/* ============================================
   Kunming Qian Cloud Technology Co., Ltd.
   Dark Theme - Professional IT Services
   ============================================ */

:root {
    --bg-primary: #070b14;
    --bg-secondary: #0c1222;
    --bg-card: #111829;
    --bg-card-hover: #162035;
    --accent: #0ea5e9;
    --accent-dim: #0284c7;
    --accent-glow: rgba(14, 165, 233, 0.12);
    --text-primary: #e2e8f0;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #1e293b;
    --border-light: #263348;
    --gradient-1: linear-gradient(135deg, #0ea5e9, #6366f1);
    --gradient-2: linear-gradient(135deg, #0ea5e9 0%, #38bdf8 50%, #6366f1 100%);
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.3s;
}

a:hover {
    color: #fff;
}

img { max-width: 100%; height: auto; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ===== HEADER ===== */
.site-header {
    position: fixed;
    top: 0; left: 0; right: 0;
    z-index: 1000;
    background: rgba(7, 11, 20, 0.9);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    width: 38px;
    height: 38px;
    background: var(--gradient-1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 900;
    font-size: 1.1rem;
    color: #fff;
}

.logo span {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: 8px;
}

.nav-links a {
    padding: 8px 16px;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--text-primary);
    background: rgba(255,255,255,0.05);
}

.nav-cta {
    background: var(--gradient-1) !important;
    color: #fff !important;
    padding: 8px 20px !important;
    border-radius: 8px !important;
    font-weight: 600 !important;
}

.nav-cta:hover { opacity: 0.9; transform: translateY(-1px); }

.mobile-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: 8px;
}

/* ===== HERO ===== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 72px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at 20% 50%, rgba(14,165,233,0.06) 0%, transparent 50%),
                radial-gradient(ellipse at 80% 50%, rgba(99,102,241,0.06) 0%, transparent 50%);
    pointer-events: none;
}

.hero-grid {
    position: absolute;
    inset: 0;
    background-image: linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
                     linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 60px 60px;
    pointer-events: none;
}

.hero-content { position: relative; z-index: 2; max-width: 800px; }

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    background: rgba(14,165,233,0.1);
    border: 1px solid rgba(14,165,233,0.2);
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 24px;
    letter-spacing: -0.02em;
}

.hero h1 .highlight {
    background: var(--gradient-2);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.15rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin-bottom: 36px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 10px;
    font-weight: 600;
    font-size: 0.95rem;
    border: none;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-secondary {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-light);
}

.btn-secondary:hover {
    border-color: var(--accent);
    background: rgba(14,165,233,0.05);
    transform: translateY(-2px);
}

/* ===== SECTION COMMON ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; margin-bottom: 64px; }

.section-tag {
    display: inline-block;
    padding: 4px 14px;
    background: rgba(14,165,233,0.08);
    border: 1px solid rgba(14,165,233,0.15);
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--accent);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.section-header h2 { font-size: 2.5rem; font-weight: 700; margin-bottom: 16px; }
.section-header p { color: var(--text-secondary); max-width: 600px; margin: 0 auto; font-size: 1.05rem; }

/* ===== SERVICES ===== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(340px,1fr)); gap: 24px; }

.service-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px 32px;
    transition: all 0.4s;
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0;
    height: 3px;
    background: var(--gradient-1);
    opacity: 0;
    transition: opacity 0.4s;
}

.service-card:hover {
    border-color: var(--border-light);
    transform: translateY(-4px);
    background: var(--bg-card-hover);
}

.service-card:hover::before { opacity: 1; }

.service-icon {
    width: 56px; height: 56px;
    background: rgba(14,165,233,0.1);
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.service-card h3 { font-size: 1.2rem; margin-bottom: 12px; }
.service-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; }

/* ===== ABOUT ===== */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-text h2 { font-size: 2.5rem; margin-bottom: 24px; }
.about-text p { color: var(--text-secondary); margin-bottom: 20px; }

.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }

.stat-item {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px;
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label { color: var(--text-secondary); font-size: 0.85rem; margin-top: 4px; }

/* ===== FEATURES ===== */
.features-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 20px; }

.feature-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 14px;
    padding: 28px 24px;
    transition: all 0.3s;
}

.feature-card:hover {
    border-color: var(--border-light);
    transform: translateY(-2px);
}

.feature-card .icon { font-size: 1.8rem; margin-bottom: 14px; }
.feature-card h4 { font-size: 1.05rem; margin-bottom: 8px; }
.feature-card p { color: var(--text-secondary); font-size: 0.88rem; }

