/* ==========================================================================
   Dental+ Nha khoa thẩm mỹ
   Base styles: variables, resets, typography, layout, header, footer, buttons
   ========================================================================== */

:root {
  /* Colors */
  --color-primary: #1a47e0;
  --color-primary-dark: #0e2f9e;
  --color-primary-light: #e9f0ff;
  --color-navy: #0b1742;
  --color-heading: #0b1742;
  --color-text: #57617c;
  --color-text-muted: #8790a8;
  --color-bg: #ffffff;
  --color-bg-light: #f5f8ff;
  --color-border: #e5eaf6;
  --color-white: #ffffff;
  --color-gold: #f5a623;
  --color-footer-bg: #0c2f97;
  --color-footer-bg-dark: #081f6b;

  /* Typography */
  --font-heading: "Lora", serif;
  --font-body: "Be Vietnam Pro", 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: 700;
  color: var(--color-heading);
  line-height: 1.28;
}

h1 {
  font-size: clamp(2.2rem, 4.2vw, 3.15rem);
  letter-spacing: -0.01em;
}

h2 {
  font-size: clamp(1.55rem, 2.6vw, 2.1rem);
  letter-spacing: -0.01em;
}

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

p {
  color: var(--color-text);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
  margin-bottom: 12px;
}

.eyebrow svg {
  width: 14px;
  height: 14px;
}

.section-head {
  max-width: 620px;
  margin: 0 auto 44px;
  text-align: center;
}

.section-head p {
  margin-top: 14px;
  font-size: 1rem;
}

.section-head.align-left {
  margin: 0 0 40px;
  text-align: left;
}

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

section {
  padding: 84px 0;
}

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

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

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 14px 26px;
  border-radius: var(--radius-pill);
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  white-space: nowrap;
  transition: background var(--transition-fast), color var(--transition-fast),
    border-color var(--transition-fast), transform var(--transition-fast),
    box-shadow var(--transition-fast);
}

.btn svg {
  width: 17px;
  height: 17px;
}

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

.btn-primary:hover {
  background: var(--color-primary-dark);
  box-shadow: 0 14px 30px -14px rgba(26, 71, 224, 0.55);
  transform: translateY(-2px);
}

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

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

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

.btn-outline:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  transform: translateY(-2px);
}

.btn-block {
  width: 100%;
  justify-content: center;
}

.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.86rem;
  color: var(--color-primary);
  transition: gap var(--transition-fast), color var(--transition-fast);
}

.link-arrow svg {
  width: 15px;
  height: 15px;
}

.link-arrow:hover {
  gap: 10px;
  color: var(--color-primary-dark);
}

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 500;
  background: rgba(255, 255, 255, 0.97);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow var(--transition-base);
}

.site-header.is-scrolled {
  box-shadow: 0 8px 26px -16px rgba(11, 23, 66, 0.16);
}

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: var(--header-height);
}

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

.brand-mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  color: var(--color-primary);
}

.brand-mark svg {
  width: 100%;
  height: 100%;
}

.brand-name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.32rem;
  letter-spacing: -0.01em;
  color: var(--color-heading);
  line-height: 1.1;
}

.brand-name .plus {
  color: var(--color-primary);
}

.brand-tagline {
  display: block;
  font-family: var(--font-body);
  font-size: 0.56rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-top: 3px;
}

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
}

.main-nav a {
  position: relative;
  font-family: var(--font-body);
  font-size: 0.93rem;
  font-weight: 600;
  color: var(--color-heading);
  padding: 8px 0;
  transition: color var(--transition-fast);
}

.main-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 2px;
  border-radius: var(--radius-pill);
  background: var(--color-primary);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-fast);
}

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

.main-nav a:hover::after,
.main-nav a.is-active::after {
  transform: scaleX(1);
}

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

.header-actions {
  display: flex;
  align-items: center;
  gap: 20px;
}

.header-phone {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.header-phone svg {
  width: 30px;
  height: 30px;
  padding: 7px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  flex-shrink: 0;
}

.header-phone-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.header-phone-text span {
  font-size: 0.68rem;
  color: var(--color-text-muted);
}

.header-phone-text strong {
  font-family: var(--font-heading);
  font-size: 0.94rem;
  color: var(--color-heading);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  align-items: center;
  justify-content: center;
  color: var(--color-heading);
}

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

/* ---------- Back to top ---------- */
.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 26px;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 16px 32px -14px rgba(26, 71, 224, 0.55);
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-base), transform var(--transition-base),
    visibility var(--transition-base), background var(--transition-fast);
  z-index: 450;
}

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

.back-to-top:hover {
  background: var(--color-primary-dark);
}

.back-to-top svg {
  width: 18px;
  height: 18px;
}

/* ---------- Footer ---------- */
.site-footer {
  background: var(--color-footer-bg);
  color: rgba(255, 255, 255, 0.78);
  padding: 60px 0 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 1fr 1fr 1.25fr 1.05fr;
  gap: 32px;
  padding-bottom: 44px;
}

.footer-brand .brand-name {
  color: var(--color-white);
}

.footer-brand .brand-mark {
  color: var(--color-white);
}

.footer-brand .brand-tagline {
  color: rgba(255, 255, 255, 0.65);
}

.footer-desc {
  margin: 16px 0 20px;
  font-size: 0.88rem;
  max-width: 250px;
  color: rgba(255, 255, 255, 0.7);
}

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

.social-links a {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-fast), transform var(--transition-fast);
}

.social-links svg {
  width: 15px;
  height: 15px;
}

.social-links a:hover {
  background: rgba(255, 255, 255, 0.28);
  transform: translateY(-3px);
}

.footer-heading {
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.9rem;
  color: var(--color-white);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

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

.footer-links a {
  font-size: 0.88rem;
  color: rgba(255, 255, 255, 0.68);
  transition: color var(--transition-fast), padding-left var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
  padding-left: 4px;
}

.footer-contact li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-bottom: 14px;
  font-size: 0.86rem;
  color: rgba(255, 255, 255, 0.68);
}

.footer-contact svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  margin-top: 3px;
  color: rgba(255, 255, 255, 0.9);
}

.footer-map {
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.footer-map iframe {
  width: 100%;
  height: 100%;
  border: 0;
  display: block;
  filter: grayscale(0.2);
}

.footer-bottom {
  padding: 22px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  text-align: center;
  font-size: 0.84rem;
  color: rgba(255, 255, 255, 0.6);
}

/* ---------- Page header (inner pages) ---------- */
.page-header {
  position: relative;
  padding: 52px 0 44px;
  text-align: center;
  background: var(--color-bg-light);
  overflow: hidden;
}

.page-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 15%, rgba(26, 71, 224, 0.1), transparent 55%);
}

.page-header .container {
  position: relative;
}

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

.breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 14px;
  font-size: 0.86rem;
  color: var(--color-text-muted);
}

.breadcrumb a {
  transition: color var(--transition-fast);
}

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

.breadcrumb svg {
  width: 13px;
  height: 13px;
}

.breadcrumb .is-current {
  color: var(--color-primary);
  font-weight: 600;
}

/* ---------- Misc utility ---------- */
.text-center {
  text-align: center;
}

.mt-lg {
  margin-top: 56px;
}

/* ---------- Scroll reveal (AOS-like) ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}

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

[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;
}

[data-reveal-delay="5"] {
  transition-delay: 0.5s;
}

@media (prefers-reduced-motion: reduce) {
  [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}