/* ============================================================
   MSP — Multi-Service Platform
   Mobile-First Responsive Stylesheet
   Breakpoints: ≥320px (base), ≥768px (tablet), ≥1280px (desktop)
   ============================================================ */

/* --- CSS Variables / Design Tokens --- */
:root {
    /* Colors */
    --color-primary: #1a73e8;
    --color-primary-dark: #1557b0;
    --color-primary-light: #e8f0fe;
    --color-primary-50: #eff6ff;
    --color-secondary: #0f172a;
    --color-accent: #f97316;
    --color-success: #16a34a;
    --color-error: #dc2626;
    --color-warning: #f59e0b;

    /* Neutrals */
    --color-white: #ffffff;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-gray-800: #1e293b;
    --color-gray-900: #0f172a;

    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-size-xs: 0.75rem;    /* 12px */
    --font-size-sm: 0.875rem;   /* 14px */
    --font-size-base: 1rem;     /* 16px */
    --font-size-lg: 1.125rem;   /* 18px */
    --font-size-xl: 1.25rem;    /* 20px */
    --font-size-2xl: 1.5rem;    /* 24px */
    --font-size-3xl: 1.875rem;  /* 30px */
    --font-size-4xl: 2.25rem;   /* 36px */
    --font-size-5xl: 3rem;      /* 48px */

    /* Spacing */
    --spacing-xs: 0.25rem;      /* 4px */
    --spacing-sm: 0.5rem;       /* 8px */
    --spacing-md: 1rem;         /* 16px */
    --spacing-lg: 1.5rem;       /* 24px */
    --spacing-xl: 2rem;         /* 32px */
    --spacing-2xl: 3rem;        /* 48px */
    --spacing-3xl: 4rem;        /* 64px */

    /* Borders & Radius */
    --radius-sm: 0.375rem;      /* 6px */
    --radius-md: 0.5rem;        /* 8px */
    --radius-lg: 0.75rem;       /* 12px */
    --radius-xl: 1rem;          /* 16px */
    --radius-2xl: 1.5rem;       /* 24px */
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);

    /* Layout */
    --container-max: 1200px;
    --header-height: 56px;

    /* Touch target minimum (WCAG 2.1 AA) */
    --touch-target-min: 44px;
}

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

html {
    font-size: 100%;
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* Focus styles for keyboard navigation */
:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 3px;
    border-radius: var(--radius-sm);
}

input:focus-visible,
button:focus-visible,
a:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Skip to main content */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: 0 0 var(--radius-md) var(--radius-md);
    z-index: 9999;
    font-weight: 600;
    text-decoration: none;
    transition: top var(--transition-base);
}

.skip-link:focus {
    top: 0;
}

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

a {
    color: inherit;
    text-decoration: none;
}

ul {
    list-style: none;
}

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

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: var(--touch-target-min);
    padding: 0.625rem var(--spacing-lg);
    font-family: var(--font-family);
    font-size: var(--font-size-sm);
    font-weight: 600;
    line-height: 1;
    text-decoration: none;
    border: 2px solid transparent;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
    user-select: none;
}

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

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

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

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

.btn-outline:hover {
    background-color: var(--color-primary-light);
}

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

.btn-white:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-100);
}

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

.btn-outline-light:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

.btn-text {
    background-color: transparent;
    color: var(--color-primary);
    border-color: transparent;
    padding-left: 0;
    padding-right: 0;
}

.btn-text:hover {
    color: var(--color-primary-dark);
}

.btn-sm {
    min-height: 36px;
    padding: 0.5rem var(--spacing-md);
    font-size: var(--font-size-xs);
    border-radius: var(--radius-md);
}

/* ============================================================
   HEADER
   ============================================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 100;
    background-color: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-200);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: var(--header-height);
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-weight: 700;
    font-size: var(--font-size-lg);
    color: var(--color-secondary);
    text-decoration: none;
}

.logo-icon {
    color: var(--color-primary);
    font-size: var(--font-size-xl);
}

