/* ========================================
   PROMPTVAULT - MINIMAL DESIGN
   ======================================== */

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

:root {
    --primary: #6366F1;
    --primary-dark: #4F46E5;
    --primary-light: #818CF8;

    --bg: #FFFFFF;
    --bg-alt: #F8FAFC;
    --text: #0F172A;
    --text-secondary: #475569;
    --text-muted: #94A3B8;
    --border: #E2E8F0;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --radius: 8px;
    --radius-lg: 12px;

    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.05);
}

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

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

/* ========================================
   LAYOUT
   ======================================== */

.container {
    max-width: 720px;
    margin: 0 auto;
    padding: 0 24px;
}

section {
    padding: 80px 0;
}

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

h1, h2, h3 {
    font-weight: 700;
    line-height: 1.2;
    color: var(--text);
}

.section-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: 8px;
}

.section-subtitle {
    text-align: center;
    color: var(--text-secondary);
    margin-bottom: 48px;
}

.gradient-text {
    background: linear-gradient(135deg, var(--primary) 0%, #A855F7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 600;
    font-family: var(--font);
    text-decoration: none;
    border-radius: var(--radius);
    border: 2px solid transparent;
    cursor: pointer;
    transition: all 0.2s ease;
}

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

.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border-color: var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
}

.btn-block {
    width: 100%;
}

/* ========================================
   HEADER
   ======================================== */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
}

.header-container {
    max-width: 720px;
    margin: 0 auto;
    padding: 12px 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text);
}

.logo-icon {
    width: 32px;
    height: 32px;
}

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

.hero {
    padding: 140px 0 80px;
    text-align: center;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.5rem);
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.1;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 480px;
    margin: 0 auto 32px;
}

.hero-cta {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

/* ========================================
   EXAMPLES
   ======================================== */

.examples {
    background: var(--bg-alt);
}

.examples-grid {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.example-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.example-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border);
}

.example-category {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.example-comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.example-basic,
.example-pro {
    padding: 24px;
}

.example-basic {
    background: var(--bg-alt);
    border-right: 1px solid var(--border);
}

.example-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    margin-bottom: 12px;
}

.example-basic .example-text {
    font-size: 1rem;
    color: var(--text-secondary);
    font-style: italic;
}

.example-pro .example-text {
    font-size: 0.8125rem;
    color: var(--text);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
    white-space: pre-wrap;
    line-height: 1.5;
    background: var(--bg-alt);
    padding: 16px;
    border-radius: var(--radius);
    max-height: 200px;
    overflow-y: auto;
}

/* ========================================
   PRICING
   ======================================== */

.pricing {
    padding: 80px 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-bottom: 24px;
}

.pricing-card {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 32px;
    text-align: center;
}

.pricing-card-pro {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary);
}

.pricing-tier {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-muted);
    margin-bottom: 8px;
}

.pricing-price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 4px;
}

.pricing-period {
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 24px;
}

.pricing-features {
    list-style: none;
    margin-bottom: 24px;
    text-align: left;
}

.pricing-features li {
    padding: 8px 0;
    padding-left: 24px;
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.pricing-features li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 16px;
    height: 16px;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20' fill='%2310B981'%3E%3Cpath fill-rule='evenodd' d='M16.707 5.293a1 1 0 010 1.414l-8 8a1 1 0 01-1.414 0l-4-4a1 1 0 011.414-1.414L8 12.586l7.293-7.293a1 1 0 011.414 0z' clip-rule='evenodd'/%3E%3C/svg%3E") no-repeat center;
}

.pricing-guarantee {
    text-align: center;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ========================================
   FAQ
   ======================================== */

.faq {
    background: var(--bg-alt);
}

.faq-list {
    max-width: 600px;
    margin: 0 auto;
}

.faq-item {
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px 24px;
    background: none;
    border: none;
    font-family: var(--font);
    font-size: 1rem;
    font-weight: 600;
    color: var(--text);
    text-align: left;
    cursor: pointer;
}

.faq-question:hover {
    color: var(--primary);
}

.faq-icon {
    flex-shrink: 0;
    color: var(--text-muted);
    transition: transform 0.2s ease;
}

.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

.faq-answer p {
    padding: 0 24px 20px;
    color: var(--text-secondary);
    line-height: 1.7;
}

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

.footer {
    background: var(--text);
    color: white;
    padding: 24px 0;
}

.footer-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 24px;
    flex-wrap: wrap;
    font-size: 0.875rem;
}

.footer-brand {
    font-weight: 700;
}

.footer-copyright {
    color: rgba(255,255,255,0.5);
}

.footer-content a {
    color: rgba(255,255,255,0.7);
    text-decoration: none;
    transition: color 0.2s ease;
}

.footer-content a:hover {
    color: white;
}

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

@media (max-width: 640px) {
    .container {
        padding: 0 20px;
    }

    section {
        padding: 60px 0;
    }

    .hero {
        padding: 120px 0 60px;
    }

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

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

    .hero-cta .btn {
        width: 100%;
    }

    .example-comparison {
        grid-template-columns: 1fr;
    }

    .example-basic {
        border-right: none;
        border-bottom: 1px solid var(--border);
    }

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

    .footer-content {
        flex-direction: column;
        gap: 12px;
    }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
    html {
        scroll-behavior: auto;
    }
}

a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}