/* ========================================
   CSS Variables & Root Styles
   ======================================== */
:root {
    /* Primary Colors - Light Purple Theme */
    --primary: #9B59B6;
    --primary-dark: #8E44AD;
    --primary-light: #E8DAEF;
    --secondary: #D4A5E8;
    
    /* Accent Colors */
    --accent: #9B59B6;
    --accent-hover: #8E44AD;
    
    /* Background Colors */
    --bg-primary: #FAFAFA;
    --bg-secondary: #FFFFFF;
    --bg-gradient: linear-gradient(135deg, #E8DAEF 0%, #F5EEF8 50%, #F8F0FC 100%);
    
    /* Text Colors */
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-white: #FFFFFF;
    
    /* Status Colors */
    --success: #27AE60;
    --warning: #F39C12;
    --danger: #E74C3C;
    --info: #3498DB;
    
    /* Card Colors */
    --card-bg: #FFFFFF;
    --card-shadow: 0 10px 40px rgba(155, 89, 182, 0.1);
    --card-shadow-hover: 0 20px 60px rgba(155, 89, 182, 0.2);
    
    /* Spacing */
    --section-padding: 100px 0;
    --container-padding: 0 20px;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-xl: 30px;
    
    /* Transitions */
    --transition: all 0.3s ease;
    
    /* Font Family */
    --font-primary: 'Poppins', sans-serif;
}

/* ========================================
   Reset & Base Styles
   ======================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-primary);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--container-padding);
}

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

ul {
    list-style: none;
}

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

h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.2;
}

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

/* ========================================
   Header/Navigation
   ======================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: transparent;
    transition: var(--transition);
}

.header.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.navbar {
    padding: 20px 0;
    transition: var(--transition);
}

.header.scrolled .navbar {
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary);
}

.logo i {
    font-size: 28px;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 40px;
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-primary);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition);
}

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

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

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

.menu-toggle .bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    transition: var(--transition);
    border-radius: 3px;
}

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

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

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

/* ========================================
   Hero Section
   ======================================== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 120px 0 80px;
    background: var(--bg-gradient);
    position: relative;
    overflow: hidden;
}

.hero-decoration {
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(155, 89, 182, 0.1) 0%, transparent 70%);
    border-radius: 50%;
    z-index: 0;
}

.hero .container {
    position: relative;
    z-index: 1;
}

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

.hero-text {
    max-width: 600px;
}

.app-name {
    color: var(--primary);
}

.hero-title {
    font-size: 56px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.hero-tagline {
    font-size: 28px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 20px;
}

.hero-description {
    font-size: 18px;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-weight: 600;
    transition: var(--transition);
}

.btn i {
    font-size: 28px;
}

.btn span {
    display: flex;
    flex-direction: column;
    line-height: 1.3;
}

.btn small {
    font-size: 12px;
    font-weight: 400;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(155, 89, 182, 0.3);
}

.btn-secondary {
    background: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--primary-light);
}

.btn-secondary:hover {
    background: var(--primary-light);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(155, 89, 182, 0.2);
}

/* Phone Mockup */
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.phone-mockup {
    width: 320px;
    height: 650px;
    background: linear-gradient(145deg, #2C3E50, #34495E);
    border-radius: 45px;
    padding: 12px;
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.3);
    position: relative;
}

.phone-mockup::before {
    content: '';
    position: absolute;
    top: 20px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 25px;
    background: #1a1a1a;
    border-radius: 20px;
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: var(--bg-gradient);
    border-radius: 35px;
    overflow: hidden;
    padding: 60px 20px 20px;
}

.app-preview {
    background: rgba(255, 255, 255, 0.95);
    border-radius: var(--radius-md);
    padding: 20px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.1);
}

.preview-header {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--primary-light);
    margin-bottom: 15px;
}

.preview-header i {
    color: var(--primary);
    font-size: 20px;
}

.preview-header span {
    font-weight: 600;
    color: var(--text-primary);
}

.preview-stats {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    margin-bottom: 15px;
}

.stat-item {
    background: var(--primary-light);
    border-radius: var(--radius-sm);
    padding: 15px;
    text-align: center;
}

.stat-item i {
    color: var(--primary);
    font-size: 24px;
    margin-bottom: 8px;
}

.stat-item span {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    font-size: 18px;
}

.stat-item small {
    color: var(--text-secondary);
    font-size: 12px;
}

.preview-alerts {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.alert-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-radius: var(--radius-sm);
    background: var(--bg-secondary);
}

.alert-item i {
    font-size: 18px;
}

.alert-item span {
    font-weight: 500;
    color: var(--text-primary);
}

.alert-item.duplicate {
    border-left: 4px solid var(--danger);
}

.alert-item.duplicate i {
    color: var(--danger);
}

.alert-item.blur {
    border-left: 4px solid var(--warning);
}

.alert-item.blur i {
    color: var(--warning);
}

.alert-item.similar {
    border-left: 4px solid var(--info);
}

.alert-item.similar i {
    color: var(--info);
}

/* ========================================
   Section Common Styles
   ======================================== */
.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto 60px;
}

.section-title {
    font-size: 42px;
    color: var(--text-primary);
    margin-bottom: 20px;
}

