/* Refract — Dark grey base, logo blue as accent (no pure black) */

:root {
  --color-bg: #141414;
  --color-surface: #1a1a1a;
  --color-surface-elevated: #1f1f1f;
  --color-text: #f5f5f7;
  --color-text-muted: #a1a1a6;
  --color-text-tertiary: #6e6e73;
  --color-primary: #5b7a9a;
  --color-primary-hover: #6b8aaa;
  --color-accent: #f5f5f7;
  --color-border: rgba(255, 255, 255, 0.07);
  --color-border-strong: rgba(255, 255, 255, 0.1);
  --color-logo-blue: #3d5166;
  --color-logo-blue-light: #455a6e;
  --font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", sans-serif;
  --font-mono: "SF Mono", ui-monospace, "Cascadia Code", monospace;
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 720px;
  --header-height: 52px;
}

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

html {
  font-size: 18px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-weight: 400;
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.5;
  letter-spacing: -0.01em;
}

/* Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-height);
  background: rgba(20, 20, 20, 0.82);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
}

.site-header-inner {
  max-width: 980px;
  margin: 0 auto;
  padding: 0 1.5rem;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--color-text);
  text-decoration: none;
  transition: opacity 0.22s ease;
}

.site-logo:hover {
  opacity: 0.85;
}

/* App-icon-style background (matches AppIcon.icon fill + shadow) */
.site-logo-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: linear-gradient(165deg, #455a6e 0%, #3d5166 50%, #334558 100%);
  box-shadow: 0 2px 8px rgba(20, 20, 20, 0.5);
  flex-shrink: 0;
  opacity: 0.72;
}

.site-logo-icon .site-logo-img {
  display: block;
  width: 20px;
  height: 20px;
  object-fit: contain;
}

.site-logo-text {
  font-size: 1.125rem;
  font-weight: 200;
  letter-spacing: -0.025em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.site-nav a {
  color: var(--color-text-muted);
  text-decoration: none;
  font-size: 0.944rem;
  font-weight: 400;
  transition: color 0.22s ease;
}

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

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 3rem 1.5rem 5rem;
}

/* Typography — larger, thinner, Apple-style */
h1 {
  font-size: 2.5rem;
  font-weight: 200;
  letter-spacing: -0.04em;
  line-height: 1.1;
  margin: 0 0 0.75rem;
  color: var(--color-text);
}

h2 {
  font-size: 1.75rem;
  font-weight: 300;
  letter-spacing: -0.03em;
  margin: 2.5rem 0 0.75rem;
  color: var(--color-text);
}

h3 {
  font-size: 1.25rem;
  font-weight: 400;
  letter-spacing: -0.02em;
  margin: 1.75rem 0 0.5rem;
  color: var(--color-text);
}

p {
  margin: 0 0 1.25rem;
  color: var(--color-text-muted);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.6;
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
  color: var(--color-text-muted);
  margin-bottom: 2rem;
  line-height: 1.5;
}

/* Cards / Sections */
.page-header {
  margin-bottom: 2.5rem;
}

.content-card {
  background: var(--color-surface-elevated);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  padding: 2rem 2rem;
  margin-bottom: 1.5rem;
}

.content-card h2:first-child,
.content-card h3:first-child {
  margin-top: 0;
}

/* Lists */
ul, ol {
  margin: 0 0 1.25rem;
  padding-left: 1.5rem;
  color: var(--color-text-muted);
}

li {
  margin-bottom: 0.5rem;
  line-height: 1.5;
}

/* Links — elegant hover with animated underline */
a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color 0.25s ease;
}

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

/* Animated underline for content links (main, product sections, cards) */
main a:not(.btn):not(.btn-cta)::after,
.content-card a::after,
.product-section a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: currentColor;
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 0.28s cubic-bezier(0.33, 1, 0.68, 1);
}

main a:not(.btn):not(.btn-cta):hover::after,
.content-card a:hover::after,
.product-section a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

main a:not(.btn):not(.btn-cta),
.content-card a,
.product-section a {
  position: relative;
}

/* Contact form */
.form-group {
  margin-bottom: 1.5rem;
}

.form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-bottom: 0.5rem;
}

.form-group input,
.form-group textarea {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 400;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface-elevated);
  color: var(--color-text);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--color-text-tertiary);
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-logo-blue-light);
  box-shadow: 0 0 0 3px rgba(61, 81, 102, 0.35);
}

.form-group textarea {
  min-height: 140px;
  resize: vertical;
}

.form-select {
  width: 100%;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 400;
  padding: 0.75rem 1rem;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface-elevated);
  color: var(--color-text);
  cursor: pointer;
}

.form-select:focus {
  outline: none;
  border-color: var(--color-logo-blue-light);
  box-shadow: 0 0 0 3px rgba(61, 81, 102, 0.35);
}

.btn {
  display: inline-block;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 500;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--color-logo-blue);
  color: #fff;
  text-decoration: none;
  transition: opacity 0.2s ease;
}

.btn:hover {
  opacity: 0.9;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Footer */
.site-footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid var(--color-border);
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-muted);
  text-align: center;
}

.site-footer a {
  color: var(--color-text-muted);
  transition: color 0.22s ease;
}

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

/* Home hero (non-product fallback) */
.hero {
  text-align: center;
  padding: 3rem 0 3rem;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 200;
  margin-bottom: 0.75rem;
}

.hero .lead {
  max-width: 36em;
  margin-left: auto;
  margin-right: auto;
}

/* Support: FAQ */
.faq-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.faq-list li {
  margin-bottom: 0;
  border-bottom: 1px solid var(--color-border);
}

.faq-list li:last-child {
  border-bottom: none;
}

.faq-item {
  padding: 1.25rem 0;
}

.faq-item strong {
  display: block;
  font-weight: 500;
  margin-bottom: 0.4rem;
  color: var(--color-text);
}

.faq-item p {
  margin: 0;
  font-size: 0.944rem;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Privacy: sections */
.privacy-section {
  margin-bottom: 2.5rem;
}

.privacy-section h2 {
  margin-top: 2.5rem;
}

.privacy-section h2:first-child {
  margin-top: 0;
}

/* Last updated */
.muted {
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-text-tertiary);
}