/* ============================================
   朔珩科技 - Soohen Tech
   Main Stylesheet
   Color Palette: Minimal Electric Blue (极简电光蓝)
   ============================================ */

/* ---------- CSS Custom Properties ---------- */
:root {
    /* Brand Colors - Electric Blue Palette */
    --color-primary: #0ea5e9;
    --color-primary-light: #38bdf8;
    --color-primary-dark: #0284c7;
    --color-secondary: #06b6d4;
    --color-secondary-light: #22d3ee;
    --color-accent-warm: #0284c7;
    --color-accent-emerald: #22d3ee;

    /* Neutrals */
    --color-bg: #0a0e1a;
    --color-bg-elevated: #111827;
    --color-bg-card: rgba(17, 24, 39, 0.8);
    --color-surface: #1e293b;
    --color-border: rgba(14, 165, 233, 0.18);
    --color-border-hover: rgba(14, 165, 233, 0.38);

    /* Text */
    --color-text: #f1f5f9;
    --color-text-secondary: #94a3b8;
    --color-text-muted: #64748b;

    /* Gradients - Sky → Cyan Electric Blue */
    --gradient-brand: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 50%, #06b6d4 100%);
    --gradient-brand-reverse: linear-gradient(135deg, #06b6d4 0%, #0ea5e9 60%, #38bdf8 100%);
    --gradient-hero: radial-gradient(ellipse at 30% 20%, rgba(56, 189, 248, 0.12) 0%, transparent 50%),
                                radial-gradient(ellipse at 70% 80%, rgba(6, 182, 212, 0.08) 0%, transparent 50%);
    --gradient-card: linear-gradient(145deg, rgba(14, 165, 233, 0.08) 0%, rgba(6, 182, 212, 0.04) 100%);
    --gradient-glow: radial-gradient(circle, rgba(14, 165, 233, 0.25) 0%, transparent 70%);

    /* Typography */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', monospace;

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    --space-4xl: 6rem;

    /* Layout */
    --container-max: 1200px;
    --container-padding: 1.5rem;
    --header-height: 72px;

    /* Borders & Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.4);
    --shadow-glow: 0 0 40px rgba(14, 165, 233, 0.15);
    --shadow-glow-lg: 0 0 80px rgba(14, 165, 233, 0.2);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--header-height);
    -webkit-text-size-adjust: 100%;
    font-size: 16px;
}

body {
    font-family: var(--font-sans);
    font-weight: 400;
    line-height: 1.7;
    color: var(--color-text);
    background-color: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

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

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

ul, ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
    color: inherit;
}

/* ---------- Utility Classes ---------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

.section {
    padding: var(--space-4xl) 0;
    position: relative;
}

.gradient-text {
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* ---------- Section Header ---------- */
.section__header {
    text-align: center;
    margin-bottom: var(--space-3xl);
}

.section__tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-primary-light);
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.2);
    padding: 0.35rem 1rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-md);
}

.section__title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    line-height: 1.2;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
}

.section__desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn--primary {
    background: var(--gradient-brand);
    color: #fff;
    box-shadow: 0 4px 16px rgba(14, 165, 233, 0.35);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 28px rgba(14, 165, 233, 0.45);
}

.btn--primary:active {
    transform: translateY(0);
}

.btn--ghost {
    background: transparent;
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn--ghost:hover {
    border-color: var(--color-border-hover);
    background: rgba(14, 165, 233, 0.08);
}

.btn--lg {
    padding: 0.9rem 2rem;
    font-size: 1rem;
}

.btn--xl {
    padding: 1.1rem 2.5rem;
    font-size: 1.05rem;
    border-radius: var(--radius-lg);
}

/* ============================================
   HEADER / NAVIGATION
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    height: var(--header-height);
    display: flex;
    align-items: center;
    background: rgba(10, 14, 26, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    transition: all var(--transition-base);
}

.header.scrolled {
    background: rgba(10, 14, 26, 0.95);
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 100%;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: 0.65rem;
    font-weight: 700;
    font-size: 1.15rem;
    z-index: 1001;
}

.nav__logo-img {
    width: 42px;
    height: 42px;
    object-fit: contain;
    border-radius: var(--radius-sm);
}

