/*
 * OpenRouter 免费模型中心
 * 企业级明亮商务视觉：深海军蓝、科技蓝、极简留白与精致数据卡片
 */

:root {
    --navy-950: #071b35;
    --navy-900: #0b284c;
    --navy-800: #123b6d;
    --blue-700: #075ec9;
    --blue-600: #0874e8;
    --blue-100: #e9f3ff;
    --blue-50: #f4f9ff;
    --ink-950: #10233c;
    --ink-800: #263b56;
    --ink-600: #52677f;
    --ink-500: #6d8095;
    --line: #dce6f0;
    --line-strong: #cad9e8;
    --surface: #ffffff;
    --surface-soft: #f6f9fc;
    --success: #087d58;
    --success-bg: #e8f7f0;
    --gold: #b47911;
    --gold-bg: #fff6df;
    --danger: #b42336;
    --danger-bg: #fff0f2;
    --shadow-sm: 0 2px 6px rgba(15, 45, 78, 0.05);
    --shadow-md: 0 12px 30px rgba(15, 45, 78, 0.08);
    --shadow-lg: 0 24px 64px rgba(7, 27, 53, 0.14);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 20px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    min-width: 320px;
    color: var(--ink-800);
    background: var(--surface-soft);
    font-family: Inter, "PingFang SC", "Microsoft YaHei", "Noto Sans SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    font-size: 16px;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
}

.container {
    width: min(1240px, calc(100% - 48px));
    margin: 0 auto;
}

/* 顶部品牌区 */
.header {
    position: relative;
    overflow: hidden;
    min-height: 342px;
    padding: 68px 0 62px;
    color: #fff;
    background:
        radial-gradient(circle at 83% 10%, rgba(52, 160, 255, 0.38), transparent 27%),
        radial-gradient(circle at 64% 105%, rgba(0, 212, 180, 0.16), transparent 35%),
        linear-gradient(121deg, var(--navy-950) 0%, var(--navy-900) 52%, #10477c 100%);
}

.header::before,
.header::after {
    position: absolute;
    content: "";
    pointer-events: none;
}

.header::before {
    top: -215px;
    right: 6%;
    width: 510px;
    height: 510px;
    border: 1px solid rgba(255, 255, 255, 0.14);
    border-radius: 50%;
    box-shadow: 0 0 0 68px rgba(255, 255, 255, 0.035), 0 0 0 136px rgba(255, 255, 255, 0.025);
}

.header::after {
    right: 0;
    bottom: 0;
    left: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, rgba(154, 211, 255, 0.75), transparent);
}

.header .container {
    position: relative;
    z-index: 1;
}

.header h1 {
    max-width: 820px;
    margin-bottom: 12px;
    color: #fff;
    font-size: clamp(2.05rem, 4vw, 3.55rem);
    font-weight: 750;
    letter-spacing: -0.045em;
    line-height: 1.13;
}

.header h1::before {
    display: block;
    width: fit-content;
    margin: 0 0 17px;
    padding: 5px 11px;
    border: 1px solid rgba(162, 215, 255, 0.52);
    border-radius: 999px;
    color: #c7e8ff;
    content: "OPENROUTER INTELLIGENCE DIRECTORY";
    font-family: Arial, sans-serif;
    font-size: 0.64rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}

.subtitle {
    max-width: 660px;
    color: #c9daea;
    font-size: 1.08rem;
    letter-spacing: 0.005em;
}

.header-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1px;
    width: fit-content;
    min-width: min(100%, 610px);
    margin-top: 37px;
    overflow: hidden;
    border: 1px solid rgba(201, 226, 247, 0.23);
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.14);
    box-shadow: 0 16px 34px rgba(0, 0, 0, 0.12);
    backdrop-filter: blur(9px);
}

.stat {
    min-width: 144px;
    padding: 13px 21px 14px;
    background: rgba(5, 26, 52, 0.33);
}

.stat-value {
    display: block;
    color: #fff;
    font-family: Georgia, "Times New Roman", serif;
    font-size: 1.22rem;
    font-weight: 700;
    line-height: 1.25;
}

.stat-label {
    display: block;
    margin-top: 3px;
    color: #afc8de;
    font-size: 0.76rem;
    font-weight: 500;
}

/* 导航 */
.nav {
    position: sticky;
    top: 0;
    z-index: 20;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 4px 16px rgba(19, 48, 78, 0.045);
    backdrop-filter: blur(14px);
}

.nav .container {
    display: flex;
    gap: 34px;
}

.nav a {
    position: relative;
    display: inline-flex;
    align-items: center;
    min-height: 58px;
    color: var(--ink-600);
    text-decoration: none;
    font-size: 0.92rem;
    font-weight: 650;
    transition: color 0.2s ease;
}

.nav a::after {
    position: absolute;
    right: 0;
    bottom: 0;
    left: 0;
    height: 3px;
    border-radius: 2px 2px 0 0;
    background: transparent;
    content: "";
    transition: background 0.2s ease;
}

