/* ============================================================
   成都市双流区英朋网络技术工作室 · 全新 UI 设计
   风格：现代商务 · 浅色基调 · 蓝青主色
   ============================================================ */

/* ---------- 设计令牌 ---------- */
:root {
    --bg: #ffffff;
    --bg-soft: #f5f8fd;
    --bg-soft-2: #eef3fb;
    --surface: #ffffff;

    --text: #16203a;
    --text-2: #515c75;
    --text-3: #8b95ab;

    --primary: #2d6bff;
    --primary-dark: #1c4fd6;
    --primary-soft: #e8f0ff;
    --accent: #06b6d4;
    --accent-2: #7c5cff;

    --grad: linear-gradient(120deg, #2d6bff 0%, #06b6d4 100%);
    --grad-2: linear-gradient(120deg, #7c5cff 0%, #2d6bff 100%);

    --border: #e7ecf5;
    --border-soft: #eef2f8;

    --shadow-sm: 0 2px 10px rgba(22, 45, 90, .06);
    --shadow-md: 0 14px 34px rgba(22, 45, 90, .10);
    --shadow-lg: 0 28px 64px rgba(22, 45, 90, .14);

    --radius-sm: 12px;
    --radius: 18px;
    --radius-lg: 26px;

    --container: 1180px;
    --section-y: 104px;

    --ease: cubic-bezier(.4, 0, .2, 1);
    --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei",
            "Helvetica Neue", Arial, sans-serif;
}

/* ---------- Reset ---------- */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 86px; -webkit-text-size-adjust: 100%; }
body {
    font-family: var(--font);
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    font-size: 16px;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }

::selection { background: rgba(45, 107, 255, .18); color: var(--primary-dark); }

/* ---------- 布局工具 ---------- */
.container { width: 100%; max-width: var(--container); margin: 0 auto; padding: 0 24px; }
.section { padding: var(--section-y) 0; }
.section.bg-soft { background: var(--bg-soft); }

.eyebrow {
    display: inline-flex; align-items: center; gap: 8px;
    font-size: 13px; font-weight: 700; letter-spacing: .14em;
    text-transform: uppercase; color: var(--primary);
    background: var(--primary-soft); padding: 7px 14px; border-radius: 100px;
    margin-bottom: 18px;
}
.eyebrow::before {
    content: ""; width: 7px; height: 7px; border-radius: 50%;
    background: var(--grad);
}
.section-head { max-width: 720px; margin: 0 auto 56px; text-align: center; }
.section-title {
    font-size: clamp(27px, 3.4vw, 42px); font-weight: 800; line-height: 1.25;
    letter-spacing: -.01em;
}
.section-desc { margin-top: 16px; color: var(--text-2); font-size: 17px; }

.gradient-text {
    background: var(--grad);
    -webkit-background-clip: text; background-clip: text;
    -webkit-text-fill-color: transparent; color: transparent;
}

/* ---------- 按钮 ---------- */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 9px;
    padding: 14px 26px; border-radius: 100px; font-size: 15.5px; font-weight: 700;
    transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s var(--ease);
    white-space: nowrap;
}
.btn-primary {
    color: #fff; background: var(--grad);
    box-shadow: 0 10px 24px rgba(45, 107, 255, .32);
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 34px rgba(45, 107, 255, .42); }
.btn-ghost {
    color: var(--primary-dark); background: #fff;
    border: 1.5px solid var(--border); box-shadow: var(--shadow-sm);
}
.btn-ghost:hover { transform: translateY(-3px); border-color: var(--primary); color: var(--primary); }
.btn svg { transition: transform .25s var(--ease); }
.btn:hover svg { transform: translateX(3px); }

