/*
 * TabReset Landing Page
 * Aesthetic: Editorial, warm, trustworthy
 * Light theme with subtle warmth
 */

:root {
  /* Warm neutral palette */
  --color-bg: #faf9f7;
  --color-bg-subtle: #f3f1ed;
  --color-text: #2c2a25;
  --color-text-secondary: #5c5850;
  --color-text-tertiary: #8a857a;
  --color-accent: #7c6a4f;
  --color-accent-hover: #5d4f3a;
  --color-border: #e5e2dc;
  --color-code-bg: #2c2a25;
  --color-code-text: #f3f1ed;

  /* Typography */
  --font-serif: 'Source Serif 4', Georgia, serif;
  --font-sans: 'Inter', system-ui, sans-serif;

  /* Spacing scale */
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-2xl: 6rem;

  /* Sizing */
  --max-width: 42rem;
  --max-width-wide: 52rem;
}

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

main {
  padding: var(--space-md);
  padding-bottom: var(--space-2xl);
}

a {
  color: var(--color-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color 0.15s ease;
}

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

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: var(--max-width-wide);
  margin: 0 auto;
  padding: var(--space-sm) 0;
  margin-bottom: var(--space-xl);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-text);
  text-decoration: none;
}

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

.nav {
  display: flex;
  gap: var(--space-md);
}

.nav a {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  text-decoration: none;
}

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

.nav-github {
  padding: 0.4rem 0.8rem;
  background: var(--color-text);
  color: var(--color-bg) !important;
  border-radius: 4px;
  font-weight: 500;
}

.nav-github:hover {
  background: var(--color-accent-hover);
}

/* Hero */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) 0 var(--space-2xl);
  text-align: left;
}

.hero h1 {
  font-family: var(--font-serif);
  font-size: clamp(2rem, 1.5rem + 2.5vw, 3rem);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 var(--space-md);
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.lede {
  font-size: clamp(1.1rem, 1rem + 0.5vw, 1.35rem);
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0 0 var(--space-lg);
  max-width: 36rem;
}

.cta {
  display: inline-block;
  padding: 0.85rem 1.75rem;
  background: var(--color-text);
  color: var(--color-bg) !important;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 500;
  font-size: 1rem;
  transition: background 0.15s ease, transform 0.1s ease;
}

.cta:hover {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
}

/* Sections */
section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-xl) 0;
}

section + section {
  border-top: 1px solid var(--color-border);
}

h2 {
  font-family: var(--font-serif);
  font-size: clamp(1.5rem, 1.25rem + 1vw, 1.875rem);
  font-weight: 600;
  margin: 0 0 var(--space-md);
  letter-spacing: -0.01em;
}

section p {
  margin: 0 0 var(--space-sm);
  color: var(--color-text-secondary);
}

section p:last-child {
  margin-bottom: 0;
}

/* Problem section */
.problem {
  background: var(--color-bg-subtle);
  margin-left: calc(-1 * var(--space-md));
  margin-right: calc(-1 * var(--space-md));
  padding-left: var(--space-md);
  padding-right: var(--space-md);
  max-width: none;
}

.problem h2,
.problem p {
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
}

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

/* How it works */
.steps {
  list-style: none;
  padding: 0;
  margin: var(--space-lg) 0;
}

.steps li {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-lg);
}

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

.step-num {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent);
  color: var(--color-bg);
  border-radius: 50%;
  font-size: 0.875rem;
  font-weight: 600;
}

.steps strong {
  display: block;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.steps p {
  margin: 0;
  font-size: 0.95rem;
}

/* Output example */
.output-example {
  margin: var(--space-xl) 0 0;
}

.output-example figcaption {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-sm);
}

.code-block {
  background: var(--color-code-bg);
  border-radius: 6px;
  padding: var(--space-md);
  overflow-x: auto;
}

.code-block table {
  width: 100%;
  border-collapse: collapse;
  font-family: 'SF Mono', 'Monaco', 'Inconsolata', monospace;
  font-size: 0.8rem;
  color: var(--color-code-text);
}

.code-block th,
.code-block td {
  text-align: left;
  padding: 0.5rem 1rem 0.5rem 0;
  white-space: nowrap;
}

.code-block th {
  color: var(--color-text-tertiary);
  font-weight: 500;
  border-bottom: 1px solid #444;
  padding-bottom: 0.75rem;
}

.code-block td {
  padding-top: 0.75rem;
}

.link-placeholder {
  color: #8a9ba8;
}

/* Privacy */
.privacy-details {
  display: grid;
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

@media (min-width: 600px) {
  .privacy-details {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }
}

.detail strong {
  display: block;
  font-family: var(--font-serif);
  font-weight: 600;
  margin-bottom: 0.25rem;
  color: var(--color-text);
}

.detail p {
  font-size: 0.9rem;
  margin: 0;
}

/* Technical */
.technical {
  border-top: 1px solid var(--color-border);
}

/* Closing */
.closing {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.closing h2 {
  margin-bottom: var(--space-lg);
}

/* Footer */
.footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-top: var(--space-lg);
  border-top: 1px solid var(--color-border);
}

.footer p {
  font-size: 0.875rem;
  color: var(--color-text-tertiary);
  margin: 0;
}

/* Mobile adjustments */
@media (max-width: 600px) {
  :root {
    --space-xl: 3rem;
    --space-2xl: 4rem;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-sm);
  }

  .nav {
    gap: var(--space-sm);
  }

  .hero h1 br {
    display: none;
  }

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

  .code-block {
    padding: var(--space-sm);
  }

  .code-block table {
    font-size: 0.7rem;
  }

  .code-block th,
  .code-block td {
    padding-right: 0.5rem;
  }
}

/* Subtle animation on load */
@media (prefers-reduced-motion: no-preference) {
  .hero h1,
  .hero .lede,
  .hero .cta {
    animation: fadeUp 0.6s ease-out both;
  }

  .hero .lede {
    animation-delay: 0.1s;
  }

  .hero .cta {
    animation-delay: 0.2s;
  }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}