/* ====================================
   致联智能官网 — ZhiLink Technology
   Style: Modern B2B Industrial
   ==================================== */

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

:root {
    --primary: #1a56db;
    --primary-dark: #1e40af;
    --primary-light: #3b82f6;
    --accent: #0ea5e9;
    --accent-dark: #0284c7;

    --dark: #0f172a;
    --dark-2: #1e293b;
    --gray-900: #111827;
    --gray-800: #1f2937;
    --gray-700: #374151;
    --gray-600: #4b5563;
    --gray-500: #6b7280;
    --gray-400: #9ca3af;
    --gray-300: #d1d5db;
    --gray-200: #e5e7eb;
    --gray-100: #f3f4f6;
    --gray-50: #f9fafb;
    --white: #ffffff;

    --blue-50: #eff6ff;
    --blue-100: #dbeafe;
    --blue-500: #3b82f6;

    --green-50: #ecfdf5;
    --green-500: #10b981;

    --purple-50: #f5f3ff;
    --purple-500: #8b5cf6;

    --orange-50: #fff7ed;
    --orange-500: #f97316;

    --red-50: #fef2f2;
    --red-500: #ef4444;

    --teal-50: #ecfeff;
    --teal-500: #14b8a6;

    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
    --shadow-xl: 0 20px 25px rgba(0,0,0,0.1), 0 10px 10px rgba(0,0,0,0.04);

    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--dark);
    line-height: 1.6;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* === Typography === */
h1, h2, h3, h4, h5 {
    line-height: 1.2;
    font-weight: 700;
}

.section {
    padding: 100px 0;
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    color: var(--primary);
    background: var(--blue-100);
    padding: 4px 14px;
    border-radius: 100px;
    margin-bottom: 16px;
}

.section-header h2 {
    font-size: 2.25rem;
    color: var(--dark);
    margin-bottom: 16px;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--gray-600);
}

/* === Navigation === */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--gray-200);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255,255,255,0.95);
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 800;
    font-size: 1.25rem;
}

.logo-icon-svg {
    background: none !important;
    border-radius: 0 !important;
    width: 70px !important;
    height: 70px !important;
    min-width: 70px !important;
    min-height: 70px !important;
    padding: 0;
    flex-shrink: 0;
}

.logo-icon-svg img {
    width: 100%;
    height: 100%;
    display: block;
}

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

.logo-name {
    font-weight: 700;
    font-size: 1.0625rem;
    color: var(--dark);
}

.logo-en {
    font-size: 0.6875rem;
    color: var(--gray-500);
    font-weight: 500;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 36px;
}

.nav-links a {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    position: relative;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--primary);
}

/* 语言切换 */
.lang-switch {
    display: flex;
    align-items: center;
    gap: 6px;
    margin-left: 12px;
    padding-left: 12px;
    border-left: 1px solid var(--gray-300);
}

.lang-switch a {
    font-size: 0.8125rem !important;
    font-weight: 400 !important;
    color: var(--gray-400) !important;
}

.lang-switch a.lang-active {
    color: var(--primary) !important;
    font-weight: 600 !important;
}

.lang-divider {
    font-size: 0.75rem;
    color: var(--gray-300);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* === Hero === */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: 70px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    background:
        radial-gradient(ellipse 80% 60% at 30% 50%, rgba(26,86,219,0.08) 0%, transparent 60%),
        radial-gradient(ellipse 60% 50% at 70% 30%, rgba(14,165,233,0.06) 0%, transparent 50%),
        linear-gradient(180deg, var(--blue-50) 0%, var(--white) 100%);
    z-index: -1;
}

.hero-content {
    max-width: 800px;
}

.hero-badge {
    display: inline-block;
    font-size: 0.8125rem;
    font-weight: 600;
    color: var(--primary);
    background: var(--blue-100);
    padding: 6px 16px;
    border-radius: 100px;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.75rem;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 20px;
    color: var(--dark);
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-sub {
    font-size: 1.25rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 36px;
}

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

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-size: 1rem;
    font-weight: 600;
    padding: 14px 32px;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
}