/* ---------- 导航 ---------- */
.navbar {
    position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
    transition: background .3s var(--ease), box-shadow .3s var(--ease), padding .3s var(--ease);
    padding: 18px 0;
}
.navbar.scrolled {
    background: rgba(255, 255, 255, .82);
    backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
    box-shadow: 0 6px 24px rgba(22, 45, 90, .08);
    padding: 12px 0;
}
.nav-container {
    max-width: var(--container); margin: 0 auto; padding: 0 24px;
    display: flex; align-items: center; justify-content: space-between; gap: 24px;
}
.nav-logo { display: flex; align-items: center; gap: 14px; }
.nav-logo .logo-icon { width: 64px; height: 64px; border-radius: 14px; }
.logo-text { font-size: 24px; font-weight: 800; letter-spacing: .01em; }
.nav-menu { display: flex; align-items: center; gap: 6px; }
.nav-menu a {
    position: relative; padding: 9px 15px; font-size: 15.5px; font-weight: 600;
    color: var(--text-2); border-radius: 10px; transition: color .2s, background .2s;
}
.nav-menu a:hover { color: var(--primary); background: var(--primary-soft); }
.nav-menu a.active { color: var(--primary); }
.nav-menu a.active::after {
    content: ""; position: absolute; left: 15px; right: 15px; bottom: 3px;
    height: 3px; border-radius: 3px; background: var(--grad);
}
.nav-cta {
    display: inline-flex; align-items: center; gap: 7px;
    padding: 11px 20px; border-radius: 100px; font-weight: 700; font-size: 15px;
    color: #fff; background: var(--grad); box-shadow: 0 8px 20px rgba(45, 107, 255, .3);
    transition: transform .25s var(--ease), box-shadow .25s var(--ease);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 12px 26px rgba(45, 107, 255, .4); }
.mobile-toggle { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.mobile-toggle span { width: 24px; height: 2.5px; border-radius: 2px; background: var(--text); transition: .3s; }

/* ---------- Hero ---------- */
.hero { position: relative; padding: 168px 0 96px; overflow: hidden; }
.hero-bg {
    position: absolute; inset: 0; z-index: -1;
    background:
        radial-gradient(640px 480px at 82% 12%, rgba(6, 182, 212, .14), transparent 60%),
        radial-gradient(620px 480px at 10% 0%, rgba(45, 107, 255, .16), transparent 60%),
        linear-gradient(180deg, #f7faff, #ffffff 70%);
}
.hero-bg::after {
    content: ""; position: absolute; inset: 0;
    background-image: linear-gradient(var(--border-soft) 1px, transparent 1px),
                      linear-gradient(90deg, var(--border-soft) 1px, transparent 1px);
    background-size: 56px 56px;
    -webkit-mask-image: radial-gradient(circle at 50% 30%, #000, transparent 75%);
    mask-image: radial-gradient(circle at 50% 30%, #000, transparent 75%);
    opacity: .5;
}
.hero-grid {
    display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center;
}
.hero-badge {
    display: inline-flex; align-items: center; gap: 9px;
    font-size: 14px; font-weight: 600; color: var(--text-2);
    background: #fff; border: 1px solid var(--border); padding: 8px 16px;
    border-radius: 100px; box-shadow: var(--shadow-sm); margin-bottom: 22px;
}
.hero-badge .dot { width: 8px; height: 8px; border-radius: 50%; background: var(--grad); box-shadow: 0 0 0 4px rgba(45, 107, 255, .16); }
.hero-title {
    font-size: clamp(36px, 5.2vw, 62px); font-weight: 850; line-height: 1.12;
    letter-spacing: -.02em;
}
.hero-title .cursor { color: var(--primary); font-weight: 400; animation: blink 1s steps(2) infinite; }
@keyframes blink { 0%, 50% { opacity: 1; } 51%, 100% { opacity: 0; } }
.hero-sub { margin-top: 16px; font-size: 18px; color: var(--primary-dark); font-weight: 600; }
.hero-desc { margin-top: 14px; font-size: 17px; color: var(--text-2); max-width: 540px; }
.hero-actions { margin-top: 32px; display: flex; gap: 14px; flex-wrap: wrap; }
.hero-stats {
    margin-top: 44px; display: flex; gap: 38px; flex-wrap: wrap;
    padding-top: 30px; border-top: 1px solid var(--border);
}
.stat-num { font-size: 34px; font-weight: 850; color: var(--text); letter-spacing: -.01em; }
.stat-num .suffix { color: var(--primary); }
.stat-label { display: block; font-size: 14px; color: var(--text-3); margin-top: 2px; }

