/* 设备管理平台 - 宣传页 & 登录页共用样式 */
:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --accent: #06b6d4;
    --dark: #0f172a;
    --dark-soft: #1e293b;
    --text: #334155;
    --text-light: #64748b;
    --text-muted: #94a3b8;
    --white: #ffffff;
    --bg: #f8fafc;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.08), 0 2px 4px -2px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 40px -12px rgba(15, 23, 42, 0.18);
    --radius: 12px;
    --radius-lg: 20px;
    --transition: 0.25s ease;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: var(--text);
    background: var(--bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition);
}

img {
    max-width: 100%;
    display: block;
}

/* ========== Header ========== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.8);
    transition: box-shadow var(--transition);
}

.site-header.scrolled {
    box-shadow: var(--shadow);
}

.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.brand {
    display: flex;
    align-items: center;
    gap: 12px;
}

.brand-logo {
    width: 40px;
    height: 40px;
    flex-shrink: 0;
    border-radius: 10px;
    overflow: hidden;
}

.brand-logo img,
.brand-logo svg {
    width: 40px;
    height: 40px;
    display: block;
    object-fit: cover;
}

.brand-name {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.02em;
}

.brand-name span {
    color: var(--primary);
}

.header-nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.header-nav a {
    font-size: 15px;
    color: var(--text);
    font-weight: 500;
}

.header-nav a:hover {
    color: var(--primary);
}

.btn-admin {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 10px 22px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white) !important;
    border-radius: 8px;
    font-size: 14px;
    font-weight: 600;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-admin:hover {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
    color: var(--white) !important;
}

/* ========== Hero ========== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 24px 80px;
    background: linear-gradient(160deg, #0f172a 0%, #1e3a8a 45%, #2563eb 100%);
    overflow: hidden;
}

.hero::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 20% 80%, rgba(6, 182, 212, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(59, 130, 246, 0.2) 0%, transparent 50%);
    pointer-events: none;
}

.hero-grid-bg {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}

.hero-inner {
    position: relative;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content h1 {
    font-size: clamp(2.2rem, 4vw, 3.2rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
    letter-spacing: -0.03em;
    margin-bottom: 20px;
}

.hero-content h1 em {
    font-style: normal;
    background: linear-gradient(90deg, #67e8f9, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.82);
    margin-bottom: 36px;
    max-width: 520px;
    line-height: 1.8;
}

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

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--white);
    color: var(--primary-dark) !important;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 24px 48px -12px rgba(0, 0, 0, 0.25);
}

.btn-outline {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    color: var(--white) !important;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 600;
    transition: background var(--transition), border-color var(--transition);
}

.btn-outline:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: rgba(255, 255, 255, 0.7);
}

.hero-stats {
    display: flex;
    gap: 40px;
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.stat-item .stat-num {
    font-size: 28px;
    font-weight: 800;
    color: var(--white);
}

.stat-item .stat-label {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.6);
    margin-top: 4px;
}

.hero-visual {
    position: relative;
}

.hero-card {
    background: rgba(255, 255, 255, 0.08);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-lg);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.hero-card-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
}

.hero-card-dots {
    display: flex;
    gap: 6px;
}

.hero-card-dots span {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
}

.hero-card-dots span:first-child { background: #ef4444; }
.hero-card-dots span:nth-child(2) { background: #f59e0b; }
.hero-card-dots span:nth-child(3) { background: #22c55e; }

.hero-card-title {
    color: rgba(255, 255, 255, 0.7);
    font-size: 13px;
}

.hero-metrics {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.metric-box {
    background: rgba(255, 255, 255, 0.06);
    border-radius: var(--radius);
    padding: 20px;
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.metric-box .metric-icon {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    margin-bottom: 12px;
}

.metric-box .metric-icon.blue { background: rgba(59, 130, 246, 0.3); }
.metric-box .metric-icon.green { background: rgba(34, 197, 94, 0.3); }
.metric-box .metric-icon.cyan { background: rgba(6, 182, 212, 0.3); }
.metric-box .metric-icon.purple { background: rgba(168, 85, 247, 0.3); }

.metric-box .metric-value {
    font-size: 22px;
    font-weight: 700;
    color: var(--white);
}

.metric-box .metric-label {
    font-size: 12px;
    color: rgba(255, 255, 255, 0.55);
    margin-top: 4px;
}

/* ========== Sections ========== */
.section {
    padding: 100px 24px;
}

.section-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 64px;
}

.section-tag {
    display: inline-block;
    padding: 6px 16px;
    background: rgba(37, 99, 235, 0.08);
    color: var(--primary);
    border-radius: 20px;
    font-size: 13px;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 16px;
}

