/* debidrain landing page — single-screen layout (no scrolling) */

:root {
  --color-bg: #ffffff;
  --color-text: #0d0d0d;
  --color-muted: #5a5a5a;
  --color-accent: #e60023;
  --color-border: #d4d4d4;
  --color-disabled-bg: #f0f0f0;
  --color-disabled-text: #9a9a9a;
  --color-btn-bg: #0d0d0d;
  --color-btn-text: #ffffff;
  --max-width: 860px;
  /* viewport-relative spacing: shrinks on short screens, never below a usable floor */
  --spacing-lg: clamp(0.5rem, 2.2vh, 1.5rem);
  --spacing-md: clamp(0.35rem, 1.4vh, 1rem);
  --spacing-sm: clamp(0.2rem, 0.7vh, 0.5rem);
}

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

html {
  /* base scales with viewport height, floored at 13px for readability */
  font-size: clamp(13px, 1.6vh, 16px);
  background: var(--color-bg);
  color: var(--color-text);
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  line-height: 1.4;
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
}

/* ── Layout container ── */
header,
main,
footer {
  width: 100%;
  max-width: var(--max-width);
}

/* ── Header ── */
header {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.site-logo {
  width: clamp(36px, 7vh, 72px);
  height: clamp(36px, 7vh, 72px);
  object-fit: contain;
  flex-shrink: 0;
}

.site-wordmark {
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--color-text);
}

/* ── Main ── */
main {
  flex: 1;
  min-height: 0;
  padding: var(--spacing-md) 0;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--spacing-lg);
}

/* ── Tagline & philosophy ── */
.tagline {
  font-size: 1.15rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.philosophy {
  margin-top: var(--spacing-sm);
  color: var(--color-muted);
  font-size: max(13px, 1rem);
}

/* ── Section headings ── */
.section-title {
  font-size: max(13px, 0.75rem);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-muted);
  margin-bottom: var(--spacing-sm);
}

/* ── Download buttons ── */
.download-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: none;
}

.btn-download {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: 4px;
  font-size: max(13px, 0.9rem);
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  border: 2px solid transparent;
  transition: background-color 0.15s ease, border-color 0.15s ease, color 0.15s ease;
  /* ensure buttons don't stretch full width on mobile */
  align-self: flex-start;
}

.btn-download--primary {
  background: var(--color-btn-bg);
  color: var(--color-btn-text);
  border-color: var(--color-btn-bg);
}

.btn-download--primary:hover,
.btn-download--primary:focus-visible {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-btn-text);
  outline: none;
}

.btn-download--primary:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
}

.btn-download--disabled {
  background: var(--color-disabled-bg);
  color: var(--color-disabled-text);
  border-color: var(--color-disabled-bg);
  cursor: not-allowed;
  pointer-events: none;
}

/* ── Why list ── */
.why-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: none;
}

.why-title {
  display: block;
  font-size: max(13px, 0.95rem);
  font-weight: 600;
  color: var(--color-text);
}

.why-desc {
  display: block;
  font-size: max(13px, 0.9rem);
  color: var(--color-muted);
}

/* ── Contact links ── */
.contact-list {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
  list-style: none;
}

.contact-link {
  color: var(--color-text);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: var(--color-border);
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}

.contact-link:hover,
.contact-link:focus-visible {
  color: var(--color-accent);
  text-decoration-color: var(--color-accent);
  outline: none;
}

.contact-link:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.contact-label {
  display: block;
  font-size: max(13px, 0.8rem);
  font-weight: 400;
  color: var(--color-muted);
}

/* ── Footer ── */
footer {
  padding: var(--spacing-sm) 0 0;
  border-top: 1px solid var(--color-border);
  font-size: max(13px, 0.8rem);
  color: var(--color-muted);
  line-height: 1.35;
  flex-shrink: 0;
}

footer p + p {
  margin-top: 0.2rem;
}

/* ── Responsive ── */
@media (min-width: 480px) {
  .download-list {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* Wide + short screens (e.g. 1366x768): pair the contact list beside downloads
   so the page still fits without scrolling. */
@media (min-width: 700px) {
  .contact-list {
    flex-direction: row;
    gap: var(--spacing-lg);
  }
}

/* Viewports too small to hold the content at a readable size (phones, tiny
   windows): fall back to normal flow so nothing gets clipped. */
@media (max-width: 640px), (max-height: 380px) {
  html,
  body {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  main {
    justify-content: flex-start;
  }
}