/* Hero 视觉卡 */
.hero-visual { position: relative; }
.hero-card {
    position: relative; background: #fff; border: 1px solid var(--border);
    border-radius: var(--radius-lg); padding: 0; box-shadow: var(--shadow-lg);
    overflow: hidden;
}
.hero-card::before {
    content: ""; position: absolute; top: -40%; right: -30%; width: 70%; height: 80%;
    background: var(--grad); opacity: .12; border-radius: 50%; filter: blur(20px);
    z-index: 1; pointer-events: none;
}
.hero-img { width: 100%; height: auto; display: block; animation: breathe 6s ease-in-out infinite; will-change: transform; }
.hero-pills {
    position: absolute; left: 18px; right: 18px; bottom: 18px; z-index: 2;
    display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
    background: rgba(255, 255, 255, .88); backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, .6); border-radius: 14px; padding: 10px 12px;
    box-shadow: 0 8px 20px rgba(22, 45, 90, .12);
}
.hero-pills span {
    font-size: 12.5px; font-weight: 700; color: var(--primary-dark);
    background: var(--primary-soft); padding: 5px 10px; border-radius: 8px;
}

/* ---------- 关于我们 / 特性 ---------- */
.feature-grid {
    display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px;
}
.feature-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    padding: 30px 26px; box-shadow: var(--shadow-sm);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
}
.feature-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: #d4e0fb; }
.feature-ico {
    width: 54px; height: 54px; border-radius: 15px; display: grid; place-items: center;
    background: var(--grad); color: #fff; margin-bottom: 18px; font-size: 24px;
    box-shadow: 0 10px 22px rgba(45, 107, 255, .28);
}
.feature-card h3 { font-size: 19px; font-weight: 750; margin-bottom: 8px; }
.feature-card p { font-size: 15px; color: var(--text-2); }

/* ---------- 核心业务 ---------- */
.services-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.service-card {
    position: relative; background: var(--surface); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 34px 30px; box-shadow: var(--shadow-sm);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease), border-color .3s var(--ease);
    overflow: hidden;
}
.service-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.service-card.featured { background: var(--grad); border-color: transparent; color: #fff; box-shadow: var(--shadow-lg); }
.service-card.featured .service-desc,
.service-card.featured .service-list li { color: rgba(255, 255, 255, .92); }
.service-card.featured .service-ico { background: rgba(255, 255, 255, .18); color: #fff; }
.service-badge {
    position: absolute; top: 20px; right: 20px; font-size: 12px; font-weight: 700;
    background: rgba(255, 255, 255, .22); color: #fff; padding: 5px 12px; border-radius: 100px;
}
.service-ico {
    width: 60px; height: 60px; border-radius: 16px; display: grid; place-items: center;
    background: var(--primary-soft); color: var(--primary); margin-bottom: 20px;
}
.service-card h3 { font-size: 21px; font-weight: 780; margin-bottom: 12px; }
.service-desc { font-size: 15px; color: var(--text-2); margin-bottom: 20px; }
.service-list { display: flex; flex-wrap: wrap; gap: 9px; margin-bottom: 22px; }
.service-list li {
    font-size: 13.5px; font-weight: 600; color: var(--text-2);
    background: var(--bg-soft); border: 1px solid var(--border-soft);
    padding: 6px 12px; border-radius: 8px;
}
.service-card.featured .service-list li { background: rgba(255, 255, 255, .16); border-color: transparent; color: #fff; }
.service-link {
    display: inline-flex; align-items: center; gap: 7px; font-weight: 700; font-size: 15px;
    color: var(--primary); transition: gap .2s;
}
.service-card.featured .service-link { color: #fff; }
.service-link:hover { gap: 11px; }

/* ---------- 技术栈 ---------- */
.tech { padding: 64px 0; background: var(--bg-soft); border-top: 1px solid var(--border-soft); border-bottom: 1px solid var(--border-soft); }
.tech-marquee { display: flex; overflow: hidden; -webkit-mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); mask-image: linear-gradient(90deg, transparent, #000 12%, #000 88%, transparent); }
.tech-track { display: flex; gap: 14px; padding-right: 14px; animation: scroll-x 28s linear infinite; white-space: nowrap; }
.tech-track span {
    font-size: 15px; font-weight: 600; color: var(--text-2);
    background: #fff; border: 1px solid var(--border); padding: 9px 18px; border-radius: 100px;
    box-shadow: var(--shadow-sm);
}
@keyframes scroll-x { from { transform: translateX(0); } to { transform: translateX(-100%); } }

