/*
 * Aurora Forecast Landing Page
 * Design System & Styles
 */

/* ============================================
   CSS Variables & Theme
   ============================================ */

:root {
    --bg-primary: #0A0E1A;
    --bg-secondary: #0F1420;
    --bg-tertiary: #151C2A;
    
    --accent-teal: #00E5A0;
    --accent-teal-dark: #00D4AA;
    --accent-gold: #D4A055;
    
    --text-primary: #FFFFFF;
    --text-secondary: #B0B8C4;
    --text-tertiary: #7A8290;
    
    --border-color: #1F2838;
    
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-lg: 18px;
    --font-size-xl: 24px;
    --font-size-2xl: 32px;
    --font-size-3xl: 48px;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease-out;
}

/* ============================================
   Reset & Base Styles
   ============================================ */

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

html {
    scroll-behavior: smooth;
}

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

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

h1, h2, h3, h4, h5, h6 {
    color: var(--text-primary);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-2xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-xl);
}

p {
    margin-bottom: 1rem;
}

a {
    color: var(--accent-teal);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--accent-teal-dark);
}

button {
    font-family: var(--font-family);
    cursor: pointer;
}

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

.header {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: rgba(10, 14, 26, 0.8);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
}

.navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-primary);
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    background: linear-gradient(135deg, #00E5A0, #D4A055);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 2rem;
    list-style: none;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    transition: var(--transition-fast);
}

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

.nav-cta {
    background: var(--accent-gold);
    color: var(--bg-primary) !important;
    padding: 0.5rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    transition: var(--transition-fast);
}

.nav-cta:hover {
    background: #E5B870;
    color: var(--bg-primary) !important;
}

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

.hero {
    padding: 6rem 2rem;
    background: linear-gradient(180deg, #0A0E1A 0%, #0F1420 50%, #0A0E1A 100%);
    position: relative;
    overflow: hidden;
}

/* Subtle aurora gradient background effect */
.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(0, 229, 160, 0.1) 0%, rgba(212, 160, 85, 0.05) 50%, transparent 70%);
    border-radius: 50%;
    filter: blur(60px);
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(-30px, 20px); }
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 6rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    display: flex;
    flex-direction: column;
}

.hero-headline {
    font-size: 3.5rem;
    font-weight: 700;
    line-height: 1.1;
    margin-bottom: 1.5rem;
    background: linear-gradient(135deg, #FFFFFF, #B0B8C4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subheadline {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: 2rem;
    line-height: 1.8;
}

.signup-form {
    display: flex;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.email-input {
    flex: 1;
    min-width: 250px;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    transition: var(--transition-fast);
}

.email-input::placeholder {
    color: var(--text-tertiary);
}

.email-input:focus {
    outline: none;
    border-color: var(--accent-teal);
    background: rgba(0, 229, 160, 0.05);
}

.cta-button {
    padding: 1rem 2rem;
    background: var(--accent-gold);
    color: var(--bg-primary);
    border: none;
    border-radius: 8px;
    font-weight: 700;
    font-size: var(--font-size-base);
    white-space: nowrap;
    transition: var(--transition-fast);
}

.cta-button:hover {
    background: #E5B870;
    transform: translateY(-2px);
}

.cta-button:active {
    transform: translateY(0);
}

.form-note {
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
}

.form-message {
    padding: 1rem 1.5rem;
    border-radius: 8px;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-top: 1rem;
    animation: slideDown 0.3s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.form-message-success {
    background: rgba(0, 229, 160, 0.15);
    border: 1px solid var(--accent-teal);
    color: var(--accent-teal);
}

.form-message-error {
    background: rgba(220, 53, 69, 0.15);
    border: 1px solid #DC3545;
    color: #FF6B7A;
}

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

.app-mockup {
    width: 100%;
    max-width: 350px;
    background: linear-gradient(135deg, rgba(0, 229, 160, 0.1), rgba(212, 160, 85, 0.05));
    border: 1px solid var(--border-color);
    border-radius: 20px;
    padding: 1.5rem;
    box-shadow: 0 20px 60px rgba(0, 229, 160, 0.1);
    animation: slideUp 0.8s ease-out;
}

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

.mockup-header {
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1.5rem;
    font-size: var(--font-size-lg);
    text-align: center;
}

.mockup-content {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mockup-stat {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    background: rgba(0, 229, 160, 0.1);
    border-radius: 8px;
    border: 1px solid rgba(0, 229, 160, 0.2);
}

.stat-label {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    font-weight: 600;
}

.stat-value {
    color: var(--accent-teal);
    font-size: var(--font-size-xl);
    font-weight: 700;
}

