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

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

        body {
            font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
            background-color: #000;
            min-height: 100vh;
            min-height: 100dvh;
        }

        body.locked {
            overflow: hidden;
            height: 100vh;
            height: 100dvh;
        }

        /* ========== 封面 ========== */
        .cover {
            position: fixed;
            inset: 0;
            z-index: 1000;
            background: #000;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            will-change: transform, opacity;
            touch-action: none;
            user-select: none;
            -webkit-user-select: none;
        }

        .cover.anim {
            transition: transform 0.55s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.45s ease;
        }

        .cover.leaving {
            transform: translateY(-110%) !important;
            opacity: 0;
            pointer-events: none;
        }

        .cover-brand {
            position: absolute;
            top: max(28px, env(safe-area-inset-top));
            left: 0;
            right: 0;
            text-align: center;
            z-index: 2;
            color: #fff;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.5);
            pointer-events: none;
        }

        .cover-brand strong {
            display: block;
            font-size: clamp(1.4rem, 6vw, 1.8rem);
            letter-spacing: 0.12em;
        }

        .cover-brand small {
            display: block;
            margin-top: 6px;
            font-size: 13px;
            opacity: 0.85;
            letter-spacing: 0.06em;
        }

        .cover-frame {
            position: absolute;
            inset: 0;
            z-index: 0;
            overflow: hidden;
            background: #000;
        }

        .cover-img {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            object-position: center center;
            display: block;
        }

        @media (max-width: 768px) {
            .cover-img {
                object-fit: cover;
                object-position: center center;
            }

            .cover-fade {
                height: 28%;
            }
        }

        .cover-fade {
            position: absolute;
            left: 0;
            right: 0;
            bottom: 0;
            height: 36%;
            background: linear-gradient(to top, rgba(11, 15, 20, 0.92), transparent);
            pointer-events: none;
            z-index: 1;
        }

        .cover-hint {
            position: absolute;
            left: 0;
            right: 0;
            bottom: max(28px, env(safe-area-inset-bottom));
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 8px;
            color: #fff;
            text-shadow: 0 2px 8px rgba(0, 0, 0, 0.55);
            pointer-events: none;
            z-index: 2;
        }

        .cover-hint span {
            font-size: 14px;
            letter-spacing: 0.08em;
        }

        .cover-arrow {
            width: 22px;
            height: 22px;
            border-left: 2px solid #fff;
            border-bottom: 2px solid #fff;
            transform: rotate(-45deg);
            animation: bounceUp 1.4s ease-in-out infinite;
        }

        @keyframes bounceUp {
            0%, 100% { transform: rotate(-45deg) translate(0, 0); opacity: 0.5; }
            50% { transform: rotate(-45deg) translate(4px, 4px); opacity: 1; }
        }

        /* ========== 邀请函视频页 ========== */
        .page {
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
            min-height: 100dvh;
            padding: 12px 0 28px;
            background: #000;
            opacity: 0;
            transform: translateY(24px);
            transition: opacity 0.45s ease, transform 0.45s ease;
        }

        .page.visible {
            opacity: 1;
            transform: translateY(0);
        }

        .page-back-hint {
            display: none;
            text-align: center;
            color: rgba(255, 255, 255, 0.72);
            font-size: 12px;
            letter-spacing: 0.06em;
            margin: 8px 0 14px;
            line-height: 1.4;
        }

        .page.visible .page-back-hint {
            display: block;
        }

        .page-back-arrow {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-left: 2px solid rgba(255, 255, 255, 0.72);
            border-bottom: 2px solid rgba(255, 255, 255, 0.72);
            transform: rotate(-45deg);
            margin-bottom: 2px;
            animation: bounceDown 1.4s ease-in-out infinite;
        }

        @keyframes bounceDown {
            0%, 100% { transform: rotate(-45deg) translate(0, 0); opacity: 0.45; }
            50% { transform: rotate(-45deg) translate(4px, 4px); opacity: 1; }
        }

        .video-wrap {
            width: 100%;
            max-width: 520px;
            padding: 0 10px;
        }

        .invite-video {
            display: block;
            width: 100%;
            height: auto;
            background: #000;
            border-radius: 12px;
            box-shadow: 0 10px 24px rgba(0, 0, 0, 0.38);
        }

