/* 基础重置和变量 */
:root {
    --brand-50: #f0f9ff;
    --brand-100: #e0f2fe;
    --brand-200: #bae6fd;
    --brand-400: #38bdf8;
    --brand-500: #0ea5e9;
    --brand-600: #0284c7;
    --brand-700: #0369a1;
    --brand-900: #0c4a6e;
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-400: #94a3b8;
    --slate-600: #475569;
    --slate-700: #334155;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-600: #2563eb;
    --orange-50: #fff7ed;
    --orange-100: #ffedd5;
    --orange-600: #ea580c;
    --purple-50: #faf5ff;
    --purple-100: #f3e8ff;
    --purple-600: #9333ea;
    --green-500: #22c55e;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--slate-50);
    color: var(--slate-800);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

ul {
    list-style: none;
}

/* 导航栏 */
.navbar {
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    z-index: 50;
}

.navbar-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--brand-600);
}

.navbar-menu {
    display: none;
    align-items: center;
    gap: 2rem;
}

@media (min-width: 768px) {
    .navbar-menu {
        display: flex;
    }
}

.navbar-link {
    color: var(--slate-600);
    font-weight: 500;
}

.navbar-link:hover {
    color: var(--brand-600);
}

.btn {
    display: inline-block;
    padding: 0.5rem 1.25rem;
    border-radius: 9999px;
    font-weight: 600;
    transition: all 0.2s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--brand-600);
    color: white;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-primary:hover {
    background: var(--brand-700);
}

.btn-lg {
    padding: 1rem 2rem;
    border-radius: 0.5rem;
    font-size: 1rem;
}

.btn-outline {
    background: white;
    color: var(--brand-600);
    border: 1px solid var(--brand-200);
}

.btn-outline:hover {
    background: var(--slate-50);
    border-color: var(--brand-400);
}

.btn-white {
    background: white;
    color: var(--brand-900);
}

.btn-white:hover {
    background: var(--brand-50);
    transform: scale(1.05);
}

/* Hero 区域 */
.hero {
    position: relative;
    padding: 8rem 1rem 5rem;
    background: linear-gradient(135deg, var(--brand-50) 0%, white 50%, var(--brand-50) 100%);
    overflow: hidden;
}

.hero-blob {
    position: absolute;
    width: 24rem;
    height: 24rem;
    border-radius: 50%;
    mix-blend-mode: multiply;
    filter: blur(64px);
    opacity: 0.3;
    animation: blob 7s infinite;
}

.hero-blob-1 {
    top: -5rem;
    left: -5rem;
    background: var(--blue-100);
}

.hero-blob-2 {
    top: -5rem;
    right: -5rem;
    background: var(--purple-100);
    animation-delay: 2s;
}

.hero-content {
    max-width: 1280px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
    text-align: center;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--slate-900);
    line-height: 1.2;
    margin-bottom: 1.5rem;
    letter-spacing: -0.02em;
}

@media (min-width: 768px) {
    .hero-title {
        font-size: 3.75rem;
    }
}

.hero-title-gradient {
    background: linear-gradient(90deg, var(--brand-600), var(--brand-400));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--slate-600);
    max-width: 42rem;
    margin: 0 auto 2.5rem;
    line-height: 1.75;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

/* 业务板块 */
.services {
    padding: 5rem 1rem;
    background: white;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: 1.875rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 1rem;
}

.section-description {
    color: var(--slate-600);
    max-width: 42rem;
    margin: 0 auto;
}

.services-grid {
    display: grid;
    gap: 2rem;
}

@media (min-width: 768px) {
    .services-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.service-card {
    position: relative;
    background: white;
    border-radius: 1rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    border: 1px solid var(--slate-100);
    padding: 2rem;
    transition: all 0.3s ease;
}

.service-card:hover {
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    border-color: var(--brand-200);
    transform: translateY(-0.5rem);
}

.service-card-glow {
    position: absolute;
    top: -1.5rem;
    right: -1.5rem;
    width: 6rem;
    height: 6rem;
    border-radius: 50%;
    opacity: 0;
    filter: blur(32px);
    transition: opacity 0.5s ease;
}

.service-card:hover .service-card-glow {
    opacity: 0.5;
}

.service-card-glow.blue { background: var(--blue-100); }
.service-card-glow.orange { background: var(--orange-100); }
.service-card-glow.purple { background: var(--purple-100); }

.service-card-content {
    position: relative;
    z-index: 10;
}

.service-icon {
    width: 3.5rem;
    height: 3.5rem;
    border-radius: 0.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    transition: background 0.3s ease;
}

.service-icon.blue { background: var(--blue-50); }
.service-icon.orange { background: var(--orange-50); }
.service-icon.purple { background: var(--purple-50); }

.service-card:hover .service-icon.blue { background: var(--blue-100); }
.service-card:hover .service-icon.orange { background: var(--orange-100); }
.service-card:hover .service-icon.purple { background: var(--purple-100); }

.service-icon svg {
    width: 2rem;
    height: 2rem;
    transition: transform 0.3s ease;
}

.service-card:hover .service-icon svg {
    transform: scale(1.1) rotate(3deg);
}