.section-title {
    font-size: clamp(1.8rem, 3vw, 2.4rem);
    font-weight: 800;
    color: var(--dark);
    letter-spacing: -0.02em;
    margin-bottom: 16px;
}

.section-desc {
    font-size: 17px;
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* ========== Features ========== */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
}

.feature-card {
    background: var(--white);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--border);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(37, 99, 235, 0.2);
}

.feature-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    margin-bottom: 20px;
}

.feature-icon.blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.feature-icon.green { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.feature-icon.cyan { background: linear-gradient(135deg, #cffafe, #a5f3fc); }
.feature-icon.purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.feature-icon.orange { background: linear-gradient(135deg, #ffedd5, #fed7aa); }
.feature-icon.rose { background: linear-gradient(135deg, #ffe4e6, #fecdd3); }

.feature-card h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}

.feature-card p {
    font-size: 14px;
    color: var(--text-light);
    line-height: 1.7;
}

/* ========== Advantages ========== */
.advantages {
    background: var(--dark);
    color: var(--white);
}

.advantages .section-tag {
    background: rgba(255, 255, 255, 0.1);
    color: #93c5fd;
}

.advantages .section-title {
    color: var(--white);
}

.advantages .section-desc {
    color: rgba(255, 255, 255, 0.65);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.advantage-item {
    text-align: center;
    padding: 32px 20px;
    border-radius: var(--radius);
    background: rgba(255, 255, 255, 0.04);
    border: 1px solid rgba(255, 255, 255, 0.08);
    transition: background var(--transition);
}

.advantage-item:hover {
    background: rgba(255, 255, 255, 0.08);
}

.advantage-num {
    font-size: 36px;
    font-weight: 800;
    background: linear-gradient(135deg, #67e8f9, #93c5fd);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}

.advantage-item h4 {
    font-size: 16px;
    font-weight: 600;
    margin-bottom: 8px;
}

.advantage-item p {
    font-size: 13px;
    color: rgba(255, 255, 255, 0.55);
    line-height: 1.6;
}

/* ========== CTA ========== */
.cta-section {
    padding: 80px 24px;
    background: linear-gradient(135deg, var(--primary) 0%, #1d4ed8 100%);
    text-align: center;
}

.cta-section h2 {
    font-size: clamp(1.6rem, 3vw, 2.2rem);
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
}

.cta-section p {
    font-size: 17px;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 32px;
}

.cta-section .btn-primary {
    font-size: 17px;
    padding: 16px 40px;
}

/* ========== Footer ========== */
.site-footer {
    background: #0b1120;
    color: rgba(255, 255, 255, 0.7);
    padding: 60px 24px 32px;
}

.footer-inner {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.6fr 1.4fr 1fr;
    gap: 48px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-brand .brand-name {
    color: var(--white);
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
}

.footer-brand p {
    font-size: 14px;
    line-height: 1.7;
    color: rgba(255, 255, 255, 0.5);
    max-width: 320px;
}

.footer-col h4 {
    font-size: 14px;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: 0.05em;
}

.footer-links {
    list-style: none;
}

.footer-links-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px 28px;
}

.footer-links li {
    margin-bottom: 0;
}

.footer-links a {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.55);
    transition: color var(--transition);
    display: inline-block;
}

.footer-links a:hover {
    color: #93c5fd;
    transform: translateX(2px);
}

.footer-contact p {
    font-size: 14px;
    margin-bottom: 8px;
    color: rgba(255, 255, 255, 0.55);
}

.footer-contact a {
    color: #93c5fd;
}

.footer-bottom {
    padding-top: 28px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
    font-size: 13px;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.5);
}

.footer-bottom a:hover {
    color: #93c5fd;
}

/* ========== Login Page ========== */
.login-page {
    min-height: 100vh;
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.login-brand-panel {
    position: relative;
    background: linear-gradient(160deg, #0f172a 0%, #1e3a8a 50%, #2563eb 100%);
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 60px;
    overflow: hidden;
}

.login-brand-panel::before {
    content: "";
    position: absolute;
    inset: 0;
    background:
        radial-gradient(circle at 30% 70%, rgba(6, 182, 212, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 70% 30%, rgba(59, 130, 246, 0.15) 0%, transparent 50%);
}

.login-brand-content {
    position: relative;
    z-index: 1;
}

.login-brand-content .brand-logo {
    width: 72px;
    height: 72px;
    margin-bottom: 32px;
    border-radius: 16px;
}

.login-brand-content .brand-logo img,
.login-brand-content .brand-logo svg {
    width: 72px;
    height: 72px;
}

.login-brand-content h1 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.login-brand-content p {
    font-size: 16px;
    color: rgba(255, 255, 255, 0.75);
    line-height: 1.8;
    max-width: 400px;
    margin-bottom: 40px;
}