.btn-primary {
    background: var(--primary);
    color: white;
    box-shadow: 0 4px 14px rgba(26,86,219,0.35);
}

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(26,86,219,0.4);
}

.btn-outline {
    background: transparent;
    border-color: var(--gray-300);
    color: var(--gray-700);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.btn-submit {
    width: 100%;
    justify-content: center;
    padding: 16px 32px;
    font-size: 1.0625rem;
}

/* === Capabilities === */
.capabilities {
    background: var(--white);
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.cap-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
    transition: var(--transition);
}

.cap-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: var(--blue-100);
}

.cap-icon {
    width: 52px;
    height: 52px;
    border-radius: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

.cap-icon--blue { background: var(--blue-50); }
.cap-icon--green { background: var(--green-50); }
.cap-icon--purple { background: var(--purple-50); }
.cap-icon--orange { background: var(--orange-50); }
.cap-icon--red { background: var(--red-50); }
.cap-icon--teal { background: var(--teal-50); }

.cap-card h3 {
    font-size: 1.1875rem;
    margin-bottom: 12px;
}

.cap-card p {
    color: var(--gray-600);
    font-size: 0.9375rem;
    line-height: 1.65;
}

/* === Process Timeline === */
.process {
    background: var(--gray-50);
}

.process-timeline {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 0;
    flex-wrap: wrap;
    position: relative;
}

.process-step {
    text-align: center;
    flex: 1;
    min-width: 140px;
    padding: 0 10px;
}

.step-number {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    margin: 0 auto 16px;
}

.process-step h4 {
    font-size: 1rem;
    margin-bottom: 8px;
    color: var(--dark);
}

.process-step p {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.process-arrow {
    width: 24px;
    height: 2px;
    background: var(--gray-300);
    margin-top: 28px;
    flex-shrink: 0;
    position: relative;
}

.process-arrow::after {
    content: '→';
    position: absolute;
    right: -12px;
    top: -8px;
    color: var(--gray-400);
    font-size: 1rem;
}

/* === About === */
.about {
    background: var(--white);
}

/* 公司简介故事（单列） */
.about-story {
    max-width: 800px;
    margin: 0 auto 48px;
    text-align: left;
}

.about-story h3 {
    font-size: 1.5rem;
    margin-bottom: 24px;
    color: var(--dark);
}

.about-story p {
    color: var(--gray-600);
    font-size: 1rem;
    line-height: 1.8;
    margin-bottom: 16px;
    text-indent: 2em;
    font-family: var(--font-primary);
}

.about-story strong {
    color: var(--dark);
}

/* 签名块（靠右） */
.signature-wrapper {
    text-align: right;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--gray-200);
}

.signature-wrapper .story-signature {
    font-size: 0.9375rem;
    color: var(--gray-500);
    font-family: var(--font-primary);
    border: none;
    padding: 0;
    margin: 0;
    text-align: right !important;
    display: block;
}



.about-content h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.about-content p {
    color: var(--gray-600);
    font-size: 1rem;
    line-height: 1.7;
    margin-bottom: 32px;
}

.about-stats {
    display: flex;
    justify-content: center;
    gap: 64px;
    margin: 48px auto;
    padding: 32px 48px;
    max-width: 600px;
    background: var(--gray-50);
    border-radius: var(--radius-lg);
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.founder-story {
    margin-top: 0;
}

.founder-story h4 {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--dark);
}

.story-card {
    display: flex;
    gap: 20px;
    padding: 24px;
    background: linear-gradient(135deg, var(--blue-50), var(--white));
    border: 1px solid var(--blue-100);
    border-radius: var(--radius-lg);
    position: relative;
}

.story-icon {
    font-size: 2rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.story-content strong {
    display: block;
    font-size: 1.0625rem;
    color: var(--dark);
    margin-bottom: 12px;
}

.story-content p {
    font-size: 0.9375rem;
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: 12px;
}

.story-content p:last-of-type {
    margin-bottom: 0;
}

.story-content em {
    color: var(--primary);
    font-style: italic;
    font-weight: 500;
}

