/* ============================================
   hztz — Landing Page
   Palette: #EBECEE / #262626 / #264A75 / #C28B5B
   ============================================ */

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

:root {
    --color-bg: #EBECEE;
    --color-surface: #ffffff;
    --color-text: #262626;
    --color-text-muted: #5c5c5c;
    --color-accent: #264A75;
    --color-accent-hover: #1c3859;
    --color-accent-text: #ffffff;
    --color-secondary: #C28B5B;
    --color-border: rgba(38, 38, 38, 0.1);
    --color-code-bg: #e2e3e6;
    --color-shadow: rgba(38, 74, 117, 0.08);
    --color-shadow-hover: rgba(38, 74, 117, 0.14);

    --font-sans: 'Outfit', system-ui, sans-serif;
    --font-display: 'Source Serif 4', Georgia, serif;
    --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

    --max-width: 1080px;
    --space-xs: 0.5rem;
    --space-sm: 1rem;
    --space-md: 1.75rem;
    --space-lg: 3rem;
    --space-xl: 5.5rem;

    --radius: 12px;
    --radius-sm: 8px;
    --transition: 0.22s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 17px;
    line-height: 1.7;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

/* ============================================
   Navigation
   ============================================ */
nav {
    position: sticky;
    top: 0;
    background: rgba(235, 236, 238, 0.88);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    z-index: 100;
}

.nav-content {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 1rem var(--space-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-sm);
}

.logo {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 1.05rem;
    letter-spacing: -0.02em;
    color: var(--color-text);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: color var(--transition);
}

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

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 1.75rem;
    height: 1.75rem;
    border-radius: 6px;
    background: var(--color-accent);
    color: var(--color-accent-text);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: -0.04em;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    justify-content: flex-end;
}

.nav-links a {
    color: var(--color-text-muted);
    text-decoration: none;
    font-size: 0.9rem;
    font-weight: 500;
    transition: color var(--transition);
}

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

/* ============================================
   Main Layout
   ============================================ */
main {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md);
}

section {
    margin-bottom: var(--space-xl);
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4 {
    font-family: var(--font-display);
    font-weight: 600;
    line-height: 1.25;
    color: var(--color-text);
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(2rem, 4.5vw, 2.85rem);
    font-weight: 600;
}

h2 {
    font-size: clamp(1.6rem, 3vw, 2rem);
    margin-bottom: var(--space-sm);
}

h3 {
    font-size: 1.2rem;
    margin-bottom: var(--space-xs);
    font-family: var(--font-sans);
    font-weight: 600;
    letter-spacing: -0.01em;
}

h4 {
    font-size: 1rem;
    margin: var(--space-md) 0 var(--space-xs);
    color: var(--color-text-muted);
    font-family: var(--font-sans);
}

p {
    margin-bottom: var(--space-sm);
}

.lead {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-md);
    max-width: 38rem;
}

.note {
    font-size: 0.875rem;
    color: var(--color-text-muted);
    margin-bottom: 0;
}

/* ============================================
   Hero
   ============================================ */
.hero {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: center;
    text-align: left;
    padding: calc(var(--space-xl) * 0.45) 0 var(--space-lg);
}

.hero-copy {
    min-width: 0;
}

.hero-brand {
    font-family: var(--font-sans);
    font-size: clamp(3.25rem, 7vw, 5.5rem);
    font-weight: 700;
    line-height: 0.95;
    letter-spacing: -0.06em;
    color: var(--color-accent);
    margin-bottom: var(--space-md);
}

.hero h1 {
    max-width: 16ch;
    margin-bottom: var(--space-md);
    font-size: clamp(1.3rem, 2.4vw, 1.75rem);
    font-weight: 500;
    line-height: 1.35;
}

.hero .description {
    max-width: 28rem;
    margin: 0 0 var(--space-md);
    color: var(--color-text-muted);
    font-size: 1.05rem;
}