.nav a:hover,
.nav a.active {
    color: var(--blue-700);
}

.nav a:hover::after,
.nav a.active::after {
    background: var(--blue-600);
}

/* 主内容 */
main.container {
    padding-bottom: 36px;
}

section {
    padding: 56px 0;
    border-bottom: 1px solid var(--line);
}

section h2 {
    position: relative;
    margin-bottom: 26px;
    padding-left: 16px;
    color: var(--ink-950);
    font-size: clamp(1.5rem, 2.4vw, 2rem);
    font-weight: 750;
    letter-spacing: -0.025em;
    line-height: 1.25;
}

section h2::before {
    position: absolute;
    top: 0.12em;
    bottom: 0.12em;
    left: 0;
    width: 4px;
    border-radius: 4px;
    background: linear-gradient(180deg, #30a4ff, var(--blue-700));
    content: "";
}

/* 筛选器 */
.filter-bar {
    display: flex;
    gap: 12px;
    margin-bottom: 25px;
}

.filter-bar input,
.filter-bar select {
    height: 48px;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius-sm);
    outline: none;
    color: var(--ink-800);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    font: inherit;
    font-size: 0.92rem;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.filter-bar input {
    flex: 1;
    min-width: 240px;
    padding: 0 17px;
}

.filter-bar select {
    min-width: 175px;
    padding: 0 38px 0 14px;
    cursor: pointer;
}

.filter-bar input::placeholder {
    color: #95a6b8;
}

.filter-bar input:focus,
.filter-bar select:focus {
    border-color: var(--blue-600);
    box-shadow: 0 0 0 4px rgba(8, 116, 232, 0.13);
}

/* 模型卡片 */
.model-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
}

.model-card {
    display: flex;
    min-height: 250px;
    flex-direction: column;
    padding: 23px;
    overflow: hidden;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

.model-card:hover {
    border-color: #a9cdf0;
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.model-card-header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 10px;
    margin-bottom: 15px;
}

.model-id {
    max-width: calc(100% - 52px);
    overflow: hidden;
    color: var(--blue-700);
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
    font-size: 0.73rem;
    font-weight: 600;
    letter-spacing: -0.015em;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.model-name {
    margin-bottom: 12px;
    color: var(--ink-950);
    font-size: 1.08rem;
    font-weight: 720;
    letter-spacing: -0.015em;
    line-height: 1.35;
}

.model-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 7px;
    margin-bottom: 14px;
}

.tag {
    display: inline-flex;
    align-items: center;
    max-width: 100%;
    min-height: 24px;
    padding: 3px 8px;
    overflow: hidden;
    border: 1px solid #e1e9f1;
    border-radius: 5px;
    color: var(--ink-600);
    background: #f6f8fa;
    font-size: 0.7rem;
    font-weight: 650;
    line-height: 1.2;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.tag.free {
    border-color: #bde9d7;
    color: var(--success);
    background: var(--success-bg);
}

.tag.company {
    border-color: #f1dca8;
    color: var(--gold);
    background: var(--gold-bg);
}

.model-desc {
    display: -webkit-box;
    margin-bottom: 16px;
    overflow: hidden;
    color: var(--ink-600);
    font-size: 0.84rem;
    line-height: 1.65;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 3;
}

.model-footer {
    display: flex;
    justify-content: space-between;
    gap: 8px;
    margin-top: auto;
    padding-top: 13px;
    border-top: 1px solid #e7edf4;
    color: var(--ink-500);
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 0.69rem;
}

/* 场景推荐 */
.scenario-tabs {
    display: flex;
    flex-wrap: wrap;
    gap: 9px;
    margin-bottom: 20px;
}

.tab {
    min-height: 39px;
    padding: 8px 15px;
    border: 1px solid var(--line-strong);
    border-radius: 7px;
    color: var(--ink-600);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
    cursor: pointer;
    font: inherit;
    font-size: 0.86rem;
    font-weight: 650;
    transition: all 0.2s ease;
}

.tab:hover {
    border-color: #91bde9;
    color: var(--blue-700);
    background: var(--blue-50);
}

.tab.active {
    border-color: var(--blue-700);
    color: #fff;
    background: linear-gradient(135deg, var(--blue-700), var(--blue-600));
    box-shadow: 0 6px 15px rgba(7, 94, 201, 0.22);
}

.scenario-card {
    position: relative;
    overflow: hidden;
    padding: 34px;
    border: 1px solid #c9ddf0;
    border-radius: var(--radius-md);
    background: linear-gradient(113deg, #fff 0%, #f0f7ff 100%);
    box-shadow: var(--shadow-md);
}

.scenario-card::after {
    position: absolute;
    top: -74px;
    right: -48px;
    width: 230px;
    height: 230px;
    border: 1px solid rgba(8, 116, 232, 0.15);
    border-radius: 50%;
    box-shadow: 0 0 0 35px rgba(8, 116, 232, 0.04);
    content: "";
}

.scenario-topline,
.scenario-summary,
.scenario-detail-grid,
.scenario-tools,
.scenario-card .scenario-availability {
    position: relative;
    z-index: 1;
}

.scenario-topline {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 24px;
    margin-bottom: 18px;
}

