/* ============================================
   Yugma - Digital Business Cards
   Premium Static Website Stylesheet
   ============================================ */

/* ============================================
   CSS VARIABLES - Easy to modify
   ============================================ */
:root {
    /* Colors */
    --color-primary: #A334E6;
    --color-primary-dark: #8528c4;
    --color-primary-light: #b856ed;
    --color-black: #000000;
    --color-white: #ffffff;
    --color-gray-100: #f8f9fa;
    --color-gray-200: #e9ecef;
    --color-gray-300: #dee2e6;
    --color-gray-400: #ced4da;
    --color-gray-500: #adb5bd;
    --color-gray-600: #6c757d;
    --color-gray-700: #495057;
    --color-gray-800: #343a40;
    --color-gray-900: #212529;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-heading: 'Poppins', sans-serif;

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

    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition: all 0.3s ease;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-primary);
    color: var(--color-gray-800);
    line-height: 1.6;
    background-color: var(--color-white);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    color: var(--color-black);
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

p {
    margin-bottom: var(--spacing-sm);
}

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

ul {
    list-style: none;
}

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

/* ============================================
   CONTAINER & LAYOUT
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    font-family: var(--font-primary);
}

.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);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background-color: var(--color-gray-100);
    border-color: var(--color-gray-400);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.125rem;
}

.btn-block {
    display: block;
    width: 100%;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */
.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background-color: var(--color-white);
    box-shadow: var(--shadow-sm);
}

.navbar {
    padding: var(--spacing-sm) 0;
}

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

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-black);
}

.logo-img {
    width: 60px;
    height: 60px;
    /* Placeholder for square logo PNG */
    background-color: var(--color-primary);
    border-radius: var(--radius-md);
}

.logo-text {
    font-family: var(--font-heading);
}

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

.nav-links a {
    font-weight: 500;
    color: var(--color-gray-700);
    position: relative;
}

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

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: width 0.3s ease;
}

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

.nav-cta {
    display: flex;
    gap: var(--spacing-sm);
}

/* Mobile Menu Toggle */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--color-black);
    transition: var(--transition);
}

/* Mobile Menu */
.mobile-menu {
    display: none;
    background-color: var(--color-white);
    box-shadow: var(--shadow-md);
}

.mobile-menu.active {
    display: block;
}

.mobile-nav-links {
    padding: var(--spacing-md);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.mobile-nav-links a {
    padding: var(--spacing-sm);
    color: var(--color-gray-700);
    font-weight: 500;
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(135deg, var(--color-gray-100) 0%, var(--color-white) 100%);
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
}

.hero-text {
    animation: fadeInUp 0.8s ease-out;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--color-black) 0%, var(--color-gray-700) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.5rem;
    color: var(--color-primary);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.hero-description {
    font-size: 1.125rem;
    color: var(--color-gray-600);
    margin-bottom: var(--spacing-lg);
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* Hero Visual */
.hero-visual {
    position: relative;
    height: 500px;
    display: flex;
    align-items: center;
    justify-content: center;
    perspective: 1500px;
}

.card-mockup {
    width: 350px;
    height: 450px;
    position: relative;
    transform-style: preserve-3d;
    animation: float3D 4s ease-in-out infinite;
}

/* Animated Phone */
.card-mockup::before {
    content: '';
    position: absolute;
    width: 200px;
    height: 400px;
    background: linear-gradient(135deg, #1a1a1a 0%, #2d2d2d 100%);
    border-radius: 30px;
    top: 50%;
    left: -50px;
    transform: translateY(-50%) rotateY(-15deg) rotateX(5deg);
    box-shadow:
        0 20px 60px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.1);
    animation: phoneFloat 4s ease-in-out infinite;
    z-index: 2;
}

/* Phone Screen */
.card-mockup::after {
    content: '';
    position: absolute;
    width: 180px;
    height: 360px;
    background: linear-gradient(135deg, #A334E6 0%, #8528c4 100%);
    border-radius: 20px;
    top: 50%;
    left: -40px;
    transform: translateY(-50%) rotateY(-15deg) rotateX(5deg) translateZ(2px);
    box-shadow:
        0 10px 40px rgba(163, 52, 230, 0.3),
        inset 0 0 20px rgba(255, 255, 255, 0.1);
    animation: screenGlow 2s ease-in-out infinite alternate;
    z-index: 3;
}

