/* AI Prompt Studio — GitHub Pages Stylesheet */

:root {
    --bg: #000000;
    --text: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #007AFF;
    --accent-hover: #0062d1;
    --card-bg: #1c1c1e;
    --border: #2c2c2e;
    --max-width: 800px;
}

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

html {
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: -apple-system, BlinkMacSystemFont, 'SF Pro', 'SF Pro Text', sans-serif;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* Layout */

.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 24px;
}

/* Navigation */

nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(0, 0, 0, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
    padding: 16px 0;
}

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

nav .logo {
    font-size: 18px;
    font-weight: 600;
    color: var(--text);
    text-decoration: none;
}

nav .nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin-left: 24px;
    font-size: 15px;
    transition: color 0.2s;
}

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

/* Hero */

.hero {
    text-align: center;
    padding: 80px 0 60px;
}

.hero .app-icon {
    width: 120px;
    height: 120px;
    border-radius: 27px;
    margin-bottom: 24px;
}

.hero-image {
    width: 300px;
    height: auto;
    border-radius: 20px;
    margin-bottom: 24px;
    box-shadow: 0 4px 16px rgba(0, 122, 255, 0.15);
}

.hero h1 {
    font-size: 48px;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 12px;
}

.hero .tagline {
    font-size: 22px;
    color: var(--text-secondary);
    margin-bottom: 36px;
}

.app-store-badge {
    display: inline-block;
    transition: opacity 0.2s;
}

.app-store-badge:hover {
    opacity: 0.8;
}

.app-store-badge img {
    height: 54px;
}

/* Section */

section {
    padding: 60px 0;
}

section h2 {
    font-size: 32px;
    font-weight: 600;
    margin-bottom: 32px;
    text-align: center;
}

/* Features Grid */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
}

.feature-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 20px;
    text-align: center;
    font-size: 15px;
    transition: border-color 0.2s;
    cursor: pointer;
}

.feature-card:hover {
    border-color: var(--accent);
}

.feature-card summary {
    list-style: none;
    display: block;
}

.feature-card summary::-webkit-details-marker {
    display: none;
}

.feature-card[open] {
    border-color: var(--accent);
}

.feature-desc {
    margin-top: 12px;
    font-size: 13px;
    color: var(--text-secondary);
    line-height: 1.6;
    text-align: center;
}

.feature-icon {
    font-size: 28px;
    margin-bottom: 8px;
    display: block;
}

/* How It Works */

.how-it-works {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 24px;
    margin-top: 32px;
}

.step {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 28px 20px;
    text-align: center;
}

.step-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--accent);
    color: var(--text);
    border-radius: 50%;
    font-weight: 600;
    font-size: 16px;
    margin-bottom: 12px;
}

.step h3 {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 8px;
}

.step p {
    font-size: 14px;
    color: var(--text-secondary);
}

/* Providers */

.providers {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-top: 16px;
}

.provider-tag {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 20px;
    padding: 8px 16px;
    font-size: 14px;
    color: var(--text-secondary);
}

/* CTA */

.cta {
    text-align: center;
    padding: 60px 0 80px;
}

.cta h2 {
    margin-bottom: 16px;
}

.cta p {
    color: var(--text-secondary);
    margin-bottom: 32px;
    font-size: 17px;
}

/* Footer */

footer {
    border-top: 1px solid var(--border);
    padding: 32px 0;
    text-align: center;
}

footer .footer-links {
    margin-bottom: 16px;
}

footer .footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    margin: 0 16px;
    font-size: 14px;
    transition: color 0.2s;
}

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

footer .copyright {
    font-size: 13px;
    color: var(--text-secondary);
}

/* Links */

a {
    color: var(--accent);
    text-decoration: none;
    transition: color 0.2s;
}

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

/* Page Header (Privacy, Support) */

.page-header {
    padding: 60px 0 32px;
    text-align: center;
    border-bottom: 1px solid var(--border);
    margin-bottom: 40px;
}

.page-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 8px;
}

.page-header .subtitle {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Content Sections (Privacy, Support) */

.content-section {
    margin-bottom: 36px;
}

.content-section h2 {
    font-size: 22px;
    font-weight: 600;
    text-align: left;
    margin-bottom: 12px;
    color: var(--accent);
}

.content-section p,
.content-section li {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.content-section ul {
    list-style: none;
    padding: 0;
    margin: 12px 0;
}

.content-section ul li {
    padding: 4px 0 4px 20px;
    position: relative;
}

.content-section ul li::before {
    content: "\2022";
    color: var(--accent);
    position: absolute;
    left: 4px;
}

.content-section a {
    color: var(--accent);
}

/* FAQ */

.faq-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 24px;
    margin-bottom: 16px;
}

.faq-item h3 {
    font-size: 17px;
    font-weight: 600;
    margin-bottom: 8px;
}

.faq-item p,
.faq-item li {
    color: var(--text-secondary);
    font-size: 15px;
    line-height: 1.7;
}

.faq-item ul {
    list-style: none;
    padding: 0;
    margin: 8px 0 0;
}

.faq-item ul li {
    padding: 2px 0 2px 20px;
    position: relative;
}

.faq-item ul li::before {
    content: "\2022";
    color: var(--accent);
    position: absolute;
    left: 4px;
}

/* Contact Card */

.contact-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 32px;
    text-align: center;
    margin-bottom: 48px;
}

.contact-card p {
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 16px;
}

.contact-card .email-link {
    font-size: 18px;
    font-weight: 600;
    color: var(--accent);
}

/* Back link */

.back-link {
    display: inline-block;
    margin-top: 40px;
    margin-bottom: 40px;
    font-size: 15px;
    color: var(--accent);
}

.back-link::before {
    content: "\2190 ";
}

/* Form */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg);
    border: 1px solid var(--border);
    border-radius: 10px;
    color: var(--text);
    font-size: 16px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.submit-btn {
    width: 100%;
    padding: 14px;
    background: var(--accent);
    color: var(--text);
    border: none;
    border-radius: 12px;
    font-size: 17px;
    font-weight: 600;
    font-family: inherit;
    cursor: pointer;
    transition: background 0.2s;
    margin-top: 8px;
}

.submit-btn:hover {
    background: var(--accent-hover);
}

/* Responsive */

@media (max-width: 600px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero .tagline {
        font-size: 18px;
    }

    section h2 {
        font-size: 26px;
    }

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

    .how-it-works {
        grid-template-columns: 1fr;
    }

    nav .nav-links a {
        margin-left: 16px;
        font-size: 14px;
    }
}