/* ==========================================================================
   StyleUp — Sống chất, mặc chất
   Base styles: variables, resets, typography, layout, header, footer, buttons
   ========================================================================== */

:root {
  /* Colors */
  --color-ink: #14161a;
  --color-ink-soft: #1c1f26;
  --color-navy: #071726;
  --color-navy-dark: #04101c;
  --color-accent: #dff43d;
  --color-accent-dark: #c3d92a;
  --color-heading: #15171c;
  --color-text: #6b6f76;
  --color-text-muted: #93979e;
  --color-bg: #ffffff;
  --color-bg-light: #f6f6f4;
  --color-cream: #f3efe8;
  --color-dust: #e6ddd0;
  --color-border: #e7e7e4;
  --color-white: #ffffff;

  /* Typography */
  --font-heading: "Poppins", sans-serif;
  --font-body: "Inter", sans-serif;

  /* Layout */
  --container-width: 1240px;
  --header-height: 84px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 26px;
  --radius-pill: 999px;

  /* Motion */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.2s var(--ease);
  --transition-base: 0.35s var(--ease);
  --transition-slow: 0.7s var(--ease);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}

svg {
  display: block;
}

/* ---------- Typography ---------- */
h1,
h2,
h3,
h4 {
  font-family: var(--font-heading);
  font-weight: 800;
  color: var(--color-heading);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

h1 {
  font-size: clamp(2.4rem, 4.6vw, 3.6rem);
  text-transform: uppercase;
}

h2 {
  font-size: clamp(1.5rem, 2.6vw, 2.1rem);
  text-transform: uppercase;
}

h3 {
  font-size: 1.05rem;
  font-weight: 700;
}

p {
  margin: 0;
}

.container {
  width: 100%;
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}

section {
  padding: 88px 0;
}

.bg-light {
  background: var(--color-bg-light);
}

.bg-cream {
  background: var(--color-cream);
}

.bg-white {
  background: var(--color-white);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent-dark);
  margin-bottom: 10px;
}

.section-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 48px;
}

.section-head.align-left {
  text-align: left;
  margin: 0;
}

.section-head-row {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.section-squiggle {
  display: block;
  margin: 10px auto 0;
}

.section-head.align-left .section-squiggle {
  margin: 10px 0 0;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 28px;
  border-radius: var(--radius-pill);
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
  white-space: nowrap;
}

.btn svg {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.btn-primary {
  background: var(--color-accent);
  color: var(--color-ink);
}

.btn-primary:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: 0 12px 24px -12px rgba(223, 244, 61, 0.55);
}

.btn-primary:hover svg {
  transform: translateX(3px);
}

.btn-outline {
  background: transparent;
  color: var(--color-ink);
  border: 1.5px solid var(--color-ink);
}

.btn-outline:hover {
  background: var(--color-ink);
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-outline-light {
  background: transparent;
  color: var(--color-white);
  border: 1.5px solid rgba(255, 255, 255, 0.4);
}

.btn-outline-light:hover {
  background: var(--color-white);
  color: var(--color-navy);
  border-color: var(--color-white);
  transform: translateY(-2px);
}

.btn-dark {
  background: var(--color-ink);
  color: var(--color-white);
}

.btn-dark:hover {
  background: var(--color-navy);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-ink);
  border-bottom: 1.5px solid var(--color-ink);
  padding-bottom: 2px;
  transition: color var(--transition-fast), gap var(--transition-fast);
}

.link-arrow svg {
  width: 15px;
  height: 15px;
  transition: transform var(--transition-fast);
}

.link-arrow:hover {
  color: var(--color-accent-dark);
  border-color: var(--color-accent-dark);
}

.link-arrow:hover svg {
  transform: translateX(3px);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid transparent;
  transition: box-shadow var(--transition-base), border-color var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: 0 8px 24px -18px rgba(15, 17, 20, 0.35);
  border-color: var(--color-border);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
  height: var(--header-height);
}

.brand {
  display: flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  flex-shrink: 0;
}

.brand-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  margin-left: 2px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 34px;
}

