/* AIzalo.com / Zalo-Flow Community Portal — Pure High-Performance Modern CSS */
:root {
  --bg-main: #070a13;
  --bg-card: rgba(15, 23, 42, 0.75);
  --bg-card-hover: rgba(22, 35, 64, 0.85);
  --border-subtle: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(0, 153, 255, 0.35);
  --primary: #0084ff;
  --primary-hover: #0070db;
  --primary-glow: rgba(0, 132, 255, 0.25);
  --cyan: #00d2ff;
  --text-main: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --success: #10b981;
  --warning: #f59e0b;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

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

html {
  scroll-behavior: smooth;
  font-family: var(--font-sans);
  background-color: var(--bg-main);
  color: var(--text-main);
  line-height: 1.6;
}

body {
  overflow-x: hidden;
  background: radial-gradient(circle at 50% 0%, #0f1d3a 0%, #070a13 55%, #05070d 100%);
  min-height: 100vh;
}

/* Container */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  background: rgba(7, 10, 19, 0.82);
  border-bottom: 1px solid var(--border-subtle);
  transition: all 0.3s ease;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4.25rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: #fff;
  font-weight: 800;
  font-size: 1.35rem;
}

.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
}

.brand-tag {
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: 6px;
  background: rgba(0, 132, 255, 0.15);
  color: var(--cyan);
  border: 1px solid rgba(0, 210, 255, 0.3);
  margin-left: 0.25rem;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
}

.nav-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s ease;
}

.nav-link:hover {
  color: var(--cyan);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.65rem 1.25rem;
  border-radius: 10px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  cursor: pointer;
  border: 1px solid transparent;
}

.btn-primary {
  background: linear-gradient(135deg, #0084ff 0%, #0056d6 100%);
  color: #fff;
  box-shadow: 0 4px 18px var(--primary-glow);
}

.btn-primary:hover {
  background: linear-gradient(135deg, #0094ff 0%, #0066f6 100%);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(0, 132, 255, 0.4);
}

.btn-zalo {
  background: linear-gradient(135deg, #0068ff 0%, #004ecc 100%);
  color: #fff;
  border: 1px solid rgba(0, 210, 255, 0.35);
}

.btn-zalo:hover {
  background: linear-gradient(135deg, #0078ff 0%, #005ae6 100%);
  transform: translateY(-2px);
}

.btn-secondary {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-main);
  border: 1px solid var(--border-subtle);
}

.btn-secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.btn-lg {
  padding: 0.85rem 1.75rem;
  font-size: 1.05rem;
}

/* Hero Section */
.hero {
  padding: 4.5rem 0 3rem;
  text-align: center;
  position: relative;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 1rem;
  border-radius: 9999px;
  background: rgba(0, 132, 255, 0.1);
  border: 1px solid rgba(0, 210, 255, 0.3);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--cyan);
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 900;
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: #fff;
}

.gradient-text {
  background: linear-gradient(135deg, #00d2ff 0%, #0084ff 50%, #9d4edd 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-desc {
  max-width: 780px;
  margin: 0 auto 2rem;
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  color: var(--text-muted);
  line-height: 1.65;
}

.hero-cta-group {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.cli-snippet {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 0.75rem 1.25rem;
  border-radius: 10px;
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: #38bdf8;
  cursor: pointer;
  transition: border-color 0.2s ease;
}

.cli-snippet:hover {
  border-color: var(--cyan);
}

.badges-bar {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: 1.25rem;
  padding: 1.25rem 0;
  color: var(--text-dim);
  font-size: 0.85rem;
}

.badge-item {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

/* SmartScreen Box */
.smartscreen-alert {
  max-width: 820px;
  margin: 1.5rem auto 3rem;
  background: rgba(2, 132, 199, 0.08);
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 14px;
  padding: 1.25rem 1.5rem;
  text-align: left;
}

.smartscreen-header {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: #38bdf8;
  font-weight: 700;
  font-size: 1rem;
  margin-bottom: 0.5rem;
}

.smartscreen-content {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.smartscreen-content code {
  font-family: var(--font-mono);
  background: rgba(0, 0, 0, 0.35);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  color: #f1f5f9;
}

