/* Vinh Tí — Dịch vụ Tin học Đà Nẵng */
:root {
  --color-bg: #f0f7fb;
  --color-surface: #ffffff;
  --color-primary: #0d6e8d;
  --color-primary-dark: #0a5569;
  --color-accent: #2ec4b6;
  --color-accent-soft: rgba(46, 196, 182, 0.12);
  --color-text: #1a2b33;
  --color-muted: #5a6f7a;
  --shadow-sm: 0 2px 8px rgba(13, 110, 141, 0.08);
  --shadow-md: 0 8px 24px rgba(13, 110, 141, 0.12);
  --radius: 12px;
  --font: "Inter", "Roboto", system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
}

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

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  gap: 1rem;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color-primary);
  text-decoration: none;
}

.logo:hover {
  text-decoration: none;
  color: var(--color-primary-dark);
}

.logo__mark {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 0.85rem;
  font-weight: 800;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  align-items: center;
}

.nav a {
  color: var(--color-text);
  font-weight: 500;
  padding: 0.35rem 0;
}

.nav a:hover,
.nav a.is-active {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 2px solid var(--color-accent);
}

/* Hero */
.hero {
  background: linear-gradient(160deg, #e8f4f8 0%, #d4eef0 45%, #c5e8e4 100%);
  padding: 2.5rem 0 3rem;
  border-bottom: 1px solid rgba(13, 110, 141, 0.1);
}

.hero__title {
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 1rem;
  color: var(--color-primary-dark);
}

.hero__desc {
  font-size: 1.05rem;
  color: var(--color-muted);
  max-width: 640px;
  margin: 0 0 1.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 48px;
  padding: 0 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 1rem;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.btn:hover {
  text-decoration: none;
  transform: translateY(-1px);
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-md);
}

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

.btn--zalo {
  background: #0068ff;
  color: #fff;
  box-shadow: var(--shadow-md);
}

.btn--zalo:hover {
  background: #0056d6;
  color: #fff;
}

.btn--outline {
  background: var(--color-surface);
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-accent-soft);
}

/* Sections */
.section {
  padding: 2.5rem 0;
}

.section__title {
  font-size: 1.5rem;
  font-weight: 800;
  margin: 0 0 1.25rem;
  color: var(--color-primary-dark);
}

/* Cards grid */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.card {
  background: var(--color-surface);
  border-radius: var(--radius);
  padding: 1.25rem 1.35rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(13, 110, 141, 0.08);
  transition: box-shadow 0.2s ease;
}

.card--service {
  padding: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card__thumb {
  aspect-ratio: 16 / 9;
  background: linear-gradient(145deg, #e8f4f8, #d4eef0);
  overflow: hidden;
}

.card__thumb-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.card__body {
  padding: 1.15rem 1.35rem 1.35rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.card:hover {
  box-shadow: var(--shadow-md);
}

.card__icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
}

.card__title {
  font-weight: 700;
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
}

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

/* Reasons list */
.reasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.75rem;
}

.reasons li {
  background: var(--color-surface);
  padding: 1rem 1.15rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  border-left: 4px solid var(--color-accent);
}

/* Area box */
.area-box {
  background: linear-gradient(135deg, var(--color-accent-soft), #fff);
  border: 1px solid rgba(46, 196, 182, 0.25);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
}

.area-box p {
  margin: 0;
  font-size: 1.05rem;
}

/* CTA strip */
.cta-strip {
  background: linear-gradient(135deg, var(--color-primary), var(--color-primary-dark));
  color: #fff;
  padding: 2rem 0;
  text-align: center;
}

.cta-strip h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
}

.cta-strip .cta-row {
  justify-content: center;
}

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

.cta-strip .btn--primary:hover {
  background: #e8f4f8;
}

.cta-strip .btn--zalo {
  background: #fff;
  color: #0068ff;
}

.cta-strip .btn--zalo:hover {
  background: #e8f0ff;
}

/* Footer */
.site-footer {
  background: #0d3d4d;
  color: #c5dde5;
  padding: 2rem 0 1.5rem;
  font-size: 0.9rem;
}

.site-footer a {
  color: #8ec9d9;
}

.site-footer a:hover {
  color: #fff;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1.2fr 1fr;
  }
}

.footer-brand {
  font-weight: 700;
  color: #fff;
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}

.footer-links {
  list-style: none;
  margin: 0;
  padding: 0;
}

.footer-links li {
  margin-bottom: 0.35rem;
}

.copyright {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.85rem;
  color: #8aa8b3;
}

/* Blog list */
.page-header {
  padding: 2rem 0 1rem;
}

.page-header h1 {
  margin: 0 0 0.5rem;
  font-size: 1.75rem;
  color: var(--color-primary-dark);
}

.page-header p {
  margin: 0;
  color: var(--color-muted);
}

.blog-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.blog-card__img {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(135deg, #c5e8e4, #a8d4e0);
}

.blog-card .card {
  border-radius: 0 0 var(--radius) var(--radius);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.blog-card__title {
  font-size: 1.1rem;
  margin: 0 0 0.5rem;
}

.blog-card__title a {
  color: inherit;
}

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

.blog-card__excerpt {
  flex: 1;
  margin: 0 0 1rem;
  font-size: 0.95rem;
  color: var(--color-muted);
}

.blog-card .btn {
  align-self: flex-start;
}

/* Article */
.article {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 0 3rem;
}

.article h1 {
  font-size: 1.75rem;
  color: var(--color-primary-dark);
  margin: 0 0 1rem;
}

.article-meta {
  color: var(--color-muted);
  font-size: 0.9rem;
  margin-bottom: 1.5rem;
}

.article-body {
  background: var(--color-surface);
  padding: 1.75rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.article-body h2 {
  font-size: 1.25rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--color-primary-dark);
}

.article-body h2:first-child {
  margin-top: 0;
}

.article-body p {
  margin: 0 0 1rem;
}

.article-body ul,
.article-body ol {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
}

.article-body li {
  margin-bottom: 0.35rem;
}

.article-figure {
  margin: 1.25rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.article-figure figcaption {
  font-size: 0.85rem;
  color: var(--color-muted);
  padding: 0.5rem 0 0;
}

/* Contact */
.contact-grid {
  display: grid;
  gap: 1.5rem;
}

@media (min-width: 768px) {
  .contact-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }
}

.contact-card {
  background: var(--color-surface);
  padding: 1.5rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.contact-card h2 {
  margin: 0 0 1rem;
  font-size: 1.2rem;
  color: var(--color-primary-dark);
}

.contact-card dl {
  margin: 0;
}

.contact-card dt {
  font-weight: 600;
  margin-top: 0.75rem;
}

.contact-card dt:first-child {
  margin-top: 0;
}

.contact-card dd {
  margin: 0.25rem 0 0;
  color: var(--color-muted);
}

.map-wrap {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  margin-top: 1rem;
}

.map-wrap iframe {
  display: block;
  width: 100%;
  height: 300px;
  border: 0;
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}