/* Business Card - 3D */
.hero-visual .card-mockup {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: 20px;
    box-shadow:
        0 30px 80px rgba(163, 52, 230, 0.4),
        0 0 0 1px rgba(255, 255, 255, 0.1);
    transform-style: preserve-3d;
}

/* NFC Wave Effect */
.hero-visual::before {
    content: '';
    position: absolute;
    width: 150px;
    height: 150px;
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-80%, -50%);
    animation: nfcPulse 2s ease-out infinite;
    opacity: 0;
}

.hero-visual::after {
    content: '';
    position: absolute;
    width: 150px;
    height: 150px;
    border: 3px solid var(--color-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-80%, -50%);
    animation: nfcPulse 2s ease-out infinite 0.5s;
    opacity: 0;
}

/* Animations */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes float3D {
    0%, 100% {
        transform: translateY(0) rotateY(10deg) rotateX(-5deg);
    }
    50% {
        transform: translateY(-20px) rotateY(15deg) rotateX(-8deg);
    }
}

@keyframes phoneFloat {
    0%, 100% {
        transform: translateY(-50%) rotateY(-15deg) rotateX(5deg) translateX(0);
    }
    50% {
        transform: translateY(-50%) rotateY(-15deg) rotateX(5deg) translateX(-5px);
    }
}

@keyframes screenGlow {
    from {
        box-shadow:
            0 10px 40px rgba(163, 52, 230, 0.3),
            inset 0 0 20px rgba(255, 255, 255, 0.1);
    }
    to {
        box-shadow:
            0 10px 60px rgba(163, 52, 230, 0.6),
            inset 0 0 30px rgba(255, 255, 255, 0.2);
    }
}

@keyframes nfcPulse {
    0% {
        transform: translate(-80%, -50%) scale(0.5);
        opacity: 0.8;
    }
    100% {
        transform: translate(-80%, -50%) scale(1.5);
        opacity: 0;
    }
}

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

.section-title {
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--color-gray-600);
}

/* ============================================
   PRODUCT HIGHLIGHTS SECTION
   ============================================ */
.product-highlights {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.highlights-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.highlight-card {
    padding: var(--spacing-lg);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-lg);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    text-align: center;
    transform-style: preserve-3d;
    position: relative;
}

.highlight-card:hover {
    transform: translateY(-10px) rotateX(5deg) scale(1.05);
    box-shadow:
        0 25px 50px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(163, 52, 230, 0.1);
    background-color: var(--color-white);
}

.highlight-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(163, 52, 230, 0.05) 0%, transparent 100%);
    border-radius: var(--radius-lg);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

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

.highlight-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border-radius: var(--radius-lg);
    transition: all 0.4s ease;
    transform-style: preserve-3d;
    box-shadow: 0 10px 30px rgba(163, 52, 230, 0.3);
}

.highlight-card:hover .highlight-icon {
    transform: translateZ(20px) rotateY(10deg);
    box-shadow: 0 15px 40px rgba(163, 52, 230, 0.5);
}

.highlight-icon svg {
    transition: transform 0.4s ease;
}

.highlight-card:hover .highlight-icon svg {
    transform: scale(1.1) rotateZ(5deg);
}

.highlight-title {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

.highlight-description {
    color: var(--color-gray-600);
}

/* ============================================
   HOW IT WORKS SECTION
   ============================================ */
.how-it-works {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-100);
}

.steps-container {
    display: grid;
    gap: var(--spacing-xl);
}

.step {
    display: grid;
    grid-template-columns: 100px 1fr;
    gap: var(--spacing-lg);
    align-items: start;
    transform-style: preserve-3d;
    transition: all 0.3s ease;
}

.step-number {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    font-size: 2rem;
    font-weight: 700;
    border-radius: var(--radius-lg);
    font-family: var(--font-heading);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
    box-shadow: 0 15px 40px rgba(163, 52, 230, 0.4);
    position: relative;
}

.step:hover .step-number {
    transform: rotateY(360deg) scale(1.1);
    box-shadow: 0 20px 60px rgba(163, 52, 230, 0.6);
}

.step-number::before {
    content: '';
    position: absolute;
    inset: -5px;
    border-radius: var(--radius-lg);
    padding: 2px;
    background: linear-gradient(135deg, var(--color-primary-light), var(--color-primary));
    -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.5s ease;
}

