/* =========================================================
   ARMCEO — Trang Our Story
   Kể chuyện thương hiệu theo lối editorial: ảnh lớn, chữ mảnh,
   nhiều khoảng thở, chuyển động chậm và có chủ đích.
   ========================================================= */

/* ---------- HERO ---------- */
.ab-hero {
  position: relative; min-height: clamp(460px, 78vh, 760px);
  display: flex; align-items: flex-end;
  overflow: hidden; background: #0e0e10; color: #fff;
}
.ab-hero__media { position: absolute; inset: 0; }
.ab-hero__media img {
  width: 100%; height: 100%; object-fit: cover;
  transform: scale(1.08);
  animation: abZoom 14s ease-out forwards;
}
@keyframes abZoom { to { transform: scale(1); } }
.ab-hero__media::after {
  content: ""; position: absolute; inset: 0;
  background:
    linear-gradient(0deg, rgba(8,8,10,.82) 0%, rgba(8,8,10,.30) 45%, rgba(8,8,10,.42) 100%);
}
.ab-hero__inner { position: relative; z-index: 2; width: 100%; padding-block: clamp(40px, 7vw, 90px); }
.ab-hero__title {
  font-family: var(--font-display); font-weight: 200; text-transform: uppercase;
  font-size: clamp(46px, 9vw, 130px); line-height: .92; letter-spacing: .015em;
  margin: 18px 0 0;
}
.ab-hero__lead {
  margin-top: 26px; max-width: 46ch; font-size: clamp(15px, 1.5vw, 19px);
  font-weight: 300; line-height: 1.85; color: rgba(255,255,255,.8);
}
.ab-scroll {
  position: absolute; right: clamp(20px, 3.4vw, 56px); bottom: 34px; z-index: 3;
  display: flex; align-items: center; gap: 12px;
  font-size: 10px; letter-spacing: .3em; text-transform: uppercase; color: rgba(255,255,255,.7);
}
.ab-scroll i {
  display: block; width: 1px; height: 46px; background: rgba(255,255,255,.4); position: relative; overflow: hidden;
}
.ab-scroll i::after {
  content: ""; position: absolute; inset: 0; background: #fff;
  animation: abLine 2.2s ease-in-out infinite;
}
@keyframes abLine { 0% { transform: translateY(-100%); } 60%, 100% { transform: translateY(100%); } }

/* ---------- TUYÊN NGÔN ---------- */
.ab-manifesto { padding-block: clamp(64px, 11vw, 150px); text-align: center; }
.ab-manifesto p {
  font-family: var(--font-display); font-weight: 200;
  font-size: clamp(22px, 3.6vw, 46px); line-height: 1.35; letter-spacing: .01em;
  /* Đủ rộng để câu dài nhất không bị ngắt giữa chừng */
  max-width: min(92vw, 680px); margin-inline: auto;
}
.ab-manifesto p em { font-style: italic; }
.ab-manifesto .sig {
  margin-top: 34px; font-size: 10.5px; letter-spacing: .34em;
  text-transform: uppercase; color: var(--muted);
}
/* hiệu ứng từng dòng hiện lên */
.ab-line { display: block; overflow: hidden; }
.ab-line > span { display: block; transition: transform 1s cubic-bezier(.2,.7,.2,1); }
/* Chỉ giấu chữ khi JS chạy được — không có JS thì vẫn đọc bình thường */
.js .ab-line > span { transform: translateY(105%); }
.is-in .ab-line > span { transform: none; }
.is-in .ab-line:nth-child(2) > span { transition-delay: .1s; }
.is-in .ab-line:nth-child(3) > span { transition-delay: .2s; }
.is-in .ab-line:nth-child(4) > span { transition-delay: .3s; }

/* ---------- SỐ LIỆU ---------- */
.ab-stats { border-block: 1px solid var(--line); }
.ab-stats__grid { display: grid; grid-template-columns: repeat(4, 1fr); }
.ab-stat { padding: clamp(28px, 4vw, 54px) 20px; text-align: center; position: relative; }
.ab-stat + .ab-stat::before {
  content: ""; position: absolute; left: 0; top: 22%; bottom: 22%; width: 1px; background: var(--line);
}
.ab-stat b {
  display: block; font-family: var(--font-display); font-weight: 300;
  font-size: clamp(34px, 4.6vw, 62px); line-height: 1; letter-spacing: -.01em;
  font-variant-numeric: tabular-nums;
}
.ab-stat span {
  display: block; margin-top: 12px; font-size: 10.5px; letter-spacing: .26em;
  text-transform: uppercase; color: var(--muted);
}

