/* ============================================
   HumanSmart - 禾思咨询 企业官网
   Design System & Global Styles
   ============================================ */

/* ===== Reset & Base ===== */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Colors */
    --color-primary: #0A2540;
    --color-primary-light: #1a3a5c;
    --color-primary-dark: #051828;
    --color-accent: #E86A1F;
    --color-accent-light: #F08A4E;
    --color-accent-dark: #C4530E;
    --color-blue: #1E6DB5;
    --color-blue-light: #3B8DD4;
    --color-bg: #FFFFFF;
    --color-bg-alt: #F7F8FA;
    --color-bg-dark: #0A2540;
    --color-text: #1A1A2E;
    --color-text-light: #4A5568;
    --color-text-muted: #718096;
    --color-border: #E2E8F0;
    --color-white: #FFFFFF;
    --color-shadow: rgba(10, 37, 64, 0.08);
    --color-shadow-hover: rgba(10, 37, 64, 0.15);

    /* Typography */
    --font-sans: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --font-serif: 'Noto Serif SC', 'Songti SC', serif;

    /* Spacing */
    --section-padding: 100px 0;
    --container-width: 1200px;

    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
}

ul {
    list-style: none;
}

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

/* ===== Container ===== */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Typography ===== */
.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-primary);
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-light);
    margin-bottom: 0;
    line-height: 1.8;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-header .section-title {
    margin-bottom: 20px;
}

.section-header .section-subtitle {
    max-width: 680px;
    margin: 0 auto;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 16px;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 32px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-sans);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: var(--transition);
    letter-spacing: 0.02em;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
}

.btn-primary:hover {
    background: var(--color-accent-dark);
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(232, 106, 31, 0.3);
}

.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--color-white);
}

.btn-outline {
    background: transparent;
    color: var(--color-primary);
    border: 1.5px solid var(--color-border);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
}

.btn-large {
    padding: 16px 40px;
    font-size: 1rem;
}

/* ===== Header ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 72px;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    z-index: 1000;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.header.scrolled {
    height: 64px;
    box-shadow: 0 2px 20px var(--color-shadow);
    border-bottom-color: var(--color-border);
}

.header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

.logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.logo-text .cn {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-primary);
}

.logo-text .en {
    font-size: 0.7rem;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 8px 16px;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--color-text);
    transition: var(--transition);
    border-radius: 4px;
}

.nav-link:hover,
.nav-link.active {
    color: var(--color-accent);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -22px;
    left: 50%;
    transform: translateX(-50%);
    width: 24px;
    height: 2px;
    background: var(--color-accent);
    border-radius: 1px;
}

/* Mobile menu toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 8px;
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-primary);
    transition: var(--transition);
    border-radius: 2px;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ===== Footer ===== */
.footer {
    background: var(--color-primary-dark);
    color: rgba(255, 255, 255, 0.7);
    padding: 64px 0 0;
}

.footer-top {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand .logo-text .cn {
    color: var(--color-white);
}

.footer-brand .logo-text .en {
    color: rgba(255, 255, 255, 0.5);
}

.footer-desc {
    margin-top: 20px;
    font-size: 0.9rem;
    line-height: 1.8;
    color: rgba(255, 255, 255, 0.6);
}

.footer-qr {
    margin-top: 24px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-qr img {
    width: 90px;
    height: 90px;
    border-radius: 8px;
    background: var(--color-white);
    padding: 4px;
    flex-shrink: 0;
}

.footer-qr span {
    font-size: 0.8rem;
    color: rgba(255, 255, 255, 0.6);
    line-height: 1.5;
}

.footer-col h4 {
    color: var(--color-white);
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 20px;
}

.footer-col ul li {
    margin-bottom: 12px;
}

.footer-col ul li a {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    transition: var(--transition);
}

.footer-col ul li a:hover {
    color: var(--color-accent);
    padding-left: 4px;
}

.footer-contact-item {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 14px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.footer-contact-item svg {
    flex-shrink: 0;
    margin-top: 3px;
    color: var(--color-accent);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.4);
}

.footer-bottom a {
    color: rgba(255, 255, 255, 0.4);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--color-accent);
}

/* ===== Animations ===== */
.fade-in-up {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.fade-in-up.visible {
    opacity: 1;
    transform: translateY(0);
}

.fade-in {
    opacity: 0;
    transition: opacity 0.8s ease;
}

.fade-in.visible {
    opacity: 1;
}

/* Stagger delays */
.delay-1 { transition-delay: 0.1s; }
.delay-2 { transition-delay: 0.2s; }
.delay-3 { transition-delay: 0.3s; }
.delay-4 { transition-delay: 0.4s; }

/* ===== Utility ===== */
.text-center { text-align: center; }
.bg-alt { background: var(--color-bg-alt); }
.bg-primary { background: var(--color-primary); color: var(--color-white); }
.mt-40 { margin-top: 40px; }
.mt-60 { margin-top: 60px; }

/* ===== Page Banner (for inner pages) ===== */
.page-banner {
    position: relative;
    padding: 140px 0 80px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    color: var(--color-white);
    overflow: hidden;
}

.page-banner::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: radial-gradient(circle at 70% 50%, rgba(232, 106, 31, 0.12) 0%, transparent 60%);
}

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

.page-banner h1 {
    font-size: 2.75rem;
    font-weight: 700;
    margin-bottom: 16px;
    letter-spacing: -0.02em;
}

.page-banner .breadcrumb {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
}

.page-banner .breadcrumb a:hover {
    color: var(--color-accent);
}

.page-banner .banner-desc {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.8);
    max-width: 600px;
    margin-top: 16px;
    line-height: 1.8;
}

/* ===== Cards ===== */
.card {
    background: var(--color-white);
    border-radius: 8px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid var(--color-border);
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: 0 16px 48px var(--color-shadow-hover);
    border-color: transparent;
}

/* ===== Form ===== */
.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text);
    margin-bottom: 8px;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.95rem;
    font-family: var(--font-sans);
    color: var(--color-text);
    background: var(--color-bg-alt);
    border: 1px solid var(--color-border);
    border-radius: 4px;
    transition: var(--transition);
    outline: none;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--color-accent);
    background: var(--color-white);
    box-shadow: 0 0 0 3px rgba(232, 106, 31, 0.1);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
    .footer-top {
        grid-template-columns: 1fr 1fr;
        gap: 32px;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 72px;
        left: 0;
        width: 100%;
        height: 0;
        background: var(--color-white);
        flex-direction: column;
        align-items: stretch;
        padding: 0;
        overflow: hidden;
        transition: var(--transition);
        box-shadow: 0 4px 20px var(--color-shadow);
    }

    .nav.open {
        height: auto;
        padding: 16px 24px;
    }

    .nav-item {
        width: 100%;
    }

    .nav-link {
        padding: 14px 16px;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-link.active::after {
        display: none;
    }

    .footer-top {
        grid-template-columns: 1fr;
        gap: 32px;
    }

    .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
    }

    .page-banner {
        padding: 120px 0 60px;
    }

    .page-banner h1 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .btn {
        padding: 12px 24px;
        font-size: 0.9rem;
    }
}