/* ============================================
   Hydriq — Design System
   Version 1.0
   ============================================ */

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

/* --- Custom Properties — Dark Theme (Default) --- */
:root {
    --color-bg: #0D1117;
    --color-surface: #161B22;
    --color-surface-raised: #1C2333;
    --color-text: #E6EDF3;
    --color-text-secondary: #8B949E;
    --color-accent: #6DD8E5;
    --color-accent-dark: #4DC0CE;
    --color-accent-hover: #8FE4ED;
    --color-accent-subtle: rgba(109,216,229,0.08);
    --color-accent-border: rgba(109,216,229,0.3);
    --color-border: #30363D;
    --color-success: #3FB950;
    --color-warning: #D29922;
    --color-hero-grad-1: rgba(109,216,229,0.12);
    --color-hero-grad-2: rgba(109,216,229,0.06);

    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', Menlo, Consolas, monospace;

    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.35);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.4);

    --max-width-narrow: 720px;
    --max-width-wide: 1040px;

    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
}

/* --- Light Theme --- */
@media (prefers-color-scheme: light) {
    :root {
        --color-bg: #FFFFFF;
        --color-surface: #F6F8FA;
        --color-surface-raised: #FFFFFF;
        --color-text: #1F2328;
        --color-text-secondary: #656D76;
        --color-accent: #0891B2;
        --color-accent-dark: #0E7490;
        --color-accent-hover: #06B6D4;
        --color-accent-subtle: rgba(8,145,178,0.06);
        --color-accent-border: rgba(8,145,178,0.2);
        --color-border: #D0D7DE;
        --color-success: #1A7F37;
        --color-warning: #9A6700;
        --color-hero-grad-1: rgba(8,145,178,0.07);
        --color-hero-grad-2: rgba(8,145,178,0.04);

        --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
        --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
        --shadow-lg: 0 8px 24px rgba(0,0,0,0.1);
    }
}

/* --- Base --- */
html { scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-hover); }

/* --- Skip Link (a11y) --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: var(--space-md);
    background: var(--color-accent);
    color: var(--color-bg);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-sm);
    font-weight: 600;
    z-index: 1000;
    transition: top 0.2s;
}
.skip-link:focus { top: var(--space-md); }

/* --- Navigation --- */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
}

/* Slight transparency for glass effect in dark */
@supports (backdrop-filter: blur(12px)) {
    .nav { background: rgba(13,17,23,0.85); }
}
@media (prefers-color-scheme: light) {
    @supports (backdrop-filter: blur(12px)) {
        .nav { background: rgba(255,255,255,0.85); }
    }
}

.nav-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    padding: var(--space-md) var(--space-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--color-text);
    white-space: nowrap;
    text-decoration: none;
}
.nav-brand:hover { color: var(--color-accent); }

.nav-brand svg {
    width: 22px;
    height: 22px;
    color: var(--color-accent);
    flex-shrink: 0;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
}
.nav-links::-webkit-scrollbar { display: none; }

.nav-links a {
    padding: var(--space-xs) var(--space-sm);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    white-space: nowrap;
    transition: color 0.2s, background 0.2s;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
    color: var(--color-accent);
    background: var(--color-accent-subtle);
}

/* --- Containers --- */
.container { max-width: var(--max-width-narrow); margin: 0 auto; padding: 0 var(--space-lg); }
.container-wide { max-width: var(--max-width-wide); margin: 0 auto; padding: 0 var(--space-lg); }

/* --- Page Content Wrapper --- */
.page-content { padding: var(--space-2xl) 0 var(--space-3xl); }

/* --- Typography --- */
h1 { font-size: 1.75rem; font-weight: 700; color: var(--color-accent); margin-bottom: var(--space-sm); line-height: 1.3; }
h2 { font-size: 1.25rem; font-weight: 600; color: var(--color-accent); margin-top: var(--space-xl); margin-bottom: var(--space-md); line-height: 1.4; }
h3 { font-size: 1.05rem; font-weight: 600; margin-top: var(--space-lg); margin-bottom: var(--space-sm); line-height: 1.4; }
p { margin-bottom: var(--space-md); }
li { margin-bottom: var(--space-sm); }
ul, ol { padding-left: var(--space-lg); }

.subtitle {
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    margin-bottom: var(--space-lg);
}

/* --- Callout / Highlight --- */
.highlight {
    background: var(--color-surface);
    border-left: 3px solid var(--color-accent);
    padding: var(--space-md);
    border-radius: var(--radius-sm);
    margin: var(--space-md) 0;
}

/* --- Tables --- */
table { width: 100%; border-collapse: collapse; margin: var(--space-md) 0; font-size: 0.95rem; }
th, td { text-align: left; padding: var(--space-sm) var(--space-md); border-bottom: 1px solid var(--color-border); }
th { color: var(--color-accent); font-weight: 600; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }

