/* BetterNature Landing Page Styles */
/* Design System: Warm, retro minimalist - 1970s graphic design meets modern health accountability */

/* ================================
   CSS Variables - BetterNature Palette
   ================================ */
:root {
    /* Primary Colors */
    --burnt-orange: #C65D24;
    --burnt-orange-light: #E87A3F;
    --burnt-orange-dark: #8C4019;

    --forest-green: #0D2619;
    --forest-green-light: #1A4D33;

    /* Neutral Colors */
    --cream: #F5F1E8;
    --warm-white: #FFFEF9;

    /* Accent Colors */
    --peach: #E8C4A8;
    --coral: #D4785C;

    /* Semantic */
    --text-primary: var(--forest-green);
    --text-secondary: rgba(13, 38, 25, 0.6);
    --text-tertiary: rgba(13, 38, 25, 0.4);
    --background: var(--cream);
    --card-background: var(--warm-white);
    --border: rgba(13, 38, 25, 0.15);
    --divider: rgba(13, 38, 25, 0.1);

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;

    /* Spacing (4pt grid) */
    --spacing-xs: 4px;
    --spacing-s: 8px;
    --spacing-m: 12px;
    --spacing-l: 16px;
    --spacing-xl: 20px;
    --spacing-xxl: 24px;
    --spacing-3xl: 32px;
    --spacing-4xl: 40px;
    --spacing-5xl: 48px;
    --spacing-6xl: 64px;
    --spacing-7xl: 80px;

    /* Border Radius */
    --radius-xs: 8px;
    --radius-s: 12px;
    --radius-m: 16px;
    --radius-l: 20px;
    --radius-xl: 24px;

    /* Shadows */
    --shadow-card: 0 5px 10px rgba(0, 0, 0, 0.05);
    --shadow-elevated: 0 8px 15px rgba(0, 0, 0, 0.1);
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-family);
    font-size: 16px;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background);
    min-height: 100vh;
    position: relative;
}

/* Subtle grain texture overlay for retro feel */
.grain-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    opacity: 0.03;
    z-index: 1000;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%' height='100%' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* ================================
   Layout
   ================================ */
.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: var(--spacing-xxl);
    padding-top: var(--spacing-7xl);
    padding-bottom: var(--spacing-6xl);
}

/* ================================
   Logo & Navigation
   ================================ */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-m);
    margin-bottom: var(--spacing-4xl);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--burnt-orange);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

/* ================================
   Hero Section
   ================================ */
.hero {
    text-align: center;
    margin-bottom: var(--spacing-7xl);
}

.badge {
    display: inline-block;
    padding: var(--spacing-s) var(--spacing-l);
    background-color: var(--card-background);
    border: 1px solid var(--border);
    border-radius: 100px;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--burnt-orange);
    margin-bottom: var(--spacing-3xl);
}

.headline {
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 700;
    line-height: 1.1;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xxl);
    letter-spacing: -0.03em;
}

.subheadline {
    font-size: clamp(1.125rem, 2.5vw, 1.25rem);
    line-height: 1.7;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ================================
   Features Section
   ================================ */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-7xl);
}

.feature-card {
    background-color: var(--card-background);
    border-radius: var(--radius-l);
    padding: var(--spacing-xxl);
    box-shadow: var(--shadow-card);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

.feature-icon {
    width: 48px;
    height: 48px;
    background-color: var(--burnt-orange);
    background: linear-gradient(135deg, var(--coral), var(--burnt-orange));
    border-radius: var(--radius-s);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--spacing-l);
}

.feature-icon svg {
    width: 24px;
    height: 24px;
    color: white;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.feature-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-s);
}

.feature-card p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ================================
   How It Works Section
   ================================ */
.how-it-works {
    margin-bottom: var(--spacing-7xl);
}

.how-it-works h2 {
    font-size: clamp(1.75rem, 4vw, 2.25rem);
    font-weight: 700;
    color: var(--text-primary);
    text-align: center;
    margin-bottom: var(--spacing-5xl);
    letter-spacing: -0.02em;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-3xl);
}

.step {
    text-align: center;
    padding: var(--spacing-xl);
}

.step-number {
    display: inline-block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--burnt-orange);
    opacity: 0.3;
    margin-bottom: var(--spacing-l);
    font-variant-numeric: tabular-nums;
}