.step:hover .step-number::before {
    opacity: 0.8;
}

.step-title {
    margin-bottom: var(--spacing-sm);
}

.step-description {
    font-size: 1.125rem;
    color: var(--color-gray-600);
}

/* ============================================
   FEATURES DETAILED SECTION
   ============================================ */
.features-detailed {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.features-list {
    display: grid;
    gap: var(--spacing-md);
}

.feature-item {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-lg);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
    position: relative;
}

.feature-item:hover {
    background-color: var(--color-white);
    box-shadow:
        0 15px 40px rgba(0, 0, 0, 0.1),
        0 0 0 1px rgba(163, 52, 230, 0.1);
    transform: translateX(10px) rotateY(-2deg);
}

.feature-item::after {
    content: '';
    position: absolute;
    right: 20px;
    top: 50%;
    transform: translateY(-50%);
    width: 6px;
    height: 6px;
    background-color: var(--color-primary);
    border-radius: 50%;
    opacity: 0;
    transition: all 0.4s ease;
}

.feature-item:hover::after {
    opacity: 1;
    transform: translateY(-50%) translateX(5px);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border-radius: var(--radius-md);
    flex-shrink: 0;
    transition: all 0.4s ease;
    transform-style: preserve-3d;
    box-shadow: 0 8px 20px rgba(163, 52, 230, 0.3);
}

.feature-item:hover .feature-icon {
    transform: translateZ(10px) rotateY(10deg) scale(1.1);
    box-shadow: 0 12px 30px rgba(163, 52, 230, 0.5);
}

.feature-text {
    flex: 1;
}

.feature-title {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-xs);
}

.feature-description {
    color: var(--color-gray-600);
}

/* ============================================
   COMPARISON SECTION
   ============================================ */
.comparison {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-100);
}

.comparison-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

.comparison-table {
    width: 100%;
    background-color: var(--color-white);
    border-collapse: collapse;
}

.comparison-table th,
.comparison-table td {
    padding: var(--spacing-md);
    text-align: center;
    border-bottom: 1px solid var(--color-gray-200);
}

.comparison-table thead {
    background-color: var(--color-black);
    color: var(--color-white);
}

.comparison-table thead th {
    font-size: 1.125rem;
    font-weight: 600;
}

.feature-col {
    text-align: left;
    font-weight: 600;
}

.yugma-col {
    background-color: var(--color-primary);
}

.feature-name {
    font-weight: 500;
    text-align: left;
}

.check {
    color: #10b981;
    font-size: 1.5rem;
    font-weight: 700;
}

.check.highlight {
    color: var(--color-primary);
    font-size: 1.75rem;
}

.cross {
    color: var(--color-gray-400);
    font-size: 1.5rem;
}

/* ============================================
   PRICING SECTION
   ============================================ */
.pricing {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-white);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.pricing-card {
    padding: var(--spacing-xl);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-xl);
    border: 2px solid var(--color-gray-200);
    transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
    transform-style: preserve-3d;
    perspective: 1000px;
}

.pricing-card:hover {
    transform: translateY(-15px) rotateX(5deg) scale(1.03);
    box-shadow:
        0 30px 80px rgba(0, 0, 0, 0.2),
        0 0 0 1px rgba(163, 52, 230, 0.2);
    border-color: var(--color-primary);
}

.pricing-card::after {
    content: '';
    position: absolute;
    top: -2px;
    left: -2px;
    right: -2px;
    bottom: -2px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-light) 100%);
    border-radius: var(--radius-xl);
    opacity: 0;
    transition: opacity 0.5s ease;
    z-index: -1;
}

.pricing-card:hover::after {
    opacity: 0.1;
}

.pricing-card-featured {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    border-color: var(--color-primary);
    box-shadow: 0 20px 60px rgba(163, 52, 230, 0.4);
}

.pricing-card-featured:hover {
    transform: translateY(-20px) rotateX(8deg) scale(1.05);
    box-shadow:
        0 40px 100px rgba(163, 52, 230, 0.5),
        0 0 60px rgba(163, 52, 230, 0.3);
}

.pricing-card-featured .plan-name,
.pricing-card-featured .plan-description,
.pricing-card-featured .pricing-price,
.pricing-card-featured .pricing-features {
    color: var(--color-white);
}

.badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--color-black);
    color: var(--color-white);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.plan-name {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-xs);
}

