/* Sài Thành Group — palette: cam chủ đạo #F26522, nền sáng, chữ đậm */
:root {
  --orange: #f26522;
  --orange-dark: #d65518;
  --ink: #0f0f0f;
  --muted: #5a5a5a;
  --line: #e8e8e8;
  --bg: #ffffff;
  --bg-tint: #f7f7f8;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 12px 40px rgba(15, 15, 15, 0.08);
  --font: "SF Pro Display", "SF Pro Text", -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --wrap: 1120px;
  --header-h: 72px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 12px);
}

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 17px;
  line-height: 1.55;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

a:hover {
  color: var(--orange);
}

.wrap {
  width: min(100% - 40px, var(--wrap));
  margin-inline: auto;
}

.narrow {
  width: min(100% - 40px, 560px);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  height: var(--header-h);
  display: flex;
  align-items: center;
  gap: 20px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  letter-spacing: -0.02em;
  text-decoration: none;
  color: var(--ink);
}

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

.brand__mark {
  width: 34px;
  height: 22px;
  position: relative;
  flex-shrink: 0;
}

.brand__mark::before,
.brand__mark::after {
  content: "";
  position: absolute;
  background: var(--orange);
  transform: skewX(-14deg);
  border-radius: 2px;
}

.brand__mark::before {
  width: 12px;
  height: 20px;
  left: 0;
  top: 1px;
}

.brand__mark::after {
  width: 10px;
  height: 16px;
  left: 14px;
  top: 4px;
  opacity: 0.92;
}

.brand__name {
  font-size: 1.05rem;
}

.nav {
  margin-left: auto;
  display: none;
  gap: 22px;
  font-size: 0.95rem;
}

.nav a {
  text-decoration: none;
  color: var(--muted);
}

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

@media (min-width: 880px) {
  .nav {
    display: flex;
    flex-wrap: wrap;
    justify-content: flex-end;
    row-gap: 4px;
    column-gap: 12px;
    max-width: min(100%, 520px);
    font-size: 0.82rem;
  }
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 18px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease,
    transform 0.12s ease;
  font-family: inherit;
}

.btn:active {
  transform: translateY(1px);
}

.btn--primary {
  background: var(--orange);
  color: #fff;
}

.btn--primary:hover {
  background: var(--orange-dark);
  color: #fff;
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}

.btn--ghost:hover {
  border-color: #cfcfcf;
  color: var(--ink);
}

.btn--sm {
  padding: 9px 14px;
  font-size: 0.88rem;
}

.btn--lg {
  padding: 14px 20px;
  font-size: 1rem;
}

.btn--block {
  width: 100%;
}

/* Hero */
.hero {
  padding: clamp(32px, 6vw, 72px) 0 clamp(48px, 7vw, 88px);
  position: relative;
  overflow: hidden;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

@media (min-width: 900px) {
  .hero__grid {
    grid-template-columns: 1.05fr 0.65fr;
    gap: 48px;
  }
}

.hero__copy h1 {
  margin: 0 0 16px;
  font-size: clamp(1.85rem, 4vw, 2.75rem);
  line-height: 1.12;
  letter-spacing: -0.03em;
}

.hero__copy h1 strong {
  color: var(--orange-dark);
  font-weight: 800;
}

.eyebrow {
  margin: 0 0 12px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--orange);
}

.hero__lead {
  margin: 0 0 24px;
  color: var(--muted);
  max-width: 52ch;
}

.hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 22px;
}

.hero__ticks {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero__ticks li {
  padding-left: 22px;
  position: relative;
}

.hero__ticks li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--orange);
  opacity: 0.9;
}

.hero__visual {
  min-height: 200px;
  position: relative;
}

.hero__shape {
  position: absolute;
  inset: 0;
  margin: auto;
  width: min(100%, 360px);
  height: 320px;
  background: linear-gradient(
    135deg,
    var(--orange) 0%,
    #ff8a4c 45%,
    var(--orange-dark) 100%
  );
  clip-path: polygon(18% 8%, 100% 0, 78% 100%, 0 92%);
  opacity: 0.95;
  filter: drop-shadow(0 24px 48px rgba(242, 101, 34, 0.35));
}

