/**
 * KUARST - Main Stylesheet
 * Version: 1.0.0
 */

/* ============================================
   CSS Variables (Brand Colors)
   ============================================ */
:root {
    /* Primary Colors */
    --kuarst-primary: #0A4D8C;
    --kuarst-primary-dark: #073761;
    --kuarst-primary-light: #1565A8;
    
    /* Secondary Colors */
    --kuarst-secondary: #00C9A7;
    --kuarst-secondary-dark: #009B80;
    --kuarst-secondary-light: #33D4BA;
    
    /* Risk Colors */
    --kuarst-safe: #00D26A;
    --kuarst-safe-bg: #E6F9F0;
    --kuarst-moderate: #FFB020;
    --kuarst-moderate-bg: #FFF8E6;
    --kuarst-suspicious: #FF6B35;
    --kuarst-suspicious-bg: #FFF0EB;
    --kuarst-dangerous: #E63946;
    --kuarst-dangerous-bg: #FFEBEC;
    
    /* Neutrals */
    --kuarst-text-primary: #1A1A2E;
    --kuarst-text-secondary: #6B7280;
    --kuarst-text-tertiary: #9CA3AF;
    --kuarst-bg-primary: #FFFFFF;
    --kuarst-bg-secondary: #F8FAFC;
    --kuarst-bg-tertiary: #F1F5F9;
    --kuarst-border: #E5E7EB;
    
    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    
    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(10, 77, 140, 0.1);
    --shadow-md: 0 4px 12px rgba(10, 77, 140, 0.15);
    --shadow-lg: 0 8px 24px rgba(10, 77, 140, 0.2);
}

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

body {
    font-family: var(--font-primary);
    color: var(--kuarst-text-primary);
    background: var(--kuarst-bg-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

/* ============================================
   Container
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-6);
}

/* ============================================
   Header & Navigation
   ============================================ */
.header {
    background: var(--kuarst-bg-primary);
    border-bottom: 1px solid var(--kuarst-border);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(10px);
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-6) 0;
}

.nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    text-decoration: none;
    color: inherit;
    transition: opacity 0.2s;
}

.nav__logo:hover {
    opacity: 0.8;
}

.nav__logo svg {
    flex-shrink: 0;
}

.nav__brand {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--kuarst-primary);
}

.nav__links {
    display: flex;
    gap: var(--space-8);
    align-items: center;
}

.nav__link {
    font-weight: 500;
    color: var(--kuarst-text-secondary);
    transition: color 0.2s;
}

.nav__link:hover {
    color: var(--kuarst-primary);
}

.nav__link--primary {
    background: var(--kuarst-primary);
    color: white;
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    transition: all 0.2s;
}

.nav__link--primary:hover {
    background: var(--kuarst-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.nav__dropdown {
    position: relative;
}

.nav__dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: var(--kuarst-bg-primary);
    border: 1px solid var(--kuarst-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    min-width: 200px;
    margin-top: var(--space-2);
    z-index: 1000;
    overflow: hidden;
}

.nav__dropdown-menu.show {
    display: block;
}

.nav__dropdown-item {
    display: block;
    padding: var(--space-3) var(--space-4);
    color: var(--kuarst-text-primary);
    text-decoration: none;
    transition: background-color 0.2s;
    border-bottom: 1px solid var(--kuarst-border);
}

.nav__dropdown-item:last-child {
    border-bottom: none;
}

.nav__dropdown-item:hover {
    background: var(--kuarst-bg-secondary);
    color: var(--kuarst-primary);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    padding: var(--space-16) 0;
    background: linear-gradient(180deg, var(--kuarst-bg-primary) 0%, var(--kuarst-bg-secondary) 100%);
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-16);
    align-items: center;
}

.hero__badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    background: var(--kuarst-bg-tertiary);
    color: var(--kuarst-primary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: var(--space-6);
}

.hero__title {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: var(--space-6);
}

.gradient-text {
    background: linear-gradient(135deg, var(--kuarst-primary) 0%, var(--kuarst-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero__description {
    font-size: 1.25rem;
    color: var(--kuarst-text-secondary);
    margin-bottom: var(--space-8);
    max-width: 600px;
}

.hero__actions {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-12);
}

.hero__stats {
    display: flex;
    gap: var(--space-12);
}

.stat {
    text-align: center;
}

.stat__value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--kuarst-primary);
}

.stat__label {
    font-size: 0.875rem;
    color: var(--kuarst-text-secondary);
}

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

.phone-mockup {
    width: 300px;
    height: 600px;
    background: #1A1A2E;
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-lg);
    position: relative;
}

.phone-mockup__screen {
    width: 100%;
    height: 100%;
    background: white;
    border-radius: 32px;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
}