.main-nav a {
  position: relative;
  font-family: var(--font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--color-text);
  padding: 8px 0;
  transition: color var(--transition-fast);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: var(--color-ink);
  transition: width var(--transition-fast);
}

.main-nav a:hover {
  color: var(--color-ink);
}

.main-nav a:hover::after,
.main-nav a.is-active::after {
  width: 100%;
}

.main-nav a.is-active {
  color: var(--color-ink);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.header-icon-btn {
  position: relative;
  width: 38px;
  height: 38px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  color: var(--color-ink);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.header-icon-btn svg {
  width: 20px;
  height: 20px;
}

.header-icon-btn:hover {
  background: var(--color-bg-light);
}

.icon-badge {
  position: absolute;
  top: -2px;
  right: -2px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-ink);
  font-size: 0.62rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-heading);
}

.header-search {
  display: flex;
  align-items: center;
  overflow: hidden;
  max-width: 0;
  opacity: 0;
  transition: max-width var(--transition-base), opacity var(--transition-base);
}

.header-search.is-open {
  max-width: 220px;
  opacity: 1;
}

.header-search input {
  width: 100%;
  padding: 8px 10px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 0.85rem;
  background: var(--color-bg-light);
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  align-items: center;
  justify-content: center;
  color: var(--color-ink);
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

/* ---------- Icon circle (shared component default) ---------- */
.icon-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  min-width: 46px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-accent);
  flex-shrink: 0;
}

.icon-circle svg {
  width: 22px;
  height: 22px;
}

/* ---------- Reveal animation ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

[data-reveal-delay="0"] { transition-delay: 0s; }
[data-reveal-delay="1"] { transition-delay: 0.1s; }
[data-reveal-delay="2"] { transition-delay: 0.2s; }
[data-reveal-delay="3"] { transition-delay: 0.3s; }
[data-reveal-delay="4"] { transition-delay: 0.4s; }

/* ---------- Breadcrumb ---------- */
.breadcrumb-bar {
  background: var(--color-bg-light);
  padding: 20px 0;
}

.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--color-text-muted);
}

.breadcrumb a:hover {
  color: var(--color-ink);
}

.breadcrumb span[aria-current] {
  color: var(--color-ink);
}

.page-hero {
  padding: 56px 0 40px;
  text-align: center;
}

.page-hero .eyebrow {
  justify-content: center;
}

.page-hero p {
  max-width: 560px;
  margin: 14px auto 0;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-white);
  border-top: 1px solid var(--color-border);
}

.footer-main {
  padding: 72px 0 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr 1.2fr;
  gap: 40px;
}

.footer-desc {
  margin: 18px 0 22px;
  font-size: 0.92rem;
  max-width: 320px;
}

.footer-social {
  display: flex;
  gap: 10px;
}

.footer-social a {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.footer-social svg {
  width: 16px;
  height: 16px;
}

.footer-social a:hover {
  background: var(--color-ink);
  color: var(--color-white);
  border-color: var(--color-ink);
}

.footer-heading {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-heading);
  margin-bottom: 20px;
}

.footer-links li {
  margin-bottom: 12px;
}

.footer-links a {
  font-size: 0.92rem;
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-ink);
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.9rem;
}

.footer-contact svg {
  width: 17px;
  height: 17px;
  flex-shrink: 0;
  margin-top: 2px;
  color: var(--color-ink);
}

.footer-bottom {
  border-top: 1px solid var(--color-border);
  padding: 22px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  font-size: 0.82rem;
  color: var(--color-text-muted);
}

.footer-bottom .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.payment-row {
  display: flex;
  align-items: center;
  gap: 10px;
}

.payment-row span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 26px;
  border-radius: 5px;
  background: var(--color-bg-light);
  font-size: 0.6rem;
  font-weight: 700;
  color: var(--color-text-muted);
  letter-spacing: 0.02em;
}

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-ink);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base), visibility var(--transition-base);
  z-index: 90;
}

.back-to-top svg {
  width: 20px;
  height: 20px;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background: var(--color-accent);
  color: var(--color-ink);
}

/* ---------- Grid helpers ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}