.section-subtitle {
    font-size: 18px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   Features Section
   ======================================== */
.features {
    padding: var(--section-padding);
    background: var(--bg-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: var(--card-bg);
    padding: 40px 30px;
    border-radius: var(--radius-lg);
    text-align: center;
    box-shadow: var(--card-shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: var(--primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--card-shadow-hover);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    transition: var(--transition);
}

.feature-card:hover .feature-icon {
    background: var(--primary);
}

.feature-icon i {
    font-size: 32px;
    color: var(--primary);
    transition: var(--transition);
}

.feature-card:hover .feature-icon i {
    color: var(--text-white);
}

.feature-title {
    font-size: 20px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.feature-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ========================================
   How It Works Section
   ======================================== */
.how-it-works {
    padding: var(--section-padding);
    background: var(--bg-gradient);
}

.steps-container {
    display: flex;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
    position: relative;
}

.step-number {
    position: absolute;
    top: -10px;
    right: 20px;
    width: 35px;
    height: 35px;
    background: var(--primary);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 16px;
    z-index: 2;
}

.step-icon {
    width: 120px;
    height: 120px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    box-shadow: var(--card-shadow);
    position: relative;
    z-index: 1;
}

.step-icon i {
    font-size: 45px;
    color: var(--primary);
}

.step-title {
    font-size: 24px;
    color: var(--text-primary);
    margin-bottom: 15px;
}

.step-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
    max-width: 280px;
    margin: 0 auto;
}

.step-arrow {
    display: flex;
    align-items: center;
    padding-top: 45px;
}

.step-arrow i {
    font-size: 24px;
    color: var(--primary-light);
}

/* ========================================
   Download Section
   ======================================== */
.download {
    padding: var(--section-padding);
    background: var(--primary);
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -20%;
    width: 600px;
    height: 600px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
}

.download::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: rgba(0, 0, 0, 0.1);
    border-radius: 50%;
}

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

.download-title {
    font-size: 48px;
    color: var(--text-white);
    margin-bottom: 20px;
}

.download-subtitle {
    font-size: 20px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 25px;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    gap: 15px;
    background: var(--text-white);
    color: var(--text-primary);
    padding: 18px 35px;
    border-radius: var(--radius-md);
    transition: var(--transition);
    min-width: 220px;
}

.download-btn:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.2);
}

.download-btn i {
    font-size: 36px;
    color: var(--text-primary);
}

.btn-text {
    text-align: left;
}

.btn-text .btn-small {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
}

.btn-text .btn-large {
    display: block;
    font-size: 18px;
    font-weight: 700;
    color: var(--text-primary);
}

/* ========================================
   Footer
   ======================================== */
.footer {
    padding: 60px 0 30px;
    background: #2C3E50;
    color: var(--text-white);
}

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

.footer-logo .logo {
    color: var(--text-white);
    margin-bottom: 15px;
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.7);
}

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

.footer-column h4 {
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-white);
}

.footer-column a {
    display: block;
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 12px;
    font-size: 15px;
}

.footer-column a:hover {
    color: var(--primary-light);
    padding-left: 5px;
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    font-size: 14px;
}

.social-links {
    display: flex;
    gap: 20px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--primary);
}

/* ========================================
   Scroll to Top Button
   ======================================== */
.scroll-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: 0 5px 20px rgba(155, 89, 182, 0.3);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.scroll-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-3px);
}

/* ========================================
   Responsive Styles
   ======================================== */

/* Tablet */
@media (max-width: 1024px) {
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-text {
        max-width: 100%;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .hero-image {
        order: -1;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .steps-container {
        flex-direction: column;
        align-items: center;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        padding: 20px 0;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-links {
        justify-content: center;
    }
}

/* Mobile */
@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 300px;
        height: 100vh;
        background: var(--bg-secondary);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        gap: 30px;
        transition: var(--transition);
        box-shadow: -5px 0 30px rgba(0, 0, 0, 0.1);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .hero {
        padding: 100px 0 60px;
        min-height: auto;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-tagline {
        font-size: 22px;
    }
    
    .hero-description {
        font-size: 16px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }
    
    .phone-mockup {
        width: 260px;
        height: 520px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card {
        padding: 30px 20px;
    }
    
    .download-title {
        font-size: 32px;
    }
    
    .download-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .download-btn {
        width: 100%;
        max-width: 280px;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}

/* Small Mobile */
@media (max-width: 480px) {
    .hero-title {
        font-size: 28px;
    }
    
    .section-title {
        font-size: 26px;
    }
    
    .step-icon {
        width: 100px;
        height: 100px;
    }
    
    .step-icon i {
        font-size: 36px;
    }
}

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

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

.hero-image {
    animation: fadeInUp 0.8s ease 0.3s forwards;
    opacity: 0;
}

.feature-card {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.feature-card:nth-child(1) { animation-delay: 0.1s; }
.feature-card:nth-child(2) { animation-delay: 0.2s; }
.feature-card:nth-child(3) { animation-delay: 0.3s; }
.feature-card:nth-child(4) { animation-delay: 0.4s; }

.step {
    opacity: 0;
    animation: fadeInUp 0.6s ease forwards;
}

.step:nth-child(1) { animation-delay: 0.1s; }
.step:nth-child(3) { animation-delay: 0.3s; }
.step:nth-child(5) { animation-delay: 0.5s; }