/* ==========================================================================
   Cardsemble — Website Styles
   Public-facing landing page stylesheet.
   Brand colors mirror mobile_app/lib/theme/app_colors.dart (primary, cream,
   charcoal) for visual consistency.
   ========================================================================== */

:root {
  --csm-primary: #244a3a;
  --csm-primary-dark: #173f35;
  --csm-cream: #f3efe6;
  --csm-sand: #d8cdbb;
  --csm-charcoal: #292d29;
  --csm-surface: #ffffff;
  --csm-background: #f3efe6;
  --csm-ink: #292d29;
  --csm-ink-soft: #5c625c;
  --csm-line: #e4dcd0;
  --csm-error: #b00020;

  --font-sans: "Inter", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont,
    "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SFMono-Regular", "Roboto Mono", Consolas, "Liberation Mono",
    monospace;

  --container-width: 1120px;
  --radius: 14px;
  --radius-sm: 10px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 84px;
}

body {
  margin: 0;
  background: var(--csm-background);
  color: var(--csm-ink);
  font-family: var(--font-sans);
  font-size: 17px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
h4 {
  color: var(--csm-charcoal);
  line-height: 1.18;
  font-weight: 700;
  letter-spacing: -0.015em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.4rem, 6vw, 3.9rem);
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(1.9rem, 4vw, 2.7rem);
  letter-spacing: -0.025em;
}

h3 {
  font-size: 1.35rem;
}

p {
  margin: 0 0 1em;
}

a {
  color: var(--csm-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

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

button {
  font-family: inherit;
}

:focus-visible {
  outline: 3px solid rgba(36, 74, 58, 0.45);
  outline-offset: 2px;
  border-radius: 4px;
}

.container {
  width: min(var(--container-width), calc(100% - 3rem));
  margin-inline: auto;
}

.section {
  padding: clamp(4.5rem, 9vw, 7.5rem) 0;
}

.section--tight {
  padding: clamp(3rem, 6vw, 4.5rem) 0;
}

.section--alt {
  background: var(--csm-surface);
  border-block: 1px solid var(--csm-line);
}

.section-header {
  max-width: 640px;
  margin-bottom: clamp(2.25rem, 5vw, 3.5rem);
}

.section-header--center {
  margin-inline: auto;
  text-align: center;
}

.section-header p {
  color: var(--csm-ink-soft);
  font-size: 1.06rem;
  margin-bottom: 0;
}

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--csm-primary);
  margin-bottom: 0.9rem;
}

.lede {
  font-size: clamp(1.12rem, 2.2vw, 1.32rem);
  color: var(--csm-ink-soft);
  line-height: 1.6;
  margin-bottom: 0;
}

/* ---------- Header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 239, 230, 0.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  border-bottom-color: var(--csm-line);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  height: 68px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--csm-charcoal);
  letter-spacing: -0.02em;
}

.brand:hover {
  text-decoration: none;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 9px;
  background: var(--csm-primary);
  color: #ffffff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  flex: none;
}

.brand-name {
  font-size: 1.15rem;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
}

.site-nav a {
  color: var(--csm-ink);
  font-weight: 500;
  font-size: 0.97rem;
}

.site-nav a:hover {
  color: var(--csm-primary);
  text-decoration: none;
}

.site-nav a[aria-current="page"] {
  color: var(--csm-primary);
}

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--csm-primary);
  color: #ffffff !important;
  font-weight: 600;
  font-size: 0.95rem;
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
}

.nav-cta:hover {
  background: var(--csm-primary-dark);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  border: 1px solid var(--csm-line);
  border-radius: var(--radius-sm);
  padding: 0.5rem;
  color: var(--csm-charcoal);
  cursor: pointer;
}

.mobile-nav {
  display: none;
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-weight: 600;
  font-size: 1.02rem;
  padding: 0.9rem 1.6rem;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease,
    transform 0.15s ease;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn--primary {
  background: var(--csm-primary);
  color: #ffffff;
}

.btn--primary:hover {
  background: var(--csm-primary-dark);
}

.btn--ghost {
  background: transparent;
  color: var(--csm-primary);
  border-color: var(--csm-primary);
}