/* ===== TEAM ===== */
.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px,1fr)); gap: 24px; }

.team-card {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px 24px;
    text-align: center;
    transition: all 0.3s;
}

.team-card:hover {
    border-color: var(--border-light);
    transform: translateY(-4px);
}

.team-avatar {
    width: 80px; height: 80px;
    border-radius: 50%;
    background: var(--gradient-1);
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: #fff;
    font-weight: 700;
}

.team-card h4 { font-size: 1rem; margin-bottom: 4px; }
.team-card .role { font-size: 0.85rem; color: var(--accent); margin-bottom: 12px; }
.team-card p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.6; }

/* ===== CONTACT ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.contact-info h3 { font-size: 1.8rem; margin-bottom: 24px; }

.contact-details { list-style: none; }
.contact-details li { display: flex; gap: 16px; margin-bottom: 20px; }

.contact-details .icon {
    width: 44px; height: 44px; min-width: 44px;
    background: rgba(14,165,233,0.1);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
}

.contact-details .label { font-size: 0.8rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; }
.contact-details .value { color: var(--text-primary); font-weight: 500; }

.contact-form {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 36px;
}

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 6px; font-weight: 500; }

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: inherit;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent);
}

.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }

/* ===== FOOTER ===== */
.site-footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border);
    padding: 60px 0 30px;
}

.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; margin-top: 12px; max-width: 300px; }
.footer-heading { font-size: 0.9rem; font-weight: 600; margin-bottom: 16px; text-transform: uppercase; letter-spacing: 1px; }

.footer-links { list-style: none; }
.footer-links li { margin-bottom: 10px; }
.footer-links a { color: var(--text-secondary); font-size: 0.88rem; }
.footer-links a:hover { color: var(--accent); }

.footer-bottom {
    border-top: 1px solid var(--border);
    padding-top: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-bottom p { color: var(--text-muted); font-size: 0.83rem; }

/* ===== PAGE HEADER ===== */
.page-header {
    padding-top: 136px;
    padding-bottom: 48px;
    background: radial-gradient(ellipse at 50% 0%, rgba(14,165,233,0.05) 0%, transparent 60%);
    text-align: center;
}

.page-header h1 { font-size: 2.8rem; font-weight: 800; margin-bottom: 12px; }
.page-header p { color: var(--text-secondary); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ===== CONTENT PAGES ===== */
.content-page {
    background: var(--bg-secondary);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 48px;
    margin-bottom: 60px;
}

.content-page h2 { font-size: 1.6rem; margin-top: 40px; margin-bottom: 16px; color: var(--accent); }
.content-page h3 { font-size: 1.2rem; margin-top: 32px; margin-bottom: 12px; }
.content-page p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.8; }
.content-page ul, .content-page ol { color: var(--text-secondary); margin-bottom: 16px; padding-left: 24px; }
.content-page li { margin-bottom: 8px; }
.content-page strong { color: var(--text-primary); }
.last-updated { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 24px; font-style: italic; }

/* ===== SERVICE DETAIL ===== */
.service-detail {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 24px;
}

.service-detail h3 { font-size: 1.3rem; margin-bottom: 16px; }
.service-detail p { color: var(--text-secondary); margin-bottom: 12px; }
.service-detail ul { color: var(--text-secondary); padding-left: 20px; margin-bottom: 12px; }
.service-detail li { margin-bottom: 6px; }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
    .mobile-toggle { display: block; }
    .nav-links {
        display: none;
        position: absolute;
        top: 72px; left: 0; right: 0;
        background: var(--bg-primary);
        border-bottom: 1px solid var(--border);
        flex-direction: column;
        padding: 16px 24px;
        gap: 4px;
    }
    .nav-links.open { display: flex; }
    .nav-links a { padding: 12px 16px; }
    .hero h1 { font-size: 2.2rem; }
    .about-grid, .contact-grid { grid-template-columns: 1fr; gap: 32px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .section { padding: 60px 0; }
    .section-header h2 { font-size: 1.8rem; }
    .content-page { padding: 24px; }
    .form-row { grid-template-columns: 1fr; }
}

@media (max-width: 480px) {
    .hero h1 { font-size: 1.8rem; }
    .footer-grid, .stats-grid, .services-grid { grid-template-columns: 1fr; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }

.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.fade-in.visible { opacity: 1; transform: translateY(0); }