/* ===== 全局重置 & 变量 ===== */
:root {
    --primary-blue: #6366f1;
    --primary-purple: #8b5cf6;
    --accent-cyan: #06b6d4;
    --dark-slate: #1e293b;
    --light-slate: #334155;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --white: #ffffff;
    --shadow-sm: 0 4px 12px rgba(0,0,0,0.06);
    --shadow-md: 0 8px 24px rgba(0,0,0,0.08);
    --shadow-hover: 0 12px 32px rgba(99,102,241,0.15);
    --radius: 20px;
    --radius-sm: 12px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}
* { margin:0; padding:0; box-sizing:border-box; }
html { scroll-behavior: smooth; }
body {
    font-family: var(--font);
    background: var(--white);
    color: var(--dark-slate);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.section {
    padding: 80px 0;
}
.section-title {
    text-align: center;
    margin-bottom: 48px;
}
.section-title h2 {
    font-size: 2.2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
}
.section-title p {
    color: var(--light-slate);
    font-size: 1.1rem;
}
.highlight {
    color: var(--primary-purple);
    -webkit-text-fill-color: var(--primary-purple);
}
.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--white);
    padding: 14px 32px;
    border: none;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 14px rgba(99,102,241,0.3);
}
.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 8px 24px rgba(99,102,241,0.4);
}
.btn-secondary {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--gray-100);
    color: var(--dark-slate);
    padding: 10px 20px;
    border: 1px solid var(--gray-200);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.btn-secondary:hover {
    background: var(--gray-200);
    transform: translateY(-1px);
}
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }

/* ===== 导航栏 ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 999;
    background: rgba(255,255,255,0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    transition: var(--transition);
    padding: 12px 0;
}
.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}
.navbar-flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    gap: 10px;
}
.logo i { font-size: 1.8rem; }
.nav-links {
    display: flex;
    gap: 28px;
    align-items: center;
}
.nav-links a {
    font-weight: 500;
    color: var(--light-slate);
    transition: var(--transition);
    padding: 6px 0;
    border-bottom: 2px solid transparent;
}
.nav-links a:hover,
.nav-links a.active {
    color: var(--primary-blue);
    border-bottom-color: var(--primary-blue);
}
.nav-admin-link {
    background: var(--gray-100);
    padding: 8px 18px !important;
    border-radius: 50px;
    border-bottom: none !important;
}
.nav-admin-link:hover {
    background: var(--primary-blue);
    color: var(--white) !important;
}
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}
.hamburger span {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--dark-slate);
    border-radius: 4px;
    transition: var(--transition);
}

/* ===== Hero ===== */
.hero-section {
    padding: 140px 0 80px;
    background: linear-gradient(135deg, #eef2ff 0%, #f5f3ff 100%);
    position: relative;
    overflow: hidden;
}
.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
    flex-wrap: wrap;
}
.hero-text {
    flex: 1 1 400px;
}
.hero-text h1 {
    font-size: 2.8rem;
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--dark-slate);
}
.hero-text p {
    font-size: 1.15rem;
    color: var(--light-slate);
    margin-bottom: 32px;
}
.hero-stats {
    display: flex;
    gap: 32px;
    margin-bottom: 36px;
    flex-wrap: wrap;
}
.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}
.stat-number {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
}
.stat-item span:last-child {
    font-size: 0.9rem;
    color: var(--light-slate);
}
.hero-image {
    flex: 1 1 300px;
    display: flex;
    justify-content: center;
}
.hero-image img {
    max-width: 100%;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
}
.hero-wave {
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 80px;
    overflow: hidden;
}
.hero-wave svg {
    width: 100%;
    height: 100%;
}

/* ===== 优势 ===== */
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 28px;
}
.advantage-card {
    background: var(--white);
    padding: 32px 24px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}
.advantage-card:hover {
    transform: translateY(-8px) scale(1.02);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-blue);
}
.advantage-card i {
    font-size: 2.5rem;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 16px;
}
.advantage-card h4 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 8px;
}
.advantage-card p {
    color: var(--light-slate);
    font-size: 0.95rem;
}