        .music-btn {
            position: fixed;
            left: 16px;
            bottom: calc(16px + env(safe-area-inset-bottom));
            z-index: 900;
            border: none;
            width: 50px;
            height: 50px;
            border-radius: 50%;
            padding: 0;
            display: none;
            background: rgba(0, 0, 0, 0.22);
            backdrop-filter: blur(4px);
            box-shadow: 0 6px 16px rgba(0, 0, 0, 0.28);
            -webkit-tap-highlight-color: transparent;
            touch-action: none;
            align-items: center;
            justify-content: center;
            cursor: grab;
        }

        .music-btn.show { display: inline-flex; }
        .music-btn:active { transform: scale(0.95); }
        .music-btn.dragging { cursor: grabbing; }

        .music-disc {
            position: relative;
            overflow: hidden;
            width: 38px;
            height: 38px;
            border-radius: 50%;
            background:
                radial-gradient(circle at 50% 50%, #0f0f0f 0 4px, #dedede 4px 8px, transparent 8px),
                repeating-radial-gradient(circle at 50% 50%, #111 0 2px, #1d1d1d 2px 4px);
            border: 2px solid #2f2f2f;
            box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.08);
            animation: record-spin 6s linear infinite;
            animation-play-state: paused;
        }

        .music-disc::after {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            width: 6px;
            height: 6px;
            margin-left: -3px;
            margin-top: -3px;
            border-radius: 50%;
            background: #f4f4f4;
        }

        .music-cover {
            position: absolute;
            inset: 0;
            width: 100%;
            height: 100%;
            object-fit: cover;
            border-radius: 50%;
            z-index: 0;
            opacity: 0.92;
        }

        .music-btn.is-playing .music-disc {
            animation-play-state: running;
        }

        .music-arm {
            position: absolute;
            right: -6px;
            top: -8px;
            width: 7px;
            height: 28px;
            background: linear-gradient(to bottom, #d8d8d8, #9a9a9a);
            border-radius: 4px;
            border: 1px solid rgba(0, 0, 0, 0.2);
            transform-origin: 50% 4px;
            transform: rotate(-8deg);
            transition: transform 260ms ease;
            box-shadow: 0 1px 3px rgba(0, 0, 0, 0.25);
            z-index: 3;
            pointer-events: none;
        }

        .music-arm::before {
            content: "";
            position: absolute;
            top: -5px;
            left: 50%;
            width: 10px;
            height: 10px;
            margin-left: -5px;
            border-radius: 50%;
            background: radial-gradient(circle at 35% 35%, #f2f2f2, #7d7d7d);
            border: 1px solid rgba(0, 0, 0, 0.25);
        }

        .music-arm-head {
            position: absolute;
            bottom: -3px;
            left: 50%;
            width: 10px;
            height: 8px;
            margin-left: -5px;
            border-radius: 2px;
            background: linear-gradient(to bottom, #404040, #151515);
            box-shadow: 0 1px 2px rgba(0, 0, 0, 0.4);
        }

        .music-arm-head::after {
            content: "";
            position: absolute;
            left: 50%;
            bottom: -3px;
            width: 2px;
            height: 4px;
            margin-left: -1px;
            background: #0f0f0f;
            border-radius: 1px;
        }

        .music-btn.is-playing .music-arm {
            transform: rotate(28deg);
        }

        .music-note {
            position: absolute;
            font-size: 14px;
            line-height: 1;
            opacity: 0;
            transform: translate(0, 0) scale(0.6);
            pointer-events: none;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.28);
        }

        .note-1 { color: #ff5a5f; left: 8px; bottom: 20px; animation-delay: 0s; }
        .note-2 { color: #ffd166; left: 26px; bottom: 8px; animation-delay: 0.4s; }
        .note-3 { color: #06d6a0; left: 40px; bottom: 18px; animation-delay: 0.8s; }
        .note-4 { color: #118ab2; left: 14px; bottom: 38px; animation-delay: 1.2s; }
        .note-5 { color: #9b5de5; left: 32px; bottom: 34px; animation-delay: 1.6s; }

        .music-btn.is-playing .music-note {
            animation: note-float 2.2s ease-out infinite;
        }

