/* sections.css — Style cho từng section + header/footer/nav */

/* ===== Header / Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(10, 31, 68, 0.85);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  color: var(--color-text-on-dark);
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-block: 0.85rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  color: inherit;
  font-weight: var(--weight-bold);
  font-size: var(--text-lg);
  letter-spacing: var(--tracking-tight);
}

.brand__mark {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  background: linear-gradient(135deg, var(--color-gold-400), var(--color-gold-500));
  color: var(--color-navy-900);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: var(--weight-bold);
  font-size: 1.1rem;
}

.brand:hover,
.brand:focus-visible {
  color: var(--color-gold-400);
}

.nav {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.nav__link {
  padding: 0.55rem 0.9rem;
  border-radius: var(--radius-pill);
  color: var(--color-text-on-dark-muted);
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  transition: color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

.nav__link:hover,
.nav__link:focus-visible,
.nav__link.is-active {
  color: var(--color-text-on-dark);
  background: rgba(255, 255, 255, 0.08);
}

.nav__cta {
  margin-left: var(--space-3);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  color: var(--color-text-on-dark);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  align-items: center;
  justify-content: center;
}

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

@media (max-width: 880px) {
  .nav {
    position: fixed;
    inset: 64px 0 auto 0;
    background: var(--color-navy-900);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-4) var(--space-container) var(--space-6);
    transform: translateY(-110%);
    transition: transform var(--duration-normal) var(--ease-out-expo);
    box-shadow: var(--shadow-lg);
  }

  .nav.is-open {
    transform: translateY(0);
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .nav__link {
    padding: var(--space-4) var(--space-3);
    border-radius: 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
    font-size: var(--text-base);
  }

  .nav__cta {
    margin: var(--space-4) 0 0;
    align-self: stretch;
    justify-content: center;
  }

  .nav-toggle {
    display: inline-flex;
  }
}

/* ===== Hero ===== */
.hero {
  position: relative;
  background:
    radial-gradient(
      ellipse 60% 50% at 100% 0%,
      rgba(245, 180, 0, 0.14),
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 40% at 0% 100%,
      rgba(46, 102, 184, 0.22),
      transparent 60%
    ),
    linear-gradient(180deg, var(--color-navy-900), var(--color-navy-950));
  color: var(--color-text-on-dark);
  overflow: hidden;
  padding-block: clamp(3rem, 2rem + 3vw, 5.5rem);
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  pointer-events: none;
  z-index: 0;
}

.hero::before {
  width: 320px;
  height: 320px;
  right: -120px;
  top: -120px;
  background: radial-gradient(
    circle,
    rgba(245, 180, 0, 0.12),
    transparent 70%
  );
}

.hero::after {
  width: 420px;
  height: 420px;
  left: -180px;
  bottom: -180px;
  background: radial-gradient(
    circle,
    rgba(74, 128, 216, 0.18),
    transparent 70%
  );
}

.hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(2rem, 2vw + 1rem, 3.5rem);
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 900px) {
  .hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
}

.hero__eyebrow {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  font-size: var(--text-sm);
  font-weight: var(--weight-semibold);
  color: var(--color-gold-400);
  margin-bottom: var(--space-5);
  position: relative;
  padding-left: 2.5rem;
}

.hero__eyebrow::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 2rem;
  height: 2px;
  background: var(--color-gold-400);
  transform: translateY(-50%);
}

.hero__title {
  font-size: clamp(1.875rem, 1.4rem + 1.8vw, 2.75rem);
  line-height: 1.1;
  font-weight: var(--weight-bold);
  letter-spacing: var(--tracking-tight);
  margin-bottom: var(--space-4);
  color: var(--color-text-on-dark);
}

.hero__title span {
  display: block;
}

.hero__title .is-gold {
  color: var(--color-gold-500);
}

.hero__tagline {
  font-size: var(--text-lg);
  color: var(--color-text-on-dark-muted);
  margin-bottom: var(--space-6);
  max-width: 52ch;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}

