/* ========================================
   仝艾智能 - 公司官网样式表
   Beijing TungAi Information Technology Co., Ltd.
   ======================================== */

/* --- CSS 变量 --- */
:root {
    --color-primary: #2563EB;
    --color-primary-dark: #1D4ED8;
    --color-primary-light: #3B82F6;
    --color-secondary: #06B6D4;
    --color-accent: #8B5CF6;
    --color-gradient-1: #4FACFE;
    --color-gradient-2: #00F2FE;
    --color-gradient-3: #43E97B;
    --color-gradient-4: #A18CD1;
    --color-gradient-5: #F6D365;

    --bg-primary: #FFFFFF;
    --bg-secondary: #F8FAFC;
    --bg-tertiary: #F1F5F9;
    --bg-dark: #0F172A;
    --bg-card: #FFFFFF;

    --text-primary: #1E293B;
    --text-secondary: #475569;
    --text-tertiary: #94A3B8;
    --text-inverse: #FFFFFF;

    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.12);
    --shadow-xl: 0 20px 60px rgba(0,0,0,0.15);

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;

    --font-sans: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --section-padding: 100px 0;

    --max-width: 1200px;
}

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

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

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background: var(--bg-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
}

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

ul { list-style: none; }

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

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

/* --- Section Shared Styles --- */
.section {
    padding: var(--section-padding);
    position: relative;
}

.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto 60px;
}

.section-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 20px;
    background: linear-gradient(135deg, rgba(79, 172, 254, 0.12), rgba(0, 242, 254, 0.12));
    color: var(--color-primary);
    font-size: 0.85rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 16px;
    border: 1px solid rgba(79, 172, 254, 0.2);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-desc {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 28px;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    border: 2px solid transparent;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

.btn:active { transform: scale(0.97); }

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(37, 99, 235, 0.3);
}

.btn-primary:hover {
    box-shadow: 0 6px 25px rgba(37, 99, 235, 0.45);
    transform: translateY(-2px);
    color: white;
}

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

.btn-outline:hover {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-color: transparent;
    transform: translateY(-2px);
}

.btn-sm { padding: 8px 20px; font-size: 0.9rem; }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; }
.btn-block { width: 100%; justify-content: center; }

/* ========================================
   HEADER & NAVIGATION
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: var(--transition);
    background: transparent;
}

.header.scrolled {
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 10px rgba(0,0,0,0.08);
    padding: 10px 0;
}

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

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

.logo-icon svg {
    display: block;
    width: 44px;
    height: 44px;
}

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

.logo-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
    line-height: 1.2;
}

.logo-subtitle {
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.75);
    letter-spacing: 0.5px;
}

/* Nav */
.nav-list {
    display: flex;
    gap: 32px;
}

.nav-link {
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--text-secondary);
    position: relative;
    padding: 4px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    transition: var(--transition);
    border-radius: 2px;
}

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

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

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

/* Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
}

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

.menu-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

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

.menu-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ========================================
   HERO
   ======================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    background: linear-gradient(160deg, #0F172A 0%, #1E293B 40%, #0F172A 100%);
    overflow: hidden;
    padding-top: 80px;
}

.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}

.hero-particles {
    position: absolute;
    inset: 0;
    background-image:
        radial-gradient(2px 2px at 20% 30%, rgba(79,172,254,0.4), transparent),
        radial-gradient(2px 2px at 40% 70%, rgba(0,242,254,0.3), transparent),
        radial-gradient(1px 1px at 60% 20%, rgba(79,172,254,0.5), transparent),
        radial-gradient(1px 1px at 80% 60%, rgba(0,242,254,0.3), transparent),
        radial-gradient(2px 2px at 10% 80%, rgba(139,92,246,0.3), transparent),
        radial-gradient(1px 1px at 70% 90%, rgba(79,172,254,0.4), transparent),
        radial-gradient(1px 1px at 90% 40%, rgba(0,242,254,0.3), transparent),
        radial-gradient(2px 2px at 50% 50%, rgba(139,92,246,0.2), transparent);
    background-size: 200px 200px;
    animation: particleDrift 8s ease-in-out infinite alternate;
}

@keyframes particleDrift {
    0% { transform: translate(0, 0) scale(1); }
    100% { transform: translate(20px, -20px) scale(1.05); }
}

.hero-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-content {
    color: var(--text-inverse);
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    border-radius: 20px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    font-size: 0.85rem;
    font-weight: 500;
    letter-spacing: 1px;
    margin-bottom: 24px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 3.2rem;
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: 20px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.15rem;
    color: rgba(255,255,255,0.7);
    line-height: 1.8;
    margin-bottom: 32px;
    max-width: 520px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    margin-bottom: 48px;
}