.login-features {
    list-style: none;
}

.login-features li {
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    margin-bottom: 14px;
}

.login-features li::before {
    content: "✓";
    display: flex;
    align-items: center;
    justify-content: center;
    width: 22px;
    height: 22px;
    background: rgba(34, 197, 94, 0.25);
    color: #4ade80;
    border-radius: 50%;
    font-size: 12px;
    font-weight: 700;
    flex-shrink: 0;
}

.login-form-panel {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 40px;
    background: var(--white);
    position: relative;
}

.login-back {
    position: absolute;
    top: 24px;
    left: 24px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-size: 14px;
    color: var(--text-light);
    transition: color var(--transition);
}

.login-back:hover {
    color: var(--primary);
}

.login-form-wrap {
    width: 100%;
    max-width: 400px;
}

.login-form-wrap h2 {
    font-size: 26px;
    font-weight: 800;
    color: var(--dark);
    margin-bottom: 8px;
    letter-spacing: -0.02em;
}

.login-form-wrap .login-subtitle {
    font-size: 15px;
    color: var(--text-light);
    margin-bottom: 36px;
}

.login-field {
    margin-bottom: 20px;
}

.login-field label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 8px;
}

.login-input-wrap {
    position: relative;
    display: flex;
    align-items: center;
}

.login-input-wrap .field-icon {
    position: absolute;
    left: 14px;
    color: var(--text-muted);
    pointer-events: none;
    display: flex;
}

.login-input-wrap input {
    width: 100%;
    height: 48px;
    padding: 0 16px 0 44px;
    border: 1.5px solid var(--border);
    border-radius: 10px;
    font-size: 15px;
    color: var(--dark);
    background: var(--bg);
    transition: border-color var(--transition), box-shadow var(--transition);
    outline: none;
}

.login-input-wrap input:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.12);
    background: var(--white);
}

.login-input-wrap input::placeholder {
    color: var(--text-muted);
}

.login-verify-row {
    display: flex;
    align-items: stretch;
    gap: 10px;
    width: 100%;
}

.login-input-wrap--code {
    flex: 1;
    min-width: 0;
}

.verify-code-send {
    flex-shrink: 0;
    display: flex;
    align-items: stretch;
}

.verify-code-btn {
    height: 48px;
    min-width: 96px;
    padding: 0 16px;
    border: none;
    border-radius: 10px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    white-space: nowrap;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
    transition: transform var(--transition), box-shadow var(--transition), opacity var(--transition);
}

.verify-code-btn:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.35);
}

.verify-code-btn:disabled,
.verify-code-btn.is-counting {
    cursor: not-allowed;
    opacity: 0.65;
    transform: none;
}

.btn-login {
    width: 100%;
    height: 50px;
    margin-top: 8px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: var(--white);
    border: none;
    border-radius: 10px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(37, 99, 235, 0.35);
    transition: transform var(--transition), box-shadow var(--transition);
}

.btn-login:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 6px 20px rgba(37, 99, 235, 0.45);
}

.btn-login:disabled,
.btn-login.is-loading {
    cursor: not-allowed;
    opacity: 0.75;
    transform: none;
    box-shadow: none;
}

.login-footer-note {
    margin-top: 32px;
    text-align: center;
    font-size: 13px;
    color: var(--text-muted);
}

.login-page-footer {
    position: absolute;
    bottom: 24px;
    left: 0;
    right: 0;
    text-align: center;
    font-size: 12px;
    color: var(--text-muted);
}

.login-page-footer a {
    color: var(--text-light);
}

.login-page-footer a:hover {
    color: var(--primary);
}

#abPanel {
    margin-top: 16px;
}

/* ========== Responsive ========== */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-desc {
        margin-left: auto;
        margin-right: auto;
    }

    .hero-actions {
        justify-content: center;
    }

    .hero-stats {
        justify-content: center;
    }

    .hero-visual {
        display: none;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .advantages-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-top {
        grid-template-columns: 1fr 1fr;
    }

    .footer-links-grid {
        grid-template-columns: 1fr 1fr;
    }

    .login-page {
        grid-template-columns: 1fr;
    }

    .login-brand-panel {
        display: none;
    }
}

@media (max-width: 640px) {
    .header-nav a:not(.btn-admin) {
        display: none;
    }

    .features-grid,
    .advantages-grid {
        grid-template-columns: 1fr;
    }

    .footer-top {
        grid-template-columns: 1fr;
    }

    .footer-links-grid {
        grid-template-columns: 1fr 1fr;
        gap: 8px 16px;
    }

    .footer-brand p {
        max-width: none;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .login-form-panel {
        padding: 24px;
    }
}