/* ---------- HÀNH TRÌNH ---------- */
.ab-section { padding-block: clamp(56px, 9vw, 120px); }
.ab-head { max-width: 620px; margin-bottom: clamp(32px, 5vw, 64px); }
.ab-kicker {
  display: flex; align-items: center; gap: 13px;
  font-size: 10.5px; letter-spacing: .34em; text-transform: uppercase; color: var(--muted);
}
.ab-kicker::before { content: ""; width: 30px; height: 1px; background: currentColor; }
.ab-title {
  font-family: var(--font-display); font-weight: 200; text-transform: uppercase;
  font-size: clamp(28px, 4.2vw, 56px); line-height: 1.05; letter-spacing: .015em; margin-top: 16px;
}
.ab-desc { margin-top: 18px; color: #5c5c62; font-size: 15px; line-height: 1.85; max-width: 56ch; }

.ab-timeline { position: relative; display: grid; gap: clamp(26px, 4vw, 52px); }
.ab-timeline::before {
  content: ""; position: absolute; left: 88px; top: 8px; bottom: 8px; width: 1px; background: var(--line);
}
.ab-mile {
  display: grid; grid-template-columns: 88px 1fr; gap: clamp(22px, 4vw, 54px);
  align-items: start; position: relative;
  transition: opacity .8s var(--ease), transform .8s var(--ease);
}
.js .ab-mile { opacity: 0; transform: translateY(24px); }
.is-in .ab-mile { opacity: 1; transform: none; }
.is-in .ab-mile:nth-child(2) { transition-delay: .08s; }
.is-in .ab-mile:nth-child(3) { transition-delay: .16s; }
.is-in .ab-mile:nth-child(4) { transition-delay: .24s; }
.is-in .ab-mile:nth-child(5) { transition-delay: .32s; }
.ab-mile__year {
  font-family: var(--font-display); font-weight: 300; font-size: 21px;
  text-align: right; padding-top: 2px; font-variant-numeric: tabular-nums;
}
.ab-mile__body { position: relative; padding-left: clamp(22px, 3vw, 40px); }
.ab-mile__body::before {
  content: ""; position: absolute; left: -4.5px; top: 9px;
  width: 9px; height: 9px; border-radius: 50%; background: var(--ink);
  box-shadow: 0 0 0 5px var(--white);
}
.ab-mile h3 { font-size: 16px; font-weight: 600; letter-spacing: .01em; }
.ab-mile p { margin-top: 9px; color: #5c5c62; font-size: 14px; line-height: 1.8; max-width: 58ch; }

/* ---------- GIÁ TRỊ ---------- */
.ab-values { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--line); }
.ab-value {
  background: var(--white); padding: clamp(26px, 3vw, 42px);
  transition: background .3s var(--ease);
}
.ab-value:hover { background: var(--paper); }
.ab-value b {
  font-family: var(--font-display); font-weight: 300; font-size: 13px;
  letter-spacing: .2em; color: var(--muted); display: block;
}
.ab-value h3 {
  margin-top: 22px; font-family: var(--font-display); font-weight: 400;
  font-size: clamp(17px, 1.7vw, 22px); letter-spacing: .02em; text-transform: uppercase;
}
.ab-value p { margin-top: 14px; color: #5c5c62; font-size: 13.5px; line-height: 1.8; }

