/* css/style.css — Foleks Apps Studio Design System */

/* ── Google Fonts ──────────────────────────────────────────────────────────── */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
@import url('https://fonts.googleapis.com/css2?family=Material+Symbols+Outlined:opsz,wght,FILL,GRAD@24,400,0,0&display=swap');

/* ── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  /* Surface */
  --surface:                   #fcf8f9;
  --surface-dim:               #dcd9da;
  --surface-bright:            #fcf8f9;
  --surface-container-lowest:  #ffffff;
  --surface-container-low:     #f6f3f4;
  --surface-container:         #f0edee;
  --surface-container-high:    #eae7e8;
  --surface-container-highest: #e4e2e3;
  --on-surface:                #1b1b1c;
  --on-surface-variant:        #45474c;
  --inverse-surface:           #303031;
  --inverse-on-surface:        #f3f0f1;
  --outline:                   #75777c;
  --outline-variant:           #c5c6cc;
  --surface-tint:              #575f6d;
  --background:                #fcf8f9;
  --on-background:             #1b1b1c;
  --surface-variant:           #e4e2e3;

  /* Primary (navy/black) */
  --primary:               #000000;
  --on-primary:            #ffffff;
  --primary-container:     #141c28;
  --on-primary-container:  #7c8493;
  --inverse-primary:       #bfc7d7;
  --primary-fixed:         #dbe3f4;
  --primary-fixed-dim:     #bfc7d7;
  --on-primary-fixed:      #141c28;
  --on-primary-fixed-variant: #3f4755;

  /* Secondary (green — Simple Smart Alarm) */
  --secondary:             #006d37;
  --on-secondary:          #ffffff;
  --secondary-container:   #7bf8a1;
  --on-secondary-container:#007239;
  --secondary-fixed:       #7efba4;
  --secondary-fixed-dim:   #61de8a;
  --on-secondary-fixed:    #00210c;
  --on-secondary-fixed-variant: #005228;

  /* Tertiary (blue — Domain Expire Checker) */
  --tertiary:              #000000;
  --on-tertiary:           #ffffff;
  --tertiary-container:    #001d31;
  --on-tertiary-container: #1d8acd;
  --tertiary-fixed:        #cce5ff;
  --tertiary-fixed-dim:    #92ccff;
  --on-tertiary-fixed:     #001d31;
  --on-tertiary-fixed-variant: #004b73;

  /* Error */
  --error:             #ba1a1a;
  --on-error:          #ffffff;
  --error-container:   #ffdad6;
  --on-error-container:#93000a;

  /* Typography */
  --font-sans: 'Inter', system-ui, sans-serif;
  --font-mono: 'Courier New', monospace;

  /* Spacing */
  --section-padding: 80px;
  --container-width: 1200px;
  --gutter: 24px;
  --margin-mobile: 16px;
  --element-gap: 16px;

  /* Radius */
  --radius-sm:   4px;
  --radius-md:   8px;
  --radius-lg:   16px;
  --radius-xl:   24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
  --shadow-card: 0 2px 8px rgba(0,0,0,0.04);

  /* Transition */
  --transition: 200ms ease;
}

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

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-sans);
  background: var(--background);
  color: var(--on-background);
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main { flex: 1; }

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; }

ul { list-style: none; }

/* ── Typography ────────────────────────────────────────────────────────────── */
.display-lg {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.headline-lg {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
.headline-md {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.35;
}
.body-lg {
  font-size: 1.125rem;
  font-weight: 400;
  line-height: 1.6;
}
.body-md {
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.5;
}
.label-md {
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  letter-spacing: 0.05em;
}
code, .code-sm {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.4;
}

/* ── Container ─────────────────────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--margin-mobile);
}
@media (min-width: 768px) {
  .container { padding: 0 var(--gutter); }
}

/* ── Navigation ────────────────────────────────────────────────────────────── */
.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(252,248,249,0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.site-nav.scrolled {
  border-color: var(--outline-variant);
  box-shadow: var(--shadow-sm);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}
.nav-brand {
  font-size: 1.375rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.01em;
}
.nav-brand span { color: var(--secondary); }

.nav-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Back link */
.nav-back {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface-variant);
  padding: 6px 12px;
  border-radius: var(--radius-md);
  transition: background var(--transition), color var(--transition);
}
.nav-back:hover {
  background: var(--surface-container);
  color: var(--on-surface);
}
.nav-back .material-symbols-outlined { font-size: 18px; }