.story-signature {
    margin-top: 16px;
    padding-top: 12px;
    border-top: 1px solid var(--gray-200);
    font-size: 0.875rem !important;
    color: var(--gray-500) !important;
}

.team-section h4 {
    font-size: 1.125rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.team-members {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.team-member {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 16px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius);
}

.member-avatar {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-light));
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 700;
    font-size: 1.125rem;
    flex-shrink: 0;
}

.member-avatar--green {
    background: linear-gradient(135deg, #059669, #34d399);
}

.team-member strong {
    display: block;
    font-size: 0.9375rem;
    margin-bottom: 2px;
}

.team-member span {
    display: block;
    font-size: 0.8125rem;
    color: var(--gray-600);
}

.team-member small {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-400);
    margin-top: 2px;
}

/* Philosophy */
.philosophy-section h4 {
    font-size: 1.125rem;
    margin-bottom: 24px;
    color: var(--dark);
}

.about-philosophy h3 {
    font-size: 1.375rem;
    margin-bottom: 24px;
}

.philosophy-section {
    text-align: center;
    margin: 48px auto 0;
    max-width: 700px;
}

.philosophy-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin-bottom: 0;
    list-style: none;
    padding: 0;
}

.philosophy-list li {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.6;
    padding: 16px;
    background: var(--gray-50);
    border-radius: var(--radius);
    border-left: 3px solid var(--primary);
}

.supplier-network h4 {
    font-size: 1rem;
    margin-bottom: 16px;
}

.network-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 12px;
}

.tag {
    font-size: 0.8125rem;
    font-weight: 500;
    background: var(--blue-50);
    color: var(--primary);
    padding: 6px 14px;
    border-radius: 100px;
}

.network-note {
    font-size: 0.8125rem;
    color: var(--gray-500);
}

/* === Services === */
.services {
    background: var(--gray-50);
}

.service-block {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    margin-bottom: 20px;
    overflow: hidden;
    transition: var(--transition);
}

.service-block:hover {
    box-shadow: var(--shadow-lg);
}

.service-header {
    display: flex;
    align-items: center;
    gap: 16px;
    padding: 24px 32px;
    cursor: pointer;
    user-select: none;
}

.service-num {
    font-size: 1.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.service-header h3 {
    font-size: 1.1875rem;
    color: var(--dark);
}

.service-body {
    padding: 0 32px 24px 32px;
    color: var(--gray-600);
    line-height: 1.7;
}

.service-body p {
    margin-bottom: 20px;
    font-size: 0.9375rem;
}

.service-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
    margin-bottom: 16px;
}

.service-features span {
    font-size: 0.9375rem;
    color: var(--gray-700);
    padding: 10px 16px;
    background: var(--gray-50);
    border-radius: var(--radius-sm);
}

.service-apply {
    font-size: 0.875rem;
    color: var(--gray-500);
    padding: 12px 16px;
    background: var(--blue-50);
    border-radius: var(--radius-sm);
}

/* Capability Matrix Table */
.capability-matrix {
    overflow-x: auto;
}

.capability-matrix table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9375rem;
}

.capability-matrix th {
    background: var(--gray-50);
    padding: 12px 16px;
    text-align: left;
    font-weight: 600;
    color: var(--gray-700);
    border-bottom: 2px solid var(--gray-200);
}

.capability-matrix td {
    padding: 12px 16px;
    border-bottom: 1px solid var(--gray-100);
    color: var(--gray-600);
}

.capability-matrix tr:hover td {
    background: var(--blue-50);
}

/* === Cases === */
.cases {
    background: var(--white);
}

.case-filters {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.filter-btn {
    font-size: 0.875rem;
    font-weight: 500;
    padding: 8px 20px;
    border: 1px solid var(--gray-200);
    background: var(--white);
    border-radius: 100px;
    cursor: pointer;
    transition: var(--transition);
    font-family: inherit;
    color: var(--gray-600);
}

.filter-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.filter-btn.active {
    background: var(--primary);
    color: white;
    border-color: var(--primary);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
}

.case-card {
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: var(--transition);
}

.case-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.case-img {
    height: 180px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.case-img--carousel {
    padding: 0;
    height: 200px;
    position: relative;
    overflow: hidden;
}

