(-12deg);
            box-shadow: 0 0 80px rgba(53,169,255,.1);
        }
        .hero-content { position: relative; z-index: 1; padding: 170px 0 94px; max-width: 760px; }
        .eyebrow, .section-kicker {
            display: inline-flex;
            align-items: center;
            gap: 9px;
            color: var(--cyan);
            font-size: 12px;
            letter-spacing: 1.5px;
            font-weight: 700;
            text-transform: uppercase;
        }
        .eyebrow:before, .section-kicker:before { content: ""; width: 7px; height: 7px; background: var(--orange); border-radius: 50%; box-shadow: 0 0 13px var(--orange); }
        .hero h1 { max-width: 720px; margin: 19px 0 22px; font-size: clamp(42px, 6vw, 76px); letter-spacing: -1px; }
        .hero-lead { max-width: 690px; color: #c9d8e9; font-size: 18px; line-height: 1.9; }
        .hero-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 13px; margin: 31px 0 34px; }
        .btn {
            min-height: 48px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 9px;
            padding: 0 21px;
            border: 1px solid transparent;
            border-radius: 10px;
            font-weight: 700;
            transition: var(--ease);
        }
        .btn-primary { color: #031321; background: var(--cyan); box-shadow: 0 0 28px rgba(82,226,211,.25); }
        .btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 36px rgba(82,226,211,.48); }
        .btn-secondary { color: var(--white); border-color: var(--line-bright); background: rgba(16,41,70,.45); }
        .btn-secondary:hover { background: rgba(53,169,255,.2); border-color: var(--blue); }
        .play-button {
            width: 52px;
            height: 52px;
            display: inline-grid;
            place-items: center;
            border: 1px solid rgba(255,255,255,.48);
            border-radius: 50%;
            color: var(--white);
            background: rgba(255,255,255,.11);
            transition: var(--ease);
        }
        .play-button span { margin-left: 3px; font-size: 20px; }
        .play-button:hover { background: var(--blue); border-color: var(--blue); transform: scale(1.06); }
        .hero-points { display: flex; flex-wrap: wrap; gap: 12px 28px; color: var(--muted); font-size: 13px; }
        .hero-points b { color: var(--white); font-size: 20px; margin-right: 5px; }

        .section { padding: 104px 0; }
        .section.alt { background: #0b1d33; }
        .section-head { display: flex; align-items: end; justify-content: space-between; gap: 30px; margin-bottom: 36px; }
        .section-head h2 { margin: 10px 0 0; font-size: clamp(28px, 4vw, 44px); }
        .section-intro { max-width: 560px; margin: 0; color: var(--muted); }
        .text-link { color: var(--cyan); font-weight: 700; font-size: 14px; white-space: nowrap; }
        .text-link:hover { color: var(--white); }

        .calendar {
            display: grid;
            grid-template-columns: 1.2fr .8fr;
            gap: 18px;
        }
        .calendar-main, .calendar-side, .glass-card {
            border: 1px solid var(--line);
            border-radius: var(--radius);
            background: var(--panel);
            box-shadow: var(--shadow);
            backdrop-filter: blur(14px);
        }
        .calendar-main { padding: 28px; }
        .date-strip { display: grid; grid-template-columns: repeat(5, 1fr); gap: 9px; margin-bottom: 26px; }
        .date-item { padding: 11px 8px; text-align: center; border: 1px solid var(--line); border-radius: 10px; color: var(--muted); font-size: 12px; }
        .date-item strong { display: block; color: var(--white); font-size: 18px; line-height: 1.3; }
        .date-item.active { color: var(--ink); background: var(--cyan); border-color: var(--cyan); }
        .date-item.active strong { color: var(--ink); }
        .update-list { display: grid; gap: 0; }
        .update-item { display: grid; grid-template-columns: 78px 1fr auto; gap: 16px; align-items: center; padding: 17px 0; border-top: 1px solid var(--line); }
        .update-time { color: var(--orange); font-size: 13px; }
        .update-item h3 { margin: 0 0 4px; font-size: 16px; }
        .update-item p { margin: 0; color: var(--muted); font-size: 13px; }
        .tag { display: inline-flex; padding: 4px 9px; color: var(--cyan); border: 1px solid rgba(82,226,211,.32); border-radius: 99px; font-size: 11px; white-space: nowrap; }
        .calendar-side { padding: 28px; display: flex; flex-direction: column; justify-content: space-between; background: linear-gradient(145deg, rgba(22,61,91,.72), rgba(13,31,53,.72)); }
        .calendar-side h3 { margin: 0 0 10px; font-size: 24px; }
        .calendar-side p { color: var(--muted); font-size: 14px; }
        .signal { margin-top: 35px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--blue-light); font-size: 13px; }

