/* ============================================
   Digitally Prepped — Dark Theme Stylesheet
   Mobile-first, privacy-first (no external fonts)
   ============================================ */

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

:root {
    --bg: #0a0a0a;
    --bg-surface: #111111;
    --bg-elevated: #1a1a1a;
    --text: #f0f0f0;
    --text-muted: #999999;
    --text-dim: #949494;
    --accent: #00d4aa;
    --accent-hover: #00f0c0;
    --accent-dim: rgba(0, 212, 170, 0.15);
    --border: #222222;
    --max-width: 720px;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 5rem;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    background: var(--bg);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        "Helvetica Neue", Arial, "Noto Sans", sans-serif, "Apple Color Emoji",
        "Segoe UI Emoji", "Segoe UI Symbol", "Noto Color Emoji";
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

a:focus-visible, button:focus-visible, input:focus-visible, [type="checkbox"]:focus-visible {
    outline: 2px solid var(--accent);
    outline-offset: 2px;
}

.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    background: var(--accent);
    color: var(--bg);
    padding: 0.5rem 1rem;
    z-index: 200;
    font-weight: 700;
}
.skip-link:focus {
    top: 0;
}

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

img {
    max-width: 100%;
    height: auto;
}

/* --- Navigation --- */
nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-bottom: 1px solid var(--border);
    padding: var(--spacing-sm) var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

nav .logo {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.02em;
}

nav .logo span {
    color: var(--accent);
}

.lang-switcher {
    display: flex;
    gap: var(--spacing-xs);
    list-style: none;
}

.lang-switcher a {
    display: inline-block;
    padding: 0.25rem 0.5rem;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--border);
    border-radius: 4px;
}

.lang-switcher a:hover {
    color: var(--accent);
    border-color: var(--accent);
    text-decoration: none;
}

.lang-switcher a.active {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--accent-dim);
}

/* --- Section Base --- */
section, .trust-bar {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-xl) var(--spacing-md);
}

/* --- Hero --- */
.hero {
    padding-top: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    text-align: center;
}

.hero h1 {
    font-size: 2rem;
    font-weight: 800;
    line-height: 1.2;
    color: var(--text);
    margin-bottom: var(--spacing-sm);
    letter-spacing: -0.03em;
}

.hero .subline {
    font-size: 1.15rem;
    color: var(--text-muted);
    max-width: 560px;
    margin: 0 auto var(--spacing-md);
    line-height: 1.5;
}

.hero-cta {
    display: inline-block;
    margin: var(--spacing-sm) auto var(--spacing-md);
    padding: 0.8rem 2rem;
    background: var(--accent);
    color: var(--bg);
    font-weight: 700;
    font-size: 1rem;
    border-radius: 6px;
    text-decoration: none;
    transition: background 0.2s;
}
.hero-cta:hover {
    background: var(--accent-hover);
    text-decoration: none;
    color: var(--bg);
}

.hero blockquote {
    margin: var(--spacing-md) auto 0;
    padding: var(--spacing-sm) var(--spacing-md);
    border-left: 3px solid var(--accent);
    background: var(--bg-surface);
    border-radius: 0 6px 6px 0;
    max-width: 520px;
    font-style: italic;
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.6;
}

.hero blockquote cite {
    display: block;
    margin-top: var(--spacing-xs);
    font-style: normal;
    font-size: 0.8rem;
    color: var(--text-dim);
}

/* --- Features --- */
.features {
    border-top: 1px solid var(--border);
}

.features h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.features ul {
    list-style: none;
    padding: 0;
}

.features li {
    position: relative;
    padding: 0.75rem 0 0.75rem 1.75rem;
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.5;
}

.features li::before {
    content: "\2713";
    position: absolute;
    left: 0;
    color: var(--accent);
    font-weight: 700;
    font-size: 1.1rem;
}

.features li + li {
    border-top: 1px solid var(--border);
}

/* --- Chapter Preview --- */
.preview {
    border-top: 1px solid var(--border);
}

.preview h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.preview-content {
    color: var(--text-muted);
    line-height: 1.7;
    font-size: 0.95rem;
    max-height: 600px;
    overflow: hidden;
    position: relative;
}

.preview-content p {
    margin-bottom: 1rem;
}

.preview-content h3 {
    color: var(--text);
    font-size: 1.1rem;
    font-weight: 700;
    margin: 1.5rem 0 0.75rem;
}

.preview-content strong {
    color: var(--text);
}

.preview-content::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 120px;
    background: linear-gradient(transparent, var(--bg));
    pointer-events: none;
}

.preview-fade {
    text-align: center;
    color: var(--accent);
    font-weight: 700;
    font-size: 1rem;
    margin-top: var(--spacing-sm);
}