/* ---------- HÀNG XEN KẼ ẢNH / CHỮ ---------- */
.ab-split {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(24px, 5vw, 76px); align-items: center;
  padding-block: clamp(36px, 6vw, 74px);
}
.ab-split + .ab-split { border-top: 1px solid var(--line); }
.ab-split--flip .ab-split__media { order: 2; }
.ab-split__media {
  position: relative; aspect-ratio: 4 / 3; overflow: hidden; border-radius: 2px; background: var(--panel);
}
.ab-split__media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 1.4s var(--ease);
}
.js .ab-split__media img { transform: scale(1.06); }
.is-in .ab-split__media img { transform: scale(1); }
.ab-split__media figcaption {
  position: absolute; left: 16px; bottom: 14px;
  font-size: 9.5px; letter-spacing: .26em; text-transform: uppercase;
  color: rgba(255,255,255,.9); text-shadow: 0 1px 8px rgba(0,0,0,.5);
}
.ab-split h3 {
  font-family: var(--font-display); font-weight: 200; text-transform: uppercase;
  font-size: clamp(24px, 3.2vw, 40px); line-height: 1.1; letter-spacing: .015em; margin-top: 16px;
}
.ab-split p { margin-top: 18px; color: #5c5c62; font-size: 15px; line-height: 1.9; }
.ab-facts { margin-top: 26px; display: grid; gap: 12px; }
.ab-fact {
  display: flex; gap: 14px; align-items: baseline;
  font-size: 13.5px; padding-bottom: 12px; border-bottom: 1px solid var(--line);
}
.ab-fact b { font-family: var(--font-display); font-weight: 400; min-width: 54px; }
.ab-fact span { color: #5c5c62; }

/* ---------- DẢI ẢNH LỚN ---------- */
.ab-band {
  position: relative; min-height: clamp(280px, 40vw, 520px);
  display: flex; align-items: center; overflow: hidden; background: #131315; color: #fff;
}
.ab-band__media { position: absolute; inset: 0; }
.ab-band__media img { width: 100%; height: 100%; object-fit: cover; }
.ab-band__media::after {
  content: ""; position: absolute; inset: 0;
  background: linear-gradient(90deg, rgba(10,10,12,.74) 0%, rgba(10,10,12,.34) 60%, rgba(10,10,12,.2) 100%);
}
.ab-band__inner { position: relative; z-index: 2; width: 100%; }
.ab-band h2 {
  font-family: var(--font-display); font-weight: 200; text-transform: uppercase;
  font-size: clamp(26px, 4vw, 52px); line-height: 1.1; margin-top: 16px; max-width: 16ch;
}
.ab-band p { margin-top: 20px; max-width: 44ch; color: rgba(255,255,255,.76); line-height: 1.9; font-weight: 300; }

/* ---------- CTA ---------- */
.ab-cta { text-align: center; padding-block: clamp(56px, 9vw, 120px); }
.ab-cta h2 {
  font-family: var(--font-display); font-weight: 200; text-transform: uppercase;
  font-size: clamp(26px, 4vw, 52px); line-height: 1.1; letter-spacing: .015em;
}
.ab-cta p { margin-top: 18px; color: #5c5c62; max-width: 46ch; margin-inline: auto; line-height: 1.85; }
.ab-cta__btns { margin-top: 34px; display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }

/* ---------- Responsive ---------- */
@media (max-width: 1000px) {
  .ab-values { grid-template-columns: 1fr 1fr; }
  .ab-stats__grid { grid-template-columns: 1fr 1fr; }
  .ab-stat:nth-child(3)::before, .ab-stat:nth-child(odd)::before { display: none; }
  .ab-stat:nth-child(3), .ab-stat:nth-child(4) { border-top: 1px solid var(--line); }
}
@media (max-width: 760px) {
  /* Chỉ dẫn cuộn là tiện ích của desktop — trên mobile nó đè lên chữ */
  .ab-scroll { display: none; }
  .ab-hero__lead { max-width: none; }
  .ab-split, .ab-split--flip .ab-split__media { grid-template-columns: 1fr; order: 0; }
  .ab-timeline::before { left: 4px; }
  .ab-mile { grid-template-columns: 1fr; gap: 6px; }
  .ab-mile__year { text-align: left; padding-left: 26px; color: var(--muted); font-size: 18px; }
  .ab-mile__body { padding-left: 26px; }
  .ab-mile__body::before { left: -.5px; }
  .ab-values { grid-template-columns: 1fr; }
  .ab-manifesto p { max-width: none; }
}

@media (prefers-reduced-motion: reduce) {
  .ab-hero__media img { animation: none; transform: none; }
  .ab-scroll i::after { animation: none; }
  .ab-line > span, .ab-mile { transform: none !important; opacity: 1 !important; }
  .ab-split__media img { transform: none !important; }
}