.hero-actions .btn-outline {
    border-color: rgba(255,255,255,0.3);
    color: white;
}

.hero-actions .btn-outline:hover {
    border-color: transparent;
    color: white;
}

/* Hero Stats */
.hero-stats {
    display: flex;
    gap: 48px;
}

.stat-item {
    display: flex;
    flex-wrap: wrap;
    align-items: baseline;
    gap: 2px;
    position: relative;
}

.stat-item + .stat-item::before {
    content: '';
    position: absolute;
    left: -24px;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 40px;
    background: rgba(255,255,255,0.15);
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-gradient-1), var(--color-gradient-2));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-plus,
.stat-percent {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-gradient-2);
}

.stat-label {
    width: 100%;
    font-size: 0.85rem;
    color: rgba(255,255,255,0.5);
    margin-top: 2px;
}

/* Hero Visual */
.hero-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-illustration {
    width: 100%;
    max-width: 440px;
    aspect-ratio: 1;
}

/* Orbit Animation */
.orbit-container {
    position: relative;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.orbit-center {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    box-shadow: 0 0 40px rgba(79, 172, 254, 0.4), 0 0 80px rgba(0, 242, 254, 0.2);
    position: relative;
    z-index: 2;
    animation: pulseGlow 3s ease-in-out infinite;
}

@keyframes pulseGlow {
    0%, 100% { box-shadow: 0 0 40px rgba(79, 172, 254, 0.4), 0 0 80px rgba(0, 242, 254, 0.2); }
    50% { box-shadow: 0 0 60px rgba(79, 172, 254, 0.6), 0 0 120px rgba(0, 242, 254, 0.3); }
}

.orbit-ring {
    position: absolute;
    border-radius: 50%;
    border: 1px solid rgba(79, 172, 254, 0.15);
    animation: ringRotate 20s linear infinite;
}

.ring-1 { width: 60%; height: 60%; }
.ring-2 { width: 80%; height: 80%; animation-duration: 30s; animation-direction: reverse; }
.ring-3 { width: 100%; height: 100%; animation-duration: 40s; }

@keyframes ringRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.orbit-item {
    position: absolute;
    width: 44px;
    height: 44px;
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.1rem;
    z-index: 1;
    animation: float 4s ease-in-out infinite;
}

.orbit-item:nth-child(n) { animation-delay: calc(var(--i, 0) * 0.6s); }

.item-1 { --i: 0; top: 12%; left: 50%; transform: translateX(-50%); }
.item-2 { --i: 1; right: 8%; top: 35%; }
.item-3 { --i: 2; bottom: 15%; right: 20%; }
.item-4 { --i: 3; bottom: 10%; left: 25%; }
.item-5 { --i: 4; left: 5%; top: 40%; }
.item-6 { --i: 5; top: 20%; right: 30%; }

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.orbit-item:nth-child(2) { animation-delay: 0.5s; }
.orbit-item:nth-child(3) { animation-delay: 1s; }
.orbit-item:nth-child(4) { animation-delay: 1.5s; }
.orbit-item:nth-child(5) { animation-delay: 2s; }
.orbit-item:nth-child(6) { animation-delay: 2.5s; }

/* Hero Wave */
.hero-wave {
    position: absolute;
    bottom: -1px;
    left: 0;
    right: 0;
    line-height: 0;
}

.hero-wave svg {
    display: block;
    width: 100%;
    height: 80px;
}

/* ========================================
   ABOUT
   ======================================== */
.about {
    background: var(--bg-primary);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-bottom: 60px;
}

.about-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.about-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    background: linear-gradient(135deg, rgba(79,172,254,0.1), rgba(0,242,254,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.4rem;
    color: var(--color-primary);
    margin-bottom: 20px;
}

.about-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.about-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
}

/* About Company */
.about-company {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    background: var(--bg-secondary);
    border-radius: var(--radius-xl);
    padding: 48px;
    align-items: center;
}

.company-info h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 4px;
}

.company-fullname {
    color: var(--text-tertiary);
    font-size: 0.9rem;
    margin-bottom: 20px;
}

.company-features {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.company-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.95rem;
    color: var(--text-secondary);
}

.company-features li i {
    color: var(--color-gradient-3);
    font-size: 1rem;
}

/* Skill Bars */
.stat-chart {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.stat-bar-label {
    display: flex;
    justify-content: space-between;
    font-size: 0.9rem;
    font-weight: 500;
    margin-bottom: 6px;
}

.stat-bar-label span:last-child {
    color: var(--color-primary);
    font-weight: 700;
}