.hero__cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.hero__author {
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.hero__author-name {
  font-size: clamp(1.625rem, 1.2rem + 1.2vw, 2.125rem);
  color: var(--color-gold-400);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-3);
  letter-spacing: var(--tracking-tight);
}

.hero__author-meta {
  font-size: clamp(1rem, 0.92rem + 0.3vw, 1.125rem);
  color: var(--color-text-on-dark);
  font-weight: var(--weight-medium);
  margin-bottom: var(--space-5);
  line-height: var(--leading-snug);
  letter-spacing: 0.005em;
}

.hero__phone {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.75rem 1.25rem;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-pill);
  color: var(--color-text-on-dark);
  font-weight: var(--weight-semibold);
  font-size: var(--text-lg);
  transition: background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.hero__phone:hover,
.hero__phone:focus-visible {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-gold-400);
  color: var(--color-text-on-dark);
}

.hero__phone svg {
  width: 18px;
  height: 18px;
  color: var(--color-gold-400);
}

/* Hero — right column */
.hero__visual {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.hero__portrait {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--color-bg);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 1 / 1;
  max-width: 460px;
  width: 100%;
  margin-inline: auto;
}

.hero__portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__portrait::after {
  content: "";
  position: absolute;
  inset: 0;
  border: 6px solid rgba(255, 255, 255, 0.5);
  border-radius: inherit;
  pointer-events: none;
}

.hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
}

.hero__stats--2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.hero__badges {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
}

@media (max-width: 520px) {
  .hero__badges {
    grid-template-columns: 1fr;
  }
}

/* ===== About ===== */
.about__grid {
  display: grid;
  gap: clamp(2rem, 2vw + 1rem, 3.5rem);
  grid-template-columns: 1fr;
  align-items: center;
}

@media (min-width: 900px) {
  .about__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
  }
}

.about__visual {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 480px;
  width: 100%;
  margin-inline: auto;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  background: var(--color-bg);
}

.about__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.about__visual::before {
  content: "";
  position: absolute;
  inset: -1px;
  border: 1px solid rgba(10, 31, 68, 0.06);
  border-radius: inherit;
  pointer-events: none;
}

.about__deco {
  position: absolute;
  inset: -24px -24px auto auto;
  width: 140px;
  height: 140px;
  border-radius: var(--radius-xl);
  background: linear-gradient(135deg, var(--color-gold-400), var(--color-gold-500));
  z-index: -1;
  opacity: 0.6;
}

.about__intro {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.about__certs {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}

.about__cert {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
}

.about__cert-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--color-navy-900);
  color: var(--color-gold-400);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.about__cert-icon svg {
  width: 16px;
  height: 16px;
}

.about__cert-title {
  font-weight: var(--weight-semibold);
  font-size: var(--text-base);
  margin-bottom: 2px;
}

.about__cert-meta {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ===== Services ===== */
.services__grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
}

@media (min-width: 640px) {
  .services__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 992px) {
  .services__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ===== Process ===== */
.process__steps {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: 1fr;
  position: relative;
}

@media (min-width: 768px) {
  .process__steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .process__steps::before {
    content: "";
    position: absolute;
    top: 40px;
    left: 8%;
    right: 8%;
    height: 2px;
    background: repeating-linear-gradient(
      90deg,
      rgba(245, 180, 0, 0.6) 0 8px,
      transparent 8px 16px
    );
    z-index: 0;
  }
}

.process__step {
  position: relative;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  z-index: 1;
}

.process__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-navy-700), var(--color-navy-900));
  color: var(--color-gold-400);
  font-weight: var(--weight-bold);
  font-size: var(--text-xl);
  margin-bottom: var(--space-4);
  box-shadow: var(--shadow-sm);
  border: 4px solid var(--color-bg);
}

.process__title {
  font-size: var(--text-lg);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-2);
  color: var(--color-navy-900);
}

.process__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: var(--leading-relaxed);
  margin: 0;
}

/* ===== Contact ===== */
.contact__grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
  align-items: start;
}

@media (min-width: 900px) {
  .contact__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  }
}

.contact-form {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: clamp(1.5rem, 1rem + 1.5vw, 2.5rem);
  display: grid;
  gap: var(--space-4);
  box-shadow: var(--shadow-sm);
}