.nav__logo-text {
    font-size: 1.4rem;
    font-weight: 800;
    letter-spacing: 0.5px;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav__menu {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.nav__link {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
    position: relative;
}

.nav__link:hover,
.nav__link:focus-visible {
    color: var(--color-text);
    background: rgba(14, 165, 233, 0.08);
}

.nav__link--cta {
    background: var(--gradient-brand);
    color: #fff !important;
    padding: 0.5rem 1.25rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    margin-left: 0.5rem;
}

.nav__link--cta:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 14px rgba(14, 165, 233, 0.35);
}

/* Mobile Toggle */
.nav__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 32px;
    height: 32px;
    z-index: 1001;
    padding: 4px;
}

.nav__toggle-bar {
    display: block;
    width: 100%;
    height: 2px;
    background: var(--color-text);
    border-radius: 2px;
    transition: all var(--transition-base);
    transform-origin: center;
}

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

.nav__toggle.active .nav__toggle-bar:nth-child(2) {
    opacity: 0;
}

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

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    overflow: hidden;
    padding-top: var(--header-height);
}

.hero__bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero__gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    animation: float 20s ease-in-out infinite;
}

.hero__gradient-orb--1 {
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.35) 0%, transparent 70%);
    top: -10%;
    left: -10%;
    animation-delay: 0s;
}

.hero__gradient-orb--2 {
    width: 500px;
    height: 500px;
    background: radial-gradient(circle, rgba(6, 182, 212), 0.25) 0%, transparent 70%);
    bottom: -5%;
    right: -5%;
    animation-delay: -7s;
}

.hero__gradient-orb--3 {
    width: 350px;
    height: 350px;
    background: radial-gradient(circle, rgba(2, 132, 199, 0.2) 0%, transparent 70%);
    top: 40%;
    right: 20%;
    animation-delay: -14s;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) scale(1); }
    33% { transform: translate(30px, -30px) scale(1.05); }
    66% { transform: translate(-20px, 20px) scale(0.95); }
}

.hero__grid-overlay {
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(14, 165, 233, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(14, 165, 233, 0.03) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 30%, transparent 70%);
}

.hero__content {
    position: relative;
    z-index: 1;
    text-align: center;
    padding: var(--space-3xl) 0;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.82rem;
    font-weight: 500;
    color: var(--color-primary-light);
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.2);
    padding: 0.45rem 1.25rem;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out both;
}

.hero__badge-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent-green);
    border-radius: 50%;
    animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

.hero__title {
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 900;
    line-height: 1.1;
    letter-spacing: -0.03em;
    margin-bottom: var(--space-xl);
    animation: fadeInUp 0.6s ease-out 0.15s both;
}

.hero__subtitle {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--color-text-secondary);
    line-height: 1.8;
    max-width: 650px;
    margin: 0 auto var(--space-2xl);
    animation: fadeInUp 0.6s ease-out 0.3s both;
}

.hero__subtitle strong {
    color: var(--color-text);
}

/* Hero Stats */
.hero__stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    margin-bottom: var(--space-2xl);
    animation: fadeInUp 0.6s ease-out 0.45s both;
    flex-wrap: wrap;
}

.hero__stat {
    text-align: center;
}

.hero__stat-number {
    font-size: clamp(1.8rem, 4vw, 2.8rem);
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
}

.hero__stat-unit {
    font-size: clamp(1rem, 2vw, 1.4rem);
    font-weight: 700;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero__stat-label {
    display: block;
    font-size: 0.82rem;
    color: var(--color-text-muted);
    margin-top: 0.35rem;
}

.hero__stat-divider {
    width: 1px;
    height: 44px;
    background: var(--color-border);
}

/* Hero Actions */
.hero__actions {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    animation: fadeInUp 0.6s ease-out 0.55s both;
    flex-wrap: wrap;
}

/* Scroll Indicator */
.hero__scroll-indicator {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.72rem;
    color: var(--color-text-muted);
    letter-spacing: 0.1em;
    animation: fadeIn 1s ease-out 1s both;
}

.hero__scroll-line {
    width: 1px;
    height: 36px;
    background: linear-gradient(to bottom, var(--color-primary), transparent);
    animation: scroll-bounce 2s ease-in-out infinite;
}

