/* ============================================
   SKINAI - SKINCARE AI ANALYSIS APP
   Nude Theme Palette
   ============================================ */

/* Color Palette */
:root {
    /* Nude & Warm Tones */
    --primary-nude: #E8D5C4;
    --secondary-nude: #D4B5A0;
    --tertiary-nude: #C9A885;
    --light-nude: #F5EFEB;
    --dark-nude: #8B7355;
    
    /* Accent Colors */
    --accent-rose: #D4A5A5;
    --accent-gold: #D4AF37;
    --accent-cream: #FFF8F0;
    
    /* Neutral */
    --text-dark: #3D3D3D;
    --text-light: #6B6B6B;
    --border-color: #E8D5C4;
    --bg-light: #FFFBF7;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
    background-color: var(--bg-light);
    line-height: 1.6;
}

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

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
    font-family: 'Playfair Display', serif;
    font-weight: 600;
    color: var(--text-dark);
}

p {
    color: var(--text-light);
    font-size: 1rem;
}

/* ============================================
   NAVIGATION
   ============================================ */

.navbar {
    background-color: var(--light-nude);
    padding: var(--spacing-md) var(--spacing-xl);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

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

.navbar-brand {
    display: flex;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--secondary-nude), var(--accent-rose));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 500;
    font-size: 0.95rem;
    transition: all 0.3s ease;
    position: relative;
}

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

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

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

.nav-link.btn-primary {
    background-color: var(--secondary-nude);
    color: white;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 25px;
    transition: all 0.3s ease;
}

.nav-link.btn-primary:hover {
    background-color: var(--accent-rose);
    color: white;
}

.nav-link.btn-primary::after {
    display: none;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: 25px;
    font-family: 'Poppins', sans-serif;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
}

.btn-primary-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.btn-primary,
.btn-primary-large {
    background: linear-gradient(135deg, var(--secondary-nude), var(--accent-rose));
    color: white;
    box-shadow: 0 4px 15px rgba(212, 165, 165, 0.3);
}

.btn-primary:hover,
.btn-primary-large:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(212, 165, 165, 0.4);
}

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

.btn-secondary:hover {
    background-color: var(--light-nude);
    border-color: var(--accent-rose);
    color: var(--accent-rose);
}

/* ============================================
    HERO SECTION
    ============================================ */

.hero {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(135deg, var(--light-nude) 0%, var(--accent-cream) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
}

.hero-title {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--text-dark);
}

.hero-subtitle {
    font-size: 1.2rem;
    color: var(--text-light);
    margin-bottom: var(--spacing-lg);
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-img {
    width: 100%;
    max-width: 500px;
    border-radius: 20px;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.1);
    object-fit: cover;
}

/* ============================================
    FEATURES SECTION
    ============================================ */

.features {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background-color: var(--bg-light);
}

.section-title {
    font-size: 2.8rem;
    text-align: center;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.section-subtitle {
    font-size: 1.1rem;
    text-align: center;
    color: var(--text-light);
    margin-bottom: var(--spacing-2xl);
}

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

.feature-card {
    background-color: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
    transition: all 0.3s ease;
    border-top: 4px solid var(--secondary-nude);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 8px 25px rgba(212, 165, 165, 0.2);
}

.feature-image {
    width: 100%;
    height: 200px;
    overflow: hidden;
}

.feature-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.feature-card:hover .feature-image img {
    transform: scale(1.05);
}

.feature-title {
    font-size: 1.4rem;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-sm);
    color: var(--text-dark);
}

.feature-text {
    padding: 0 var(--spacing-md) var(--spacing-md);
    color: var(--text-light);
    font-size: 0.95rem;
}

/* ============================================
    HOW IT WORKS SECTION
    ============================================ */

.how-it-works {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(135deg, var(--light-nude) 0%, var(--accent-cream) 100%);
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    align-items: center;
    margin-top: var(--spacing-2xl);
}

.step {
    text-align: center;
    padding: var(--spacing-lg);
    background-color: white;
    border-radius: 15px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, var(--secondary-nude), var(--accent-rose));
    color: white;
    font-size: 1.8rem;
    font-weight: 700;
    border-radius: 50%;
    margin: 0 auto var(--spacing-md);
}

.step-title {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-dark);
}

.step-text {
    color: var(--text-light);
    font-size: 0.95rem;
}

.step-arrow {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: var(--secondary-nude);
    font-weight: 700;
}

@media (max-width: 768px) {
    .step-arrow {
        display: none;
    }
}

/* ============================================
    CTA SECTION
    ============================================ */

.cta {
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: linear-gradient(135deg, var(--secondary-nude), var(--accent-rose));
    text-align: center;
    color: white;
}

.cta-title {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    color: white;
}

.cta-subtitle {
    font-size: 1.1rem;
    margin-bottom: var(--spacing-lg);
    color: rgba(255, 255, 255, 0.9);
}

/* ============================================
    FOOTER
    ============================================ */

.footer {
    background-color: var(--dark-nude);
    color: white;
    padding: var(--spacing-2xl) var(--spacing-xl) var(--spacing-lg);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.footer-section h4 {
    color: var(--primary-nude);
    margin-bottom: var(--spacing-md);
    font-size: 1.1rem;
}

.footer-section p {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.95rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

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

@media (max-width: 768px) {
    .hero-content {
        grid-template-columns: 1fr;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-img {
        max-width: 100%;
    }

    .nav-links {
        gap: var(--spacing-md);
        font-size: 0.9rem;
    }

    .section-title {
        font-size: 2rem;
    }

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

    .cta-title {
        font-size: 1.8rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }

    .logo {
        font-size: 1.4rem;
    }

    .nav-links {
        gap: var(--spacing-sm);
    }

    .section-title {
        font-size: 1.6rem;
    }

    .btn-primary-large {
        padding: var(--spacing-sm) var(--spacing-md);
        font-size: 1rem;
    }
}