.step h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-s);
}

.step p {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ================================
   CTA / Signup Section
   ================================ */
.cta-section {
    background-color: var(--card-background);
    border-radius: var(--radius-xl);
    padding: var(--spacing-5xl) var(--spacing-xxl);
    text-align: center;
    box-shadow: var(--shadow-card);
    margin-bottom: var(--spacing-6xl);
}

.cta-section h2 {
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-s);
    letter-spacing: -0.02em;
}

.cta-section > p {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-3xl);
}

.signup-form {
    display: flex;
    gap: var(--spacing-m);
    max-width: 480px;
    margin: 0 auto;
    flex-wrap: wrap;
    justify-content: center;
}

.email-input {
    flex: 1;
    min-width: 240px;
    padding: var(--spacing-l) var(--spacing-xl);
    font-size: 1rem;
    font-family: var(--font-family);
    color: var(--text-primary);
    background-color: var(--background);
    border: 1px solid var(--border);
    border-radius: var(--radius-m);
    outline: none;
    transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

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

.email-input:focus {
    border-color: var(--burnt-orange);
    box-shadow: 0 0 0 3px rgba(198, 93, 36, 0.15);
}

.submit-btn {
    padding: var(--spacing-l) var(--spacing-xxl);
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font-family);
    color: white;
    background-color: var(--burnt-orange);
    border: none;
    border-radius: var(--radius-m);
    cursor: pointer;
    transition: background-color 0.2s ease, transform 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 160px;
}

.submit-btn:hover {
    background-color: var(--burnt-orange-light);
}

.submit-btn:active {
    transform: scale(0.98);
}

.submit-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.spinner {
    width: 20px;
    height: 20px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.form-note {
    margin-top: var(--spacing-l);
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-height: 1.4em;
}

.form-note.success {
    color: var(--forest-green-light);
}

.form-note.error {
    color: var(--coral);
}

/* ================================
   Footer
   ================================ */
.footer {
    text-align: center;
    padding-top: var(--spacing-3xl);
    border-top: 1px solid var(--divider);
}

.footer-tagline {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-m);
}

.copyright {
    font-size: 0.875rem;
    color: var(--text-tertiary);
}

.footer-links {
    margin-top: var(--spacing-l);
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--text-tertiary);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-links a:hover {
    color: var(--burnt-orange);
}

/* ================================
   Responsive Adjustments
   ================================ */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-xl);
        padding-top: var(--spacing-5xl);
    }

    .hero {
        margin-bottom: var(--spacing-5xl);
    }

    .logo {
        justify-content: center;
    }

    .features {
        gap: var(--spacing-l);
        margin-bottom: var(--spacing-5xl);
    }

    .how-it-works {
        margin-bottom: var(--spacing-5xl);
    }

    .cta-section {
        padding: var(--spacing-3xl) var(--spacing-xl);
    }

    .signup-form {
        flex-direction: column;
    }

    .email-input,
    .submit-btn {
        width: 100%;
    }
}

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

    .feature-card {
        padding: var(--spacing-xl);
    }

    .step-number {
        font-size: 2.5rem;
    }
}

/* ================================
   Dark Mode Support
   ================================ */
@media (prefers-color-scheme: dark) {
    :root {
        --forest-green: #7FCF9F;
        --text-primary: #F5F1E8;
        --text-secondary: rgba(245, 241, 232, 0.7);
        --text-tertiary: rgba(245, 241, 232, 0.4);
        --background: #151515;
        --card-background: #1A1A1A;
        --border: rgba(245, 241, 232, 0.15);
        --divider: rgba(245, 241, 232, 0.1);
        --burnt-orange: #E87A3F;
        --burnt-orange-light: #FF9A5C;
    }

    .grain-overlay {
        opacity: 0.02;
    }

    .feature-icon {
        background: linear-gradient(135deg, var(--coral), var(--burnt-orange));
    }
}

/* ================================
   Animations
   ================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero,
.feature-card,
.step,
.cta-section {
    animation: fadeInUp 0.6s ease-out backwards;
}

.hero { animation-delay: 0.1s; }
.feature-card:nth-child(1) { animation-delay: 0.2s; }
.feature-card:nth-child(2) { animation-delay: 0.3s; }
.feature-card:nth-child(3) { animation-delay: 0.4s; }
.feature-card:nth-child(4) { animation-delay: 0.5s; }
.step:nth-child(1) { animation-delay: 0.3s; }
.step:nth-child(2) { animation-delay: 0.4s; }
.step:nth-child(3) { animation-delay: 0.5s; }
.cta-section { animation-delay: 0.4s; }