/* ---------- 开发流程 ---------- */
.timeline { display: grid; grid-template-columns: repeat(5, 1fr); gap: 20px; position: relative; }
.timeline::before {
    content: ""; position: absolute; top: 27px; left: 8%; right: 8%; height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--accent)); opacity: .3;
}
.step { text-align: center; position: relative; }
.step-num {
    width: 56px; height: 56px; border-radius: 50%; margin: 0 auto 18px;
    display: grid; place-items: center; font-size: 19px; font-weight: 800; color: #fff;
    background: var(--grad); box-shadow: 0 10px 22px rgba(45, 107, 255, .3);
    position: relative; z-index: 1; border: 4px solid #fff;
}
.step h3 { font-size: 17px; font-weight: 750; margin-bottom: 7px; }
.step p { font-size: 14px; color: var(--text-2); }

/* ---------- 案例 ---------- */
.cases-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
    background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
    overflow: hidden; box-shadow: var(--shadow-sm);
    transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.case-top {
    height: 200px; position: relative; overflow: hidden;
    background-color: #cfdcf2; background-size: cover; background-position: center;
    transition: background-size .55s var(--ease);
}
.case-card:nth-child(1) .case-top { background-image: url('../assets/img/case1.webp'); }
.case-card:nth-child(2) .case-top { background-image: url('../assets/img/case2.webp'); }
.case-card:nth-child(3) .case-top { background-image: url('../assets/img/case3.webp'); }
.case-card:hover .case-top { background-size: 108%; }
.case-top::before {
    content: ""; position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(20,40,80,.05) 0%, rgba(20,40,80,.5) 100%);
    transition: opacity .3s var(--ease);
}
.case-card:hover .case-top::before { opacity: .75; }
.case-tag {
    position: absolute; top: 14px; left: 14px; z-index: 2; font-size: 12px; font-weight: 700;
    color: #fff; background: rgba(255, 255, 255, .22); padding: 5px 12px; border-radius: 100px;
    backdrop-filter: blur(6px); border: 1px solid rgba(255, 255, 255, .3);
}
.case-body { padding: 24px 24px 28px; }
.case-body h3 { font-size: 19px; font-weight: 750; margin-bottom: 10px; }
.case-body p { font-size: 14.5px; color: var(--text-2); margin-bottom: 16px; }
.case-techs { display: flex; flex-wrap: wrap; gap: 8px; }
.case-techs span {
    font-size: 12.5px; font-weight: 600; color: var(--primary-dark);
    background: var(--primary-soft); padding: 5px 11px; border-radius: 7px;
}

/* ---------- 联系 ---------- */
.contact-wrap { display: grid; grid-template-columns: .9fr 1.1fr; gap: 48px; align-items: start; }
.contact-intro h2 { font-size: clamp(26px, 3vw, 38px); font-weight: 820; line-height: 1.25; }
.contact-intro p { margin-top: 16px; color: var(--text-2); font-size: 16.5px; }
.contact-points { margin-top: 26px; display: grid; gap: 14px; }
.contact-points li { display: flex; gap: 12px; align-items: flex-start; font-size: 15.5px; color: var(--text); }
.contact-points .ck {
    flex: none; width: 26px; height: 26px; border-radius: 50%; display: grid; place-items: center;
    background: var(--grad); color: #fff; font-size: 14px; margin-top: 2px;
}
.contact-form {
    background: #fff; border: 1px solid var(--border); border-radius: var(--radius);
    padding: 32px; box-shadow: var(--shadow-md);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 14px; font-weight: 600; color: var(--text); margin-bottom: 7px; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; font-family: inherit; font-size: 15px; color: var(--text);
    background: var(--bg-soft); border: 1.5px solid var(--border); border-radius: 12px;
    padding: 13px 15px; transition: border-color .2s, box-shadow .2s, background .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
    outline: none; border-color: var(--primary); background: #fff;
    box-shadow: 0 0 0 4px rgba(45, 107, 255, .12);
}
.form-group textarea { resize: vertical; }
.form-note { font-size: 13px; color: var(--text-3); margin-top: 4px; }
.form-success {
    display: none; margin-top: 14px; padding: 13px 16px; border-radius: 12px;
    background: #ecfdf3; border: 1px solid #abefc6; color: #067647; font-size: 14.5px; font-weight: 600;
}
.form-success.show { display: block; }