.btn--ghost:hover {
  background: rgba(36, 74, 58, 0.06);
}

.btn--light {
  background: #ffffff;
  color: var(--csm-charcoal);
}

.btn--lg {
  padding: 1.05rem 1.9rem;
  font-size: 1.1rem;
}

.btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ---------- Hero ---------- */

.hero {
  padding: clamp(4rem, 9vw, 7rem) 0 clamp(3.5rem, 7vw, 5.5rem);
  background: var(--csm-background);
}

.hero .container {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}

.hero h1 .accent {
  color: var(--csm-primary);
}

.hero .lede {
  max-width: 34rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.9rem;
  margin-top: 1.75rem;
}

.hero-meta {
  margin-top: 2.25rem;
  color: var(--csm-ink-soft);
  font-size: 0.95rem;
}

.hero-meta a {
  color: var(--csm-primary);
  font-weight: 600;
}

/* Hero visual: device mockup built from plain CSS */

.hero-visual {
  position: relative;
}

.mockup {
  background: var(--csm-charcoal);
  border-radius: 26px;
  padding: clamp(1.1rem, 2.6vw, 1.8rem);
  box-shadow: 0 30px 60px -30px rgba(23, 63, 53, 0.45);
  color: #f3efe6;
}

.mockup-bar {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin-bottom: 1.1rem;
}

.mockup-bar span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--csm-sand);
  opacity: 0.85;
}

.mockup-bar span:nth-child(2) {
  opacity: 0.55;
}

.mockup-bar span:nth-child(3) {
  opacity: 0.3;
}

.mockup-title {
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(243, 239, 230, 0.6);
  margin-bottom: 1rem;
}

.mockup-body {
  display: grid;
  gap: 0.9rem;
}

.mockup-total {
  background: rgba(243, 239, 230, 0.07);
  border: 1px solid rgba(243, 239, 230, 0.14);
  border-radius: var(--radius);
  padding: 0.9rem 1.1rem;
}

.mockup-total .mockup-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(243, 239, 230, 0.6);
}

.mockup-total .mockup-value {
  font-size: 1.7rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.mockup-card {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  background: rgba(36, 74, 58, 0.35);
  border: 1px solid rgba(36, 74, 58, 0.55);
  border-radius: var(--radius);
  padding: 0.85rem 1rem;
}

.mockup-card .mockup-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(243, 239, 230, 0.6);
}

.mockup-card .mockup-value {
  font-weight: 600;
  font-size: 1.05rem;
}

.mockup-row {
  display: grid;
  gap: 0.45rem;
}

.mockup-row .mockup-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: rgba(243, 239, 230, 0.6);
}

.mockup-chip-row {
  display: flex;
  gap: 0.5rem;
}

.mockup-chip {
  background: rgba(243, 239, 230, 0.1);
  border: 1px solid rgba(243, 239, 230, 0.16);
  color: #f3efe6;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
}

.mockup-foot {
  margin-top: 1.1rem;
  font-size: 0.78rem;
  color: rgba(243, 239, 230, 0.55);
}

/* Floating status badge over the mockup */

.mockup-badge {
  position: absolute;
  top: -18px;
  right: -14px;
  background: #ffffff;
  color: var(--csm-charcoal);
  border: 1px solid var(--csm-line);
  border-radius: 999px;
  padding: 0.45rem 0.9rem;
  font-size: 0.8rem;
  font-weight: 600;
  box-shadow: 0 14px 30px -18px rgba(23, 63, 53, 0.5);
}

/* ---------- Feature grid ---------- */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.feature-card {
  background: var(--csm-surface);
  border: 1px solid var(--csm-line);
  border-radius: var(--radius);
  padding: 1.6rem;
}

.feature-card .feature-icon {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: rgba(36, 74, 58, 0.1);
  color: var(--csm-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.1rem;
}

.feature-card h3 {
  margin-bottom: 0.35rem;
}

.feature-card p {
  color: var(--csm-ink-soft);
  margin-bottom: 0;
  font-size: 0.98rem;
}

/* ---------- How it works ---------- */

.steps {
  display: grid;
  gap: 0;
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 1.25rem;
  padding: 1.9rem 0;
  border-bottom: 1px solid var(--csm-line);
}

