/* ============================================================
   Kiet Tran — Personal Website
   Design System & Styles
   ============================================================ */

/* --- Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* --- Custom Properties --- */
:root {
  /* Color */
  --c-bg: #fafaf9;
  --c-bg-alt: #f5f5f4;
  --c-bg-card: #ffffff;
  --c-border: #e7e5e4;
  --c-border-light: #f0eeec;
  --c-text: #1c1917;
  --c-text-secondary: #57534e;
  --c-text-muted: #a8a29e;
  --c-accent: #0d7377;
  --c-accent-light: #e6f3f3;
  --c-accent-hover: #0a5c5f;
  --c-tag-bg: #f5f5f4;
  --c-tag-border: #e7e5e4;
  --c-tag-text: #44403c;
  --c-nav-bg: rgba(250, 250, 249, 0.85);

  /* Typography */
  --f-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --f-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Sizing */
  --w-max: 720px;
  --w-wide: 960px;

  /* Spacing scale */
  --s-xs: 0.25rem;
  --s-sm: 0.5rem;
  --s-md: 1rem;
  --s-lg: 1.5rem;
  --s-xl: 2rem;
  --s-2xl: 3rem;
  --s-3xl: 4rem;
  --s-4xl: 6rem;

  /* Radius */
  --r-sm: 4px;
  --r-md: 6px;
  --r-lg: 8px;

  /* Transitions */
  --t-fast: 150ms ease;
  --t-normal: 250ms ease;
}

[data-theme="dark"] {
  --c-bg: #111827;
  --c-bg-alt: #1f2937;
  --c-bg-card: #1f2937;
  --c-border: #374151;
  --c-border-light: #4b5563;
  --c-text: #f9fafb;
  --c-text-secondary: #d1d5db;
  --c-text-muted: #9ca3af;
  --c-accent: #2dd4bf;
  --c-accent-light: rgba(45, 212, 191, 0.1);
  --c-accent-hover: #14b8a6;
  --c-accent-hover: #14b8a6;
  --c-tag-bg: #374151;
  --c-tag-border: #4b5563;
  --c-tag-text: #e5e7eb;
  --c-nav-bg: rgba(17, 24, 39, 0.85);
}

/* --- Reset --- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

html, body {
  overflow-x: hidden;
}

body {
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color var(--t-normal), color var(--t-normal);
}

img { max-width: 100%; display: block; }
a { color: var(--c-accent); text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-accent-hover); }
a:focus-visible { outline: 2px solid var(--c-accent); outline-offset: 2px; border-radius: 2px; }

ul, ol { list-style: none; }

/* --- Layout --- */
.container {
  max-width: var(--w-max);
  margin: 0 auto;
  padding: 0 var(--s-lg);
}

.container--wide {
  max-width: var(--w-wide);
}

section {
  padding: var(--s-4xl) 0;
}

/* --- Section Headers --- */
.section-label {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-sm);
}

.section-title {
  font-size: 1.5rem;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--c-text);
  margin-bottom: var(--s-lg);
}

.section-divider {
  width: 100%;
  height: 1px;
  background: var(--c-border);
  border: none;
  margin: 0;
}

/* ============================================================
   NAVIGATION
   ============================================================ */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--c-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-border-light);
  transition: background var(--t-normal), box-shadow var(--t-normal);
}

.nav.scrolled {
  box-shadow: 0 1px 3px rgba(0,0,0,0.04);
}

.nav__inner {
  max-width: var(--w-wide);
  margin: 0 auto;
  padding: 0 var(--s-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.nav__brand {
  font-weight: 600;
  font-size: 1rem;
  color: var(--c-text);
  letter-spacing: -0.01em;
  text-decoration: none;
}

.nav__brand:hover { color: var(--c-text); }

.nav__links {
  display: flex;
  gap: var(--s-lg);
  align-items: center;
}

.nav__link {
  font-size: 0.875rem;
  font-weight: 450;
  color: var(--c-text-secondary);
  text-decoration: none;
  transition: color var(--t-fast);
  padding: var(--s-xs) 0;
}

.nav__link:hover {
  color: var(--c-text);
}

/* Mobile menu toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--s-sm);
  margin-right: calc(-1 * var(--s-sm));
  color: var(--c-text);
}