.logo-text {
    letter-spacing: 0.02em;
}

/* Navigation */
.header-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.nav-link {
    display: inline-flex;
    align-items: center;
    min-height: var(--touch-target-min);
    padding: 0 var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-600);
    border-radius: var(--radius-md);
    transition: color var(--transition-fast), background var(--transition-fast);
}

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

.nav-link--accent {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: 0 var(--spacing-md);
    border-radius: var(--radius-lg);
    font-weight: 600;
}

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

/* ============================================================
   HERO SECTION
   ============================================================ */
.hero {
    position: relative;
    padding: var(--spacing-2xl) 0 var(--spacing-2xl);
    overflow: hidden;
}

.hero .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-2xl);
}

.hero-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-lg);
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    padding: 0.375rem var(--spacing-md);
    background-color: var(--color-primary-50);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.hero-title {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    line-height: 1.15;
    color: var(--color-secondary);
    letter-spacing: -0.02em;
}

.hero-title-highlight {
    color: var(--color-primary);
}

.hero-description {
    max-width: 540px;
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    line-height: 1.7;
}

.hero-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* Hero Illustration */
.hero-illustration {
    position: relative;
    width: 100%;
    max-width: 340px;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero-pulse-ring {
    position: absolute;
    border-radius: 50%;
    border: 2px solid var(--color-primary);
    opacity: 0.15;
    animation: pulse-ring 3s ease-out infinite;
}

.ring-1 {
    width: 100%;
    height: 100%;
    animation-delay: 0s;
}

.ring-2 {
    width: 70%;
    height: 70%;
    animation-delay: 1s;
}

.ring-3 {
    width: 40%;
    height: 40%;
    animation-delay: 2s;
}

@keyframes pulse-ring {
    0% {
        transform: scale(0.9);
        opacity: 0.25;
    }
    100% {
        transform: scale(1.05);
        opacity: 0;
    }
}

.hero-icon-grid {
    position: relative;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-sm);
    z-index: 1;
}

.hero-icon-grid-item {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 52px;
    height: 52px;
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    font-size: var(--font-size-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-base);
    animation: float-icon 4s ease-in-out infinite;
}

.hero-icon-grid-item:nth-child(1) { animation-delay: 0s; }
.hero-icon-grid-item:nth-child(2) { animation-delay: 0.3s; }
.hero-icon-grid-item:nth-child(3) { animation-delay: 0.6s; }
.hero-icon-grid-item:nth-child(4) { animation-delay: 0.9s; }
.hero-icon-grid-item:nth-child(5) { animation-delay: 1.2s; }
.hero-icon-grid-item:nth-child(6) { animation-delay: 1.5s; }
.hero-icon-grid-item:nth-child(7) { animation-delay: 1.8s; }
.hero-icon-grid-item:nth-child(8) { animation-delay: 2.1s; }

@keyframes float-icon {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

/* ============================================================
   STATS BAR
   ============================================================ */
.stats-bar {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    padding: var(--spacing-xl) 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-lg);
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: var(--spacing-xs);
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 800;
    color: var(--color-white);
    line-height: 1;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* ============================================================
   SECTIONS - Shared
   ============================================================ */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-tag {
    display: inline-block;
    padding: 0.25rem var(--spacing-md);
    background-color: var(--color-primary-50);
    color: var(--color-primary);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.section-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    color: var(--color-secondary);
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-description {
    max-width: 520px;
    margin: var(--spacing-md) auto 0;
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
    line-height: 1.7;
}

/* ============================================================
   SERVICES SECTION
   ============================================================ */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-50);
}

.services-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-md);
}

/* Service Card */
.service-card {
    position: relative;
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    text-decoration: none;
    color: inherit;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    cursor: pointer;
    min-height: var(--touch-target-min);
}

.service-card:active {
    transform: scale(0.98);
}

.service-card:hover {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.service-card::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: var(--radius-xl);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.service-card:focus-visible::after {
    opacity: 1;
}

.service-card-icon-wrapper {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: var(--color-primary-50);
    border-radius: var(--radius-lg);
}

.service-card-icon {
    font-size: var(--font-size-2xl);
    line-height: 1;
}

.service-card-content {
    flex: 1;
    min-width: 0;
}

.service-card-title {
    font-size: var(--font-size-base);
    font-weight: 700;
    color: var(--color-secondary);
    margin-bottom: var(--spacing-xs);
}