/* GEO Quotable Box */
.geo-box {
  max-width: 820px;
  margin: 0 auto 4rem;
  background: rgba(15, 23, 42, 0.6);
  border-left: 4px solid var(--primary);
  border-radius: 0 12px 12px 0;
  padding: 1.25rem 1.75rem;
  text-align: left;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.geo-box strong {
  color: #fff;
}

/* Section Common */
.section {
  padding: 4.5rem 0;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 3rem;
}

.section-tag {
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.section-title {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 800;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: var(--text-muted);
}

/* Grid & Cards */
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 1.75rem;
}

.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 2rem;
}

.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 16px;
  padding: 2rem;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  overflow: hidden;
}

.card:hover {
  background: var(--bg-card-hover);
  border-color: var(--border-accent);
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
}

.card-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
  background: rgba(0, 132, 255, 0.12);
  border: 1px solid rgba(0, 210, 255, 0.25);
}

.card-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
}

.card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* Comparison Table */
.table-wrapper {
  overflow-x: auto;
  margin: 2rem 0;
  border-radius: 14px;
  border: 1px solid var(--border-subtle);
  background: var(--bg-card);
}

.comp-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.comp-table th, .comp-table td {
  padding: 1.1rem 1.25rem;
  border-bottom: 1px solid var(--border-subtle);
}

.comp-table th {
  background: rgba(15, 23, 42, 0.95);
  font-weight: 700;
  color: #fff;
}

.comp-table tr:last-child td {
  border-bottom: none;
}

.comp-table .highlight-col {
  background: rgba(0, 132, 255, 0.08);
  font-weight: 600;
  color: #38bdf8;
}

/* Native Accordion FAQ */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-item[open] {
  border-color: var(--border-accent);
  background: var(--bg-card-hover);
}

.faq-summary {
  padding: 1.25rem 1.5rem;
  font-size: 1.05rem;
  font-weight: 600;
  color: #fff;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  user-select: none;
}

.faq-summary::-webkit-details-marker {
  display: none;
}

.faq-summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--cyan);
  transition: transform 0.2s ease;
}

.faq-item[open] .faq-summary::after {
  transform: rotate(45deg);
}

.faq-content {
  padding: 0 1.5rem 1.25rem;
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  border-top: 1px solid rgba(255, 255, 255, 0.04);
  margin-top: 0.25rem;
  padding-top: 0.75rem;
}

/* Blog Cards */
.blog-card {
  text-decoration: none;
  display: flex;
  flex-direction: column;
}

.blog-tag {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  background: rgba(0, 132, 255, 0.15);
  color: #38bdf8;
  margin-bottom: 0.75rem;
}

.blog-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 0.8rem;
  color: var(--text-dim);
  margin-top: auto;
  padding-top: 1rem;
}

/* Floating Badge */
.floating-badge {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 99;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  background: linear-gradient(135deg, #0084ff 0%, #0056d6 100%);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: 9999px;
  font-size: 0.9rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(0, 132, 255, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all 0.25s ease;
  animation: float-pulse 3s infinite;
}

.floating-badge:hover {
  transform: translateY(-3px) scale(1.03);
  box-shadow: 0 12px 30px rgba(0, 132, 255, 0.6);
}

@keyframes float-pulse {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-4px); }
}

/* Footer */
.footer {
  background: #04060b;
  border-top: 1px solid var(--border-subtle);
  padding: 4rem 0 2rem;
  margin-top: 5rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-desc {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-top: 0.75rem;
  max-width: 420px;
}

.footer-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 1rem;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.footer-link {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.9rem;
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--cyan);
}

.footer-bottom {
  padding-top: 2rem;
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  font-size: 0.85rem;
  color: var(--text-dim);
}

/* Article Styling (For /blog/*) */
.article-container {
  max-width: 820px;
  margin: 3rem auto;
  padding: 0 1.25rem;
}

.article-header {
  margin-bottom: 2.5rem;
}

.article-breadcrumbs {
  display: flex;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--text-dim);
  margin-bottom: 1rem;
}

.article-breadcrumbs a {
  color: var(--cyan);
  text-decoration: none;
}

.article-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 900;
  line-height: 1.2;
  color: #fff;
  margin-bottom: 1rem;
}

