.feature-card-icon.subway-icon {
        background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    }
    .feature-card-btn.dt-btn {
        background: linear-gradient(135deg, #2563eb 0%, #7c3aed 100%);
    }

    /* ===== 搜索框增强 ===== */
    #dt-city {
        transition: all 0.25s ease;
    }
    #dt-city:focus {
        box-shadow: 0 0 0 4px rgba(37,99,235,0.12);
        border-color: rgba(37,99,235,0.35);
    }

    /* ===== 热门城市 ===== */
    .dt-hot {
        display: flex;
        align-items: center;
        flex-wrap: wrap;
        gap: 8px;
        margin-top: 12px;
    }
    .dt-hot-label {
        font-size: 0.72rem;
        font-weight: 700;
        color: #64748b;
        background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(59,130,246,0.08));
        padding: 4px 12px;
        border-radius: 999px;
        border: 1px solid rgba(99,102,241,0.1);
    }
    .dt-hot-label i {
        color: #f59e0b;
        margin-right: 4px;
    }
    .dt-hot-item {
        border: 1px solid rgba(37,99,235,0.15);
        background: rgba(255,255,255,0.75);
        backdrop-filter: blur(6px);
        color: #334155;
        font-size: 0.78rem;
        font-weight: 600;
        padding: 4px 14px;
        border-radius: 999px;
        cursor: pointer;
        transition: all 0.25s cubic-bezier(0.4,0,0.2,1);
        box-shadow: 0 1px 3px rgba(15,23,42,0.04);
    }
    .dt-hot-item:hover {
        background: linear-gradient(135deg, #2563eb, #7c3aed);
        color: #fff;
        border-color: transparent;
        box-shadow: 0 6px 16px rgba(37,99,235,0.3);
        transform: translateY(-2px) scale(1.02);
    }
    .dt-hot-item:active {
        transform: translateY(0) scale(0.98);
    }

    /* ===== 结果区域容器 ===== */
    #dt-result {
        background: rgba(255,255,255,0.65);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        border-radius: 24px;
        border: 1px solid rgba(255,255,255,0.6);
        box-shadow: 0 12px 40px rgba(15,23,42,0.1), 0 2px 8px rgba(15,23,42,0.04);
        padding: 24px;
        margin-top: 20px;
        animation: dt-resultIn 0.5s cubic-bezier(0.4,0,0.2,1);
    }
    @keyframes dt-resultIn {
        from { opacity: 0; transform: translateY(20px) scale(0.98); }
        to   { opacity: 1; transform: translateY(0) scale(1); }
    }

    /* ===== 城市概览 ===== */
    .dt-overview {
        background: linear-gradient(135deg, #1e293b 0%, #0f172a 40%, #1e1b4b 100%);
        border-radius: 20px;
        padding: 22px 26px;
        margin: 0 0 20px;
        position: relative;
        overflow: hidden;
        box-shadow: 0 8px 32px rgba(15,23,42,0.25);
    }
    .dt-overview::before {
        content: '';
        position: absolute;
        top: -50px; right: -50px;
        width: 200px; height: 200px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(99,102,241,0.2) 0%, transparent 70%);
        pointer-events: none;
    }
    .dt-overview::after {
        content: '';
        position: absolute;
        bottom: -30px; left: -30px;
        width: 140px; height: 140px;
        border-radius: 50%;
        background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, transparent 70%);
        pointer-events: none;
    }
    .dt-overview-left {
        display: flex;
        align-items: center;
        gap: 18px;
        position: relative;
        z-index: 1;
    }
    .dt-overview-badge {
        flex-shrink: 0;
        width: 58px; height: 58px;
        border-radius: 18px;
        background: linear-gradient(135deg, #2563eb, #7c3aed);
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.6rem;
        color: #fff;
        box-shadow: 0 8px 24px rgba(37,99,235,0.4);
        position: relative;
    }
    .dt-overview-badge::after {
        content: '';
        position: absolute;
        inset: -3px;
        border-radius: 20px;
        background: linear-gradient(135deg, rgba(37,99,235,0.3), rgba(124,58,237,0.3));
        z-index: -1;
        filter: blur(6px);
    }
    .dt-overview-info {
        flex: 1;
        min-width: 0;
    }
    .dt-overview-city {
        font-size: 1.5rem;
        font-weight: 800;
        color: #fff;
        letter-spacing: 1.5px;
        text-shadow: 0 2px 10px rgba(0,0,0,0.3);
    }
    .dt-overview-meta {
        display: flex;
        align-items: center;
        gap: 10px;
        margin-top: 6px;
    }
    .dt-overview-stat {
        font-size: 0.82rem;
        color: rgba(255,255,255,0.6);
        font-weight: 500;
    }
    .dt-overview-stat b {
        color: #fff;
        font-size: 1.05rem;
        font-weight: 700;
    }
    .dt-overview-divider {
        width: 5px; height: 5px;
        border-radius: 50%;
        background: rgba(255,255,255,0.25);
    }

