/* Trang công khai của HiCalling: trang chủ + điều khoản + quyền riêng tư.
 *
 * Bảng màu lấy thẳng từ logo app: nền cyan #79DFEB, chữ xanh đậm, điểm nhấn
 * cam của chữ "Hi". Trang admin dùng assets/admin.css riêng, không liên quan.
 */

:root {
  --sky:        #79DFEB;
  --sky-light:  #E9FAFD;
  --sky-mid:    #B8EEF6;
  --blue:       #2E6FD9;
  --blue-deep:  #1B4696;
  --ink:        #10315F;
  --ink-soft:   #35507A;
  --teal:       #22B8C4;
  --orange:     #FF8A1F;
  --amber:      #FFC23C;
  --white:      #FFFFFF;
  --grey:       #5B7599;
  --line:       #D9EDF5;
  --radius:     22px;
  --shadow:     0 10px 30px rgba(16, 49, 95, .10);
  --shadow-lg:  0 20px 50px rgba(16, 49, 95, .16);
  --max:        1120px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, Roboto,
               "Helvetica Neue", Arial, sans-serif;
  color: var(--ink);
  background: var(--white);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a   { color: var(--blue); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* ---------------------------------------------------------------- thanh đầu */

.site-head {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255,255,255,.88);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--line);
}
.site-head .wrap {
  display: flex; align-items: center; gap: 16px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.brand img { width: 38px; height: 38px; border-radius: 11px; }
.brand b { color: var(--ink); font-size: 19px; letter-spacing: -.2px; }
.brand b em { color: var(--orange); font-style: normal; }

.site-nav { margin-left: auto; display: flex; align-items: center; gap: 26px; }
.site-nav a {
  color: var(--ink); text-decoration: none; font-weight: 600; font-size: 15px;
}
.site-nav a:hover { color: var(--blue); }

.btn {
  display: inline-block; text-decoration: none; font-weight: 700;
  padding: 13px 26px; border-radius: 999px; border: 0; cursor: pointer;
  font-size: 15.5px; line-height: 1.2; transition: transform .15s ease, box-shadow .15s ease;
}
.btn-primary {
  background: linear-gradient(135deg, var(--amber), var(--orange));
  color: #4A2400; box-shadow: 0 8px 22px rgba(255, 138, 31, .38);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 28px rgba(255,138,31,.46); }
.btn-ghost { background: var(--white); color: var(--blue-deep); box-shadow: var(--shadow); }
.btn-sm { padding: 10px 20px; font-size: 14.5px; }

/* ------------------------------------------------------------------- hero */

.hero {
  background:
    radial-gradient(900px 420px at 12% -10%, #FFFFFF 0%, rgba(255,255,255,0) 60%),
    linear-gradient(165deg, var(--sky) 0%, #9DE8F2 45%, var(--sky-light) 100%);
  padding: 74px 0 92px;
  position: relative; overflow: hidden;
}
.hero::after {
  /* Vệt sáng chéo như trên logo app. */
  content: ""; position: absolute; inset: auto -10% -40% -10%; height: 55%;
  background: rgba(255,255,255,.30);
  transform: rotate(-6deg);
}
.hero .wrap { position: relative; z-index: 1; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 52px; align-items: center; }

.hero h1 {
  font-size: clamp(34px, 5.2vw, 56px); line-height: 1.1; margin: 0 0 18px;
  letter-spacing: -1.2px; color: var(--blue-deep);
}
.hero p.lead { font-size: clamp(16.5px, 2vw, 19.5px); color: #1C4F86; margin: 0 0 30px; max-width: 40ch; }
.hero-note { margin: 14px 0 0; font-size: 14px; color: #23608F; font-weight: 600; }

.hero-art { display: flex; justify-content: center; }
.hero-art img {
  width: min(320px, 76%); border-radius: 34px;
  box-shadow: var(--shadow-lg);
}

.pill {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(255,255,255,.75); color: var(--blue-deep);
  padding: 7px 15px; border-radius: 999px; font-size: 13.5px; font-weight: 700;
  margin-bottom: 20px;
}

/* ---------------------------------------------------------------- khối chung */

section { padding: 80px 0; }
section.tint { background: var(--sky-light); }
/* Hai khối nền xanh liền nhau: bỏ padding trên của khối sau, nếu không hai
   lần 80px cộng lại thành một mảng trống giữa trang. */
section.tint + section.tint { padding-top: 0; }

.sec-title {
  font-size: clamp(26px, 3.4vw, 38px); line-height: 1.2; margin: 0 0 12px;
  text-align: center; letter-spacing: -.6px; color: var(--blue-deep);
}
.sec-sub { text-align: center; color: var(--grey); margin: 0 auto 48px; max-width: 56ch; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--white); border-radius: var(--radius); padding: 30px 26px;
  box-shadow: var(--shadow); border: 1px solid var(--line);
  transition: transform .18s ease, box-shadow .18s ease;
}
.card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.card .emoji {
  font-size: 30px; line-height: 1; display: flex; align-items: center; justify-content: center;
  width: 58px; height: 58px; border-radius: 17px; margin-bottom: 16px;
  background: linear-gradient(140deg, var(--sky-mid), var(--sky-light));
}
.card h3 { margin: 0 0 8px; font-size: 19px; color: var(--blue-deep); }
.card p  { margin: 0; color: var(--grey); font-size: 15.2px; }