.nav__toggle svg {
  width: 20px;
  height: 20px;
  display: block;
}

.nav__toggle .icon-close { display: none; }
.nav__toggle[aria-expanded="true"] .icon-open { display: none; }
.nav__toggle[aria-expanded="true"] .icon-close { display: block; }

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--c-text-secondary);
  padding: var(--s-xs);
  transition: color var(--t-fast);
  display: flex;
  align-items: center;
}

.theme-toggle:hover {
  color: var(--c-text);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav__toggle { display: block; }
  
  .nav__links {
    position: fixed;
    top: 56px;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(250, 250, 249, 0.98);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    flex-direction: column;
    padding: var(--s-xl) var(--s-lg);
    gap: var(--s-xs);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform 300ms ease, opacity 200ms ease;
  }

  .nav__links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__link {
    font-size: 1.125rem;
    padding: var(--s-sm) 0;
    width: 100%;
  }
}

/* ============================================================
   HERO
   ============================================================ */
.hero {
  padding-top: calc(56px + var(--s-4xl));
  padding-bottom: var(--s-3xl);
}

.hero__meta {
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--c-text-muted);
  margin-bottom: var(--s-lg);
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  flex-wrap: wrap;
}

.hero__meta-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-accent);
  flex-shrink: 0;
}

.hero__name {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--c-text);
  margin-bottom: var(--s-md);
}

.hero__title {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 400;
  line-height: 1.5;
  color: var(--c-text-secondary);
  max-width: 540px;
  margin-bottom: var(--s-xl);
}

.hero__intro {
  font-size: 1rem;
  line-height: 1.75;
  color: var(--c-text-secondary);
  max-width: 560px;
}

.hero__tags {
  display: flex;
  gap: var(--s-sm);
  flex-wrap: wrap;
  margin-top: var(--s-xl);
}

.hero__tag {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  font-weight: 400;
  color: var(--c-text-muted);
  padding: 0.3em 0.7em;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
}

/* ============================================================
   ABOUT
   ============================================================ */
.about__content {
  display: grid;
  gap: var(--s-lg);
}

.about__text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-text-secondary);
}

.about__text strong {
  color: var(--c-text);
  font-weight: 500;
}

.about__aside {
  margin-top: var(--s-md);
  padding: var(--s-lg);
  background: var(--c-bg-alt);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border-light);
}

.about__aside-label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-sm);
}

.about__aside-text {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
  font-style: italic;
}

/* ============================================================
   EXPERIENCE
   ============================================================ */
.experience__current {
  padding: var(--s-xl);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  margin-bottom: var(--s-2xl);
}

.experience__role {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-xs);
}

.experience__company {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  margin-bottom: var(--s-md);
}

.experience__desc {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--c-text-secondary);
}

/* Timeline */
.timeline {
  position: relative;
  padding-left: var(--s-xl);
}

.timeline::before {
  content: '';
  position: absolute;
  left: 3px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: var(--c-border);
}

.timeline__item {
  position: relative;
  padding-bottom: var(--s-xl);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--s-xl) + 0px);
  top: 8px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--c-border);
  border: 2px solid var(--c-bg);
}

.timeline__item--active::before {
  background: var(--c-accent);
}

.timeline__year {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  color: var(--c-text-muted);
  margin-bottom: var(--s-xs);
}

.timeline__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-xs);
}

.timeline__text {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
}

/* ============================================================
   SKILLS
   ============================================================ */
.skills__grid {
  display: grid;
  gap: var(--s-lg);
}

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

.skill-group {
  padding: var(--s-lg);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
}

.skill-group__title {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-text);
  margin-bottom: var(--s-md);
  display: flex;
  align-items: center;
  gap: var(--s-sm);
}

.skill-group__level {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 400;
  color: var(--c-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.skill-group__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-sm);
}

.skill-tag {
  font-family: var(--f-mono);
  font-size: 0.75rem;
  padding: 0.35em 0.65em;
  background: var(--c-tag-bg);
  border: 1px solid var(--c-tag-border);
  border-radius: var(--r-sm);
  color: var(--c-tag-text);
  white-space: nowrap;
  display: inline-flex;
  align-items: center;
  gap: 0.35em;
}

.skill-tag i {
  font-size: 1.1em;
}

/* ============================================================
   INFRASTRUCTURE
   ============================================================ */
.infra__text {
  font-size: 1rem;
  line-height: 1.8;
  color: var(--c-text-secondary);
  margin-bottom: var(--s-xl);
}