.article-body {
  font-size: 1.05rem;
  line-height: 1.8;
  color: #cbd5e1;
}

.article-body h2 {
  font-size: 1.65rem;
  font-weight: 800;
  color: #fff;
  margin: 2.5rem 0 1rem;
  border-bottom: 1px solid var(--border-subtle);
  padding-bottom: 0.5rem;
}

.article-body h3 {
  font-size: 1.3rem;
  font-weight: 700;
  color: #e2e8f0;
  margin: 1.75rem 0 0.75rem;
}

.article-body p {
  margin-bottom: 1.25rem;
}

.article-body ul, .article-body ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-body li {
  margin-bottom: 0.5rem;
}

.article-body strong {
  color: #fff;
}

.article-body blockquote {
  background: rgba(15, 23, 42, 0.7);
  border-left: 4px solid var(--primary);
  padding: 1rem 1.5rem;
  border-radius: 0 8px 8px 0;
  margin: 1.75rem 0;
  color: #94a3b8;
}

.article-body code {
  font-family: var(--font-mono);
  background: rgba(15, 23, 42, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.1);
  padding: 0.15rem 0.4rem;
  border-radius: 5px;
  color: #38bdf8;
  font-size: 0.9em;
}

.article-body pre {
  background: #090e1a;
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.25rem;
  overflow-x: auto;
  margin: 1.5rem 0;
}

.article-body pre code {
  background: transparent;
  border: none;
  padding: 0;
  color: #f1f5f9;
}

/* GEO & AI Search Optimization Components */
.geo-answer-box {
  background: linear-gradient(135deg, rgba(0, 210, 255, 0.08) 0%, rgba(0, 132, 255, 0.04) 100%);
  border: 1px solid rgba(0, 210, 255, 0.35);
  border-left: 4px solid var(--cyan);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1.5rem 0 2rem;
  box-shadow: 0 4px 20px rgba(0, 210, 255, 0.05);
}

.geo-answer-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.geo-answer-text {
  font-size: 1.05rem;
  line-height: 1.6;
  color: #f8fafc;
}

.geo-tldr-box {
  background: rgba(15, 23, 42, 0.7);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1.75rem 0;
}

.geo-tldr-title {
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.geo-tldr-list {
  list-style: none !important;
  padding-left: 0 !important;
  margin-bottom: 0 !important;
}

.geo-tldr-list li {
  position: relative;
  padding-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-muted);
}

.geo-tldr-list li::before {
  content: "✓";
  position: absolute;
  left: 0;
  color: var(--success);
  font-weight: bold;
}

.geo-table-wrapper {
  overflow-x: auto;
  margin: 1.75rem 0;
  border-radius: 12px;
  border: 1px solid var(--border-subtle);
  background: rgba(15, 23, 42, 0.6);
}

.geo-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.95rem;
}

.geo-table th {
  background: rgba(0, 132, 255, 0.12);
  color: #fff;
  padding: 0.85rem 1rem;
  font-weight: 700;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  white-space: nowrap;
}

.geo-table td {
  padding: 0.85rem 1rem;
  border-bottom: 1px solid var(--border-subtle);
  color: var(--text-muted);
  vertical-align: top;
}

.geo-table tr:last-child td {
  border-bottom: none;
}

.geo-table tr:hover td {
  background: rgba(255, 255, 255, 0.02);
}

.geo-faq-section {
  margin-top: 2.5rem;
  border-top: 1px solid var(--border-subtle);
  padding-top: 2rem;
}

.geo-faq-item {
  background: rgba(15, 23, 42, 0.6);
  border: 1px solid var(--border-subtle);
  border-radius: 10px;
  margin-bottom: 0.75rem;
  transition: border-color 0.2s;
}

.geo-faq-item[open] {
  border-color: rgba(0, 210, 255, 0.4);
}

.geo-faq-summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 700;
  color: #f1f5f9;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.geo-faq-summary::-webkit-details-marker {
  display: none;
}

.geo-faq-summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--cyan);
  transition: transform 0.2s;
}

.geo-faq-item[open] .geo-faq-summary::after {
  content: "−";
}

.geo-faq-answer {
  padding: 0 1.25rem 1.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Responsive */
@media (max-width: 900px) {
  .nav-menu {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}