.plan-description {
    color: var(--color-gray-600);
}

.pricing-price {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: flex-start;
    justify-content: center;
    gap: 0.25rem;
}

.currency {
    font-size: 2rem;
    font-weight: 600;
}

.amount {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1;
}

.period {
    font-size: 1.25rem;
    color: var(--color-gray-600);
    align-self: flex-end;
    padding-bottom: 0.5rem;
}

.pricing-features {
    margin-bottom: var(--spacing-lg);
}

.pricing-features li {
    padding: var(--spacing-xs) 0;
    border-bottom: 1px solid var(--color-gray-200);
}

.pricing-card-featured .pricing-features li {
    border-bottom-color: rgba(255, 255, 255, 0.2);
}

.pricing-note {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: var(--color-gray-100);
    border-radius: var(--radius-lg);
}

.pricing-note strong {
    color: var(--color-primary);
}

/* ============================================
   TESTIMONIALS SECTION
   ============================================ */
.testimonials {
    padding: var(--spacing-3xl) 0;
    background-color: var(--color-gray-100);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.testimonial-card {
    padding: var(--spacing-lg);
    background-color: var(--color-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
    position: relative;
}

.testimonial-card:hover {
    transform: translateY(-10px) rotateX(3deg) rotateY(-2deg);
    box-shadow:
        0 25px 60px rgba(0, 0, 0, 0.15),
        0 0 0 1px rgba(163, 52, 230, 0.1);
}

.testimonial-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 0;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    border-radius: var(--radius-lg) 0 0 var(--radius-lg);
    transition: height 0.4s ease;
}

.testimonial-card:hover::before {
    height: 100%;
}

.testimonial-content {
    margin-bottom: var(--spacing-md);
}

.testimonial-text {
    font-size: 1.125rem;
    color: var(--color-gray-700);
    font-style: italic;
    line-height: 1.7;
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.author-avatar {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: var(--color-white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.125rem;
}

.author-name {
    font-size: 1rem;
    margin-bottom: 0.25rem;
}

.author-title {
    font-size: 0.875rem;
    color: var(--color-gray-600);
}

/* ============================================
   FOOTER
   ============================================ */
.footer {
    background-color: var(--color-black);
    color: var(--color-white);
    padding: var(--spacing-3xl) 0 var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 1.5rem;
    font-weight: 700;
}

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

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-lg);
}

.footer-column h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-md);
    font-size: 1.125rem;
}

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

.footer-column a {
    color: var(--color-gray-400);
    font-size: 0.9375rem;
}

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

.footer-bottom {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-gray-800);
    text-align: center;
}

.copyright {
    color: var(--color-gray-500);
    font-size: 0.875rem;
}

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

/* Tablets (768px and below) */
@media (max-width: 768px) {
    /* Navigation */
    .nav-links,
    .nav-cta {
        display: none;
    }

    .mobile-menu-toggle {
        display: flex;
    }

    /* Hero */
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-cta {
        justify-content: center;
    }

    .hero-visual {
        height: 400px;
    }

    .card-mockup {
        width: 280px;
        height: 360px;
    }

    /* Steps */
    .step {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .step-number {
        margin: 0 auto;
    }

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

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

    /* Comparison Table */
    .comparison-table {
        font-size: 0.875rem;
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
    }
}

/* Mobile (480px and below) */
@media (max-width: 480px) {
    /* Typography */
    html {
        font-size: 14px;
    }

    /* Spacing */
    .hero,
    .product-highlights,
    .how-it-works,
    .features-detailed,
    .comparison,
    .pricing,
    .testimonials {
        padding: var(--spacing-xl) 0;
    }

    /* Hero */
    .hero-cta {
        flex-direction: column;
    }

    .btn-lg {
        width: 100%;
    }

    /* Highlights */
    .highlights-grid {
        grid-template-columns: 1fr;
    }

    /* Features */
    .feature-item {
        flex-direction: column;
        text-align: center;
    }

    .feature-icon {
        margin: 0 auto;
    }

    /* Pricing */
    .pricing-cards {
        grid-template-columns: 1fr;
    }

    /* Testimonials */
    .testimonials-grid {
        grid-template-columns: 1fr;
    }

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

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-center {
    text-align: center;
}

.mb-0 {
    margin-bottom: 0;
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.hidden {
    display: none;
}