.hero-actions {
    display: flex;
    gap: var(--space-sm);
    flex-wrap: wrap;
    margin-bottom: 0;
}

.hero-terminal {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 12px 40px var(--color-shadow);
    overflow: hidden;
    transition: box-shadow var(--transition), transform var(--transition);
    min-width: 0;
}

.hero-terminal:hover {
    box-shadow: 0 18px 48px var(--color-shadow-hover);
    transform: translateY(-2px);
}

.terminal-bar {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    padding: 0.75rem 1rem;
    background: var(--color-code-bg);
    border-bottom: 1px solid var(--color-border);
}

.terminal-bar span {
    width: 0.55rem;
    height: 0.55rem;
    border-radius: 50%;
    background: rgba(38, 38, 38, 0.18);
}

.terminal-bar span:nth-child(1) { background: var(--color-secondary); opacity: 0.7; }
.terminal-bar span:nth-child(2) { background: var(--color-secondary); opacity: 0.45; }
.terminal-bar span:nth-child(3) { background: var(--color-accent); opacity: 0.35; }

.terminal-bar code {
    margin-left: 0.75rem;
    background: none;
    padding: 0;
    font-size: 0.75rem;
    color: var(--color-text-muted);
}

.terminal-body {
    padding: 1.15rem 1.25rem;
    overflow-x: auto;
}

.terminal-body code {
    font-family: var(--font-mono);
    font-size: 0.78rem;
    line-height: 1.65;
    color: var(--color-text);
    background: none;
    padding: 0;
    white-space: pre-wrap;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 0.85rem 1.5rem;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: var(--font-sans);
    text-decoration: none;
    border-radius: var(--radius-sm);
    transition: background var(--transition), color var(--transition),
                border-color var(--transition), transform var(--transition),
                box-shadow var(--transition);
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-accent-text);
    box-shadow: 0 4px 14px rgba(38, 74, 117, 0.22);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 8px 20px rgba(38, 74, 117, 0.28);
}

.btn-secondary {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover {
    border-color: var(--color-accent);
    color: var(--color-accent);
    transform: translateY(-1px);
}

/* ============================================
   About
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
}

.about-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: var(--space-md);
    box-shadow: 0 8px 28px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.about-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 36px var(--color-shadow-hover);
}

.about-card h3 {
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

.about-card p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================
   Features Grid
   ============================================ */
.features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-md);
    margin-top: var(--space-md);
}

.feature {
    text-align: left;
    padding: var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 8px 28px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.feature:hover {
    transform: translateY(-3px);
    box-shadow: 0 14px 36px var(--color-shadow-hover);
    border-color: rgba(38, 74, 117, 0.2);
}

.feature-icon {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--color-secondary);
    margin-bottom: var(--space-sm);
    letter-spacing: 0.04em;
}

.feature h3 {
    margin-bottom: 0.65rem;
}

.feature h3 code {
    font-size: 1em;
    background: transparent;
    padding: 0;
    color: var(--color-accent);
}

.feature p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: 0;
}

/* ============================================
   Examples
   ============================================ */
.example-meta {
    margin-bottom: var(--space-sm);
}

.example-meta p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin: 0;
}

.quote-card {
    margin: var(--space-sm) 0 0;
    padding: var(--space-sm) var(--space-md);
    border-left: 3px solid var(--color-secondary);
    background: var(--color-bg);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.quote-card p {
    margin: 0;
    font-size: 0.95rem;
    color: var(--color-text);
    font-style: italic;
}

.output-block pre {
    background: #f4f4f5;
}

.tab-content .code-block:last-child,
.tab-content .quote-card:last-child {
    margin-bottom: 0;
}

/* ============================================
   Quick Start / Steps
   ============================================ */
.steps {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.step {
    display: flex;
    gap: var(--space-md);
    padding: var(--space-md);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 6px 22px var(--color-shadow);
    transition: transform var(--transition), box-shadow var(--transition);
}

