/* ============================================================
   DESIGN SYSTEM — Starbucks-inspired (DESIGN.md)
   Warm cream canvas · four-tier green brand system ·
   tight -0.01em tracking · 12px cards · 50px full-pill buttons
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Surfaces */
  --canvas-soft: #f2f0eb;   /* Neutral Warm — page canvas */
  --canvas: #ffffff;        /* white — nav + utility surfaces */
  --surface: #ffffff;       /* white — cards & modals */
  --hairline: #e7e7e7;      /* neutral hairline */
  --field-border: #d6dbde;  /* input border */

  /* Text (warm black ladder — never pure black) */
  --ink: rgba(0, 0, 0, 0.87);
  --ink-secondary: rgba(0, 0, 0, 0.58);
  --ink-muted: rgba(0, 0, 0, 0.58);
  --ink-faint: rgba(0, 0, 0, 0.38);

  /* Brand — Starbucks four-tier green system */
  --primary: #00754a;        /* Green Accent — CTA fill / Frap */
  --primary-active: #006241; /* Starbucks Green — pressed / headings */
  --secondary: #1e3932;      /* House Green — bands, footer */
  --green-uplift: #2b5148;   /* decorative mid-dark green */
  --green-light: #d4e9e2;    /* pale mint wash / valid tints */
  --gold: #cba258;           /* rewards ceremony only */
  --gold-light: #dfc49d;
  --gold-lightest: #faf6ee;
  --on-primary: #ffffff;

  /* Semantic */
  --danger: #c82014;
  --warning: #fbbc05;

  /* Decorative sticker palette — warm café tints, never structure */
  --accent-sky: #9fc9c0;
  --accent-purple: #cbb9a9;
  --accent-purple-deep: #4a3f33;
  --accent-pink: #e7c0b5;
  --accent-orange: #d9a05b;
  --accent-orange-deep: #8a5a1c;
  --accent-teal: #6bb8a0;
  --accent-green: #1e8e5a;
  --accent-brown: #6b4f35;

  /* Typography — Be Vietnam Pro (tiếng Việt) + Inter fallback */
  --font-sans: "Be Vietnam Pro", "Inter", -apple-system, system-ui, "Segoe UI", Helvetica, Arial, sans-serif;

  /* Rounded — 12px cards, 50px pills */
  --radius-xs: 4px;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 50px;

  /* Spacing (base 8px) */
  --space-xxs: 4px;
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 28px;
  --space-xxl: 32px;

  /* Elevation — whisper-soft, layered (never one heavy shadow) */
  --shadow-soft:
    0 0 0.5px rgba(0, 0, 0, 0.14),
    0 1px 1px rgba(0, 0, 0, 0.24);
  --shadow-elevated:
    0 1px 3px rgba(0, 0, 0, 0.10),
    0 2px 2px rgba(0, 0, 0, 0.06),
    0 0 2px rgba(0, 0, 0, 0.07);
  --shadow-frap:
    0 0 6px rgba(0, 0, 0, 0.24),
    0 8px 12px rgba(0, 0, 0, 0.14);
}

/* ---------- Base ---------- */
html {
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background-color: var(--canvas-soft);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: "lnum", "locl";
  letter-spacing: -0.01em;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  color: var(--ink);
  font-feature-settings: "lnum", "locl";
}

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

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

::selection {
  background: var(--primary);
  color: var(--on-primary);
}

/* ---------- Typography utilities ---------- */
.display-1 {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.0;
  letter-spacing: -2.125px;
}

.display-2 {
  font-size: 54px;
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -1.875px;
}

.heading-1 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
}

.heading-2 {
  font-size: 26px;
  font-weight: 700;
  line-height: 1.23;
  letter-spacing: -0.625px;
}

.heading-3 {
  font-size: 22px;
  font-weight: 700;
  line-height: 1.27;
  letter-spacing: -0.25px;
}

.type-title {
  font-size: 20px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: -0.125px;
}

.body-md {
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;
}

.body-sm {
  font-size: 15px;
  font-weight: 400;
  line-height: 1.33;
}

.eyebrow {
  font-size: 12px;
  font-weight: 600;
  line-height: 1.33;
  letter-spacing: 0.125px;
  text-transform: uppercase;
}

.caption {
  font-size: 14px;
  font-weight: 400;
  line-height: 1.43;
}

@media (max-width: 600px) {
  .display-1 { font-size: 44px; letter-spacing: -1.5px; }
  .display-2 { font-size: 38px; letter-spacing: -1.25px; }
  .heading-1 { font-size: 32px; letter-spacing: -0.75px; }
}