.carousel-wrapper {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.carousel-track {
    display: flex;
    width: 100%;
    height: 100%;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.carousel-slide {
    flex: 0 0 100%;
    height: 100%;
    overflow: hidden;
}

.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    background: var(--gray-100);
}

.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: rgba(255,255,255,0.9);
    border: 1px solid var(--gray-300);
    font-size: 1.125rem;
    cursor: pointer;
    transition: var(--transition);
    z-index: 2;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--gray-700);
    opacity: 0;
}

.carousel-wrapper:hover .carousel-btn {
    opacity: 1;
}

.carousel-btn:hover {
    background: white;
    box-shadow: var(--shadow-md);
}

.carousel-prev { left: 8px; }
.carousel-next { right: 8px; }

.carousel-dots {
    position: absolute;
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 6px;
    z-index: 2;
}

.carousel-dots .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(255,255,255,0.5);
    border: 1px solid rgba(0,0,0,0.15);
    cursor: pointer;
    transition: var(--transition);
}

.carousel-dots .dot.active {
    background: var(--primary);
    border-color: var(--primary);
    width: 24px;
    border-radius: 4px;
}

.case-img-placeholder {
    color: rgba(255,255,255,0.6);
    font-size: 0.875rem;
    font-weight: 500;
}

.case-info {
    padding: 20px;
}

.case-category {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    background: var(--blue-50);
    color: var(--primary);
    padding: 3px 10px;
    border-radius: 100px;
    margin-bottom: 10px;
}

.case-info h3 {
    font-size: 1.0625rem;
    margin-bottom: 6px;
}

.case-client {
    font-size: 0.875rem;
    color: var(--gray-500);
    margin-bottom: 12px;
}

.case-meta {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.case-meta span {
    font-size: 0.8125rem;
    color: var(--gray-400);
}

/* === Contact === */
.contact {
    background: var(--gray-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 40px;
    align-items: start;
}

.contact-form-wrapper {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 40px;
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

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

.form-group input,
.form-group textarea {
    font-size: 0.9375rem;
    padding: 12px 16px;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-sm);
    outline: none;
    transition: var(--transition);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(26,86,219,0.1);
}

.checkbox-group {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.checkbox-item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.875rem;
    color: var(--gray-700);
    cursor: pointer;
    padding: 8px 14px;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-sm);
    transition: var(--transition);
}

.checkbox-item:hover {
    border-color: var(--primary);
}

.checkbox-item input:checked + span,
.checkbox-item:has(input:checked) {
    background: var(--blue-50);
    border-color: var(--primary);
    color: var(--primary);
}

.file-upload {
    border: 2px dashed var(--gray-300);
    border-radius: var(--radius-sm);
    padding: 24px;
    text-align: center;
    transition: var(--transition);
}

.file-upload:hover {
    border-color: var(--primary);
}

.file-hint {
    display: block;
    font-size: 0.8125rem;
    color: var(--gray-400);
    margin-top: 8px;
}

/* Form Success */
.form-success {
    text-align: center;
    padding: 60px 20px;
}

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

.success-icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: var(--green-500);
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    font-weight: 700;
    margin: 0 auto 20px;
}

.form-success h3 {
    font-size: 1.5rem;
    margin-bottom: 12px;
    color: var(--dark);
}

.form-success p {
    color: var(--gray-600);
    font-size: 1rem;
    line-height: 1.7;
}

/* Contact Info Sidebar */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.info-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 32px;
}

.info-card h4 {
    font-size: 1.125rem;
    margin-bottom: 20px;
    color: var(--dark);
}

.info-item {
    display: flex;
    gap: 16px;
    margin-bottom: 20px;
    align-items: flex-start;
}

.info-item:last-child {
    margin-bottom: 0;
}

.info-icon {
    font-size: 1.25rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
}

.info-item strong {
    display: block;
    font-size: 0.8125rem;
    color: var(--gray-500);
    margin-bottom: 2px;
}

.info-item span:last-child {
    font-size: 0.9375rem;
    color: var(--gray-700);
    line-height: 1.5;
}