/* --- Steps (delete-data) --- */
.step {
    background: var(--color-surface);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin: var(--space-sm) 0;
}
.step-number {
    color: var(--color-accent);
    font-weight: 700;
    font-size: 1.1rem;
}

/* --- Inline Code --- */
.path, code {
    font-family: var(--font-mono);
    background: var(--color-surface);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.875em;
}

/* =============================================
   LANDING PAGE
   ============================================= */

/* Hero */
.hero {
    padding: var(--space-4xl) var(--space-lg) var(--space-3xl);
    text-align: center;
    background:
        radial-gradient(ellipse at 25% 80%, var(--color-hero-grad-1) 0%, transparent 50%),
        radial-gradient(ellipse at 75% 20%, var(--color-hero-grad-2) 0%, transparent 50%),
        var(--color-bg);
}

.hero-inner {
    max-width: 680px;
    margin: 0 auto;
}

.hero-icon {
    width: 72px;
    height: 72px;
    margin: 0 auto var(--space-lg);
    color: var(--color-accent);
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    line-height: 1.15;
    margin-bottom: var(--space-md);
    color: var(--color-text);
}
.hero-title .accent { color: var(--color-accent); }

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.2rem);
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--space-xl);
    max-width: 560px;
    margin-left: auto;
    margin-right: auto;
}

/* Trust Badges */
.trust-badges {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm) var(--space-md);
    margin-top: var(--space-xl);
}

.badge {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
    padding: var(--space-xs) var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 100px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    white-space: nowrap;
}
.badge svg { width: 14px; height: 14px; color: var(--color-accent); flex-shrink: 0; }

/* CTA Buttons */
.cta-group {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: 14px 28px;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    transition: transform 0.15s, box-shadow 0.2s, background 0.2s;
    cursor: pointer;
    border: none;
}
.btn:active { transform: scale(0.98); }

.btn-primary {
    background: var(--color-accent);
    color: #0D1117;
}
.btn-primary:hover {
    background: var(--color-accent-hover);
    color: #0D1117;
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: transparent;
    color: var(--color-accent);
    border: 1px solid var(--color-accent-border);
}
.btn-secondary:hover {
    background: var(--color-accent-subtle);
    color: var(--color-accent-hover);
}

.btn svg { width: 20px; height: 20px; }

/* Section */
.section {
    padding: var(--space-3xl) var(--space-lg);
}
.section-alt {
    background: var(--color-surface);
}

.section-header {
    text-align: center;
    max-width: 560px;
    margin: 0 auto var(--space-2xl);
}
.section-header h2 {
    font-size: clamp(1.5rem, 3vw, 1.85rem);
    margin-top: 0;
    margin-bottom: var(--space-sm);
}
.section-header p {
    color: var(--color-text-secondary);
    font-size: 1.05rem;
}

/* Feature Grid */
.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-lg);
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.feature-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}
.feature-card:hover {
    border-color: var(--color-accent-border);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.feature-icon {
    width: 40px;
    height: 40px;
    margin-bottom: var(--space-md);
    color: var(--color-accent);
}

.feature-card h3 {
    font-size: 1.1rem;
    margin-top: 0;
    margin-bottom: var(--space-sm);
    color: var(--color-text);
}
.feature-card p {
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    margin-bottom: 0;
    line-height: 1.6;
}

/* Privacy Callout */
.privacy-callout {
    max-width: var(--max-width-wide);
    margin: 0 auto;
    background: var(--color-surface-raised);
    border: 1px solid var(--color-accent-border);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl) var(--space-xl);
    text-align: center;
}
.privacy-callout h3 {
    font-size: 1.35rem;
    color: var(--color-accent);
    margin-top: 0;
    margin-bottom: var(--space-sm);
}
.privacy-callout p {
    color: var(--color-text-secondary);
    max-width: 560px;
    margin: 0 auto var(--space-md);
    font-size: 1rem;
}
.privacy-callout p:last-child { margin-bottom: 0; }

.privacy-features {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-md) var(--space-xl);
    margin-top: var(--space-lg);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}
.privacy-features span {
    display: flex;
    align-items: center;
    gap: var(--space-xs);
}
.privacy-features svg { width: 16px; height: 16px; color: var(--color-success); }

/* Comparison */
.comparison {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
    max-width: 720px;
    margin: 0 auto;
}

.plan-card {
    background: var(--color-surface-raised);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
}
.plan-card.featured {
    border-color: var(--color-accent-border);
    position: relative;
}
.plan-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-accent);
    color: #0D1117;
    font-size: 0.75rem;
    font-weight: 700;
    padding: 3px 14px;
    border-radius: 100px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.plan-card h3 {
    margin-top: 0;
    font-size: 1.25rem;
    color: var(--color-text);
}
.plan-price {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--color-text);
    margin: var(--space-sm) 0 var(--space-md);
}
.plan-price span {
    font-size: 0.9rem;
    font-weight: 400;
    color: var(--color-text-secondary);
}

