:root {
  --dga-green: #006c35;
  --dga-green-dark: #004a24;
  --dga-green-soft: #e8f2ec;
  --surface: #ffffff;
  --surface-alt: #f5f7f5;
  --ink: #1a1a1a;
  --muted: #6b6b6b;
  --border: #e5e5e5;
  --accent: #c9a961;
  --radius: 10px;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --max-width: 1200px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: "IBM Plex Sans Arabic", "Inter", system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ink);
  background: var(--surface);
  -webkit-font-smoothing: antialiased;
}

html[lang="en"] body {
  font-family: "Inter", "IBM Plex Sans Arabic", system-ui, sans-serif;
}

a {
  color: var(--dga-green);
  text-decoration: none;
  transition: color 120ms ease;
}

a:hover {
  color: var(--dga-green-dark);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--dga-green);
  outline-offset: 2px;
  border-radius: 4px;
}

button {
  font: inherit;
  cursor: pointer;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--surface);
  border-block-end: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
  padding-block: 1rem;
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  color: var(--ink);
  font-weight: 600;
}

.brand img {
  height: 40px;
  width: auto;
  display: block;
}

.brand-divider {
  width: 1px;
  height: 28px;
  background: var(--border);
  display: inline-block;
}

.brand-subtitle {
  font-size: 0.92rem;
  color: var(--muted);
  font-weight: 500;
  letter-spacing: 0.01em;
}

.main-nav {
  display: flex;
  gap: 1.5rem;
  margin-inline-start: auto;
  align-items: center;
}

.main-nav a {
  color: var(--ink);
  font-weight: 500;
  font-size: 0.95rem;
}

.main-nav a.active,
.main-nav a:hover {
  color: var(--dga-green);
}

.lang-toggle {
  background: var(--dga-green-soft);
  color: var(--dga-green-dark);
  border: 1px solid var(--dga-green);
  padding: 0.45rem 0.9rem;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 120ms ease;
}

.lang-toggle:hover {
  background: var(--dga-green);
  color: white;
}

/* Hero */
.hero {
  position: relative;
  background: linear-gradient(135deg, var(--dga-green) 0%, var(--dga-green-dark) 100%);
  color: white;
  overflow: hidden;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("/assets/hero.svg");
  background-size: cover;
  background-position: center;
  opacity: 0.2;
  pointer-events: none;
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
  padding-block: 5rem;
  display: grid;
  gap: 1.5rem;
  max-width: 780px;
}

.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.2;
  font-weight: 700;
}

.hero p.lead {
  font-size: 1.15rem;
  opacity: 0.92;
  max-width: 640px;
}

.cta-row {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;
  margin-block-start: 0.5rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 120ms ease, background 120ms ease;
  border: 2px solid transparent;
}

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

.btn-primary:hover {
  transform: translateY(-1px);
  background: var(--dga-green-soft);
  color: var(--dga-green-dark);
}

.btn-outline {
  background: transparent;
  color: white;
  border-color: rgba(255, 255, 255, 0.6);
}

.btn-outline:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
  border-color: white;
}

/* Section */
.section {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
  padding-block: 4rem;
}

.section-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-block-end: 2rem;
  flex-wrap: wrap;
}

.section-head h2 {
  font-size: clamp(1.5rem, 2.5vw, 2rem);
  color: var(--dga-green-dark);
}

.section-head p {
  color: var(--muted);
  max-width: 520px;
}

.section-alt {
  background: var(--surface-alt);
  padding-block: 4rem;
}

.section-alt .section {
  padding-block: 0;
}

/* Study cards */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
}

.study-card {
  display: flex;
  flex-direction: column;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: transform 150ms ease, box-shadow 150ms ease, border-color 150ms ease;
  height: 100%;
}

.study-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--dga-green);
}

.study-card .thumb {
  aspect-ratio: 16 / 10;
  background: var(--dga-green-soft);
  overflow: hidden;
}

.study-card .thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.study-card .body {
  padding: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
  flex: 1;
}

.study-card time {
  font-size: 0.8rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
}

.study-card h3 {
  font-size: 1.1rem;
  line-height: 1.35;
  color: var(--ink);
}

.study-card p {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.topic-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-block-start: auto;
  padding-block-start: 0.5rem;
}

.chip {
  background: var(--dga-green-soft);
  color: var(--dga-green-dark);
  border-radius: 999px;
  padding: 0.2rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.chip-button {
  border: 1px solid var(--dga-green);
  background: var(--surface);
  color: var(--dga-green-dark);
  border-radius: 999px;
  padding: 0.4rem 0.9rem;
  font-size: 0.82rem;
  transition: background 120ms ease, color 120ms ease;
}