@keyframes scroll-bounce {
    0%, 100% { transform: scaleY(1); opacity: 1; }
    50% { transform: scaleY(0.5); opacity: 0.5; }
}

/* ============================================
   ABOUT SECTION
   ============================================ */
.about__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-3xl);
    align-items: start;
}

.about__lead {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--color-text);
    margin-bottom: var(--space-lg);
    font-weight: 500;
}

.about__text {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.9;
}

.about__text strong {
    color: var(--color-text);
}

.about__features {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.about__feature {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--gradient-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    transition: all var(--transition-base);
}

.about__feature:hover {
    border-color: var(--color-border-hover);
    transform: translateX(4px);
}

.about__feature-icon {
    flex-shrink: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(14, 165, 233, 0.12);
    border-radius: var(--radius-sm);
    color: var(--color-primary-light);
}

.about__feature div {
    display: flex;
    flex-direction: column;
}

.about__feature strong {
    font-size: 0.95rem;
    margin-bottom: 0.15rem;
}

.about__feature span {
    font-size: 0.83rem;
    color: var(--color-text-muted);
}

/* About Visual Card */
.about__visual {
    position: sticky;
    top: calc(var(--header-height) + var(--space-xl));
}

.about__card {
    position: relative;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    padding: var(--space-2xl);
    backdrop-filter: blur(12px);
    overflow: hidden;
}

.about__card-glow {
    position: absolute;
    top: -50%;
    right: -30%;
    width: 300px;
    height: 300px;
    background: var(--gradient-glow);
    filter: blur(60px);
    pointer-events: none;
}

.about__card-content {
    position: relative;
    z-index: 1;
    text-align: center;
}

.about__card-icon {
    margin-bottom: var(--space-lg);
    display: flex;
    justify-content: center;
}

.about__card h3 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
}

.about__card p {
    color: var(--color-text-secondary);
    line-height: 1.8;
}

/* ============================================
   SERVICES SECTION
   ============================================ */
.services {
    position: relative;
    overflow: hidden;
}

.services__bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.services__gradient-blob {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.06) 0%, transparent 60%);
    pointer-events: none;
}

/* Tabs */
.services__tabs {
    display: flex;
    justify-content: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-2xl);
}

.services__tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.95rem;
    font-weight: 600;
    padding: 0.75rem 1.75rem;
    border-radius: var(--radius-full);
    border: 1px solid var(--color-border);
    color: var(--color-text-secondary);
    background: transparent;
    transition: all var(--transition-base);
}

.services__tab:hover {
    border-color: var(--color-border-hover);
    color: var(--color-text);
}

.services__tab.active {
    background: var(--gradient-brand);
    color: #fff;
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(14, 165, 233, 0.3);
}

/* Panel */
.services__panel {
    display: none;
    animation: fadeInUp 0.4s ease-out;
}

.services__panel.active {
    display: block;
}

.services__panel[hidden] {
    display: none;
}

.services__panel-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.services__panel-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.services__panel-header p {
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* Service Cards Grid */
.services__grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

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

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-brand);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.service-card:hover {
    border-color: var(--color-border-hover);
    transform: translateY(-4px);
    box-shadow: var(--shadow-glow);
}

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

.service-card__icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    margin-bottom: var(--space-lg);
}

.service-card__icon--purple {
    background: rgba(14, 165, 233, 0.12);
    color: var(--color-primary-light);
}

.service-card__icon--blue {
    background: rgba(6, 182, 212), 0.12);
    color: var(--color-secondary-light);
}

.service-card__icon--pink {
    background: rgba(2, 132, 199, 0.12);
    color: var(--color-accent-pink);
}

.service-card__title {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.service-card__desc {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

.service-card__tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.service-card__tags li {
    font-size: 0.75rem;
    padding: 0.25rem 0.65rem;
    background: rgba(14, 165, 233, 0.08);
    border: 1px solid rgba(14, 165, 233, 0.12);
    border-radius: var(--radius-full);
    color: var(--color-text-muted);
}

/* ============================================
   CASE STUDIES SECTION
   ============================================ */
.cases__grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
}

.case-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.case-card::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-hero);
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