/* --------------------------------------------------------------- các bước */

.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; counter-reset: s; }
.step { text-align: center; }
.step .num {
  counter-increment: s; width: 54px; height: 54px; margin: 0 auto 16px;
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--amber), var(--orange));
  color: #4A2400; font-weight: 800; font-size: 21px;
  box-shadow: 0 8px 20px rgba(255,138,31,.32);
}
.step .num::before { content: counter(s); }
.step h3 { margin: 0 0 6px; font-size: 18px; color: var(--blue-deep); }
.step p  { margin: 0; color: var(--grey); font-size: 15.2px; }

/* ------------------------------------------------------------------ ảnh app */

.shots { display: flex; gap: 24px; justify-content: center; flex-wrap: wrap; }
.shots img {
  width: 230px; border-radius: 28px; box-shadow: var(--shadow-lg);
  border: 1px solid var(--line);
}

/* ------------------------------------------------------------------ an toàn */

.safety {
  background: linear-gradient(135deg, var(--blue-deep), var(--blue));
  color: var(--white); border-radius: 30px; padding: 52px 44px; text-align: center;
}
.safety h2 { color: var(--white); margin: 0 0 14px; font-size: clamp(24px, 3vw, 32px); }
.safety p  { margin: 0 auto; max-width: 62ch; color: #D6E8FF; font-size: 16.5px; }
.safety .shield { font-size: 42px; margin-bottom: 8px; }

/* ------------------------------------------------------------------ liên hệ */

.contact { text-align: center; }
.contact .mail {
  display: inline-block; margin-top: 8px; font-size: clamp(19px, 2.6vw, 26px);
  font-weight: 800; color: var(--blue); text-decoration: none; letter-spacing: -.3px;
}
.contact .mail:hover { color: var(--orange); }
.contact .hours { color: var(--grey); margin-top: 10px; }

/* ------------------------------------------------------------------- chân trang */

.site-foot {
  background: var(--ink); color: #A9C4E4; padding: 46px 0 34px; font-size: 14.6px;
}
.site-foot .cols { display: flex; gap: 30px; flex-wrap: wrap; align-items: flex-start; }
.site-foot .brand b { color: var(--white); }
.site-foot nav { margin-left: auto; display: flex; gap: 26px; flex-wrap: wrap; }
.site-foot a { color: #A9C4E4; text-decoration: none; }
.site-foot a:hover { color: var(--white); }
.site-foot .copy {
  margin-top: 30px; padding-top: 22px; border-top: 1px solid rgba(255,255,255,.13);
  display: flex; gap: 14px; justify-content: space-between; flex-wrap: wrap;
}

/* ------------------------------------------------------- trang điều khoản */

.legal-hero {
  background: linear-gradient(165deg, var(--sky) 0%, var(--sky-light) 100%);
  padding: 54px 0 46px; text-align: center;
}
.legal-hero h1 { margin: 0 0 8px; font-size: clamp(28px, 4vw, 42px); color: var(--blue-deep); letter-spacing: -.8px; }
.legal-hero .meta { color: #23608F; font-weight: 600; font-size: 14.5px; }

.legal-tabs { display: flex; gap: 10px; justify-content: center; margin-top: 22px; }
.legal-tabs a {
  background: rgba(255,255,255,.7); color: var(--blue-deep); text-decoration: none;
  padding: 9px 20px; border-radius: 999px; font-weight: 700; font-size: 14.5px;
}
.legal-tabs a.on { background: var(--white); box-shadow: var(--shadow); }

.legal-body { max-width: 780px; margin: -28px auto 0; padding: 0 20px 80px; }
.legal-card {
  background: var(--white); border-radius: 26px; padding: 44px 42px;
  box-shadow: var(--shadow-lg); border: 1px solid var(--line);
}
.legal-card h2 {
  font-size: 21px; color: var(--blue-deep); margin: 36px 0 12px;
  padding-top: 18px; border-top: 1px solid var(--line);
}
.legal-card h2:first-child { margin-top: 0; padding-top: 0; border-top: 0; }
.legal-card p, .legal-card li { color: #35507A; font-size: 15.8px; }
.legal-card ul { padding-left: 22px; }
.legal-card li { margin-bottom: 7px; }
.legal-card strong { color: var(--ink); }
.legal-card .callout {
  background: var(--sky-light); border-left: 4px solid var(--teal);
  border-radius: 12px; padding: 16px 20px; margin: 20px 0;
}
.legal-card .callout p:last-child { margin-bottom: 0; }

/* --------------------------------------------------------------- điện thoại */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; gap: 34px; text-align: center; }
  .hero p.lead { margin-left: auto; margin-right: auto; }
  .cards, .steps { grid-template-columns: repeat(2, 1fr); }
  .site-nav { gap: 16px; }
  .site-nav .hide-sm { display: none; }
}

@media (max-width: 600px) {
  .hero { padding: 52px 0 66px; }
  section { padding: 58px 0; }
  .cards, .steps { grid-template-columns: 1fr; }
  .safety { padding: 38px 24px; border-radius: 24px; }
  .legal-card { padding: 30px 22px; border-radius: 20px; }
  .site-foot nav { margin-left: 0; gap: 18px; }
}