.chip-button.active,
.chip-button:hover {
  background: var(--dga-green);
  color: white;
}

/* Filters bar */
.filters {
  display: flex;
  gap: 1rem;
  align-items: center;
  flex-wrap: wrap;
  padding: 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-block-end: 2rem;
}

.search-input {
  flex: 1;
  min-width: 220px;
  padding: 0.6rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--surface);
}

.search-input:focus {
  outline: 2px solid var(--dga-green);
  border-color: transparent;
}

.sort-select {
  padding: 0.55rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font: inherit;
  background: var(--surface);
}

.topic-chip-row {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
  padding-block: 0.5rem;
  margin-block-end: 1.5rem;
}

/* Study detail page */
.study-hero {
  background: var(--surface-alt);
  border-block-end: 1px solid var(--border);
}

.study-hero .section {
  display: grid;
  gap: 1.2rem;
  padding-block: 3.5rem;
}

.study-hero time {
  color: var(--muted);
  font-size: 0.92rem;
  font-variant-numeric: tabular-nums;
}

.study-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  line-height: 1.25;
  color: var(--dga-green-dark);
}

.study-hero .summary {
  font-size: 1.08rem;
  color: var(--ink);
  max-width: 780px;
}

.study-body {
  max-width: 780px;
  margin-inline: auto;
  padding-block: 3rem;
  padding-inline: 1.5rem;
}

.study-body h1,
.study-body h2,
.study-body h3 {
  color: var(--dga-green-dark);
  margin-block-start: 1.5rem;
  margin-block-end: 0.75rem;
}

.study-body p {
  margin-block-end: 1rem;
  color: var(--ink);
}

.study-body blockquote {
  border-inline-start: 3px solid var(--dga-green);
  padding-inline-start: 1rem;
  padding-block: 0.5rem;
  margin-block: 1.25rem;
  color: var(--muted);
  background: var(--dga-green-soft);
  border-radius: 0 var(--radius) var(--radius) 0;
}

html[dir="rtl"] .study-body blockquote {
  border-radius: var(--radius) 0 0 var(--radius);
}

.study-body code {
  background: var(--surface-alt);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}

/* Study toolbar (download / open in new tab) */
.study-toolbar {
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
  margin-block-start: 0.5rem;
}

.btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--dga-green-dark);
  font-size: 0.88rem;
  font-weight: 500;
  transition: border-color 120ms ease, background 120ms ease;
}

.btn-ghost:hover {
  border-color: var(--dga-green);
  background: var(--dga-green-soft);
}

/* PDF embed */
.pdf-embed-wrap {
  background: var(--surface-alt);
  border-block-end: 1px solid var(--border);
}

.pdf-embed-inner {
  padding-block: 2rem;
  padding-inline: 1.5rem;
  max-width: var(--max-width);
  margin-inline: auto;
}

.pdf-embed {
  width: 100%;
  height: min(90vh, 1050px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  display: block;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 640px) {
  .pdf-embed { height: 70vh; }
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--dga-green);
  font-size: 0.9rem;
  margin-block-end: 1rem;
}

.back-link::before {
  content: "←";
  display: inline-block;
}

html[dir="rtl"] .back-link::before {
  content: "→";
}

/* About block */
.about-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
}

.about-block p {
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.7;
}

@media (max-width: 768px) {
  .about-block {
    grid-template-columns: 1fr;
  }
  .header-inner {
    flex-wrap: wrap;
    gap: 1rem;
  }
  .main-nav {
    margin-inline-start: 0;
    gap: 1rem;
    font-size: 0.88rem;
  }
  .hero-inner {
    padding-block: 3.5rem;
  }
}

/* ---- Demo / Test Guide page ---------------------------------------- */

.demo-hero {
  background: linear-gradient(135deg, var(--dga-green) 0%, var(--dga-green-dark) 100%);
  color: white;
  padding-block: 3.5rem;
  position: relative;
  overflow: hidden;
}

.demo-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image: url("/assets/hero.svg");
  background-size: cover;
  background-position: center;
  opacity: 0.12;
  pointer-events: none;
}

.demo-hero .section {
  position: relative;
  z-index: 1;
  padding-block: 0;
  display: grid;
  gap: 1.2rem;
  max-width: 820px;
}

.demo-hero .chat-badge {
  background: rgba(255, 255, 255, 0.14);
  color: white;
  border: 1px solid rgba(255, 255, 255, 0.3);
}