.infra__diagram {
  padding: var(--s-xl);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  margin-bottom: var(--s-xl);
  overflow-x: auto;
}

.infra__diagram-title {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-lg);
}

.arch-flow {
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 0.8125rem;
}

.arch-node {
  padding: 0.5em 0.85em;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text);
  white-space: nowrap;
}

.arch-node--accent {
  background: var(--c-accent-light);
  border-color: var(--c-accent);
  color: var(--c-accent);
}

.arch-arrow {
  color: var(--c-text-muted);
  font-size: 0.875rem;
  flex-shrink: 0;
}

/* Troubleshooting approach */
.approach {
  padding: var(--s-lg);
  background: var(--c-bg-alt);
  border-radius: var(--r-lg);
  border: 1px solid var(--c-border-light);
}

.approach__title {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-md);
}

.approach__flow {
  display: flex;
  align-items: center;
  gap: var(--s-sm);
  flex-wrap: wrap;
  font-family: var(--f-mono);
  font-size: 0.8125rem;
}

.approach__step {
  color: var(--c-text);
  font-weight: 500;
}

.approach__sep {
  color: var(--c-text-muted);
}

/* Issues list */
.infra__issues {
  margin-top: var(--s-xl);
}

.infra__issues-title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-md);
}

.issue-grid {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-sm);
}

.issue-tag {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  padding: 0.3em 0.6em;
  background: var(--c-bg-alt);
  border: 1px solid var(--c-border);
  border-radius: var(--r-sm);
  color: var(--c-text-secondary);
}

/* ============================================================
   PROJECTS
   ============================================================ */
.projects__grid {
  display: grid;
  gap: var(--s-xl);
}

.project-card {
  padding: var(--s-xl);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  transition: border-color var(--t-normal), box-shadow var(--t-normal);
}

.project-card:hover {
  border-color: var(--c-border);
  box-shadow: 0 2px 8px rgba(0,0,0,0.04);
}

.project-card__label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-sm);
}

.project-card__title {
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-sm);
}

.project-card__desc {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
  margin-bottom: var(--s-lg);
}

.project-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s-sm);
  margin-bottom: var(--s-lg);
}

.project-card__learned {
  padding-top: var(--s-md);
  border-top: 1px solid var(--c-border-light);
}

.project-card__learned-title {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--c-text-muted);
  text-transform: uppercase;
  margin-bottom: var(--s-sm);
}

.project-card__learned-text {
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
}

/* ============================================================
   JOURNEY
   ============================================================ */
.journey__track {
  display: grid;
  gap: var(--s-lg);
}

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

.journey-phase {
  padding: var(--s-lg);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
}

.journey-phase__label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
  margin-bottom: var(--s-sm);
}

.journey-phase__title {
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-md);
}

.journey-phase__items {
  display: flex;
  flex-direction: column;
  gap: var(--s-xs);
}

.journey-phase__item {
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--c-text-secondary);
  padding: 0.25em 0;
}

.journey-phase--active {
  border-color: var(--c-accent);
  background: linear-gradient(135deg, var(--c-bg-card), var(--c-accent-light));
}

.journey-phase--active .journey-phase__label {
  color: var(--c-accent);
}

/* ============================================================
   PHILOSOPHY
   ============================================================ */
.philosophy {
  padding: var(--s-3xl) 0;
}

.philosophy__quote {
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 500;
  line-height: 1.6;
  color: var(--c-text);
  letter-spacing: -0.01em;
  position: relative;
  padding-left: var(--s-lg);
  border-left: 2px solid var(--c-accent);
}

.philosophy__sub {
  font-size: 0.875rem;
  color: var(--c-text-muted);
  margin-top: var(--s-md);
  padding-left: var(--s-lg);
}

/* ============================================================
   EDUCATION
   ============================================================ */
.education__card {
  padding: var(--s-xl);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
}

.education__degree {
  font-size: 1rem;
  font-weight: 600;
  color: var(--c-text);
  margin-bottom: var(--s-xs);
}

.education__school {
  font-size: 0.9375rem;
  color: var(--c-text-secondary);
  margin-bottom: var(--s-md);
}

.education__details {
  display: flex;
  gap: var(--s-xl);
  flex-wrap: wrap;
}

.education__detail {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.education__detail-label {
  font-family: var(--f-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-text-muted);
}

.education__detail-value {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--c-text);
}