/* ── Language Switcher ─────────────────────────────────────────────────────── */
#lang-switcher {
  position: relative;
}
.lang-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  background: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface);
  cursor: pointer;
  transition: background var(--transition), box-shadow var(--transition);
  white-space: nowrap;
}
.lang-btn:hover { background: var(--surface-container); }
.lang-globe { font-size: 1rem; }
.lang-arrow { font-size: 0.75rem; transition: transform var(--transition); }
.lang-dropdown.open + .lang-btn .lang-arrow,
.lang-btn[aria-expanded="true"] .lang-arrow { transform: rotate(180deg); }

.lang-dropdown {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  right: 0;
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  min-width: 160px;
  overflow: hidden;
  z-index: 200;
}
.lang-dropdown.open { display: block; }
.lang-dropdown li {
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--on-surface);
  cursor: pointer;
  transition: background var(--transition);
}
.lang-dropdown li:hover { background: var(--surface-container-low); }
.lang-dropdown li.active {
  color: var(--secondary);
  background: rgba(0,109,55,0.06);
}

/* ── Buttons ───────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border: none;
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  cursor: pointer;
  transition: box-shadow var(--transition), opacity var(--transition), transform var(--transition);
  white-space: nowrap;
}
.btn:hover { box-shadow: var(--shadow-md); }
.btn:active { transform: scale(0.98); }

.btn-primary {
  background: var(--primary);
  color: var(--on-primary);
}
.btn-primary:hover { opacity: 0.88; }

.btn-secondary-green {
  background: var(--secondary);
  color: var(--on-secondary);
}
.btn-secondary-green:hover { opacity: 0.88; }

.btn-tertiary-blue {
  background: var(--tertiary-container);
  color: var(--on-tertiary);
}
.btn-tertiary-blue:hover { opacity: 0.88; }

.btn-outline {
  background: transparent;
  border: 1px solid var(--outline);
  color: var(--on-surface);
}
.btn-outline:hover { background: var(--surface-container-low); }

.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
  box-shadow: none;
}

/* ── App Badge ─────────────────────────────────────────────────────────────── */
.app-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: var(--radius-full);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.app-badge-green {
  background: rgba(0,109,55,0.1);
  color: var(--secondary);
  border: 1px solid rgba(0,109,55,0.25);
}
.app-badge-blue {
  background: var(--tertiary-fixed);
  color: var(--on-tertiary-fixed-variant);
  border: 1px solid rgba(29,138,205,0.2);
}
.app-badge .material-symbols-outlined { font-size: 16px; }

/* ── Feature Cards ─────────────────────────────────────────────────────────── */
.feature-card {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition), transform var(--transition);
  position: relative;
  overflow: hidden;
}
.feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}
.feature-card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.feature-card-icon-green {
  background: rgba(0,109,55,0.12);
  color: var(--secondary);
}
.feature-card-icon-blue {
  background: var(--tertiary-fixed);
  color: var(--on-tertiary-fixed-variant);
}
.feature-card-icon .material-symbols-outlined { font-size: 22px; }
.feature-card h3 { font-size: 1.125rem; font-weight: 600; color: var(--on-surface); }
.feature-card p  { font-size: 1rem; color: var(--on-surface-variant); line-height: 1.55; }

/* ── Changelog ─────────────────────────────────────────────────────────────── */
.changelog-card {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  padding: 24px 28px;
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition);
}
.changelog-card:hover { box-shadow: var(--shadow-sm); }

.changelog-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--outline-variant);
  margin-bottom: 16px;
  flex-wrap: wrap;
  gap: 8px;
}
.changelog-version-info {
  display: flex;
  align-items: center;
  gap: 12px;
}
.version-badge {
  background: var(--primary-container);
  color: var(--primary-fixed-dim);
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.875rem;
  font-weight: 600;
  letter-spacing: 0.03em;
}
.changelog-dec .version-badge {
  background: var(--tertiary-container);
  color: var(--tertiary-fixed-dim);
}
.changelog-ssa .version-badge {
  background: var(--secondary);
  color: var(--on-secondary);
}
.version-date {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
}
.changelog-items { display: flex; flex-direction: column; gap: 12px; }
.changelog-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
}
.changelog-tag {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  flex-shrink: 0;
  text-transform: uppercase;
  margin-top: 2px;
}
.tag-new      { background: rgba(0,109,55,0.1);  color: var(--secondary); border: 1px solid rgba(0,109,55,0.2); }
.tag-fix      { background: rgba(186,26,26,0.08); color: var(--error);     border: 1px solid rgba(186,26,26,0.2); }
.tag-improved { background: var(--tertiary-fixed); color: var(--on-tertiary-fixed-variant); border: 1px solid rgba(29,138,205,0.2); }
.tag-removed  { background: var(--surface-container-high); color: var(--on-surface-variant); border: 1px solid var(--outline-variant); }