.step:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.step:first-child {
  padding-top: 0;
}

.step-num {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--csm-primary);
  color: #ffffff;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

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

.step p {
  color: var(--csm-ink-soft);
  margin-bottom: 0;
}

/* ---------- CTA band ---------- */

.cta-band {
  background: var(--csm-primary);
  color: #f3efe6;
  border-radius: calc(var(--radius) + 8px);
  padding: clamp(2.5rem, 6vw, 4rem);
  text-align: center;
}

.cta-band h2 {
  color: #ffffff;
  margin-bottom: 0.4em;
}

.cta-band p {
  color: rgba(243, 239, 230, 0.82);
  max-width: 40rem;
  margin-inline: auto;
}

.cta-band .btn {
  margin-top: 0.9rem;
}

.cta-band .btn--light {
  background: #ffffff;
  color: var(--csm-primary-dark);
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--csm-charcoal);
  color: rgba(243, 239, 230, 0.75);
  padding: clamp(3rem, 6vw, 4.5rem) 0 2rem;
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 2rem;
}

.site-footer h2,
.site-footer h3 {
  color: #ffffff;
  font-size: 1rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.6rem;
}

.site-footer a {
  color: rgba(243, 239, 230, 0.75);
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer .footer-bottom {
  margin-top: 2.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(243, 239, 230, 0.14);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.88rem;
  color: rgba(243, 239, 230, 0.5);
}

/* ---------- Legal / support page shells ---------- */

.prose {
  max-width: 48rem;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

.prose h1 {
  margin-bottom: 0.35em;
}

.prose .updated {
  color: var(--csm-ink-soft);
  font-size: 0.9rem;
  margin-bottom: 2rem;
}

.prose h2 {
  font-size: 1.6rem;
  margin-top: 2.5rem;
}

.prose h3 {
  font-size: 1.2rem;
  margin-top: 2rem;
}

.prose p,
.prose li {
  color: #3a3f3a;
}

.prose ul {
  padding-left: 1.4rem;
}

.prose li {
  margin-bottom: 0.4rem;
}

.prose .placeholder {
  display: block;
  background: #faf6ec;
  border: 1px dashed var(--csm-sand);
  border-radius: var(--radius-sm);
  padding: 0.85rem 1rem;
  margin: 0.5rem 0 1rem;
  font-family: var(--font-mono);
  font-size: 0.88rem;
  color: var(--csm-ink-soft);
}

.prose .placeholder strong {
  display: block;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--csm-primary);
  margin-bottom: 0.25rem;
}

.notice {
  background: #faf6ec;
  border: 1px solid var(--csm-sand);
  border-left: 4px solid var(--csm-primary);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.25rem;
  margin: 1.75rem 0;
  color: var(--csm-ink-soft);
}

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

/* ---------- Support ---------- */

.support-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.25rem;
  margin-top: 2.25rem;
}

.support-topic {
  background: var(--csm-surface);
  border: 1px solid var(--csm-line);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.support-topic h3 {
  margin-bottom: 0.35rem;
}

.support-topic p {
  color: var(--csm-ink-soft);
  margin-bottom: 0;
}

/* ---------- Responsive ---------- */

@media (max-width: 900px) {
  .hero .container {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    max-width: 520px;
  }

  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .support-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  body {
    font-size: 16px;
  }

  .site-nav {
    display: none;
  }

  .menu-toggle {
    display: inline-flex;
  }

  .mobile-nav {
    display: block;
    position: absolute;
    top: 68px;
    left: 0;
    right: 0;
    background: var(--csm-background);
    border-bottom: 1px solid var(--csm-line);
    padding: 0.75rem 1.5rem 1.5rem;
  }

  .mobile-nav a {
    display: block;
    padding: 0.7rem 0;
    font-size: 1.05rem;
  }

  .mobile-nav .nav-cta {
    margin-top: 0.75rem;
    justify-content: center;
  }

  .feature-grid {
    grid-template-columns: 1fr;
  }

  .step {
    grid-template-columns: 48px 1fr;
    gap: 1rem;
  }

  .site-footer .container {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  * {
    transition: none !important;
  }
}