.mockup-bar {
    height: 4px;
    background: linear-gradient(90deg, var(--accent-teal), var(--accent-gold));
    border-radius: 2px;
    margin: 0.5rem 0;
}

.mockup-text {
    text-align: center;
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin: 0;
}

/* ============================================
   Section Containers & Common Styles
   ============================================ */

.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

main > section {
    padding: 5rem 2rem;
}

main > section:nth-child(even) {
    background: var(--bg-secondary);
}

h2 {
    text-align: center;
    margin-bottom: 1rem;
}

.section-intro,
.cta-intro,
.steps-subtitle {
    text-align: center;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

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

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    padding: 2rem;
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    transition: var(--transition);
    cursor: pointer;
}

.feature-card:hover {
    border-color: var(--accent-teal);
    background: rgba(0, 229, 160, 0.05);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    display: block;
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

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

.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 2rem;
}

.step {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    text-align: center;
    flex: 1;
    min-width: 180px;
}

.step-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--accent-gold);
    color: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.step-content h3 {
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.step-content p {
    color: var(--text-tertiary);
    margin: 0;
}

.step-arrow {
    font-size: 1.5rem;
    color: var(--accent-teal);
    display: none;
}

@media (min-width: 768px) {
    .step-arrow {
        display: block;
    }
}

.steps-subtitle {
    color: var(--accent-teal);
    font-weight: 600;
    margin-bottom: 0;
}

/* ============================================
   About Section
   ============================================ */

.about {
    background: linear-gradient(135deg, rgba(0, 229, 160, 0.05), rgba(212, 160, 85, 0.05));
}

.about-text {
    max-width: 750px;
    margin: 0 auto 1.5rem;
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    line-height: 1.8;
}

.about-text:last-of-type {
    margin-bottom: 0;
}

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

.cta-section {
    background: linear-gradient(135deg, var(--bg-secondary), rgba(0, 229, 160, 0.05));
    border-top: 1px solid var(--border-color);
    border-bottom: 1px solid var(--border-color);
}

.signup-form-secondary {
    justify-content: center;
    max-width: 600px;
    margin: 0 auto 2rem;
}

.signup-form-secondary .email-input {
    flex: 1 1 100%;
    min-width: 100%;
}

.form-privacy {
    text-align: center;
    font-size: var(--font-size-sm);
    color: var(--text-tertiary);
    margin: 0;
}

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

.footer {
    background: var(--bg-secondary);
    border-top: 1px solid var(--border-color);
    padding: 4rem 0 2rem;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 4rem;
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid var(--border-color);
}

.footer-brand {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.footer-logo {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--text-primary);
}

.footer-tagline {
    color: var(--text-tertiary);
    margin: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 3rem;
}

.footer-column h4 {
    color: var(--text-primary);
    margin-bottom: 1rem;
    font-size: var(--font-size-base);
}

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

.footer-column li {
    margin-bottom: 0.75rem;
}

.footer-column a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.footer-bottom {
    text-align: center;
    padding-top: 1rem;
}

.copyright {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    margin: 0 0 0.5rem;
}

.footer-domain {
    color: var(--text-tertiary);
    font-size: var(--font-size-sm);
    margin: 0;
}

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

@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }
    
    h2 {
        font-size: var(--font-size-xl);
    }
    
    .navbar-container {
        padding: 0 1rem;
    }
    
    .nav-links {
        gap: 1rem;
    }
    
    .nav-links a {
        font-size: var(--font-size-sm);
    }
    
    .hero {
        padding: 3rem 0;
    }
    
    .hero-container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-headline {
        font-size: 2rem;
    }
    
    .signup-form {
        flex-direction: column;
    }
    
    .email-input,
    .cta-button {
        width: 100%;
    }
    
    main > section {
        padding: 3rem 1.5rem;
    }
    
    .section-intro,
    .cta-intro,
    .steps-subtitle {
        margin-bottom: 2rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }
    
    .steps-container {
        gap: 1rem;
        flex-direction: column;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
        gap: 1.5rem;
    }
}

@media (max-width: 480px) {
    :root {
        --font-size-3xl: 32px;
        --font-size-2xl: 24px;
    }
    
    .logo-text {
        display: none;
    }
    
    .nav-links {
        gap: 0.5rem;
    }
    
    .hero {
        padding: 2rem 0;
    }
    
    .hero-headline {
        font-size: 1.75rem;
    }
    
    .hero-visual {
        margin-bottom: 1rem;
    }
    
    main > section {
        padding: 2rem 1rem;
    }
    
    .step-arrow {
        transform: rotate(90deg);
        margin: -1rem 0;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
}

/* ============================================
   Performance & Animations
   ============================================ */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Optimize for print */
@media print {
    .header,
    .footer {
        display: none;
    }
    
    a {
        color: inherit;
    }
}