.changelog-item-text { font-size: 0.9375rem; color: var(--on-surface); line-height: 1.55; }

/* ── Section headers ───────────────────────────────────────────────────────── */
.section-header {
  text-align: center;
  margin-bottom: 56px;
}
.section-header h2 { color: var(--on-background); margin-bottom: 12px; }
.section-header p  { color: var(--on-surface-variant); max-width: 600px; margin: 0 auto; }

/* ── Hero ──────────────────────────────────────────────────────────────────── */
.hero {
  padding: var(--section-padding) 0;
}
.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 24px;
}
.hero h1 { max-width: 700px; }
.hero-subtitle { max-width: 580px; color: var(--on-surface-variant); }
@media (min-width: 768px) {
  .hero { padding: calc(var(--section-padding) * 1.5) 0; }
}

/* ── App Section (Home) ────────────────────────────────────────────────────── */
.app-section {
  padding: var(--section-padding) 0;
}
.app-section-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 48px;
}
.app-section-text { display: flex; flex-direction: column; gap: 20px; }
.app-section-text h2 { color: var(--on-background); }
.app-section-text p  { color: var(--on-surface-variant); }
.app-section-image { width: 100%; max-width: 400px; }
.app-section-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 3px solid rgba(255,255,255,0.8);
  width: 100%;
}
.image-glow {
  position: relative;
}
.image-glow::before {
  content: '';
  position: absolute;
  inset: -10px;
  border-radius: var(--radius-xl);
  opacity: 0.25;
  filter: blur(28px);
  z-index: 0;
}
.image-glow-green::before { background: var(--secondary); }
.image-glow-blue::before  { background: var(--on-tertiary-container); }
.image-glow img { position: relative; z-index: 1; }

@media (min-width: 768px) {
  .app-section-inner {
    flex-direction: row;
    gap: 64px;
  }
  .app-section-inner.reverse { flex-direction: row-reverse; }
  .app-section-text { flex: 1; }
  .app-section-image { flex: 0 0 auto; width: 340px; }
}

.app-section-bg-low { background: var(--surface-container-low); }

/* ── Features Grid ─────────────────────────────────────────────────────────── */
.features-section {
  padding: var(--section-padding) 0;
  background: var(--surface-container-lowest);
  border-top: 1px solid var(--outline-variant);
  border-bottom: 1px solid var(--outline-variant);
}
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 640px) {
  .features-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 960px) {
  .features-grid { grid-template-columns: repeat(3, 1fr); }
  .features-grid .col-span-2 { grid-column: span 2; }
}

/* ── Detail Hero ───────────────────────────────────────────────────────────── */
.detail-hero {
  padding: var(--section-padding) 0;
}
.detail-hero-inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
  align-items: center;
}
.detail-hero-text { display: flex; flex-direction: column; gap: 24px; }
.detail-hero-text h1 { color: var(--on-background); }
.detail-hero-text p  { color: var(--on-surface-variant); max-width: 520px; }
.detail-hero-cta { display: flex; flex-wrap: wrap; gap: 12px; }
.detail-hero-image { width: 100%; max-width: 320px; }
.detail-hero-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--outline-variant);
  width: 100%;
  transition: transform 500ms ease;
}
.detail-hero-image img:hover { transform: rotate(0deg) scale(1.01); }
@media (min-width: 768px) {
  .detail-hero-inner {
    flex-direction: row;
    gap: 64px;
  }
  .detail-hero-text { flex: 1; }
  .detail-hero-image { flex: 0 0 280px; }
}

/* ── Control Section (DEC) ─────────────────────────────────────────────────── */
.control-section { padding: var(--section-padding) 0; }
.control-inner {
  display: flex;
  flex-direction: column;
  gap: 48px;
  align-items: center;
}
.control-text { display: flex; flex-direction: column; gap: 20px; }
.control-text h2 { color: var(--on-background); }
.control-text p  { color: var(--on-surface-variant); }
.control-list { display: flex; flex-direction: column; gap: 12px; margin-top: 8px; }
.control-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 1rem;
  color: var(--on-surface);
}
.control-list li .material-symbols-outlined {
  font-size: 20px;
  color: var(--on-tertiary-container);
  margin-top: 2px;
  flex-shrink: 0;
}
@media (min-width: 768px) {
  .control-inner { flex-direction: row-reverse; gap: 64px; }
  .control-text { flex: 1; }
  .control-image { flex: 0 0 280px; }
}
.control-image img {
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  border: 2px solid var(--outline-variant);
  width: 100%;
  max-width: 280px;
}