/* ---------- 页脚 ---------- */
.footer { background: #0f1830; color: #c3cbe0; padding: 64px 0 28px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr; gap: 40px; }
.footer-brand .footer-logo { width: 132px; border-radius: 14px; margin-bottom: 16px; }
.footer-brand p { font-size: 14.5px; color: #929dbd; max-width: 320px; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 700; margin-bottom: 16px; }
.footer-col a { display: block; font-size: 14.5px; color: #929dbd; padding: 6px 0; transition: color .2s; }
.footer-col a:hover { color: #fff; }
.footer-bottom {
    margin-top: 44px; padding-top: 22px; border-top: 1px solid rgba(255, 255, 255, .08);
    font-size: 13.5px; color: #7e89a8; text-align: center;
    display: flex; flex-direction: column; gap: 8px; align-items: center;
}
.footer-bottom a { color: #9aa6c4; text-decoration: none; transition: color .2s; }
.footer-bottom a:hover { color: #fff; text-decoration: underline; }

/* ---------- 滚动进度条 ---------- */
.scroll-progress {
    position: fixed; top: 0; left: 0; height: 3px; width: 0;
    background: var(--grad); z-index: 1100; transition: width .1s linear;
}

/* ---------- 进场动画 ---------- */
.reveal { opacity: 0; transform: translateY(26px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.d1 { transition-delay: .08s; } .d2 { transition-delay: .16s; }
.d3 { transition-delay: .24s; } .d4 { transition-delay: .32s; } .d5 { transition-delay: .40s; }

/* ---------- 动画 ---------- */
@keyframes breathe {
    0%, 100% { transform: scale(1); }
    50%      { transform: scale(1.03); }
}

/* 按钮 shine 光带 */
.btn-primary { position: relative; overflow: hidden; }
.btn-primary::after {
    content: ""; position: absolute; top: 0; left: -120%; width: 55%; height: 100%;
    background: linear-gradient(120deg, transparent, rgba(255, 255, 255, .45), transparent);
    transform: skewX(-20deg); transition: left .65s var(--ease);
    pointer-events: none;
}
.btn-primary:hover::after { left: 120%; }

/* ---------- 响应式 ---------- */
@media (max-width: 980px) {
    :root { --section-y: 78px; }
    .hero-grid { grid-template-columns: 1fr; gap: 44px; }
    .hero-visual { max-width: 460px; }
    .feature-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid { grid-template-columns: 1fr; }
    .timeline { grid-template-columns: 1fr; gap: 30px; }
    .timeline::before { display: none; }
    .step { display: flex; gap: 18px; text-align: left; align-items: flex-start; }
    .step-num { margin: 0; flex: none; }
    .cases-grid { grid-template-columns: 1fr; }
    .contact-wrap { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .nav-menu {
        position: fixed; inset: 0; flex-direction: column; justify-content: center; gap: 22px;
        background: rgba(255, 255, 255, .97); backdrop-filter: blur(14px);
        transform: translateX(100%); transition: transform .35s var(--ease);
    }
    .nav-menu.open { transform: none; }
    .nav-menu a { font-size: 20px; }
    .mobile-toggle { display: flex; z-index: 1001; }
    .nav-cta { display: none; }
}
@media (max-width: 560px) {
    .container, .nav-container { padding: 0 18px; }
    .feature-grid { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .hero-stats { gap: 22px; }
    .footer-grid { grid-template-columns: 1fr; gap: 28px; }
    .nav-logo .logo-icon { width: 50px; height: 50px; }
    .logo-text { font-size: 19px; }
}