    /* ===== 线路图 ===== */
    .dt-map-wrap {
        background: rgba(255,255,255,0.8);
        backdrop-filter: blur(8px);
        border: 1px solid rgba(124,58,237,0.1);
        border-radius: 18px;
        margin-bottom: 20px;
        overflow: hidden;
        box-shadow: 0 4px 16px rgba(15,23,42,0.06);
        transition: box-shadow 0.3s;
    }
    .dt-map-wrap:hover {
        box-shadow: 0 8px 24px rgba(15,23,42,0.1);
    }
    .dt-map-header {
        display: flex;
        align-items: center;
        justify-content: space-between;
        padding: 14px 18px;
        background: linear-gradient(90deg, rgba(99,102,241,0.06), rgba(59,130,246,0.06));
        border-bottom: 1px solid rgba(124,58,237,0.08);
    }
    .dt-map-title {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.9rem;
        font-weight: 700;
        color: #1e293b;
    }
    .dt-map-icon {
        width: 32px; height: 32px;
        border-radius: 10px;
        background: linear-gradient(135deg, #6366f1, #3b82f6);
        display: flex;
        align-items: center;
        justify-content: center;
        color: #fff;
        font-size: 0.85rem;
        box-shadow: 0 4px 12px rgba(99,102,241,0.3);
    }
    .dt-map-toggle {
        display: flex;
        align-items: center;
        gap: 6px;
        border: none;
        background: rgba(37,99,235,0.08);
        color: #2563eb;
        font-size: 0.8rem;
        font-weight: 600;
        cursor: pointer;
        padding: 6px 14px;
        border-radius: 10px;
        transition: all 0.2s;
    }
    .dt-map-toggle:hover {
        background: rgba(37,99,235,0.15);
        transform: translateY(-1px);
    }
    .dt-map-toggle i {
        transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
        font-size: 0.72rem;
    }
    .dt-map-wrap.dt-collapsed .dt-map-toggle i {
        transform: rotate(180deg);
    }
    .dt-map-body {
        padding: 16px;
        max-height: 520px;
        overflow-y: auto;
        transition: all 0.35s;
    }
    .dt-map-wrap.dt-collapsed .dt-map-body {
        display: none;
    }
    .dt-map-body img {
        display: block;
        width: 100%;
        height: auto;
        border-radius: 12px;
        cursor: zoom-in;
        transition: transform 0.35s cubic-bezier(0.4,0,0.2,1);
        box-shadow: 0 4px 16px rgba(15,23,42,0.08);
    }
    .dt-map-body img:hover {
        transform: scale(1.015);
    }

    /* ===== 线路列表 ===== */
    .dt-section-header {
        display: flex;
        align-items: center;
        margin-bottom: 14px;
        padding: 0 4px;
    }
    .dt-section-title {
        display: flex;
        align-items: center;
        gap: 10px;
        font-size: 0.95rem;
        font-weight: 700;
        color: #1e293b;
    }
    .dt-section-title > i {
        color: #6366f1;
        font-size: 0.9rem;
    }
    .dt-lines-count {
        font-size: 0.74rem;
        font-weight: 600;
        color: #64748b;
        background: linear-gradient(135deg, rgba(99,102,241,0.1), rgba(59,130,246,0.08));
        padding: 3px 12px;
        border-radius: 999px;
        margin-left: 4px;
        border: 1px solid rgba(99,102,241,0.1);
    }
    .dt-lines {
        display: flex;
        flex-direction: column;
        gap: 14px;
        padding: 4px 6px 14px 4px;
    }
    .dt-lines::-webkit-scrollbar { width: 5px; }
    .dt-lines::-webkit-scrollbar-thumb { background: linear-gradient(180deg, rgba(99,102,241,0.3), rgba(59,130,246,0.3)); border-radius: 3px; }
    .dt-lines::-webkit-scrollbar-track { background: transparent; }