/* ===== 流程 ===== */
.process-steps {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
    position: relative;
}
.process-step {
    flex: 1 1 150px;
    max-width: 180px;
    background: var(--white);
    padding: 24px 12px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
    border: 1px solid var(--gray-100);
    position: relative;
}
.process-step:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}
.step-number {
    display: inline-block;
    width: 40px;
    height: 40px;
    line-height: 40px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--white);
    font-weight: 700;
    margin-bottom: 12px;
}
.process-step h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 6px;
}
.process-step p {
    font-size: 0.85rem;
    color: var(--light-slate);
}

/* ===== 案例 ===== */
.cases-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}
.case-card {
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border: 1px solid var(--gray-100);
}
.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-hover);
}
.case-card-img {
    height: 180px;
    background: linear-gradient(135deg, #e0e7ff, #f0e6ff);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
}
.case-card-body {
    padding: 20px;
}
.case-card-body h4 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 6px;
}
.case-card-body p {
    color: var(--light-slate);
    font-size: 0.9rem;
    margin-bottom: 12px;
}
.case-tag {
    display: inline-block;
    background: var(--gray-100);
    padding: 4px 14px;
    border-radius: 50px;
    font-size: 0.8rem;
    color: var(--primary-blue);
    font-weight: 500;
}

/* ===== 联系/咨询 ===== */
.contact-section {
    background: var(--gray-100);
}
.contact-form-wrapper {
    max-width: 680px;
    margin: 0 auto 40px;
}
.contact-form {
    background: var(--white);
    padding: 36px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.form-row {
    display: flex;
    gap: 16px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}
.form-row input {
    flex: 1 1 200px;
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 14px 18px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 1rem;
    transition: var(--transition);
    background: var(--white);
}
.contact-form input:focus,
.contact-form textarea:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 4px rgba(99,102,241,0.1);
}
.contact-form textarea {
    resize: vertical;
    min-height: 100px;
    margin-bottom: 16px;
}
.btn-submit {
    width: 100%;
    justify-content: center;
}
.form-feedback {
    margin-top: 16px;
    text-align: center;
    font-weight: 500;
    padding: 12px;
    border-radius: var(--radius-sm);
}
.form-feedback.success { background: #dcfce7; color: #166534; }
.form-feedback.error { background: #fee2e2; color: #991b1b; }
.contact-info-cards {
    display: flex;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
    margin-top: 24px;
}
.info-card {
    display: flex;
    align-items: center;
    gap: 10px;
    background: var(--white);
    padding: 14px 24px;
    border-radius: 50px;
    box-shadow: var(--shadow-sm);
    font-weight: 500;
}
.info-card i { color: var(--primary-blue); font-size: 1.2rem; }

/* ===== 页脚 ===== */
.footer {
    background: var(--dark-slate);
    color: var(--gray-300);
    padding: 40px 0;
    text-align: center;
}
.footer-content p { margin-bottom: 8px; }
.footer-links a { color: var(--accent-cyan); margin: 0 8px; transition: var(--transition); }
.footer-links a:hover { color: var(--white); }

/* ===== 回到顶部 ===== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
    color: var(--white);
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    box-shadow: var(--shadow-md);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 99;
}
.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}
.back-to-top:hover {
    transform: scale(1.1) translateY(-3px);
}

/* ===== 管理员界面 ===== */
.admin-body {
    background: var(--gray-100);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}
.admin-login-wrapper {
    width: 100%;
    max-width: 420px;
    padding: 20px;
}
.login-card {
    background: var(--white);
    padding: 40px 32px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    text-align: center;
}
.login-logo {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 4px;
}
.login-subtitle {
    color: var(--light-slate);
    margin-bottom: 28px;
}
.input-group {
    display: flex;
    align-items: center;
    gap: 12px;
    background: var(--gray-100);
    border-radius: 50px;
    padding: 4px 16px;
    margin-bottom: 16px;
    border: 1px solid var(--gray-200);
    transition: var(--transition);
}
.input-group:focus-within {
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.input-group i { color: var(--gray-300); font-size: 1rem; }
.input-group input {
    flex: 1;
    background: transparent;
    border: none;
    padding: 14px 0;
    font-size: 1rem;
    outline: none;
    font-family: var(--font);
}
.login-error {
    color: #dc2626;
    font-size: 0.9rem;
    margin-bottom: 12px;
    min-height: 24px;
}
.btn-login {
    width: 100%;
    justify-content: center;
    padding: 16px;
}