/* --- Signup --- */
.signup {
    text-align: center;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: var(--spacing-lg) var(--spacing-md);
    margin-left: var(--spacing-md);
    margin-right: var(--spacing-md);
    max-width: var(--max-width);
}

@media (min-width: 768px) {
    .signup {
        margin-left: auto;
        margin-right: auto;
    }
}

.signup h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.signup form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    max-width: 560px;
    margin: var(--spacing-md) auto 0;
}

@media (min-width: 768px) {
    .signup form {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .signup form .consent {
        flex-basis: 100%;
    }
}

.signup input[type="email"] {
    width: 100%;
    flex: 1;
    min-width: 0;
    padding: 0.9rem 1rem;
    font-size: 1rem;
    font-family: inherit;
    background: var(--bg);
    color: var(--text);
    border: 1px solid var(--border);
    border-radius: 6px;
    outline: none;
}

.signup input[type="email"]:focus {
    border-color: var(--accent);
    box-shadow: 0 0 0 3px var(--accent-dim);
}

.signup input[type="email"]::placeholder {
    color: var(--text-dim);
}

.signup button {
    width: 100%;
    padding: 0.9rem 1.5rem;
    font-size: 1.05rem;
    font-weight: 700;
    font-family: inherit;
    color: var(--bg);
    background: var(--accent);
    border: none;
    border-radius: 6px;
    cursor: pointer;
    letter-spacing: 0.01em;
}

.signup button:hover {
    background: var(--accent-hover);
}

.signup button:active {
    transform: scale(0.98);
}

.consent {
    display: flex;
    align-items: flex-start;
    gap: 0.5rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    text-align: left;
    cursor: pointer;
}

.consent input[type="checkbox"] {
    margin-top: 0.2rem;
    accent-color: var(--accent);
    flex-shrink: 0;
}

.privacy-note {
    margin-top: var(--spacing-sm);
    font-size: 0.8rem;
    color: var(--text-dim);
    line-height: 1.5;
}

/* --- About --- */
.about {
    border-top: 1px solid var(--border);
}

.about h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.about p {
    color: var(--text-muted);
    line-height: 1.7;
    font-size: 1rem;
}

.about-inner {
    display: flex;
    gap: var(--spacing-md);
    align-items: flex-start;
}

.author-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    border: 2px solid var(--accent);
    flex-shrink: 0;
}

@media (max-width: 480px) {
    .about-inner {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }
}

/* --- Trust Bar --- */
.trust-bar {
    border-top: 1px solid var(--border);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-md);
    padding-top: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
}

.trust-item {
    font-size: 0.85rem;
    color: var(--text-dim);
    text-align: center;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: var(--bg-surface);
    white-space: nowrap;
}

/* --- Related Topics --- */
.related {
    border-top: 1px solid var(--border);
}

.related h2 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.related-links {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
}

@media (min-width: 600px) {
    .related-links {
        grid-template-columns: 1fr 1fr 1fr;
    }
}

.related-link {
    display: block;
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: border-color 0.2s, color 0.2s;
}

.related-link:hover {
    border-color: var(--accent);
    color: var(--accent);
    text-decoration: none;
}

/* --- Footer --- */
footer {
    border-top: 1px solid var(--border);
    text-align: center;
    padding: var(--spacing-md);
    font-size: 0.8rem;
    color: var(--text-dim);
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm) var(--spacing-md);
}

footer a {
    color: var(--text-muted);
}

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

footer p {
    width: 100%;
    margin-top: var(--spacing-xs);
}

/* --- Thank You Page --- */
.thankyou {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-md);
    max-width: var(--max-width);
    margin: 0 auto;
    min-height: 60vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.thankyou h1 {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--accent);
    margin-bottom: var(--spacing-sm);
}

.thankyou p {
    font-size: 1.1rem;
    color: var(--text-muted);
    line-height: 1.6;
}

/* --- Legal Pages --- */
.legal {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

.legal h1 {
    font-size: 1.6rem;
    font-weight: 800;
    margin-bottom: var(--spacing-md);
    color: var(--text);
}

.legal h2 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-top: var(--spacing-md);
    margin-bottom: var(--spacing-sm);
    color: var(--text);
}

.legal p, .legal li {
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.legal ul {
    padding-left: 1.5rem;
    margin-bottom: var(--spacing-sm);
}

/* --- Responsive --- */
@media (min-width: 768px) {
    .hero h1 {
        font-size: 2.8rem;
    }

    .hero .subline {
        font-size: 1.25rem;
    }

    section, .trust-bar {
        padding-left: var(--spacing-lg);
        padding-right: var(--spacing-lg);
    }

    .signup form {
        flex-direction: row;
    }

    .signup input[type="email"] {
        flex: 1;
    }

    .signup button {
        width: auto;
        white-space: nowrap;
    }
}

@media (min-width: 1024px) {
    .hero h1 {
        font-size: 3.2rem;
    }
}