        @keyframes note-float {
            0% {
                opacity: 0;
                transform: translate(0, 0) scale(0.6) rotate(0deg);
            }
            18% {
                opacity: 1;
            }
            70% {
                opacity: 0.95;
            }
            100% {
                opacity: 0;
                transform: translate(14px, -30px) scale(1.1) rotate(12deg);
            }
        }

        @keyframes record-spin {
            from { transform: rotate(0deg); }
            to { transform: rotate(360deg); }
        }

        .page-next-hint {
            display: none;
            text-align: center;
            color: rgba(255, 255, 255, 0.72);
            font-size: 12px;
            letter-spacing: 0.06em;
            margin: 16px 0 8px;
            line-height: 1.4;
        }

        .page.visible .page-next-hint {
            display: block;
        }

        .page-next-arrow {
            display: inline-block;
            width: 12px;
            height: 12px;
            border-left: 2px solid rgba(255, 255, 255, 0.72);
            border-bottom: 2px solid rgba(255, 255, 255, 0.72);
            transform: rotate(135deg);
            margin-top: 2px;
            animation: bounceUp 1.4s ease-in-out infinite;
        }

        /* ========== 静态信息页 ========== */
        .info-page {
            position: relative;
            min-height: 100vh;
            min-height: 100dvh;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: 28px 20px;
            overflow: hidden;
            color: #fff;
        }

        .info-bg {
            position: absolute;
            inset: 0;
            background-size: cover;
            background-position: center;
            transform: scale(1.05);
            filter: saturate(0.92);
        }

        .info-mask {
            position: absolute;
            inset: 0;
            background:
                linear-gradient(180deg, rgba(0, 0, 0, 0.35), rgba(0, 0, 0, 0.72) 55%, rgba(0, 0, 0, 0.88));
        }

        .info-content {
            position: relative;
            z-index: 1;
            width: 100%;
            max-width: 420px;
            text-align: center;
        }

        .info-eyebrow {
            font-size: 13px;
            letter-spacing: 0.28em;
            opacity: 0.82;
            margin-bottom: 14px;
        }

        .info-title {
            font-size: clamp(1.8rem, 7vw, 2.4rem);
            letter-spacing: 0.12em;
            font-weight: 600;
            margin-bottom: 12px;
        }

        .info-line {
            font-size: 14px;
            opacity: 0.78;
            margin-bottom: 28px;
        }

        .info-card {
            text-align: left;
            background: rgba(255, 255, 255, 0.08);
            border: 1px solid rgba(255, 255, 255, 0.14);
            border-radius: 16px;
            padding: 18px 18px 8px;
            backdrop-filter: blur(8px);
            margin-bottom: 28px;
        }

        .info-item {
            display: flex;
            justify-content: space-between;
            gap: 16px;
            padding: 10px 0 12px;
            border-bottom: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 14px;
        }

        .info-item:last-child {
            border-bottom: none;
        }

        .info-item span {
            opacity: 0.68;
            flex-shrink: 0;
        }

        .info-item strong {
            font-weight: 500;
            text-align: right;
        }

        .info-item strong.info-multiline {
            line-height: 1.55;
        }

        .info-map {
            margin-bottom: 28px;
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid rgba(255, 255, 255, 0.14);
            background: rgba(0, 0, 0, 0.28);
        }

        .info-map-frame {
            display: block;
            width: 100%;
            height: 260px;
            border: 0;
            background: #1a1f24;
        }

        .info-map .leaflet-container {
            width: 100%;
            height: 260px;
            background: #1a1f24;
            font: inherit;
        }

        .info-map-tip {
            margin: 0;
            padding: 8px 12px 10px;
            color: rgba(255, 255, 255, 0.72);
            font-size: 12px;
            text-align: center;
        }

        .info-back {
            display: inline-block;
            color: #fff;
            text-decoration: none;
            font-size: 13px;
            letter-spacing: 0.12em;
            padding: 10px 18px;
            border: 1px solid rgba(255, 255, 255, 0.35);
            border-radius: 999px;
        }

        @media (max-width: 480px) {
            .page { padding: 8px 0 24px; }
            .page-back-hint,
            .page-next-hint { font-size: 11px; }
            .info-page { padding: 24px 16px; }
        }