/* ===== M3 Design Tokens — TheWeldin ===== */
:root {
  --primary: #f39322;
  --on-primary: #ffffff;
  --primary-container: #ffe9d0;
  --on-primary-container: #3a1f02;
  --secondary: #1f3340;
  --on-secondary: #ffffff;
  --secondary-container: #d9e4ec;
  --on-secondary-container: #152330;
  --tertiary-container: #d4e5e5;
  --on-tertiary-container: #1a3838;
  --surface: #fbf7f2;
  --on-surface: #26221c;
  --on-surface-variant: #595141;
  --surface-container-lowest: #ffffff;
  --surface-container-low: #f6f1ea;
  --surface-container: #f1ece3;
  --outline-variant: #d8d0be;

  --font: "Inter", system-ui, -apple-system, sans-serif;
  --sp-xs: 4px;
  --sp-sm: 8px;
  --sp-md: 12px;
  --sp-lg: 16px;
  --sp-xl: 20px;
  --sp-xxl: 24px;
  --sp-xxxl: 32px;
  --sp-hero: 40px;
  --sp-xhero: 80px;
  --radius-md: 12px;
  --radius-full: 999px;
  --ease-decelerate: cubic-bezier(0.05, 0.7, 0.1, 1);
  --dur-short: 200ms;
  --dur-medium: 300ms;
}

/* ===== Dark scheme ===== */
@media (prefers-color-scheme: dark) {
  :root {
    --primary: #e8b584;
    --on-primary: #3a1f02;
    --primary-container: #5c3818;
    --on-primary-container: #ffe9d0;
    --secondary: #a8bcc9;
    --on-secondary: #1f3340;
    --secondary-container: #2d4654;
    --on-secondary-container: #d4e4f0;
    --tertiary-container: #2e4d4d;
    --on-tertiary-container: #d4e5e5;
    --surface: #1f3340;
    --on-surface: #e2ded7;
    --on-surface-variant: #c2bba9;
    --surface-container-lowest: #15222b;
    --surface-container-low: #223846;
    --surface-container: #273e4c;
    --outline-variant: #504a3d;
  }
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  font-weight: 400;
  background-color: var(--surface);
  color: var(--on-surface);
  line-height: 1.5;
}

/* ===== Layout ===== */
.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 var(--sp-xl);
}

/* ===== Header ===== */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: 10;
  background-color: var(--surface);
  border-bottom: 1px solid var(--outline-variant);
  transform: translateY(-100%);
  transition: transform var(--dur-medium) var(--ease-decelerate);
}

.site-header.visible {
  transform: translateY(0);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo-img {
  display: inline-block;
  height: 3em;
}

.badge-soon {
  display: inline-flex;
  align-items: center;
  height: 32px;
  padding: 0 var(--sp-md);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  color: var(--on-primary-container);
  background-color: var(--primary-container);
  border-radius: var(--radius-full);
}

/* ===== Hero ===== */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  background-color: var(--secondary);
  color: var(--on-secondary);
  padding: var(--sp-hero) var(--sp-xl);
}

.hero-inner {
  max-width: 50vw;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.hero-logo {
  max-width: 80vh;
  margin-bottom: var(--sp-xhero);
}

.hero-title {
  font-size: clamp(20px, 3vw, 28px);
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: 0;
  margin-bottom: var(--sp-sm);
}

.hero-subtitle {
  font-size: 16px;
  line-height: 1.5;
  opacity: 0.88;
  margin-bottom: var(--sp-hero);
  max-width: 70vw;
}

/* ===== Buttons ===== */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  padding: 0 var(--sp-xxl);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  letter-spacing: 0.1px;
  color: var(--on-primary);
  background-color: var(--primary);
  border: none;
  border-radius: var(--radius-full);
  cursor: pointer;
  text-decoration: none;
  transition: opacity var(--dur-short) var(--ease-decelerate);
}

.btn-primary:hover {
  opacity: 0.88;
}

.btn-primary:active {
  opacity: 0.76;
}

/* ===== Section title ===== */
.section-title {
  font-size: 28px;
  font-weight: 400;
  line-height: 1.29;
  margin-bottom: var(--sp-xxxl);
  color: var(--on-surface);
}

.offers-title {
  display: flex;
  flex-direction: row;
  gap: 0.5em;
  align-items: end;
}

.offers-title img {
  height: 2em;
}

.offers-title p {
  line-height: 0.8;
}

/* ===== Features ===== */
.features {
  padding: var(--sp-xhero) 0;
  background-color: var(--surface-container-low);
}

.features-grid {
  display: grid;
  gap: var(--sp-xxl);
}

.feature-item {
  display: flex;
  flex-direction: column;
  gap: var(--sp-md);
  padding: var(--sp-xxl);
  background-color: var(--surface-container-lowest);
  border: 1px solid var(--outline-variant);
  border-radius: var(--radius-md);
}

.feature-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: var(--radius-md);
  background-color: var(--primary-container);
  color: var(--on-primary-container);
  line-height: 1;
}

.feature-title {
  font-size: 22px;
  font-weight: 400;
  line-height: 1.27;
  color: var(--on-surface);
}

.feature-desc {
  font-size: 14px;
  line-height: 1.43;
  color: var(--on-surface-variant);
}

/* ===== Timeline ===== */
.timeline-section {
  padding: var(--sp-xhero) 0;
  background-color: var(--surface);
}

.timeline {
  display: grid;
  grid-template-columns: 10% 1fr;
  gap: var(--sp-sm) var(--sp-lg);
}

.timeline-time {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-sm);
  color: var(--on-tertiary-container);
}

.timeline-time .mdi {
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: var(--tertiary-container);
  font-size: 20px;
}

.timeline-time hr {
  width: 2px;
  min-height: 2em;
  height: 100%;
  border: 0;
  background-color: var(--outline-variant);
}

.timeline-content h3 {
  font-size: 22px;
  font-weight: 400;
  line-height: 1.27;
  color: var(--on-surface);
  margin-bottom: var(--sp-sm);
}

.timeline-content p {
  font-size: 14px;
  line-height: 1.43;
  color: var(--on-surface-variant);
}

/* ===== Footer ===== */
.site-footer {
  padding: var(--sp-xxxl) 0;
  background-color: var(--surface-container);
  border-top: 1px solid var(--outline-variant);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-lg);
  text-align: center;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--sp-xs);
}

.footer-tagline {
  font-size: 12px;
  color: var(--on-surface-variant);
}

.footer-copy {
  font-size: 12px;
  color: var(--on-surface-variant);
  opacity: 0.7;
}

/* ===== Scroll animations ===== */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition:
    opacity var(--dur-medium) var(--ease-decelerate),
    transform var(--dur-medium) var(--ease-decelerate);
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== Responsive — Medium (≥600px) ===== */
@media (min-width: 600px) {
  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .hero {
    padding: 80px var(--sp-xl);
  }

  .timeline {
    grid-template-columns: 56px 1fr;
  }

  .timeline-time .mdi {
    width: 44px;
    height: 44px;
  }
}

/* ===== Responsive — Expanded (≥840px) ===== */
@media (min-width: 840px) {
  .hero-title {
    font-size: 32px;
  }

  .section-title {
    font-size: 32px;
  }

  .features-grid {
    gap: var(--sp-xxxl);
  }

  .feature-item {
    padding: var(--sp-xxxl);
  }
}