.stat-bar-track {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
}

.stat-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    border-radius: 4px;
    transition: width 1.5s ease;
    width: 0;
}

/* ========================================
   SERVICES
   ======================================== */
.services {
    background: var(--bg-secondary);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.service-card {
    background: var(--bg-card);
    border-radius: var(--radius-lg);
    padding: 36px 28px;
    border: 1px solid var(--border-color);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-secondary));
    opacity: 0;
    transition: var(--transition);
}

.service-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.service-card:hover::before {
    opacity: 1;
}

.service-icon-wrapper {
    margin-bottom: 20px;
}

.service-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-md);
    background: color-mix(in srgb, var(--icon-color) 10%, transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: var(--icon-color);
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 12px;
}

.service-card > p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 20px;
}

.service-features {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-bottom: 20px;
}

.service-features li {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.service-features li i {
    width: 20px;
    text-align: center;
    color: var(--color-primary);
    font-size: 0.85rem;
}

.service-link {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--color-primary);
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.service-link i {
    font-size: 0.8rem;
    transition: var(--transition);
}

.service-link:hover i {
    transform: translateX(4px);
}

/* ========================================
   PROCESS
   ======================================== */
.process {
    background: var(--bg-primary);
}

.process-steps {
    display: flex;
    flex-direction: column;
    gap: 0;
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.process-step {
    display: flex;
    gap: 24px;
    align-items: flex-start;
}

.step-number {
    flex-shrink: 0;
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 800;
    font-size: 1.1rem;
    position: relative;
    z-index: 1;
}

.step-content {
    padding-top: 12px;
}

.step-content h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.step-content p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.process-connector {
    width: 2px;
    height: 40px;
    background: linear-gradient(180deg, var(--color-primary), var(--color-secondary));
    margin-left: 27px;
    opacity: 0.3;
}

/* ========================================
   CASES
   ======================================== */
.cases {
    background: var(--bg-secondary);
}

.cases-filter {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.case-filter-btn {
    padding: 8px 24px;
    border-radius: 50px;
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    font-family: var(--font-sans);
}

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

.case-filter-btn.active {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-color: transparent;
}

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

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

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-lg);
}

.case-img { overflow: hidden; }

.case-placeholder {
    aspect-ratio: 16 / 10;
    background: linear-gradient(135deg, color-mix(in srgb, var(--case-color) 15%, transparent), transparent);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    color: var(--case-color);
    transition: var(--transition);
}

.case-card:hover .case-placeholder {
    transform: scale(1.05);
}

.case-info {
    padding: 24px;
}

.case-tag {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 4px;
    background: rgba(79,172,254,0.1);
    color: var(--color-primary);
    font-size: 0.75rem;
    font-weight: 600;
    margin-bottom: 10px;
}

.case-info h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
}

.case-info p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ========================================
   ADVANTAGES
   ======================================== */
.advantages {
    background: var(--bg-primary);
}

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

.advantage-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    text-align: center;
    transition: var(--transition);
}

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

.advantage-icon {
    width: 56px;
    height: 56px;
    border-radius: 50%;
    background: linear-gradient(135deg, rgba(79,172,254,0.1), rgba(0,242,254,0.1));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.3rem;
    color: var(--color-primary);
    margin: 0 auto 16px;
}

.advantage-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.advantage-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   PARTNERS
   ======================================== */
.partners {
    background: var(--bg-secondary);
}

.partners-logos {
    display: grid;
    grid-template-columns: repeat(6, 1fr);
    gap: 24px;
}

.partner-logo {
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-placeholder {
    width: 100%;
    aspect-ratio: 1;
    max-width: 140px;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    color: var(--text-tertiary);
    font-size: 1.5rem;
    background: var(--bg-primary);
    transition: var(--transition);
}

.logo-placeholder:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.logo-placeholder span {
    font-size: 0.8rem;
    font-weight: 500;
}

/* ========================================
   CONTACT
   ======================================== */
.contact {
    background: linear-gradient(160deg, #0F172A, #1E293B);
    position: relative;
}

.contact .section-header {
    color: var(--text-inverse);
}

.contact .section-desc {
    color: rgba(255,255,255,0.6);
}

.contact .section-title {
    color: white;
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}

/* Contact Info */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.contact-item {
    display: flex;
    gap: 16px;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    color: var(--color-gradient-2);
    flex-shrink: 0;
}

.contact-item h4 {
    color: white;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 4px;
}

.contact-item p,
.contact-item a {
    color: rgba(255,255,255,0.6);
    font-size: 0.9rem;
    transition: var(--transition);
}

.contact-item a:hover {
    color: var(--color-gradient-2);
}

/* Social Links */
.contact-social {
    display: flex;
    gap: 12px;
    margin-top: 12px;
}