.education__note {
  margin-top: var(--s-lg);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact__intro {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--c-text-secondary);
  margin-bottom: var(--s-xl);
  max-width: 480px;
}

.contact__methods {
  display: flex;
  flex-direction: column;
  gap: var(--s-md);
}

.contact__method {
  display: inline-flex;
  align-items: center;
  gap: var(--s-sm);
  font-size: 0.9375rem;
  color: var(--c-text);
  text-decoration: none;
  padding: var(--s-sm) var(--s-md);
  background: var(--c-bg-card);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
  transition: border-color var(--t-fast), background var(--t-fast);
  width: fit-content;
}

.contact__method:hover {
  border-color: var(--c-accent);
  background: var(--c-accent-light);
  color: var(--c-accent);
}

.contact__method svg {
  width: 16px;
  height: 16px;
  flex-shrink: 0;
  opacity: 0.6;
}

/* ============================================================
   FOOTER
   ============================================================ */
.footer {
  padding: var(--s-2xl) 0;
  border-top: 1px solid var(--c-border);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--s-md);
}

.footer__copy {
  font-size: 0.8125rem;
  color: var(--c-text-muted);
}

.footer__note {
  font-size: 0.75rem;
  color: var(--c-text-muted);
  font-family: var(--f-mono);
}

/* ============================================================
   ANIMATIONS (subtle)
   ============================================================ */
.fade-in {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 600ms ease, transform 600ms ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* stagger children */
.fade-in-group > .fade-in:nth-child(1) { transition-delay: 0ms; }
.fade-in-group > .fade-in:nth-child(2) { transition-delay: 80ms; }
.fade-in-group > .fade-in:nth-child(3) { transition-delay: 160ms; }
.fade-in-group > .fade-in:nth-child(4) { transition-delay: 240ms; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  section {
    padding: var(--s-3xl) 0;
  }

  .hero {
    padding-top: calc(56px + var(--s-3xl));
  }

  .section-title {
    font-size: 1.3rem;
  }

  .experience__current {
    padding: var(--s-lg);
  }

  .project-card {
    padding: var(--s-lg);
  }

  .skill-group {
    padding: var(--s-md);
  }

  .infra__diagram {
    padding: var(--s-lg);
  }
}

@media (max-width: 480px) {
  :root {
    --s-lg: 1.25rem;
    --s-xl: 1.5rem;
    --s-2xl: 2rem;
    --s-3xl: 2.5rem;
    --s-4xl: 3.5rem;
  }

  body {
    font-size: 15px;
  }

  .container {
    padding: 0 var(--s-md);
  }

  .hero__name {
    font-size: 1.75rem;
  }

  .hero__tags {
    gap: 0.375rem;
  }

  .arch-flow {
    font-size: 0.75rem;
  }

  .arch-node {
    padding: 0.4em 0.65em;
  }

  .footer__inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .education__details {
    gap: var(--s-md);
  }
}

/* ============================================================
   SKIP LINK
   ============================================================ */
.skip-link {
  position: absolute;
  top: -100px;
  left: var(--s-md);
  padding: var(--s-sm) var(--s-md);
  background: var(--c-text);
  color: var(--c-bg);
  font-size: 0.875rem;
  border-radius: var(--r-sm);
  z-index: 200;
  transition: top var(--t-fast);
}

.skip-link:focus {
  top: var(--s-md);
  color: var(--c-bg);
}

/* Print styles */
@media print {
  .nav, .skip-link, .zalo-float { display: none; }
  section { padding: 1rem 0; }
  body { font-size: 12pt; }
  a { color: var(--c-text); }
}

/* ============================================================
   ZALO FLOATING BUTTON
   ============================================================ */
.zalo-float {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 60px;
  height: 60px;
  background-color: #0068FF;
  color: white;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: Arial, sans-serif;
  font-weight: bold;
  font-size: 16px;
  box-shadow: 0 4px 12px rgba(0, 104, 255, 0.4);
  z-index: 99999;
  text-decoration: none;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  animation: zalo-pulse 2s infinite;
}

.zalo-float:hover {
  background-color: #0052cc;
  transform: scale(1.1);
  color: white;
}

@keyframes zalo-pulse {
  0% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0.7); }
  70% { box-shadow: 0 0 0 15px rgba(0, 104, 255, 0); }
  100% { box-shadow: 0 0 0 0 rgba(0, 104, 255, 0); }
}