.plan-features {
    list-style: none;
    padding: 0;
}
.plan-features li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-sm);
    margin-bottom: var(--space-sm);
    font-size: 0.9rem;
    color: var(--color-text-secondary);
}
.plan-features li svg {
    width: 16px;
    height: 16px;
    color: var(--color-success);
    flex-shrink: 0;
    margin-top: 3px;
}

/* Download CTA */
.download-section {
    text-align: center;
    max-width: var(--max-width-wide);
    margin: 0 auto;
}
.download-section h2 {
    font-size: clamp(1.5rem, 3vw, 1.85rem);
    margin-top: 0;
    margin-bottom: var(--space-sm);
}
.download-section p {
    color: var(--color-text-secondary);
    margin-bottom: var(--space-xl);
    font-size: 1rem;
}

/* =============================================
   FAQ / SUPPORT PAGE
   ============================================= */
.faq-group { margin-bottom: var(--space-xl); }
.faq-group-title {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: var(--space-md);
    padding-bottom: var(--space-sm);
    border-bottom: 1px solid var(--color-border);
}

.faq-item {
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-sm);
    overflow: hidden;
    transition: border-color 0.2s;
}
.faq-item[open] { border-color: var(--color-accent-border); }

.faq-item summary {
    padding: var(--space-md) var(--space-lg);
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-md);
    transition: background 0.2s;
}
.faq-item summary:hover { background: var(--color-accent-subtle); }
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::marker { display: none; content: ''; }

.faq-item summary::after {
    content: '+';
    font-size: 1.3rem;
    font-weight: 300;
    color: var(--color-text-secondary);
    transition: transform 0.2s;
    flex-shrink: 0;
}
.faq-item[open] summary::after {
    content: '\2212'; /* minus */
    color: var(--color-accent);
}

.faq-answer {
    padding: 0 var(--space-lg) var(--space-md);
    font-size: 0.925rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
}
.faq-answer p:last-child { margin-bottom: 0; }

/* Contact Card */
.contact-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--space-xl);
    text-align: center;
    margin-top: var(--space-xl);
}
.contact-card h3 {
    margin-top: 0;
    color: var(--color-text);
}
.contact-card p {
    color: var(--color-text-secondary);
    font-size: 0.95rem;
}
.contact-card .email-link {
    font-size: 1.1rem;
    font-weight: 600;
}

/* =============================================
   FOOTER
   ============================================= */
.site-footer {
    border-top: 1px solid var(--color-border);
    padding: var(--space-xl) var(--space-lg);
    text-align: center;
}
.footer-inner {
    max-width: var(--max-width-wide);
    margin: 0 auto;
}

.footer-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--space-sm) var(--space-lg);
    margin-bottom: var(--space-md);
}
.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}
.footer-links a:hover { color: var(--color-accent); }

.footer-copy {
    font-size: 0.8rem;
    color: var(--color-text-secondary);
}

/* =============================================
   PRINT
   ============================================= */
@media print {
    :root {
        --color-bg: #fff;
        --color-surface: #f5f5f5;
        --color-surface-raised: #fff;
        --color-text: #000;
        --color-text-secondary: #333;
        --color-accent: #0891B2;
        --color-border: #ccc;
    }
    .nav, .skip-link, .cta-group, .trust-badges, .btn { display: none !important; }
    body { padding: 20px; font-size: 11pt; }
    .hero { padding: 20px 0; background: none !important; }
    .feature-card, .plan-card, .faq-item { break-inside: avoid; }
    a { color: #000; text-decoration: underline; }
    a[href]::after { content: " (" attr(href) ")"; font-size: 0.8em; color: #555; }
    .footer-links a[href]::after { content: none; }
}

/* =============================================
   RESPONSIVE
   ============================================= */
@media (max-width: 768px) {
    .hero { padding: var(--space-3xl) var(--space-md) var(--space-2xl); }
    .section { padding: var(--space-2xl) var(--space-md); }
    .container, .container-wide { padding: 0 var(--space-md); }

    .comparison {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .nav-inner { padding: var(--space-sm) var(--space-md); }
}

@media (max-width: 480px) {
    .hero-title { font-size: 1.75rem; }
    .hero-subtitle { font-size: 0.95rem; }
    .btn { padding: 12px 22px; font-size: 0.925rem; }
    .feature-grid { grid-template-columns: 1fr; }
    .nav-links a { font-size: 0.8rem; padding: var(--space-xs) 6px; }
    .faq-item summary { padding: var(--space-md); font-size: 0.9rem; }
    .faq-answer { padding: 0 var(--space-md) var(--space-md); }
}