.social-link {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    color: rgba(255,255,255,0.6);
    font-size: 1.1rem;
    transition: var(--transition);
}

.social-link:hover {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border-color: transparent;
    transform: translateY(-3px);
}

/* Contact Form */
.contact-form {
    background: var(--bg-card);
    border-radius: var(--radius-xl);
    padding: 36px;
    box-shadow: var(--shadow-xl);
}

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

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 6px;
    color: var(--text-primary);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    font-family: var(--font-sans);
    transition: var(--transition);
    background: var(--bg-secondary);
    color: var(--text-primary);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
    background: white;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-tertiary);
}

/* ========================================
   FOOTER
   ======================================== */
.footer {
    background: var(--bg-dark);
    color: rgba(255,255,255,0.7);
    padding: 60px 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255,255,255,0.08);
}

.footer-brand .logo .logo-title {
    color: white;
}

.footer-brand p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 8px;
}

.footer-company {
    font-weight: 600;
    color: rgba(255,255,255,0.5) !important;
}

.footer-links h4,
.footer-contact h4 {
    color: white;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 20px;
}

.footer-links ul,
.footer-contact ul {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

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

.footer-links a:hover {
    color: var(--color-gradient-2);
    padding-left: 4px;
}

.footer-contact li {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 0.9rem;
}

.footer-contact li i {
    margin-top: 4px;
    color: var(--color-gradient-2);
}

.footer-bottom {
    padding: 24px 0;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

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

.footer-bottom a:hover {
    color: var(--color-gradient-2);
}

.sep {
    margin: 0 8px;
    color: rgba(255,255,255,0.2);
}

/* ========================================
   BACK TO TOP
   ======================================== */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: white;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 15px rgba(37,99,235,0.3);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: 0 6px 25px rgba(37,99,235,0.5);
}

/* ========================================
   FADE-IN ANIMATION
   ======================================== */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ========================================
   RESPONSIVE
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
    .hero-title { font-size: 2.6rem; }
    .hero-container { gap: 40px; }
    .hero-stats { gap: 32px; }
    .stat-item + .stat-item::before { left: -16px; }

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

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

    .partners-logos { grid-template-columns: repeat(3, 1fr); }

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

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

/* Mobile */
@media (max-width: 768px) {
    .section { --section-padding: 70px 0; }
    .section-title { font-size: 1.8rem; }
    .section-header { margin-bottom: 40px; }

    /* Navigation */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: var(--bg-primary);
        box-shadow: -10px 0 40px rgba(0,0,0,0.1);
        padding: 80px 32px 32px;
        transition: right 0.3s ease;
        z-index: 999;
    }

    .nav.open { right: 0; }

    .nav-list {
        flex-direction: column;
        gap: 8px;
    }

    .nav-link {
        display: block;
        padding: 12px 16px;
        border-radius: var(--radius-sm);
        font-size: 1.05rem;
    }

    .nav-link:hover {
        background: var(--bg-secondary);
    }

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

    .menu-toggle { display: flex; }

    .header-actions .btn-sm { display: none; }

    /* Hero */
    .hero {
        min-height: auto;
        padding: 120px 0 60px;
    }

    .hero-container {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .hero-title { font-size: 2rem; }
    .hero-desc { max-width: 100%; margin-left: auto; margin-right: auto; }
    .hero-actions { justify-content: center; flex-wrap: wrap; }
    .hero-stats { justify-content: center; flex-wrap: wrap; gap: 24px; }
    .stat-item + .stat-item::before { display: none; }

    .hero-visual { display: none; }

    .hero-wave svg { height: 40px; }

    /* About */
    .about-grid,
    .advantages-grid { grid-template-columns: 1fr; }

    .about-company {
        grid-template-columns: 1fr;
        gap: 30px;
        padding: 28px;
    }

    /* Services */
    .services-grid { grid-template-columns: 1fr; }

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

    .cases-filter { gap: 8px; }
    .case-filter-btn {
        padding: 6px 16px;
        font-size: 0.85rem;
    }

    /* Partners */
    .partners-logos { grid-template-columns: repeat(3, 1fr); gap: 16px; }

    /* Process */
    .step-number { width: 44px; height: 44px; font-size: 0.95rem; }
    .process-connector { margin-left: 21px; }

    /* Contact */
    .contact-grid { gap: 30px; }
    .contact-form { padding: 24px; }
    .form-row { grid-template-columns: 1fr; }

    /* Footer */
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .footer-bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title { font-size: 1.7rem; }
    .hero-stats { gap: 16px; }
    .stat-number { font-size: 1.5rem; }

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

    .contact-form { padding: 20px; }
}