/* ============================================
   GiftHub Landing Page Styles
   ============================================ */

:root {
    --primary: #4F7DFF;
    --primary-dark: #3D5FCC;
    --primary-light: #EEF3FF;
    --secondary: #FF6B6B;
    --success: #34C759;
    --warning: #FF9500;
    --text-primary: #1A1A2E;
    --text-secondary: #666680;
    --text-light: #9999A8;
    --bg-white: #FFFFFF;
    --bg-light: #F8F9FC;
    --bg-gradient: linear-gradient(135deg, #4F7DFF 0%, #6B8FFF 100%);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.12);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 32px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;
    color: var(--text-primary);
    background: var(--bg-white);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   Typography
   ============================================ */

h1, h2, h3, h4 {
    font-weight: 700;
    line-height: 1.2;
}

h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    letter-spacing: -0.01em;
}

h3 {
    font-size: 1.5rem;
}

p {
    color: var(--text-secondary);
}

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

/* ============================================
   Buttons
   ============================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: var(--bg-gradient);
    color: white !important;
    box-shadow: 0 4px 15px rgba(79, 125, 255, 0.3);
}

a.btn-primary,
a.btn-primary:visited,
a.btn-primary:hover,
a.btn-primary:active {
    color: white !important;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(79, 125, 255, 0.4);
}

.store-btn {
    display: inline-block;
    transition: transform 0.3s ease;
}

.store-btn img {
    height: 52px;
    width: auto;
}

.store-btn:hover {
    transform: translateY(-3px);
}

/* ============================================
   Navigation
   ============================================ */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--text-primary);
}

.logo-img {
    height: 40px;
    width: auto;
    border-radius: 10px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    transition: color 0.3s ease;
}

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

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
}

.mobile-menu-btn span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

/* ============================================
   Hero Section
   ============================================ */

.hero {
    position: relative;
    padding: 160px 0 100px;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-content {
    z-index: 2;
}

.hero-subtitle {
    font-size: 1.25rem;
    margin: 24px 0 32px;
    max-width: 500px;
}

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

.hero-note {
    margin-top: 24px;
    font-size: 0.9rem;
    color: var(--text-light);
}

.hero-image {
    display: flex;
    justify-content: center;
    z-index: 2;
}

.phone-mockup {
    position: relative;
}

.phone-mockup img {
    max-width: 320px;
    height: auto;
    border-radius: 40px;
    box-shadow: var(--shadow-lg);
}

.hero-bg {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 80%;
    height: 150%;
    background: var(--primary-light);
    border-radius: 50%;
    z-index: 1;
    opacity: 0.5;
}

/* ============================================
   Section Headers
   ============================================ */

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto 60px;
}

.section-header p {
    margin-top: 16px;
    font-size: 1.125rem;
}

/* ============================================
   Features Section
   ============================================ */

.features {
    padding: 100px 0;
    background: var(--bg-light);
}

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

.feature-card {
    background: var(--bg-white);
    padding: 32px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 16px;
}

.feature-card h3 {
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-card p {
    font-size: 0.95rem;
}

/* ============================================
   How It Works Section
   ============================================ */

.how-it-works {
    padding: 100px 0;
}

.steps {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin-top: 40px;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    max-width: 280px;
}

.step-number {
    width: 64px;
    height: 64px;
    background: var(--bg-gradient);
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    box-shadow: 0 4px 15px rgba(79, 125, 255, 0.3);
}

.step-content h3 {
    margin-bottom: 12px;
}

/* ============================================
   Screenshots Section
   ============================================ */

.screenshots {
    padding: 100px 0;
    background: var(--bg-light);
    overflow: hidden;
}

.screenshots-grid {
    display: flex;
    justify-content: center;
    gap: 24px;
    padding: 20px 0;
    flex-wrap: wrap;
}

.screenshot-item {
    flex-shrink: 0;
}

.screenshot-item img {
    height: 500px;
    width: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

/* ============================================
   Download CTA Section
   ============================================ */

.download-cta {
    padding: 100px 0;
    background: var(--bg-gradient);
    text-align: center;
}

.cta-content h2 {
    color: white;
    margin-bottom: 16px;
}

.cta-content p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.25rem;
    margin-bottom: 32px;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

/* ============================================
   Footer
   ============================================ */

.footer {
    padding: 60px 0 30px;
    background: var(--text-primary);
    color: white;
}

.footer-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}

.footer-brand p {
    color: rgba(255, 255, 255, 0.7);
    margin-top: 16px;
}

.footer-logo {
    height: 50px;
    width: auto;
    border-radius: 12px;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-column h4 {
    font-size: 1rem;
    margin-bottom: 20px;
    color: white;
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    margin-bottom: 12px;
    transition: color 0.3s ease;
}

.footer-column a:hover {
    color: white;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* ============================================
   Responsive Design
   ============================================ */

@media (max-width: 992px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .hero-content {
        order: 1;
    }

    .hero-image {
        order: 0;
        margin-bottom: 40px;
    }

    .hero-subtitle {
        margin-left: auto;
        margin-right: auto;
    }

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

    .hero-bg {
        top: -20%;
        right: -50%;
        width: 150%;
    }

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

    .steps {
        flex-direction: column;
        align-items: center;
        gap: 40px;
    }

    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .footer-links {
        justify-items: center;
    }
}

@media (max-width: 768px) {
    .nav-links {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: white;
        flex-direction: column;
        padding: 24px;
        gap: 20px;
        box-shadow: var(--shadow-md);
        transform: translateY(-150%);
        transition: transform 0.3s ease;
    }

    .nav-links.active {
        transform: translateY(0);
    }

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

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

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

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

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

    .phone-mockup img {
        max-width: 260px;
    }

    .screenshot-item img {
        height: 400px;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}

@media (max-width: 480px) {
    .hero {
        padding: 120px 0 60px;
    }

    .store-btn img {
        height: 44px;
    }

    .phone-mockup img {
        max-width: 220px;
    }
}

/* ============================================
   Animations
   ============================================ */

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

.hero-content,
.hero-image,
.feature-card,
.step {
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(2) { animation-delay: 0.1s; }
.feature-card:nth-child(3) { animation-delay: 0.2s; }
.feature-card:nth-child(4) { animation-delay: 0.3s; }
.feature-card:nth-child(5) { animation-delay: 0.4s; }
.feature-card:nth-child(6) { animation-delay: 0.5s; }

.step:nth-child(2) { animation-delay: 0.1s; }
.step:nth-child(3) { animation-delay: 0.2s; }