.cta-card {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    border: none;
}

.cta-card h4 {
    color: white;
}

.cta-card p {
    font-size: 0.9375rem;
    opacity: 0.9;
    margin-bottom: 20px;
    line-height: 1.6;
}

.cta-steps {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.cta-steps span {
    font-size: 0.875rem;
    font-weight: 500;
    opacity: 0.95;
}

/* === Footer === */
.footer {
    background: var(--dark);
    color: var(--gray-300);
    padding: 80px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
    gap: 40px;
    padding-bottom: 60px;
    border-bottom: 1px solid var(--gray-700);
}

.footer-brand .logo {
    margin-bottom: 16px;
}

.footer-brand .logo .logo-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--accent));
}

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

.footer-brand .logo .logo-en {
    color: var(--gray-400);
}

.footer-brand p {
    font-size: 0.875rem;
    line-height: 1.6;
    color: var(--gray-400);
}

.footer-links h4,
.footer-contact h4 {
    font-size: 0.9375rem;
    color: var(--white);
    margin-bottom: 20px;
}

.footer-links a {
    display: block;
    font-size: 0.875rem;
    color: var(--gray-400);
    margin-bottom: 12px;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-contact p {
    font-size: 0.875rem;
    margin-bottom: 10px;
    color: var(--gray-400);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
    font-size: 0.8125rem;
    color: var(--gray-500);
}

.footer-bottom a {
    color: var(--gray-500);
    transition: var(--transition);
}

.footer-bottom a:hover {
    color: var(--gray-300);
}

/* === Back to Top === */
.back-to-top {
    position: fixed;
    bottom: 32px;
    right: 32px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: var(--primary);
    color: white;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: var(--shadow-lg);
    z-index: 100;
}

.back-to-top.visible {
    opacity: 1;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* === Responsive === */
@media (max-width: 1024px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

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

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(16px);
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        border-bottom: 1px solid var(--gray-200);
        display: none;
    }

    .nav-links.open {
        display: flex;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .hero-sub {
        font-size: 1.0625rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .section {
        padding: 60px 0;
    }

    .section-header h2 {
        font-size: 1.75rem;
    }

    .cards-grid {
        grid-template-columns: 1fr;
    }

    .cases-grid {
        grid-template-columns: 1fr;
    }

    .contact-grid {
        grid-template-columns: 1fr;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .process-timeline {
        flex-direction: column;
        align-items: center;
        gap: 24px;
    }

    .process-arrow {
        transform: rotate(90deg);
        margin: 0;
    }

    .process-step {
        min-width: auto;
    }

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

    .service-header {
        padding: 20px;
    }

    .service-body {
        padding: 0 20px 20px;
    }

    .contact-form-wrapper {
        padding: 24px;
    }

    .about-stats {
        gap: 16px;
        padding: 16px;
    }

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

    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }

    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 44px;
        height: 44px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 2rem;
    }
}


/* ===== File Upload Custom ===== */
.file-upload-btn {
    display: inline-block;
    padding: 10px 24px;
    background: var(--primary);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.9375rem;
    font-weight: 500;
    transition: all 0.3s ease;
}
.file-upload-btn:hover {
    background: #0056b3;
}
.file-name {
    display: block;
    margin-top: 8px;
    font-size: 0.8125rem;
    color: #64748b;
}

/* ====================================
   品牌首页 & AI 应用页 新增样式
   ==================================== */

/* --- 小型 Hero 横幅 --- */
.hero-compact {
    min-height: 40vh;
    padding: 6rem 0 3rem;
}
.hero-compact .hero-content h1 {
    font-size: 2.2rem;
}
.hero-compact .hero-sub {
    font-size: 0.95rem;
    max-width: 600px;
}
@media (max-width: 768px) {
    .hero-compact {
        min-height: auto;
        padding: 5rem 0 2rem;
    }
    .hero-compact .hero-content h1 {
        font-size: 1.6rem;
    }
}

/* --- Hero 双核副标题 --- */
.hero-dual-sub {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--gray-600);
    margin-bottom: 0.75rem;
}