    /* ===== 线路卡片 ===== */
    .dt-line-card {
        background: rgba(255,255,255,0.85);
        backdrop-filter: blur(6px);
        border: 1px solid rgba(148,163,184,0.14);
        border-radius: 18px;
        overflow: hidden;
        transition: all 0.3s cubic-bezier(0.4,0,0.2,1);
        box-shadow: 0 2px 8px rgba(15,23,42,0.04), 0 1px 2px rgba(15,23,42,0.03);
        position: relative;
        opacity: 0;
        animation: dt-cardSlideIn 0.4s cubic-bezier(0.4,0,0.2,1) forwards;
    }
    @keyframes dt-cardSlideIn {
        from { opacity: 0; transform: translateY(16px); }
        to   { opacity: 1; transform: translateY(0); }
    }
    /* 左侧彩色色条 - 渐变 */
    .dt-line-card::before {
        content: '';
        position: absolute;
        left: 0; top: 0; bottom: 0;
        width: 5px;
        background: linear-gradient(180deg, var(--dt-line-color, #6366f1), var(--dt-line-color, #6366f1));
        opacity: 0.85;
        transition: all 0.3s ease;
        border-radius: 0 3px 3px 0;
    }
    .dt-line-card:hover {
        box-shadow: 0 12px 32px rgba(15,23,42,0.12);
        transform: translateY(-2px);
        border-color: rgba(148,163,184,0.25);
    }
    .dt-line-card:hover::before { width: 7px; opacity: 1; }
    .dt-line-card.dt-open {
        border-color: rgba(99,102,241,0.25);
        box-shadow: 0 8px 28px rgba(99,102,241,0.12);
    }
    .dt-line-card.dt-open::before { width: 7px; opacity: 1; }

    .dt-line-head {
        display: flex;
        align-items: center;
        gap: 14px;
        padding: 16px 20px 16px 26px;
        cursor: pointer;
        user-select: none;
        transition: background 0.2s;
    }
    .dt-line-head:hover {
        background: rgba(99,102,241,0.035);
    }
    .dt-line-card.dt-open .dt-line-head {
        background: rgba(99,102,241,0.045);
    }

    /* 线路编号徽章 */
    .dt-line-badge {
        flex-shrink: 0;
        width: 46px; height: 46px;
        border-radius: 50%;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 0.95rem;
        font-weight: 800;
        color: #fff;
        box-shadow: 0 4px 14px rgba(0,0,0,0.18);
        position: relative;
        transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
    }
    .dt-line-card:hover .dt-line-badge {
        transform: scale(1.06);
    }

    /* 信息区 */
    .dt-line-info {
        flex: 1;
        min-width: 0;
        display: flex;
        flex-direction: column;
        gap: 5px;
    }
    .dt-line-name {
        font-size: 0.98rem;
        font-weight: 600;
        color: #1e293b;
        line-height: 1.35;
        word-break: break-word;
        display: -webkit-box;
        -webkit-line-clamp: 2;
        line-clamp: 2;
        -webkit-box-orient: vertical;
        overflow: hidden;
        transition: color 0.2s;
    }
    .dt-line-head:hover .dt-line-name {
        color: #4338ca;
    }
    .dt-line-meta {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 0.78rem;
        color: #64748b;
        font-weight: 500;
    }
    .dt-line-meta-dot {
        width: 7px; height: 7px;
        border-radius: 50%;
        background: var(--dt-line-color, #64748b);
        flex-shrink: 0;
    }
    .dt-line-meta-sep {
        width: 4px; height: 4px;
        border-radius: 50%;
        background: #cbd5e1;
        flex-shrink: 0;
    }

    .dt-line-arrow {
        flex-shrink: 0;
        color: #94a3b8;
        font-size: 0.8rem;
        width: 32px; height: 32px;
        border-radius: 50%;
        background: rgba(148,163,184,0.1);
        display: flex;
        align-items: center;
        justify-content: center;
        transition: all 0.35s cubic-bezier(0.4,0,0.2,1);
    }
    .dt-line-card.dt-open .dt-line-arrow {
        transform: rotate(180deg);
        background: linear-gradient(135deg, rgba(99,102,241,0.15), rgba(59,130,246,0.15));
        color: #6366f1;
        box-shadow: 0 2px 8px rgba(99,102,241,0.15);
    }