.service-card-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: 1.5;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.service-card-arrow {
    flex-shrink: 0;
    display: flex;
    align-items: center;
    color: var(--color-gray-400);
    transition: transform var(--transition-fast), color var(--transition-fast);
}

.service-card:hover .service-card-arrow,
.service-card:focus-visible .service-card-arrow {
    transform: translateX(4px);
    color: var(--color-primary);
}

/* Vendor card highlight */
.service-card--vendor {
    border-color: var(--color-accent);
    background: linear-gradient(135deg, var(--color-white), #fff7ed);
}

.service-card--vendor .service-card-icon-wrapper {
    background-color: #fff7ed;
}

.service-card--vendor:hover {
    border-color: var(--color-accent);
}

/* ============================================================
   ABOUT SECTION
   ============================================================ */
.about {
    padding: var(--spacing-3xl) 0;
}

.about-grid {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.about-content .section-tag {
    align-self: flex-start;
}

.about-text {
    font-size: var(--font-size-base);
    color: var(--color-gray-600);
    line-height: 1.7;
    max-width: 520px;
}

.about-features {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.about-feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-sm);
    font-weight: 500;
    color: var(--color-gray-700);
}

.about-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-sm);
}

/* About Visual - Card Stack */
.about-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-card-stack {
    position: relative;
    width: 200px;
    height: 240px;
}

.about-card {
    position: absolute;
    width: 160px;
    height: 180px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-slow);
}

.about-card-1 {
    top: 0;
    left: 0;
    z-index: 3;
}

.about-card-2 {
    top: 20px;
    left: 30px;
    z-index: 2;
}

.about-card-3 {
    top: 40px;
    left: 60px;
    z-index: 1;
}

.about-card-emoji {
    font-size: var(--font-size-3xl);
}

.about-card-label {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-gray-600);
}

/* ============================================================
   CTA SECTION
   ============================================================ */
.cta {
    padding: var(--spacing-3xl) 0;
}

.cta-card {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary));
    padding: var(--spacing-2xl) var(--spacing-lg);
    border-radius: var(--radius-2xl);
    text-align: center;
    color: var(--color-white);
}

.cta-title {
    font-size: var(--font-size-2xl);
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    letter-spacing: -0.02em;
}

.cta-description {
    max-width: 500px;
    margin: 0 auto var(--spacing-xl);
    font-size: var(--font-size-base);
    opacity: 0.9;
    line-height: 1.7;
}

.cta-actions {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
    background-color: var(--color-secondary);
    color: var(--color-gray-300);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-white);
}

.footer-tagline {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
}

.footer-heading {
    font-size: var(--font-size-sm);
    font-weight: 700;
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.footer-links {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.footer-links a {
    font-size: var(--font-size-sm);
    color: var(--color-gray-400);
    transition: color var(--transition-fast);
}

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

.footer-bottom {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-700);
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
    text-align: center;
}

.footer-bottom-tag {
    color: var(--color-gray-400);
}

/* ============================================================
   INSTALL TOAST
   ============================================================ */
.install-toast {
    position: fixed;
    bottom: var(--spacing-md);
    left: var(--spacing-md);
    right: var(--spacing-md);
    z-index: 999;
    background: var(--color-white);
    border: 1px solid var(--color-gray-200);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: slide-up var(--transition-slow);
}

.install-toast[hidden] {
    display: none;
}

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

.install-toast-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
}

.install-toast-icon {
    font-size: var(--font-size-2xl);
    flex-shrink: 0;
}

.install-toast-text {
    flex: 1;
    min-width: 0;
}

.install-toast-text strong {
    display: block;
    font-size: var(--font-size-sm);
    color: var(--color-secondary);
}

.install-toast-text span {
    display: block;
    font-size: var(--font-size-xs);
    color: var(--color-gray-500);
}

.install-toast-close {
    flex-shrink: 0;
    width: var(--touch-target-min);
    height: var(--touch-target-min);
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    font-size: var(--font-size-xl);
    color: var(--color-gray-400);
    cursor: pointer;
    border-radius: var(--radius-md);
    transition: color var(--transition-fast);
    -webkit-tap-highlight-color: transparent;
}