        .topic-grid { display: grid; grid-template-columns: 1.25fr .75fr .75fr; gap: 16px; }
        .topic-card { min-height: 245px; position: relative; overflow: hidden; padding: 25px; border-radius: var(--radius); border: 1px solid var(--line); background-size: cover; background-position: center; transition: var(--ease); }
        .topic-card:first-child { min-height: 355px; }
        .topic-card:before { content: ""; position: absolute; inset: 0; background: linear-gradient(0deg, rgba(5,14,26,.95), rgba(5,14,26,.12)); }
        .topic-card > * { position: relative; z-index: 1; }
        .topic-card:hover { transform: translateY(-5px); border-color: var(--line-bright); }
        .topic-card h3 { position: absolute; left: 25px; bottom: 50px; margin: 0; font-size: 23px; }
        .topic-card p { position: absolute; left: 25px; right: 20px; bottom: 19px; margin: 0; color: #b9cada; font-size: 13px; }
        .topic-label { color: var(--orange); font-size: 12px; }

        .dashboard { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; }
        .metric { padding: 27px; border-left: 3px solid var(--blue); background: #102946; border-radius: 0 var(--radius-sm) var(--radius-sm) 0; }
        .metric:nth-child(2) { border-color: var(--cyan); }
        .metric:nth-child(3) { border-color: var(--orange); }
        .metric small { color: var(--muted); }
        .metric strong { display: block; margin: 10px 0 4px; font-size: 38px; line-height: 1; }
        .metric span { color: var(--cyan); font-size: 13px; }
        .dashboard-note { grid-column: 1 / -1; margin: 4px 0 0; color: var(--muted); font-size: 14px; }

        .news-layout { display: grid; grid-template-columns: 1.4fr .6fr; gap: 34px; }
        .news-list { display: grid; gap: 0; }
        .news-item { display: flex; justify-content: space-between; gap: 25px; padding: 20px 0; border-top: 1px solid var(--line); }
        .news-item h3 { margin: 0 0 6px; font-size: 17px; }
        .news-item p { margin: 0; color: var(--muted); font-size: 13px; }
        .news-date { color: var(--muted); font-size: 12px; white-space: nowrap; }
        .news-aside { padding: 26px; border: 1px solid var(--line); border-radius: var(--radius); background: #102946; }
        .news-aside h3 { margin-bottom: 17px; }
        .mini-list { display: grid; gap: 14px; }
        .mini-list a { padding-bottom: 13px; border-bottom: 1px solid var(--line); color: #d5e4f2; font-size: 14px; }
        .mini-list a:hover { color: var(--cyan); }

        .guide { display: grid; grid-template-columns: .8fr 1.2fr; gap: 60px; align-items: start; }
        .guide-copy h2 { margin: 10px 0 17px; font-size: clamp(28px, 4vw, 42px); }
        .guide-copy p { color: var(--muted); }
        .steps { display: grid; gap: 13px; counter-reset: guide; }
        .step { counter-increment: guide; display: grid; grid-template-columns: 46px 1fr; gap: 16px; align-items: start; padding: 19px; border: 1px solid var(--line); border-radius: var(--radius-sm); background: rgba(16,41,70,.52); }
        .step:before { content: counter(guide, decimal-leading-zero); display: grid; place-items: center; width: 38px; height: 38px; color: var(--ink); background: var(--cyan); border-radius: 9px; font-size: 12px; font-weight: 800; }
        .step h3 { margin: 1px 0 4px; font-size: 16px; }
        .step p { margin: 0; color: var(--muted); font-size: 13px; }

        .faq-section { background: #09192c; }
        .faq-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 13px; }
        details { border: 1px solid var(--line); border-radius: var(--radius-sm); background: rgba(16,41,70,.55); }
        summary { padding: 19px 22px; cursor: pointer; list-style: none; font-weight: 700; }
        summary::-webkit-details-marker { display: none; }
        summary:after { content: "+"; float: right; color: var(--cyan); font-size: 22px; line-height: 1; }
        details[open] summary:after { content: "−"; }
        details p { margin: 0; padding: 0 22px 20px; color: var(--muted); font-size: 14px; }