    /* ===== 站点时间线 - 地铁轨道式 ===== */
    .dt-line-sites {
        display: none;
        padding: 0 20px 20px 26px;
    }
    .dt-line-card.dt-open .dt-line-sites {
        display: block;
        animation: dt-fadeIn 0.35s cubic-bezier(0.4,0,0.2,1);
    }
    @keyframes dt-fadeIn {
        from { opacity: 0; transform: translateY(-8px); }
        to   { opacity: 1; transform: translateY(0); }
    }

    .dt-station-flow {
        display: flex;
        flex-wrap: wrap;
        align-items: center;
        gap: 0;
        padding-top: 4px;
        position: relative;
    }
    .dt-station {
        display: inline-flex;
        align-items: center;
        gap: 6px;
        background: rgba(148,163,184,0.06);
        border: 1px solid rgba(148,163,184,0.18);
        border-radius: 999px;
        padding: 6px 14px;
        font-size: 0.82rem;
        color: #334155;
        font-weight: 500;
        transition: all 0.2s cubic-bezier(0.4,0,0.2,1);
        cursor: default;
        position: relative;
        z-index: 2;
    }
    .dt-station:hover {
        border-color: var(--dt-line-color, #6366f1);
        background: rgba(99,102,241,0.07);
        transform: translateY(-2px);
        box-shadow: 0 4px 12px rgba(99,102,241,0.12);
    }
    .dt-station .dt-st-dot {
        width: 8px; height: 8px;
        border-radius: 50%;
        background: #94a3b8;
        flex-shrink: 0;
        transition: all 0.2s;
    }
    .dt-station:hover .dt-st-dot {
        background: var(--dt-line-color, #6366f1);
        box-shadow: 0 0 6px var(--dt-line-color, #6366f1);
    }
    /* 首站绿色 / 末站红色 */
    .dt-station.dt-first {
        background: linear-gradient(135deg, rgba(34,197,94,0.1), rgba(34,197,94,0.06));
        border-color: rgba(34,197,94,0.4);
        color: #15803d;
        font-weight: 600;
    }
    .dt-station.dt-first .dt-st-dot { background: #22c55e; box-shadow: 0 0 6px rgba(34,197,94,0.4); }
    .dt-station.dt-last {
        background: linear-gradient(135deg, rgba(239,68,68,0.1), rgba(239,68,68,0.06));
        border-color: rgba(239,68,68,0.4);
        color: #b91c1c;
        font-weight: 600;
    }
    .dt-station.dt-last .dt-st-dot { background: #ef4444; box-shadow: 0 0 6px rgba(239,68,68,0.4); }

    /* 轨道连接线 */
    .dt-st-sep {
        flex: 1;
        min-width: 10px;
        max-width: 24px;
        height: 2px;
        background: linear-gradient(90deg, rgba(148,163,184,0.3), rgba(148,163,184,0.15));
        position: relative;
        margin: 0 2px;
        flex-shrink: 0;
    }
    .dt-st-sep::after {
        content: '';
        position: absolute;
        right: -2px;
        top: 50%;
        transform: translateY(-50%);
        width: 5px;
        height: 5px;
        border-radius: 50%;
        background: rgba(148,163,184,0.4);
    }

    /* ===== 响应式 ===== */
    @media (max-width: 640px) {
        #dt-result { padding: 16px; border-radius: 18px; }
        .dt-overview { padding: 16px 18px; border-radius: 16px; }
        .dt-overview-badge { width: 48px; height: 48px; font-size: 1.3rem; border-radius: 14px; }
        .dt-overview-city { font-size: 1.2rem; }
        .dt-overview-meta { gap: 8px; flex-wrap: wrap; }
        .dt-map-body { padding: 12px; max-height: 380px; }
        .dt-line-badge { width: 38px; height: 38px; font-size: 0.8rem; }
        .dt-line-head { padding: 14px 16px 14px 20px; gap: 12px; }
        .dt-line-name { font-size: 0.88rem; }
        .dt-line-meta { font-size: 0.72rem; }
        .dt-station { font-size: 0.76rem; padding: 5px 12px; }
        .dt-line-sites { padding: 0 14px 14px 20px; }
    }