.step:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 30px var(--color-shadow-hover);
}

.step-number {
    flex-shrink: 0;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent);
    color: var(--color-accent-text);
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 50%;
}

.step-content {
    flex: 1;
    min-width: 0;
}

.step-content h3 {
    margin-bottom: 0.35rem;
}

.step-content > p {
    font-size: 0.95rem;
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

/* ============================================
   Code Blocks
   ============================================ */
.code-block {
    position: relative;
    margin: var(--space-xs) 0 var(--space-sm);
}

.code-block:last-child {
    margin-bottom: 0;
}

.code-block pre {
    background: var(--color-code-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: var(--space-sm) var(--space-md);
    padding-right: 4.5rem;
    overflow-x: auto;
}

.code-block code {
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.65;
    color: var(--color-text);
}

.copy-btn {
    position: absolute;
    top: var(--space-xs);
    right: var(--space-xs);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 0.3rem 0.6rem;
    font-size: 0.75rem;
    font-family: var(--font-sans);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: all var(--transition);
}

.copy-btn:hover {
    background: var(--color-bg);
    color: var(--color-accent);
    border-color: rgba(38, 74, 117, 0.25);
}

.copy-btn.copied {
    background: var(--color-accent);
    color: var(--color-accent-text);
    border-color: var(--color-accent);
}

code {
    font-family: var(--font-mono);
    font-size: 0.875em;
    background: var(--color-code-bg);
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

pre code {
    background: none;
    padding: 0;
}

/* ============================================
   Placeholder
   ============================================ */
.placeholder-card {
    background: var(--color-surface);
    border: 1px dashed rgba(38, 74, 117, 0.28);
    border-radius: var(--radius);
    padding: var(--space-md) var(--space-lg);
    box-shadow: 0 4px 16px var(--color-shadow);
}

.placeholder-card.compact {
    padding: var(--space-md);
}

.placeholder-label {
    display: inline-block;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-secondary);
    margin-bottom: 0.5rem;
}

.placeholder-card p {
    color: var(--color-text-muted);
}

.placeholder-card p:last-child {
    margin-bottom: 0;
}

.placeholder-inline {
    font-family: var(--font-mono);
    font-size: 0.8rem;
    color: var(--color-text-muted);
}

/* ============================================
   Tabs Panel
   ============================================ */
.tab-panel {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 8px 28px var(--color-shadow);
    overflow: hidden;
}

.tab-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    padding: 0.65rem 0.75rem 0;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-bg);
}

.tab-btn {
    background: transparent;
    border: none;
    border-bottom: 2px solid transparent;
    padding: 0.85rem 1rem;
    margin-bottom: -1px;
    font-size: 0.9rem;
    font-family: var(--font-sans);
    font-weight: 500;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition), background var(--transition);
    border-radius: var(--radius-sm) var(--radius-sm) 0 0;
}

.tab-btn:hover {
    color: var(--color-text);
    background: rgba(255, 255, 255, 0.55);
}

.tab-btn.active {
    color: var(--color-accent);
    border-bottom-color: var(--color-accent);
    background: var(--color-surface);
}

.tab-content {
    display: none;
    padding: var(--space-md);
    animation: tabFade 0.2s ease;
}

.tab-content.active {
    display: block;
}

.tab-content > p {
    color: var(--color-text-muted);
    margin-bottom: var(--space-sm);
}

.tab-content .options-table {
    margin: 0;
    box-shadow: none;
    border: 1px solid var(--color-border);
}

.tab-content .placeholder-card {
    box-shadow: none;
}

@keyframes tabFade {
    from { opacity: 0; transform: translateY(4px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ============================================
   Tables
   ============================================ */
.options-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    font-size: 0.9rem;
    margin: var(--space-sm) 0;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: 0 6px 22px var(--color-shadow);
}