.scenario-eyebrow {
    margin-bottom: 4px;
    color: var(--blue-700);
    font-size: 0.72rem;
    font-weight: 750;
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.scenario-card h3 {
    color: var(--ink-950);
    font-size: 1.45rem;
    font-weight: 730;
    letter-spacing: -0.02em;
    line-height: 1.3;
}

.recommended-model {
    display: inline-block;
    max-width: 53%;
    padding: 7px 10px;
    overflow: hidden;
    border: 1px solid #b8d8fa;
    border-radius: 6px;
    color: var(--blue-700);
    background: #fff;
    font-family: "SFMono-Regular", Consolas, monospace;
    font-size: 0.78rem;
    font-weight: 650;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.scenario-summary {
    max-width: 920px;
    margin-bottom: 25px;
    color: var(--ink-600);
    font-size: 0.97rem;
}

.scenario-detail-grid {
    display: grid;
    grid-template-columns: 1.05fr 0.95fr;
    gap: 18px;
}

.scenario-card section {
    min-width: 0;
    padding: 21px;
    border: 1px solid #d9e6f2;
    border-radius: 10px;
    background: rgba(255, 255, 255, 0.77);
}

.scenario-card section h4,
.scenario-tools h4 {
    margin-bottom: 13px;
    color: var(--ink-950);
    font-size: 0.82rem;
    font-weight: 750;
    letter-spacing: 0.035em;
}

.scenario-steps ol {
    display: grid;
    gap: 11px;
    list-style: none;
}

.scenario-steps li {
    display: grid;
    grid-template-columns: 21px 1fr;
    gap: 9px;
    color: var(--ink-600);
    font-size: 0.85rem;
    line-height: 1.55;
}

.scenario-steps li span {
    display: inline-grid;
    width: 20px;
    height: 20px;
    place-items: center;
    border-radius: 50%;
    color: #fff;
    background: var(--blue-700);
    font-size: 0.68rem;
    font-weight: 700;
}

.scenario-example blockquote {
    margin: 0;
    padding: 14px 15px;
    border-left: 3px solid #62aaf0;
    color: var(--ink-600);
    background: var(--blue-50);
    font-size: 0.85rem;
    font-style: normal;
    line-height: 1.65;
}

.scenario-tools {
    margin-top: 18px;
    padding: 18px 20px;
    border-radius: 10px;
    background: rgba(6, 65, 126, 0.055);
}

.scenario-tools p {
    color: var(--ink-600);
    font-size: 0.87rem;
    line-height: 1.7;
}

.scenario-card .scenario-availability {
    margin-top: 15px;
    color: var(--gold);
    font-size: 0.82rem;
    font-weight: 600;
}

/* 关于与页脚 */
.about-content {
    padding: 27px 30px;
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    background: var(--surface);
    box-shadow: var(--shadow-sm);
}

.about-content p {
    margin-bottom: 10px;
    color: var(--ink-600);
}

.about-content p:last-child {
    margin-bottom: 0;
}

.about-content strong {
    color: var(--ink-800);
}

.about-content a {
    color: var(--blue-700);
    font-weight: 650;
    text-decoration: none;
}

.about-content a:hover {
    text-decoration: underline;
    text-underline-offset: 3px;
}

.footer {
    padding: 30px 0;
    color: #b6c6d7;
    background: var(--navy-950);
    font-size: 0.88rem;
    text-align: center;
}

.error-message {
    grid-column: 1 / -1;
    padding: 16px 18px;
    border: 1px solid #f1b9c0;
    border-radius: var(--radius-sm);
    color: var(--danger);
    background: var(--danger-bg);
}

@media (max-width: 1040px) {
    .model-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 700px) {
    .container {
        width: min(100% - 32px, 1240px);
    }

    .header {
        min-height: 310px;
        padding: 46px 0 44px;
    }

    .header h1 {
        font-size: 2.1rem;
    }

    .header h1::before {
        margin-bottom: 13px;
        font-size: 0.55rem;
    }

    .subtitle {
        font-size: 0.97rem;
    }

    .header-stats {
        width: 100%;
        margin-top: 28px;
    }

    .stat {
        min-width: 50%;
        flex: 1;
        padding: 11px 13px;
    }

    .stat:last-child {
        width: 100%;
    }

    .nav .container {
        gap: 22px;
        overflow-x: auto;
    }

    .nav a {
        min-height: 52px;
        flex: 0 0 auto;
        font-size: 0.86rem;
    }

    section {
        padding: 38px 0;
    }

    .filter-bar {
        flex-direction: column;
    }

    .filter-bar input,
    .filter-bar select {
        width: 100%;
    }

    .model-grid {
        grid-template-columns: 1fr;
        gap: 14px;
    }

    .model-card {
        min-height: 0;
        padding: 19px;
    }

    .scenario-card {
        padding: 24px 21px;
    }

    .scenario-topline {
        flex-direction: column;
        gap: 13px;
    }

    .recommended-model {
        max-width: 100%;
    }

    .scenario-detail-grid {
        grid-template-columns: 1fr;
        gap: 12px;
    }

    .scenario-card section,
    .scenario-tools {
        padding: 17px;
    }

    .about-content {
        padding: 22px 20px;
    }
}