/* Sections */
.section {
  padding: clamp(48px, 6vw, 88px) 0;
}

.section--tint {
  background: var(--bg-tint);
  border-block: 1px solid var(--line);
}

.section--dark {
  background: #101010;
  color: #f2f2f2;
}

.section__title {
  margin: 0 0 12px;
  font-size: clamp(1.45rem, 2.6vw, 2rem);
  letter-spacing: -0.02em;
}

.section__title--light {
  color: #fff;
}

.section__title--brands {
  font-size: clamp(1.2rem, 3.2vw, 1.85rem);
  line-height: 1.28;
  text-wrap: balance;
  max-width: 100%;
}

.section__lead {
  margin: 0 0 28px;
  color: var(--muted);
  max-width: 62ch;
}

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

.section__lead--light {
  color: #c9c9c9;
}

.section--pain {
  background: linear-gradient(180deg, #fffaf7 0%, #fff 40%);
  border-block: 1px solid #f2e8e2;
}

.pain-list {
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.pain-list li {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  box-shadow: 0 4px 20px rgba(15, 15, 15, 0.04);
  line-height: 1.5;
}

.pain-close {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--radius);
  border-left: 4px solid var(--orange);
  background: var(--bg-tint);
  color: var(--ink);
  font-size: 1.02rem;
}

.trust-badges {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

@media (min-width: 640px) {
  .trust-badges {
    grid-template-columns: 1fr 1fr;
  }
}

.trust-badges li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 14px 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: #fff;
  font-size: 0.95rem;
  line-height: 1.45;
}

.trust-badges__mark {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: rgba(242, 101, 34, 0.12);
  color: var(--orange-dark);
  font-weight: 800;
  font-size: 0.75rem;
  display: grid;
  place-items: center;
  margin-top: 2px;
}

.scarcity-box {
  margin: 0 0 24px;
  padding: 16px 18px;
  border-radius: var(--radius);
  border: 1px dashed var(--orange);
  background: rgba(242, 101, 34, 0.06);
  color: var(--ink);
  font-size: 0.98rem;
  line-height: 1.5;
}

.scarcity-box p {
  margin: 0;
}

.section__cta {
  margin: 0;
  text-align: center;
}

.section--commit {
  background: #fafafa;
  border-block: 1px solid var(--line);
}

.commit-card {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px 22px;
  border-radius: var(--radius-lg);
  border: 2px solid var(--orange);
  background: #fff;
  box-shadow: var(--shadow);
}

.commit-card__lead {
  margin: 0 0 16px;
  font-size: 1.08rem;
  line-height: 1.5;
}

.commit-card__list {
  margin: 0 0 16px;
  padding-left: 1.15rem;
  color: var(--muted);
  line-height: 1.55;
}

.commit-card__list li + li {
  margin-top: 10px;
}

.commit-card__foot {
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 1.02rem;
  line-height: 1.5;
  color: var(--ink);
}

/* Benefits */
.benefits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

@media (min-width: 720px) {
  .benefits {
    grid-template-columns: 1fr 1fr;
  }

  .benefits > li:last-child:nth-child(odd) {
    grid-column: 1 / -1;
  }
}

.benefits > li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: #fff;
  box-shadow: var(--shadow);
}

.benefits__n {
  width: 40px;
  height: 40px;
  border-radius: 12px;
  background: var(--orange);
  color: #fff;
  font-weight: 700;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.benefits h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}

.benefits p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

/* Split + aside */
.split {
  display: grid;
  gap: 28px;
}

@media (min-width: 880px) {
  .split {
    grid-template-columns: 1.2fr 0.8fr;
    align-items: start;
    gap: 40px;
  }
}