.install-toast-close:hover {
    color: var(--color-gray-600);
}

/* ============================================================
   OFFLINE INDICATOR
   ============================================================ */
.offline-indicator {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    z-index: 99;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--color-warning);
    color: var(--color-white);
    font-size: var(--font-size-xs);
    font-weight: 600;
    animation: slide-down var(--transition-base);
}

.offline-indicator[hidden] {
    display: none;
}

@keyframes slide-down {
    from {
        transform: translateY(-100%);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.offline-indicator-dot {
    width: 8px;
    height: 8px;
    background-color: var(--color-white);
    border-radius: 50%;
    animation: blink-dot 1s ease-in-out infinite;
}

@keyframes blink-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.3; }
}

/* ============================================================
   RESPONSIVE - TABLET (≥768px)
   ============================================================ */
@media (min-width: 768px) {
    :root {
        --header-height: 64px;
    }

    .container {
        padding: 0 var(--spacing-xl);
    }

    /* Hero */
    .hero {
        padding: var(--spacing-3xl) 0;
    }

    .hero-title {
        font-size: var(--font-size-4xl);
    }

    .hero-description {
        font-size: var(--font-size-lg);
    }

    .hero-illustration {
        max-width: 380px;
    }

    .hero-icon-grid-item {
        width: 64px;
        height: 64px;
        font-size: var(--font-size-2xl);
    }

    /* Stats */
    .stats-grid {
        grid-template-columns: repeat(4, 1fr);
    }

    .stat-number {
        font-size: var(--font-size-4xl);
    }

    /* Section titles */
    .section-title {
        font-size: var(--font-size-3xl);
    }

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

    /* About */
    .about-grid {
        flex-direction: row;
        align-items: center;
    }

    .about-content {
        flex: 1;
    }

    .about-visual {
        flex: 1;
        justify-content: flex-end;
    }

    .about-card-stack {
        width: 240px;
        height: 280px;
    }

    .about-card {
        width: 180px;
        height: 200px;
    }

    /* CTA */
    .cta-card {
        padding: var(--spacing-3xl);
    }

    .cta-title {
        font-size: var(--font-size-3xl);
    }

    /* Footer */
    .footer-grid {
        grid-template-columns: 2fr 1fr 1fr 1fr;
    }

    .footer-bottom {
        flex-direction: row;
        justify-content: space-between;
    }
}

/* ============================================================
   RESPONSIVE - DESKTOP (≥1280px)
   ============================================================ */
@media (min-width: 1280px) {
    /* Hero */
    .hero .container {
        flex-direction: row;
        text-align: left;
        gap: var(--spacing-3xl);
    }

    .hero-content {
        flex: 1;
        align-items: flex-start;
    }

    .hero-title {
        font-size: var(--font-size-5xl);
    }

    .hero-actions {
        justify-content: flex-start;
    }

    .hero-illustration {
        flex: 1;
        max-width: 460px;
    }

    .hero-icon-grid-item {
        width: 72px;
        height: 72px;
        font-size: var(--font-size-3xl);
    }

    /* Services */
    .services {
        padding: var(--spacing-3xl) 0;
    }

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

    .service-card:last-child {
        grid-column: 1 / -1;
        max-width: 400px;
        margin: 0 auto;
    }

    /* About */
    .section-title {
        font-size: var(--font-size-4xl);
    }

    .about-card-stack {
        width: 280px;
        height: 320px;
    }

    .about-card {
        width: 200px;
        height: 220px;
    }
}

/* ============================================================
   RESPONSIVE - LARGE DESKTOP (≥1440px)
   ============================================================ */
@media (min-width: 1440px) {
    .hero-illustration {
        max-width: 500px;
    }

    .hero-icon-grid-item {
        width: 80px;
        height: 80px;
        font-size: var(--font-size-3xl);
    }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
}

/* ============================================================
   PRINT STYLES
   ============================================================ */
@media print {
    .header,
    .install-toast,
    .offline-indicator,
    .hero-illustration {
        display: none !important;
    }
}