/* ---------- Buttons ---------- */
.btn, .button-primary, .button-secondary, .button-utility {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 16px;
  font-weight: 500;
  line-height: 1.5;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: background-color 0.15s ease, color 0.15s ease, box-shadow 0.15s ease, transform 0.1s ease;
  min-height: 44px;
}

.button-primary {
  background-color: var(--primary);
  color: var(--on-primary);
  border-radius: var(--radius-full);
  padding: 10px 24px;
}

.button-primary:hover {
  background-color: var(--primary-active);
  color: var(--on-primary);
}

.button-primary:active {
  background-color: var(--primary-active);
  transform: scale(0.95);
}

.button-secondary {
  background-color: var(--surface);
  color: var(--ink);
  border-radius: var(--radius-full);
  padding: 10px 24px;
  box-shadow: var(--shadow-soft);
}

.button-secondary:hover {
  color: var(--ink);
  box-shadow: var(--shadow-elevated);
}

.button-utility {
  background-color: var(--surface);
  color: var(--ink);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-md);
  padding: 4px 14px;
  min-height: 36px;
  font-size: 15px;
}

.button-utility:hover {
  color: var(--ink);
  border-color: var(--ink-faint);
  background-color: #ffffff;
}

.button-primary.btn, .button-primary.btn:hover {
  color: var(--on-primary);
}

/* Press transform for marketing buttons */
.press-scale:active {
  transform: scale(0.95);
}

/* ---------- Badges ---------- */
.badge-pill {
  display: inline-flex;
  align-items: center;
  background-color: var(--surface);
  color: var(--primary);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-full);
  padding: 4px 8px;
  font-size: 12px;
  font-weight: 600;
  line-height: 1.33;
  letter-spacing: 0.125px;
  text-transform: uppercase;
}

/* ---------- Text input ---------- */
.text-input,
.form-control.text-input,
input[type="text"].text-input,
input[type="email"].text-input,
input[type="password"].text-input,
input[type="number"].text-input,
input[type="date"].text-input,
textarea.text-input,
select.text-input {
  background-color: var(--surface);
  color: var(--ink);
  border: 1px solid var(--field-border);
  border-radius: var(--radius-xs);
  padding: 6px 10px;
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  width: 100%;
  transition: box-shadow 0.15s ease, border-color 0.15s ease;
}

.text-input:focus,
.form-control.text-input:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: var(--shadow-soft);
}

/* ---------- Cards ---------- */
.feature-card {
  background-color: var(--surface);
  color: var(--ink);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--hairline);
}

.feature-card-elevated {
  background-color: var(--surface);
  color: var(--ink);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  border: 1px solid var(--hairline);
  box-shadow: var(--shadow-soft);
}

/* Illustration tile — colour-blocked header band (decorative sticker palette) */
.illustration-tile {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--hairline);
  background-color: var(--surface);
}

.illustration-tile .tile-band {
  height: 96px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.illustration-tile .tile-body {
  padding: var(--space-lg);
}

.tile-purple  { background: linear-gradient(135deg, var(--accent-purple), #f3e7fc); }
.tile-pink    { background: linear-gradient(135deg, var(--accent-pink), #ffe0f3); }
.tile-orange  { background: linear-gradient(135deg, var(--accent-orange), #ffd9bd); }
.tile-teal    { background: linear-gradient(135deg, var(--accent-teal), #c7efee); }
.tile-green   { background: linear-gradient(135deg, var(--accent-green), #c9f0d1); }
.tile-sky     { background: linear-gradient(135deg, var(--accent-sky), #d7eafe); }
.tile-brown   { background: linear-gradient(135deg, var(--accent-brown), #e8d9c6); }

/* ---------- Nav bar ---------- */
.nav-bar {
  position: sticky;
  top: 0;
  z-index: 1030;
  background-color: var(--canvas);
  border-bottom: 1px solid var(--hairline);
  box-shadow: var(--shadow-elevated);
  padding: var(--space-md) 0;
}

.nav-bar .nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-md);
}

.nav-bar .nav-brand {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
}

.nav-bar .nav-brand:hover { color: var(--ink); }

.nav-bar .nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-bar .nav-links a {
  color: var(--ink-secondary);
  font-size: 15px;
  font-weight: 400;
  line-height: 1.33;
  text-decoration: none;
}

.nav-bar .nav-links a:hover { color: var(--ink); }
.nav-bar .nav-links a.active { color: var(--ink); font-weight: 500; }