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

.case-card:hover::after {
    opacity: 1;
}

.case-card--featured {
    grid-column: span 2;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(6, 182, 212), 0.04) 100%);
    border-color: rgba(14, 165, 233, 0.25);
}

.case-card--featured::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-brand);
}

.case-card__badge {
    position: absolute;
    top: var(--space-md);
    right: var(--space-md);
    font-size: 0.72rem;
    font-weight: 700;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    color: var(--color-primary-light);
    background: rgba(14, 165, 233, 0.15);
    border: 1px solid rgba(14, 165, 233, 0.25);
    padding: 0.3rem 0.75rem;
    border-radius: var(--radius-full);
    z-index: 1;
}

.case-card__header {
    display: flex;
    align-items: baseline;
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    position: relative;
    z-index: 1;
}

.case-card__brand {
    font-size: 1.4rem;
    font-weight: 800;
}

.case-card__category {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

/* Case Metrics */
.case-card__metrics {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
    margin-bottom: var(--space-lg);
    position: relative;
    z-index: 1;
}

.case-card__metric {
    text-align: center;
    padding: var(--space-md);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.04);
}

.case-card__metric-value {
    display: block;
    font-size: 1.4rem;
    font-weight: 800;
    background: var(--gradient-brand);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1.2;
}

.case-card__metric-label {
    display: block;
    font-size: 0.73rem;
    color: var(--color-text-muted);
    margin-top: 0.25rem;
}

.case-card__details {
    position: relative;
    z-index: 1;
}

.case-card__details p {
    font-size: 0.92rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-md);
}

.case-card__highlights {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.highlight-tag {
    font-size: 0.75rem;
    padding: 0.3rem 0.7rem;
    background: rgba(14, 165, 233, 0.1);
    border: 1px solid rgba(14, 165, 233, 0.18);
    border-radius: var(--radius-full);
    color: var(--color-primary-light);
}

/* ============================================
   ADVANTAGES SECTION
   ============================================ */
.advantages {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.advantages__grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
}

.advantage-card {
    text-align: center;
    padding: var(--space-xl);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    position: relative;
}

.advantage-card:hover {
    transform: translateY(-6px);
}

.advantage-card__number {
    font-size: 3rem;
    font-weight: 900;
    background: linear-gradient(135deg, rgba(14, 165, 233, 0.15) 0%, rgba(14, 165, 233, 0.03) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    line-height: 1;
    margin-bottom: var(--space-md);
}

.advantage-card__icon {
    display: flex;
    justify-content: center;
    margin-bottom: var(--space-lg);
}

.advantage-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.advantage-card p {
    font-size: 0.88rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}

/* ============================================
   CTA / CONTACT SECTION
   ============================================ */
.cta {
    position: relative;
    overflow: hidden;
    text-align: center;
}

.cta__bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.cta__glow {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
}

.cta__glow--1 {
    width: 500px;
    height: 500px;
    background: rgba(14, 165, 233, 0.15);
    top: -20%;
    left: 10%;
}

.cta__glow--2 {
    width: 400px;
    height: 400px;
    background: rgba(6, 182, 212), 0.1);
    bottom: -10%;
    right: 10%;
}

.cta__content {
    position: relative;
    z-index: 1;
}

.cta__title {
    font-size: clamp(1.75rem, 4vw, 2.75rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--space-lg);
}

.cta__desc {
    font-size: 1.05rem;
    color: var(--color-text-secondary);
    max-width: 580px;
    margin: 0 auto var(--space-2xl);
    line-height: 1.8;
}

.cta__actions {
    margin-bottom: var(--space-2xl);
}

.cta__info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.cta__info-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.cta__info-item svg {
    color: var(--color-primary-light);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background: var(--color-bg-elevated);
    border-top: 1px solid var(--color-border);
    padding-top: var(--space-3xl);
}

.footer__content {
    display: grid;
    grid-template-columns: 1.2fr 2fr;
    gap: var(--space-3xl);
    padding-bottom: var(--space-2xl);
}

.footer__logo {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-sm);
    margin-bottom: var(--space-md);
}

.footer__company {
    display: block;
    font-weight: 700;
    font-size: 1.05rem;
    margin-bottom: var(--space-sm);
}