/* --- 业务入口卡片 --- */
.biz-cards {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}
@media (max-width: 768px) {
    .biz-cards {
        grid-template-columns: 1fr;
    }
}

.biz-card {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    text-decoration: none;
    color: inherit;
    transition: transform var(--transition), box-shadow var(--transition);
    position: relative;
    overflow: hidden;
}
.biz-card:hover {
    transform: translateY(-4px);
}
.biz-card--mfg {
    background: linear-gradient(135deg, #eff6ff 0%, #dbeafe 100%);
    border: 1px solid #bfdbfe;
}
.biz-card--mfg:hover {
    box-shadow: 0 8px 30px rgba(26, 86, 219, 0.15);
}
.biz-card--ai {
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
    border: 1px solid #ddd6fe;
}
.biz-card--ai:hover {
    box-shadow: 0 8px 30px rgba(139, 92, 246, 0.15);
}

.biz-card-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.biz-card h3 {
    font-size: 1.35rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.biz-card > p {
    font-size: 0.95rem;
    color: var(--gray-600);
    margin-bottom: 1rem;
    line-height: 1.5;
}

.biz-card-tags {
    list-style: none;
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    padding: 0;
}
.biz-card-tags li {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 500;
    border-radius: 100px;
}
.biz-card--mfg .biz-card-tags li {
    background: #dbeafe;
    color: var(--primary-dark);
}
.biz-card--ai .biz-card-tags li {
    background: #ede9fe;
    color: #6d28d9;
}

.biz-card-arrow {
    margin-top: auto;
    font-weight: 600;
    font-size: 0.9rem;
}
.biz-card--mfg .biz-card-arrow { color: var(--primary); }
.biz-card--ai  .biz-card-arrow { color: #7c3aed; }

/* --- 关于我们摘要 --- */
.about-summary .about-story {
    max-width: 800px;
    margin: 0 auto 3rem;
}
.about-summary .about-story p {
    font-size: 1rem;
    line-height: 1.8;
    color: var(--gray-700);
    margin-bottom: 1rem;
}

/* --- AI 案例卡片 --- */
.ai-cases-list {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.ai-case-card {
    background: var(--white);
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: box-shadow var(--transition);
}
.ai-case-card:hover {
    box-shadow: var(--shadow-lg);
}

.ai-case-header {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1.25rem;
    flex-wrap: wrap;
}
.ai-case-icon {
    font-size: 2rem;
}
.ai-case-header h3 {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--dark);
    flex: 1;
}

.ai-case-tags {
    display: flex;
    gap: 0.4rem;
}
.ai-tag {
    display: inline-block;
    padding: 0.2rem 0.65rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 100px;
    background: var(--blue-50);
    color: var(--primary);
}

.ai-case-body {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}
@media (max-width: 768px) {
    .ai-case-body {
        grid-template-columns: 1fr;
    }
}

.ai-case-desc {
    font-size: 0.95rem;
    line-height: 1.7;
    color: var(--gray-700);
}
.ai-case-desc p {
    margin-bottom: 0.75rem;
}

.ai-case-media {
    background: var(--gray-50);
    border: 2px dashed var(--gray-200);
    border-radius: var(--radius);
    min-height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
}
.ai-media-placeholder {
    color: var(--gray-400);
    font-size: 0.9rem;
    text-align: center;
}
.ai-case-media img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-sm);
}

/* --- AI CTA Banner --- */
.ai-cta-banner {
    text-align: center;
    background: linear-gradient(135deg, #f5f3ff 0%, #ede9fe 100%);
    border-radius: var(--radius-lg);
    padding: 2.5rem 2rem;
    max-width: 700px;
    margin: 0 auto;
}
.ai-cta-banner h3 {
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 0.5rem;
}
.ai-cta-banner p {
    font-size: 1rem;
    color: var(--gray-600);
    margin-bottom: 1.5rem;
}

/* --- AI 页 Hero 微调 --- */
.hero-compact--ai .hero-content h1 .gradient-text {
    font-size: 2rem;
}
@media (max-width: 768px) {
    .hero-compact--ai .hero-content h1 .gradient-text {
        font-size: 1.5rem;
    }
}