.scan-animation {
    position: relative;
    width: 200px;
    height: 200px;
}

.qr-code {
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(var(--kuarst-primary) 0%, var(--kuarst-primary) 100%) 0% 0% / 25% 25%,
        linear-gradient(var(--kuarst-primary) 0%, var(--kuarst-primary) 100%) 75% 0% / 25% 25%,
        linear-gradient(var(--kuarst-primary) 0%, var(--kuarst-primary) 100%) 0% 75% / 25% 25%,
        linear-gradient(var(--kuarst-secondary) 0%, var(--kuarst-secondary) 100%) 40% 40% / 20% 20%;
    background-repeat: no-repeat;
}

.scan-line {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--kuarst-secondary);
    box-shadow: 0 0 10px var(--kuarst-secondary);
    animation: scan 2s ease-in-out infinite;
}

@keyframes scan {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(198px); }
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-3) var(--space-6);
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1rem;
    border: none;
    cursor: pointer;
    transition: all 0.2s;
}

.btn--primary {
    background: var(--kuarst-primary);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn--primary:hover {
    background: var(--kuarst-primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn--secondary {
    background: transparent;
    color: var(--kuarst-primary);
    border: 2px solid var(--kuarst-primary);
}

.btn--secondary:hover {
    background: var(--kuarst-bg-tertiary);
}

.btn--large {
    padding: var(--space-4) var(--space-8);
    font-size: 1.125rem;
}

/* ============================================
   Features Section
   ============================================ */
.features {
    padding: var(--space-16) 0;
    background: var(--kuarst-bg-primary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--space-12);
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.section-description {
    font-size: 1.25rem;
    color: var(--kuarst-text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--space-8);
}

.feature-card {
    background: var(--kuarst-bg-primary);
    border: 1px solid var(--kuarst-border);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-card__icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-5);
}

.feature-card__title {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.feature-card__description {
    color: var(--kuarst-text-secondary);
    line-height: 1.7;
}

/* ============================================
   How It Works Section
   ============================================ */
.how-it-works {
    padding: var(--space-16) 0;
    background: var(--kuarst-bg-secondary);
}

.steps {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-8);
    max-width: 1000px;
    margin: 0 auto;
}

.step {
    flex: 1;
    background: var(--kuarst-bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-8);
    text-align: center;
}

.step__number {
    width: 48px;
    height: 48px;
    background: var(--kuarst-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto var(--space-5);
}

.step__content {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.step__title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--space-3);
}

.step__description {
    color: var(--kuarst-text-secondary);
}

.step-arrow {
    font-size: 2rem;
    color: var(--kuarst-primary);
    font-weight: 700;
}

/* ============================================
   Download Section
   ============================================ */
.download {
    padding: var(--space-16) 0;
    background: linear-gradient(135deg, var(--kuarst-primary) 0%, var(--kuarst-primary-dark) 100%);
    color: white;
}

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

.download__title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--space-4);
}

.download__description {
    font-size: 1.25rem;
    opacity: 0.9;
    margin-bottom: var(--space-8);
}

.download__form {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-6);
}

.download__input {
    flex: 1;
    padding: var(--space-4);
    border-radius: var(--radius-md);
    border: none;
    font-size: 1rem;
}

.download__badges {
    display: flex;
    justify-content: center;
    gap: var(--space-4);
}

.badge {
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    font-weight: 600;
}

.badge--soon {
    background: rgba(255, 255, 255, 0.2);
    color: white;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    background: var(--kuarst-bg-tertiary);
    padding: var(--space-12) 0 var(--space-6);
}

.footer__content {
    display: grid;
    grid-template-columns: 2fr 3fr;
    gap: var(--space-12);
    margin-bottom: var(--space-8);
}

.footer__brand {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.footer__brand span {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--kuarst-primary);
}

.footer__tagline {
    color: var(--kuarst-text-secondary);
    font-size: 0.875rem;
}

.footer__links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-8);
}

.footer__column h4 {
    font-weight: 600;
    margin-bottom: var(--space-4);
}

.footer__column a {
    display: block;
    color: var(--kuarst-text-secondary);
    margin-bottom: var(--space-2);
    transition: color 0.2s;
}

.footer__column a:hover {
    color: var(--kuarst-primary);
}

.footer__bottom {
    text-align: center;
    padding-top: var(--space-6);
    border-top: 1px solid var(--kuarst-border);
    color: var(--kuarst-text-secondary);
    font-size: 0.875rem;
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero__content {
        max-width: 600px;
        margin: 0 auto;
    }
    
    .hero__description {
        margin: 0 auto var(--space-8);
    }
    
    .hero__actions {
        justify-content: center;
    }
    
    .hero__stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    .nav__links {
        display: none;
    }
    
    .hero__title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .download__form {
        flex-direction: column;
    }
    
    .footer__content {
        grid-template-columns: 1fr;
    }
}