.list-plain {
  margin: 0;
  padding-left: 1.1rem;
  color: var(--muted);
}

.list-plain li + li {
  margin-top: 10px;
}

.aside-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 24px;
  background: #fff;
  box-shadow: var(--shadow);
}

.aside-card__title {
  margin: 0 0 12px;
  font-size: 1.1rem;
}

.aside-card__list {
  margin: 0 0 18px;
  padding-left: 1.1rem;
  color: var(--muted);
}

.aside-card__list li + li {
  margin-top: 8px;
}

/* Lineup */
.lineup {
  margin: 8px 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--line);
  box-shadow: var(--shadow);
  background: #fff;
}

.lineup img {
  width: 100%;
}

/* Form */
.lead-form {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px 16px;
  margin-top: 8px;
}

@media (min-width: 520px) {
  .lead-form {
    grid-template-columns: 1fr 1fr;
  }
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field--full {
  grid-column: 1 / -1;
}

.field label,
.field legend {
  font-size: 0.88rem;
  font-weight: 600;
  color: #d0d0d0;
}

/* Chọn người liên hệ — tách khỏi .field để radio không bị style input full-width */
.contact-pick {
  margin: 4px 0 0;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 12px;
  grid-column: 1 / -1;
  min-width: 0;
  background: rgba(0, 0, 0, 0.2);
}

.contact-pick__legend {
  padding: 14px 16px 6px;
  font-size: 0.88rem;
  font-weight: 600;
  color: #d0d0d0;
}

.contact-pick__options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 4px 12px 14px;
}

.contact-pick__row {
  display: grid;
  grid-template-columns: 22px 1fr;
  gap: 12px;
  align-items: start;
  margin: 0;
  padding: 12px 14px;
  border-radius: 10px;
  border: 1px solid #383838;
  background: rgba(255, 255, 255, 0.04);
  cursor: pointer;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.contact-pick__row:hover {
  border-color: #555;
  background: rgba(255, 255, 255, 0.06);
}

.contact-pick__row:has(input:checked) {
  border-color: var(--orange);
  background: rgba(242, 101, 34, 0.1);
}

.contact-pick__row input[type="radio"] {
  width: 18px;
  height: 18px;
  margin: 3px 0 0;
  accent-color: var(--orange);
  cursor: pointer;
}

.contact-pick__text {
  font-size: 0.95rem;
  font-weight: 500;
  color: #ececec;
  line-height: 1.4;
}

.contact-pick__num {
  font-weight: 600;
  color: #fff;
  font-variant-numeric: tabular-nums;
}

.field input,
.field select,
.field textarea {
  width: 100%;
  border: 1px solid #333;
  border-radius: 10px;
  padding: 12px 12px;
  font: inherit;
  background: #181818;
  color: #fafafa;
  outline: none;
}

.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(242, 101, 34, 0.25);
}

.form-hint {
  grid-column: 1 / -1;
  margin: 4px 0 0;
  font-size: 0.82rem;
  color: #9a9a9a;
}

.success {
  margin-top: 16px;
  padding: 14px 16px;
  border-radius: 10px;
  border: 1px solid #333;
  background: #161616;
  color: #eaeaea;
}

.success a {
  color: #fff;
  text-decoration: underline;
}

/* Footer */
.site-footer {
  background: #fafafa;
  border-top: 1px solid var(--line);
  padding: 40px 0 20px;
  font-size: 0.95rem;
}

.site-footer__grid {
  display: grid;
  gap: 24px;
}

@media (min-width: 800px) {
  .site-footer__grid {
    grid-template-columns: 1.1fr 1fr 1fr 1fr;
  }
}

.brand--footer {
  margin-bottom: 8px;
}

.footer-tag {
  margin: 0;
  color: var(--muted);
}

.footer-heading {
  margin: 0 0 8px;
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.site-footer p {
  margin: 0;
  color: var(--ink);
}

.site-footer__bottom {
  margin-top: 28px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 0.85rem;
  color: var(--muted);
}