.nav-bar .nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.nav-bar .nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  color: var(--ink);
  cursor: pointer;
  padding: 4px;
}

@media (max-width: 840px) {
  .nav-bar .nav-toggle { display: block; }
  .nav-bar .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--canvas);
    border-bottom: 1px solid var(--hairline);
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-xs);
    padding: var(--space-md);
    box-shadow: var(--shadow-soft);
  }
  .nav-bar .nav-links.open { display: flex; }
  .nav-bar .nav-actions .nav-login { display: none; }
}

/* ---------- Hero band (dark night) ---------- */
.hero-band {
  position: relative;
  background-color: var(--secondary);
  color: #ffffff;
  overflow: hidden;
}

.hero-band .hero-inner {
  position: relative;
  z-index: 2;
  padding: 120px 0;
  max-width: 1300px;
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
  text-align: center;
}

.hero-band .hero-eyebrow {
  color: rgba(255, 255, 255, 0.72);
  letter-spacing: 0.125px;
}

.hero-band h1 {
  color: #ffffff;
  max-width: 900px;
  margin: var(--space-lg) auto var(--space-md);
}

.hero-band .hero-sub {
  color: rgba(255, 255, 255, 0.82);
  font-size: 18px;
  max-width: 640px;
  margin: 0 auto var(--space-xxl);
}

.hero-band .hero-cta {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-band .button-secondary {
  background: rgba(255, 255, 255, 0.14);
  color: #ffffff;
  border: 1px solid rgba(255, 255, 255, 0.24);
  box-shadow: none;
}

.hero-band .button-secondary:hover {
  background: rgba(255, 255, 255, 0.22);
  color: #ffffff;
}

/* Sticker constellation — pure decorative */
.hero-stickers { position: absolute; inset: 0; pointer-events: none; }

.hero-sticker {
  position: absolute;
  border-radius: var(--radius-full);
  filter: blur(2px);
  opacity: 0.85;
}

.hero-star {
  position: absolute;
  width: 4px;
  height: 4px;
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.55);
}

@media (max-width: 600px) {
  .hero-band .hero-inner { padding: 80px 16px; }
}

/* ---------- Section scaffolding ---------- */
.section {
  padding: 96px 0;
}

.section-tight {
  padding: 64px 0;
}

.section-header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-xxl);
}

.section-header h2 {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -1px;
}

.section-header p {
  color: var(--ink-muted);
  font-size: 16px;
  margin-top: var(--space-sm);
}

/* ---------- Feature grid ---------- */
.grid-2up, .grid-3up, .grid-4up {
  display: grid;
  gap: var(--space-lg);
}

.grid-2up { grid-template-columns: repeat(2, 1fr); }
.grid-3up { grid-template-columns: repeat(3, 1fr); }
.grid-4up { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 840px) {
  .grid-3up, .grid-4up { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 600px) {
  .grid-2up, .grid-3up, .grid-4up { grid-template-columns: 1fr; }
}

/* ---------- Footer ---------- */
.site-footer {
  background-color: var(--secondary);
  color: rgba(255, 255, 255, 0.70);
  border-top: none;
  padding: var(--space-xxl) 0;
  margin-top: 0;
}

.site-footer .footer-cols {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.2fr;
  gap: var(--space-lg);
}

.site-footer h4 {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.125px;
  text-transform: uppercase;
  color: #ffffff;
  margin-bottom: var(--space-md);
}

.site-footer p,
.site-footer li,
.site-footer address {
  font-size: 14px;
  line-height: 1.43;
  color: rgba(255, 255, 255, 0.70);
}

.site-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.site-footer ul li { margin-bottom: var(--space-xs); }

.site-footer ul a {
  color: rgba(255, 255, 255, 0.70);
  text-decoration: none;
}

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

.site-footer .social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-full);
  background-color: transparent;
  border: 1px solid rgba(255, 255, 255, 0.30);
  color: rgba(255, 255, 255, 0.70);
  margin-right: var(--space-xs);
}

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

.site-footer .footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.20);
  margin-top: var(--space-xxl);
  padding-top: var(--space-lg);
  display: flex;
  justify-content: space-between;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.site-footer .footer-bottom p {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.70);
  margin: 0;
}

@media (max-width: 840px) {
  .site-footer .footer-cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 600px) {
  .site-footer .footer-cols { grid-template-columns: 1fr; }
}

/* ---------- Container (matches Bootstrap grid max width) ---------- */
.ds-container {
  max-width: 1200px;
  margin: 0 auto;
  padding-left: var(--space-md);
  padding-right: var(--space-md);
}