.options-table th,
.options-table td {
    text-align: left;
    padding: 0.85rem 1rem;
    border-bottom: 1px solid var(--color-border);
    vertical-align: top;
}

.options-table th {
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    background: var(--color-code-bg);
    color: var(--color-text-muted);
}

.options-table tr:last-child td {
    border-bottom: none;
}

.options-table td:first-child {
    white-space: nowrap;
    width: 1%;
}

.options-table code {
    font-size: 0.8125rem;
    color: var(--color-accent);
    background: transparent;
    padding: 0;
}

/* ============================================
   Guide Sections
   ============================================ */
.guide-section {
    margin-bottom: var(--space-lg);
    padding-bottom: var(--space-lg);
    border-bottom: 1px solid var(--color-border);
}

.guide-section:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.guide-section h3 {
    font-size: 1.25rem;
    margin-bottom: var(--space-sm);
}

.guide-section > p {
    color: var(--color-text-muted);
}

/* ============================================
   FAQ
   ============================================ */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 0.65rem;
}

.faq-list details {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: 0 6px 22px var(--color-shadow);
    overflow: hidden;
    transition: box-shadow var(--transition), border-color var(--transition);
}

.faq-list details:hover {
    box-shadow: 0 10px 28px var(--color-shadow-hover);
}

.faq-list details[open] {
    border-color: rgba(38, 74, 117, 0.22);
}

.faq-list summary {
    cursor: pointer;
    padding: 1.05rem 1.25rem;
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text);
    user-select: none;
    list-style: none;
    transition: color var(--transition);
}

.faq-list summary::-webkit-details-marker {
    display: none;
}

.faq-list summary::after {
    content: '+';
    float: right;
    font-family: var(--font-mono);
    font-weight: 500;
    color: var(--color-secondary);
    transition: transform var(--transition);
}

.faq-list details[open] summary::after {
    content: '−';
}

.faq-list summary:hover {
    color: var(--color-accent);
}

.details-content {
    padding: 0 1.25rem 1.15rem;
    font-size: 0.95rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    padding-top: 0.9rem;
    margin: 0 0.15rem;
}

.details-content p {
    margin-bottom: var(--space-xs);
}

.details-content p:last-child {
    margin-bottom: 0;
}

.details-content ul {
    margin: 0 0 0 1.1rem;
}

.details-content li {
    margin-bottom: 0.4rem;
}

.details-content li:last-child {
    margin-bottom: 0;
}

.details-content .placeholder-label {
    display: block;
}

/* ============================================
   Footer
   ============================================ */
footer {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: var(--space-lg) var(--space-md) var(--space-xl);
    border-top: 1px solid var(--color-border);
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.footer-brand {
    font-family: var(--font-sans);
    font-weight: 700;
    font-size: 1.25rem;
    letter-spacing: -0.03em;
    color: var(--color-accent);
    margin-bottom: 0.35rem;
}

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

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

footer .credit {
    margin-top: var(--space-sm);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 720px) {
    :root {
        --space-lg: 2.25rem;
        --space-xl: 3.5rem;
    }

    body {
        font-size: 16px;
    }

    .nav-links {
        gap: 0.85rem;
    }

    .nav-links a {
        font-size: 0.8rem;
    }

    .hero {
        grid-template-columns: 1fr;
        padding-top: var(--space-md);
        gap: var(--space-md);
    }

    .hero h1 {
        max-width: 20ch;
    }

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

    .step {
        flex-direction: column;
        gap: var(--space-sm);
    }

    .options-table {
        display: block;
        overflow-x: auto;
    }

    .options-table td:first-child {
        white-space: normal;
    }

    .tab-buttons {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }

    .tab-btn {
        white-space: nowrap;
        padding: 0.75rem 0.85rem;
        font-size: 0.82rem;
    }
}

@media (max-width: 480px) {
    .nav-content {
        flex-direction: column;
        align-items: flex-start;
    }

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

    .btn {
        width: 100%;
        text-align: center;
    }
}