.demo-hero .chat-badge svg {
  color: var(--accent);
}

.demo-hero h1 {
  font-size: clamp(1.8rem, 3.2vw, 2.6rem);
  line-height: 1.25;
  font-weight: 700;
}

.demo-hero .demo-lead {
  font-size: 1.05rem;
  line-height: 1.75;
  opacity: 0.92;
  max-width: 720px;
}

.demo-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 1.5rem;
}

.demo-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1.5rem 1.6rem;
  display: grid;
  gap: 1rem;
  box-shadow: var(--shadow-sm);
}

.demo-card.is-baseline {
  border-color: var(--dga-green);
  background: linear-gradient(180deg, var(--dga-green-soft) 0%, var(--surface) 40%);
}

.demo-card.is-admin {
  border-inline-start: 4px solid var(--accent);
}

.demo-head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  flex-wrap: wrap;
}

.demo-head h2 {
  font-size: 1.25rem;
  color: var(--dga-green-dark);
  line-height: 1.4;
}

.demo-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border: 1px solid transparent;
}

.demo-badge.baseline {
  background: var(--dga-green-soft);
  color: var(--dga-green-dark);
  border-color: rgba(0, 108, 53, 0.25);
}

.demo-badge.policy {
  background: #fef1e0;
  color: #8a4a00;
  border-color: #f3c89a;
}

.demo-badge.guard {
  background: #e0edfb;
  color: #0d4a8a;
  border-color: #bad4f0;
}

.demo-badge.redaction {
  background: #f3ebfa;
  color: #5b2c87;
  border-color: #d7c0e9;
}

.demo-card > p {
  color: var(--muted);
  line-height: 1.7;
  font-size: 0.97rem;
}

.demo-prompts {
  display: grid;
  gap: 0.6rem;
  margin-block-start: 0.2rem;
}

.demo-prompt {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 0.7rem;
  padding: 0.8rem 0.9rem;
  background: var(--surface-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}

.demo-prompt-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--muted);
  background: var(--surface);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.demo-prompt code {
  font-family: "Inter", "IBM Plex Sans Arabic", monospace, system-ui;
  background: transparent;
  padding: 0;
  font-size: 0.95rem;
  color: var(--ink);
  overflow-wrap: anywhere;
  line-height: 1.45;
}

.demo-try {
  padding: 0.5rem 1rem;
  font-size: 0.85rem;
  border-radius: 999px;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .demo-prompt {
    grid-template-columns: 1fr;
    gap: 0.5rem;
  }
  .demo-prompt-label { justify-self: start; }
  .demo-try { justify-self: stretch; text-align: center; }
}

.demo-expected {
  display: grid;
  gap: 0.3rem;
  padding: 0.85rem 1rem;
  background: var(--dga-green-soft);
  border-radius: var(--radius);
  border-inline-start: 3px solid var(--dga-green);
}

.demo-expected strong {
  color: var(--dga-green-dark);
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.demo-expected p {
  color: var(--ink);
  font-size: 0.95rem;
  line-height: 1.65;
}

.demo-details {
  border-block-start: 1px dashed var(--border);
  padding-block-start: 0.85rem;
}

.demo-details summary {
  cursor: pointer;
  font-weight: 600;
  color: var(--dga-green-dark);
  font-size: 0.92rem;
  user-select: none;
}

.demo-details summary:hover {
  color: var(--dga-green);
}

.demo-details[open] summary {
  margin-block-end: 0.5rem;
}

.demo-details p {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
}

.demo-cta {
  text-align: center;
  padding-block: 2.5rem 1rem;
  display: grid;
  gap: 1rem;
  justify-items: center;
}

.demo-cta p {
  color: var(--muted);
  font-size: 1rem;
}

.demo-cta .btn {
  background: var(--dga-green);
  color: white;
  padding: 0.85rem 2rem;
}

.demo-cta .btn:hover {
  background: var(--dga-green-dark);
  color: white;
}

/* Footer */
.site-footer {
  background: var(--dga-green-dark);
  color: rgba(255, 255, 255, 0.85);
  padding-block: 2.5rem;
  margin-block-start: 4rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.5rem;
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  align-items: center;
  font-size: 0.9rem;
}

.site-footer a {
  color: white;
  opacity: 0.9;
}

/* Empty state */
.empty {
  text-align: center;
  padding: 4rem 1.5rem;
  color: var(--muted);
}

.empty h3 {
  color: var(--ink);
  margin-block-end: 0.5rem;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
  }
}