        .cta {
            position: relative;
            overflow: hidden;
            padding: 73px 0;
            background: #12365a;
        }
        .cta:after { content: ""; position: absolute; right: -90px; top: -120px; width: 380px; height: 380px; border: 1px solid rgba(82,226,211,.32); transform: rotate(36deg); }
        .cta-inner { position: relative; z-index: 1; display: flex; align-items: center; justify-content: space-between; gap: 30px; }
        .cta h2 { margin: 0 0 10px; font-size: clamp(28px, 4vw, 42px); }
        .cta p { max-width: 620px; margin: 0; color: #c2d5e8; }

        .site-footer { padding: 48px 0 25px; background: #050d18; border-top: 1px solid var(--line); }
        .footer-top { display: flex; justify-content: space-between; gap: 40px; padding-bottom: 35px; }
        .footer-brand p { max-width: 350px; margin: 14px 0 0; color: var(--muted); font-size: 13px; }
        .footer-links { display: flex; gap: 25px; color: var(--muted); font-size: 13px; }
        .footer-links a:hover { color: var(--cyan); }
        .footer-bottom { display: flex; justify-content: space-between; gap: 20px; padding-top: 19px; border-top: 1px solid var(--line); color: #71879e; font-size: 12px; }

        :focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }
        @media (max-width: 1024px) {
            .hero { min-height: 690px; }
            .topic-grid { grid-template-columns: 1fr 1fr; }
            .topic-card:first-child { grid-column: 1 / -1; min-height: 300px; }
            .guide { gap: 35px; }
        }
        @media (max-width: 768px) {
            .container { width: min(var(--max), calc(100% - 34px)); }
            .brand-row { min-height: 62px; }
            .header-note, .channel-row { display: none; }
            .menu-toggle { display: block; }
            .nav-inner { min-height: 62px; }
            .nav-links { display: none; position: absolute; top: 62px; left: 0; right: 0; padding: 12px 17px 17px; flex-direction: column; align-items: stretch; background: rgba(7,17,31,.98); border-bottom: 1px solid var(--line); }
            .site-header.open .nav-links { display: flex; }
            .nav-link { padding: 11px 8px; }
            .nav-link:after { left: 8px; right: auto; width: 28px; }
            .hero { min-height: 680px; }
            .hero-content { padding: 140px 0 75px; }
            .hero h1 { font-size: 43px; }
            .section { padding: 75px 0; }
            .section-head, .cta-inner, .footer-top { display: block; }
            .section-head .text-link { display: inline-block; margin-top: 16px; }
            .calendar, .news-layout, .guide { grid-template-columns: 1fr; }
            .calendar-side { min-height: 230px; }
            .dashboard { grid-template-columns: 1fr; }
            .dashboard-note { grid-column: auto; }
            .cta .btn { margin-top: 24px; }
            .footer-links { margin-top: 25px; flex-wrap: wrap; }
            .footer-bottom { display: block; }
            .footer-bottom span { display: block; margin-top: 7px; }
        }
        @media (max-width: 520px) {
            .brand { font-size: 16px; }
            .brand-mark { width: 25px; height: 25px; }
            .brand-mark:after { left: 7px; top: 7px; width: 7px; height: 7px; }
            .hero h1 { font-size: 37px; }
            .hero-lead { font-size: 16px; }
            .hero-actions { align-items: stretch; flex-direction: column; }
            .hero-actions .btn { width: 100%; }
            .hero-actions .play-button { align-self: flex-start; }
            .date-strip { gap: 5px; }
            .date-item { padding: 8px 3px; font-size: 10px; }
            .date-item strong { font-size: 16px; }
            .calendar-main, .calendar-side { padding: 20px; }
            .update-item { grid-template-columns: 1fr auto; gap: 5px 13px; }
            .update-time { grid-column: 1 / -1; }
            .topic-grid, .faq-grid { grid-template-columns: 1fr; }
            .topic-card:first-child { grid-column: auto; min-height: 250px; }
            .topic-card { min-height: 210px; }
            .news-item { display: block; }
            .news-date { display: block; margin-top: 7px; }
            .metric strong { font-size: 32px; }
        }