.footer__tagline {
    font-size: 0.88rem;
    color: var(--color-text-muted);
    line-height: 1.6;
    max-width: 300px;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.footer__col h4 {
    font-size: 0.88rem;
    font-weight: 700;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}

.footer__col ul li {
    margin-bottom: 0.5rem;
}

.footer__col ul li a {
    font-size: 0.85rem;
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

.footer__col ul li a:hover {
    color: var(--color-primary-light);
}

.footer__bottom {
    border-top: 1px solid var(--color-border);
    padding: var(--space-lg) 0;
    text-align: center;
}

.footer__bottom p {
    font-size: 0.82rem;
    color: var(--color-text-muted);
}

.footer__icp {
    margin-top: 0.35rem;
}

.footer__icp a {
    color: var(--color-text-muted);
    transition: color var(--transition-fast);
}

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

/* ============================================
   BACK TO TOP
   ============================================ */
.back-to-top {
    position: fixed;
    right: 1.5rem;
    bottom: 1.5rem;
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-full);
    background: var(--gradient-brand);
    color: #fff;
    cursor: pointer;
    box-shadow: 0 10px 24px rgba(14, 165, 233, 0.35);
    opacity: 0;
    visibility: hidden;
    transform: translateY(12px);
    transition: opacity var(--transition-base), visibility var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
    z-index: 900;
}

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

.back-to-top:hover {
    box-shadow: 0 14px 30px rgba(14, 165, 233, 0.5);
    transform: translateY(-3px);
}

.back-to-top:focus-visible {
    outline: 2px solid #fff;
    outline-offset: 2px;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(24px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

/* Scroll-triggered animations */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

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

/* Tablet & Below */
@media (max-width: 1024px) {
    .services__grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

    .about__grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .about__visual {
        position: static;
    }
}

/* Mobile */
@media (max-width: 768px) {
    :root {
        --container-padding: 1.25rem;
        --header-height: 64px;
    }

    .section {
        padding: var(--space-3xl) 0;
    }

    /* Nav Mobile */
    .nav__toggle {
        display: flex;
    }

    .nav__menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: min(320px, 85vw);
        height: 100vh;
        background: rgba(10, 14, 26, 0.98);
        backdrop-filter: blur(24px);
        flex-direction: column;
        align-items: stretch;
        padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
        gap: var(--space-xs);
        transition: right var(--transition-slow);
        border-left: 1px solid var(--color-border);
        z-index: 1000;
    }

    .nav__menu.open {
        right: 0;
    }

    .nav__link {
        font-size: 1.05rem;
        padding: 0.85rem 1rem;
        border-radius: var(--radius-md);
    }

    .nav__link--cta {
        margin-left: 0;
        margin-top: var(--space-md);
        text-align: center;
    }

    /* Hero Mobile */
    .hero__stats {
        gap: var(--space-lg);
    }

    .hero__stat-divider {
        display: none;
    }

    .hero__actions {
        flex-direction: column;
        width: 100%;
    }

    .hero__actions .btn {
        width: 100%;
    }

    .hero__scroll-indicator {
        display: none;
    }

    /* Services Mobile */
    .services__tabs {
        flex-direction: column;
        align-items: stretch;
    }

    .services__tab {
        justify-content: center;
    }

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

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

    .case-card--featured {
        grid-column: span 1;
    }

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

    /* Advantages Mobile */
    .advantages__grid {
        grid-template-columns: 1fr;
    }

    /* Footer Mobile */
    .footer__content {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

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

    /* CTA Mobile */
    .cta__info {
        flex-direction: column;
        gap: var(--space-md);
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero__title {
        font-size: 2rem;
    }

    .section__title {
        font-size: 1.5rem;
    }

    .case-card__metrics {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }

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

    .back-to-top {
        right: 1rem;
        bottom: 1rem;
        width: 44px;
        height: 44px;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }

    html {
        scroll-behavior: auto;
    }

    .reveal {
        opacity: 1;
        transform: none;
    }
}

/* Print Styles */
@media print {
    .header,
    .hero__scroll-indicator,
    .hero__bg,
    .services__bg,
    .cta__bg {
        display: none;
    }

    body {
        background: #fff;
        color: #000;
    }

    .section {
        padding: 2rem 0;
    }
}