.service-icon.blue svg { color: var(--blue-600); }
.service-icon.orange svg { color: var(--orange-600); }
.service-icon.purple svg { color: var(--purple-600); }

.service-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--slate-900);
    margin-bottom: 1rem;
    transition: color 0.3s ease;
}

.service-card:hover .service-title.blue { color: var(--blue-600); }
.service-card:hover .service-title.orange { color: var(--orange-600); }
.service-card:hover .service-title.purple { color: var(--purple-600); }

.service-description {
    color: var(--slate-600);
    margin-bottom: 1.5rem;
    line-height: 1.75;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.service-feature {
    display: flex;
    align-items: center;
    color: var(--slate-700);
}

.service-feature svg {
    width: 1.25rem;
    height: 1.25rem;
    color: var(--green-500);
    margin-right: 0.5rem;
    flex-shrink: 0;
}

/* CTA 区域 */
.cta {
    padding: 5rem 1rem;
    background: var(--brand-900);
    color: white;
    text-align: center;
}

.cta-title {
    font-size: 1.875rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
}

.cta-description {
    color: var(--brand-100);
    font-size: 1.125rem;
    margin-bottom: 2rem;
}

/* Footer */
.footer {
    background: var(--slate-900);
    color: var(--slate-400);
    padding: 2rem 1rem;
    text-align: center;
}

/* 动画 */
@keyframes blob {
    0% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -50px) scale(1.1); }
    66% { transform: translate(-20px, 20px) scale(0.9); }
    100% { transform: translate(0, 0) scale(1); }
}

.fade-in-up {
    animation: fadeInUp 0.5s ease-out forwards;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 滚动条 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

::-webkit-scrollbar-thumb {
    background: #cbd5e1;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94a3b8;
}

/* ========== Auth 页面样式 ========== */
.auth-body {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.auth-navbar {
    background: white;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    width: 100%;
}

.auth-navbar-container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 64px;
}

.auth-back-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--slate-600);
}

.auth-back-link:hover {
    color: var(--brand-600);
}

.auth-back-link svg {
    width: 1.25rem;
    height: 1.25rem;
}

.auth-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--brand-600);
}

.auth-main {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.auth-card {
    background: white;
    border-radius: 1rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.15);
    width: 100%;
    max-width: 28rem;
    overflow: hidden;
}

.auth-tabs {
    display: flex;
    border-bottom: 1px solid var(--slate-100);
}

.auth-tab {
    flex: 1;
    padding: 1rem;
    text-align: center;
    font-weight: 600;
    cursor: pointer;
    border: none;
    background: none;
    border-bottom: 2px solid transparent;
    transition: all 0.2s ease;
    color: var(--slate-400);
}

.auth-tab:hover {
    color: var(--brand-600);
}

.auth-tab.active {
    color: var(--brand-600);
    border-bottom-color: var(--brand-600);
}

.auth-form-container {
    padding: 2rem;
}

.auth-form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.auth-form.hidden {
    display: none;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.form-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--slate-700);
}

.form-label .required {
    color: #ef4444;
}

.form-input {
    width: 100%;
    padding: 0.5rem 1rem;
    border: 1px solid #cbd5e1;
    border-radius: 0.5rem;
    font-size: 1rem;
    outline: none;
    transition: all 0.2s ease;
}

.form-input:focus {
    border-color: var(--brand-500);
    box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.1);
}

.form-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.875rem;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--slate-600);
}

.form-checkbox input {
    width: 1rem;
    height: 1rem;
}

.form-link {
    color: var(--brand-600);
}

.form-link:hover {
    text-decoration: underline;
}

.btn-submit {
    width: 100%;
    padding: 0.75rem;
    background: var(--brand-600);
    color: white;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn-submit:hover {
    background: var(--brand-700);
    box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1);
}

.btn-submit:active {
    transform: scale(0.98);
}

/* 文件上传区域 */
.upload-zone {
    margin-top: 0.25rem;
    display: flex;
    justify-content: center;
    padding: 1.5rem;
    border: 2px dashed #cbd5e1;
    border-radius: 0.5rem;
    background: var(--slate-50);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
}

.upload-zone:hover {
    border-color: var(--brand-500);
    background: var(--brand-50);
}

.upload-zone input[type="file"] {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
    z-index: 10;
}

.upload-placeholder {
    text-align: center;
}

.upload-placeholder svg {
    width: 3rem;
    height: 3rem;
    margin: 0 auto 0.5rem;
    color: var(--slate-400);
}

.upload-zone:hover .upload-placeholder svg {
    color: var(--brand-500);
}

.upload-text {
    font-size: 0.875rem;
    color: var(--slate-600);
}

.upload-text .highlight {
    color: var(--brand-600);
    font-weight: 500;
}

.upload-hint {
    font-size: 0.75rem;
    color: var(--slate-400);
    margin-top: 0.25rem;
}

.upload-filename {
    display: none;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: var(--brand-600);
    font-weight: 500;
    min-height: 80px;
}

.upload-filename.show {
    display: flex;
}

.upload-placeholder.hidden {
    display: none;
}

.form-hint {
    font-size: 0.75rem;
    color: var(--slate-400);
    text-align: center;
    margin-top: 1rem;
}