/* 管理面板 */
.admin-panel {
    width: 100%;
    min-height: 100vh;
    background: var(--gray-100);
}
.admin-header {
    background: var(--white);
    padding: 16px 0;
    border-bottom: 1px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 50;
}
.admin-header-flex {
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.admin-header h2 {
    font-size: 1.3rem;
    display: flex;
    align-items: center;
    gap: 10px;
}
.admin-main {
    padding: 32px 24px;
}
.admin-form-section,
.admin-list-section {
    background: var(--white);
    padding: 28px;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 32px;
}
.admin-form-section h3,
.admin-list-section h3 {
    margin-bottom: 20px;
    font-size: 1.2rem;
}
.admin-form-section .form-row {
    margin-bottom: 16px;
}
.admin-form-section input,
.admin-form-section textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    font-family: var(--font);
    font-size: 0.95rem;
    transition: var(--transition);
}
.admin-form-section input:focus,
.admin-form-section textarea:focus {
    border-color: var(--primary-blue);
    outline: none;
    box-shadow: 0 0 0 3px rgba(99,102,241,0.1);
}
.form-actions {
    display: flex;
    gap: 12px;
    margin-top: 16px;
}
.table-wrapper {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    text-align: left;
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    font-size: 0.95rem;
}
th {
    background: var(--gray-100);
    font-weight: 600;
    color: var(--light-slate);
}
tr:hover td {
    background: #f8faff;
}
.action-btn {
    padding: 6px 14px;
    border: none;
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-right: 6px;
}
.action-btn.edit {
    background: #dbeafe;
    color: #1d4ed8;
}
.action-btn.edit:hover { background: #bfdbfe; }
.action-btn.delete {
    background: #fee2e2;
    color: #b91c1c;
}
.action-btn.delete:hover { background: #fecaca; }
.empty-message {
    text-align: center;
    color: var(--gray-300);
    padding: 40px 0;
    font-size: 1rem;
}

/* ===== 响应式 ===== */
@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 0;
        right: -100%;
        width: 260px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        padding: 80px 32px 32px;
        box-shadow: -8px 0 24px rgba(0,0,0,0.1);
        transition: right 0.35s ease;
        gap: 20px;
        align-items: flex-start;
        z-index: 1000;
    }
    .nav-links.open {
        right: 0;
    }
    .hamburger {
        display: flex;
        z-index: 1001;
    }
    .hero-text h1 { font-size: 2rem; }
    .hero-content { flex-direction: column; gap: 32px; }
    .hero-stats { gap: 20px; justify-content: center; }
    .section { padding: 60px 0; }
    .advantages-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
    .process-steps { gap: 12px; }
    .process-step { flex: 1 1 120px; max-width: 140px; }
    .contact-form { padding: 24px; }
    .form-row { flex-direction: column; }
    .contact-info-cards { flex-direction: column; align-items: center; }
    .admin-main { padding: 16px; }
    .admin-form-section, .admin-list-section { padding: 20px; }
    table { font-size: 0.85rem; }
    th, td { padding: 10px 8px; }
}
@media (max-width: 480px) {
    .hero-text h1 { font-size: 1.7rem; }
    .stat-number { font-size: 1.4rem; }
    .btn-primary { padding: 12px 24px; font-size: 0.9rem; }
    .section-title h2 { font-size: 1.6rem; }
    .advantage-card { padding: 24px 16px; }
    .process-step { flex: 1 1 100px; max-width: 120px; padding: 16px 8px; }
    .case-card-body { padding: 16px; }
}