/* ── Changelog Section ─────────────────────────────────────────────────────── */
.changelog-section {
  padding: var(--section-padding) 0;
  background: var(--surface);
  border-top: 1px solid var(--outline-variant);
}
.changelog-section-inner { max-width: 760px; margin: 0 auto; }
.changelog-section h2 {
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 600;
  color: var(--on-background);
  margin-bottom: 8px;
}
.changelog-section .subtitle {
  color: var(--on-surface-variant);
  margin-bottom: 40px;
}
.changelog-list { display: flex; flex-direction: column; gap: 20px; }

/* ── Footer ────────────────────────────────────────────────────────────────── */
.site-footer {
  background: var(--surface-container-low);
  border-top: 1px solid var(--outline-variant);
  padding: 48px 0;
}
.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
  align-items: flex-start;
}
.footer-brand {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: -0.01em;
}
.footer-tagline {
  color: var(--on-surface-variant);
  font-size: 0.9375rem;
  margin-top: 4px;
}
.footer-contact {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--on-surface-variant);
  font-size: 0.9375rem;
  margin-top: 8px;
}
.footer-contact a {
  color: var(--on-surface-variant);
  transition: color var(--transition);
}
.footer-contact a:hover { color: var(--primary); }
.footer-contact .material-symbols-outlined { font-size: 18px; }
.footer-copyright {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  margin-top: 8px;
  opacity: 0.75;
}
.footer-right {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: flex-start;
}
.footer-links {
  display: flex;
  gap: 16px;
}
.footer-links a {
  color: var(--on-surface-variant);
  font-size: 0.875rem;
  text-decoration: underline;
  transition: color var(--transition);
}
.footer-links a:hover {
  color: var(--primary);
}
@media (min-width: 768px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
  .footer-right {
    align-items: flex-end;
  }
}

/* ── FAQ Section ──────────────────────────────────────────────────────────── */
.faq-section {
  padding: var(--section-padding) 0;
  background: var(--surface-container-low);
}
.faq-list {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.faq-item {
  background: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: box-shadow var(--transition);
}
.faq-item:hover {
  box-shadow: var(--shadow-sm);
}
.faq-question {
  padding: 20px 24px;
  font-size: 1rem;
  font-weight: 600;
  color: var(--on-surface);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  list-style: none;
  user-select: none;
}
.faq-question::-webkit-details-marker {
  display: none;
}
.faq-question::after {
  content: '▾';
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  transition: transform var(--transition);
  flex-shrink: 0;
}
.faq-item[open] .faq-question::after {
  transform: rotate(180deg);
}
.faq-answer {
  padding: 0 24px 20px;
  font-size: 0.9375rem;
  color: var(--on-surface-variant);
  line-height: 1.6;
}

/* ── Fade-in animation ─────────────────────────────────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms ease, transform 500ms ease;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Utility ───────────────────────────────────────────────────────────────── */
.text-secondary { color: var(--secondary); }
.text-blue      { color: var(--on-tertiary-container); }
.mt-4  { margin-top: 16px; }
.mt-8  { margin-top: 32px; }
.mt-12 { margin-top: 48px; }
.sr-only {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

/* ── Responsive helpers ────────────────────────────────────────────────────── */
@media (max-width: 767px) {
  :root { --section-padding: 48px; }
  .headline-md { font-size: 1.25rem; }
  .feature-card { padding: 24px; }
  .changelog-card { padding: 20px; }
}

/* ── DEC demo widget ───────────────────────────────────────────────────────── */
.dec-demo {
  margin-top: 16px;
  background: var(--surface-container-low);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
  overflow: hidden;
  max-width: 400px;
}
.dec-demo-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 16px;
  font-size: 0.875rem;
  font-weight: 500;
  border-bottom: 1px solid var(--outline-variant);
}
.dec-demo-row:last-child { border-bottom: none; }
.dec-demo-domain { flex: 1; color: var(--on-surface); }
.dec-demo-days { font-size: 0.8125rem; }
.dec-icon-ok    { color: var(--secondary); font-size: 20px; }
.dec-icon-avail { color: var(--on-surface-variant); font-size: 20px; }