.contact-form__row {
  display: grid;
  gap: var(--space-4);
}

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

.contact-form__notice {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  background: linear-gradient(
    180deg,
    rgba(245, 180, 0, 0.10),
    rgba(245, 180, 0, 0.04)
  );
  border: 1px solid rgba(245, 180, 0, 0.45);
  border-left-width: 4px;
  border-radius: var(--radius-md);
  margin-top: var(--space-2);
}

.contact-form__notice-icon {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: var(--color-gold-500);
  color: var(--color-navy-900);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.contact-form__notice-icon svg {
  width: 20px;
  height: 20px;
}

.contact-form__notice-title {
  display: block;
  font-size: var(--text-base);
  font-weight: var(--weight-bold);
  color: var(--color-navy-900);
  margin-bottom: var(--space-1);
  letter-spacing: var(--tracking-tight);
}

.contact-form__notice-text {
  font-size: var(--text-sm);
  color: var(--color-text);
  line-height: var(--leading-relaxed);
  margin: 0;
}

.contact-form__notice-text em {
  font-style: normal;
  font-weight: var(--weight-semibold);
  color: var(--color-navy-900);
}

.contact-form__notice-text strong {
  color: var(--color-navy-900);
}

.contact-form__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-2);
}

.contact-form__status {
  font-size: var(--text-sm);
  color: var(--color-success);
  min-height: 1rem;
}

.contact-info {
  display: grid;
  gap: var(--space-4);
  align-content: start;
}

.contact-info__title {
  font-size: var(--text-xl);
  margin-bottom: var(--space-2);
}

.contact-info__item {
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out);
}

a.contact-info__item:hover,
a.contact-info__item:focus-visible {
  border-color: var(--color-navy-700);
  background: var(--color-bg);
}

.contact-info__icon {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-navy-900);
  color: var(--color-gold-400);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.contact-info__icon svg {
  width: 20px;
  height: 20px;
}

.contact-info__label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--tracking-wide);
  color: var(--color-text-soft);
  margin-bottom: 2px;
  font-weight: var(--weight-semibold);
}

.contact-info__value {
  font-weight: var(--weight-semibold);
  color: var(--color-text);
  word-break: break-word;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-navy-950);
  color: var(--color-text-on-dark-muted);
  padding-block: var(--space-12) var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.site-footer__grid {
  display: grid;
  gap: var(--space-8);
  grid-template-columns: 1fr;
  margin-bottom: var(--space-10);
}

@media (min-width: 768px) {
  .site-footer__grid {
    grid-template-columns: 1.4fr 1fr 1.2fr;
  }
}

.site-footer__brand {
  color: var(--color-text-on-dark);
  font-size: var(--text-xl);
  font-weight: var(--weight-bold);
  margin-bottom: var(--space-3);
}

.site-footer__desc {
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
}

.site-footer__col-title {
  color: var(--color-text-on-dark);
  font-size: var(--text-base);
  font-weight: var(--weight-semibold);
  margin-bottom: var(--space-4);
}

.site-footer__links {
  display: grid;
  gap: var(--space-2);
}

.site-footer__link {
  color: var(--color-text-on-dark-muted);
  font-size: var(--text-sm);
  transition: color var(--duration-fast) var(--ease-out);
}

.site-footer__link:hover,
.site-footer__link:focus-visible {
  color: var(--color-gold-400);
}

.site-footer__bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding-top: var(--space-6);
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: var(--text-xs);
}

.site-footer__socials {
  display: flex;
  gap: var(--space-2);
}

.site-footer__social {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  color: var(--color-text-on-dark-muted);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--duration-fast) var(--ease-out),
    background-color var(--duration-fast) var(--ease-out),
    border-color var(--duration-fast) var(--ease-out);
}

.site-footer__social:hover,
.site-footer__social:focus-visible {
  color: var(--color-gold-400);
  background: rgba(245, 180, 0, 0.12);
  border-color: rgba(245, 180, 0, 0.32);
}

.site-footer__social svg {
  width: 16px;
  height: 16px;
}