/* =====================
   RESET & BASE
===================== */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --indigo-50: #eef2ff;
  --indigo-100: #e0e7ff;
  --indigo-200: #c7d2fe;
  --indigo-400: #818cf8;
  --indigo-600: #4f46e5;
  --indigo-700: #4338ca;
  --indigo-800: #3730a3;
  --indigo-900: #312e81;

  --bg: #ffffff;
  --bg-alt: #f8f8fc;
  --bg-card: #ffffff;
  --border: rgba(0, 0, 0, 0.08);
  --border-md: rgba(0, 0, 0, 0.13);
  --text-1: #111827;
  --text-2: #6b7280;
  --text-3: #9ca3af;
  --radius-md: 8px;
  --radius-lg: 14px;
  --shadow-card: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--text-1);
  font-size: 16px;
  line-height: 1.6;
}

[dir="rtl"] {
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
}

a {
  text-decoration: none;
}

/* =====================
   NAVBAR
===================== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 0.5px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  color: var(--indigo-600);
  font-size: 18px;
  line-height: 1;
  display: flex;
  align-items: center;
}

.logo-icon img {
  height: 46px;
  width: auto;
  display: block;
}

.logo-text {
  font-size: 17px;
  font-weight: 600;
  color: var(--text-1);
  letter-spacing: -0.02em;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* =====================
   LANG TOGGLE
===================== */
.lang-toggle {
  display: flex;
  background: var(--bg-alt);
  border: 0.5px solid var(--border-md);
  border-radius: 99px;
  padding: 3px;
  gap: 2px;
}

.lang-btn {
  background: transparent;
  border: none;
  border-radius: 99px;
  padding: 4px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.18s;
}

.lang-btn.active {
  background: var(--indigo-600);
  color: #fff;
}

/* =====================
   BUTTONS
===================== */
.btn-login {
  background: var(--indigo-600);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  padding: 8px 18px;
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.18s;
  white-space: nowrap;
}

.btn-login:hover {
  background: var(--indigo-700);
}

/* =====================
   PAGE HERO
===================== */
.page-hero {
  padding: 56px 24px 48px;
  border-bottom: 0.5px solid var(--border);
}

.page-hero-inner {
  max-width: 760px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: var(--indigo-50);
  color: var(--indigo-800);
  border: 0.5px solid var(--indigo-200);
  border-radius: 99px;
  font-size: 12px;
  font-weight: 500;
  padding: 5px 16px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.page-hero h1 {
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-1);
  margin-bottom: 12px;
  line-height: 1.2;
}

.page-hero p {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.7;
  max-width: 500px;
}

.last-updated {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 16px;
  font-size: 12px;
  color: var(--text-3);
}

/* =====================
   TAB NAV
===================== */
.tab-nav {
  position: sticky;
  top: 60px;
  z-index: 90;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 0.5px solid var(--border);
  padding: 0 24px;
}

.tab-nav-inner {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
}

.tab-btn {
  background: transparent;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 14px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.18s;
  font-family: inherit;
  margin-bottom: -1px;
}

.tab-btn.active {
  color: var(--indigo-600);
  border-bottom-color: var(--indigo-600);
}

.tab-btn:hover:not(.active) {
  color: var(--text-1);
}

/* =====================
   CONTENT
===================== */
.content-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 48px 24px 80px;
}

.section-block {
  display: none;
}

.section-block.active {
  display: block;
}

/* =====================
   TOC
===================== */
.toc {
  background: var(--bg-alt);
  border: 0.5px solid var(--border-md);
  border-radius: var(--radius-lg);
  padding: 20px 24px;
  margin-bottom: 40px;
}

.toc-title {
  font-size: 12px;
  font-weight: 600;
  color: var(--indigo-600);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.toc-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.toc-list a {
  font-size: 14px;
  color: var(--text-2);
  transition: color 0.15s;
}

.toc-list a:hover {
  color: var(--indigo-600);
}

.toc-list span {
  color: var(--text-3);
  margin-right: 8px;
  font-size: 12px;
}

/* =====================
   ARTICLE
===================== */
.article h2 {
  font-size: 18px;
  font-weight: 700;
  color: var(--text-1);
  letter-spacing: -0.02em;
  margin: 40px 0 10px;
  padding-top: 8px;
}

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

.article p {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.75;
  margin-bottom: 14px;
}

.article ul {
  padding-left: 20px;
  margin-bottom: 14px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

[dir="rtl"] .article ul {
  padding-left: 0;
  padding-right: 20px;
}

.article ul li {
  font-size: 15px;
  color: var(--text-2);
  line-height: 1.65;
}

.article a {
  color: var(--indigo-600);
}

.article a:hover {
  text-decoration: underline;
}

.divider {
  border: none;
  border-top: 0.5px solid var(--border);
  margin: 32px 0;
}

/* =====================
   INFO BOX
===================== */
.info-box {
  background: var(--indigo-50);
  border: 0.5px solid var(--indigo-200);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin-bottom: 20px;
}

.info-box p {
  color: var(--indigo-800);
  font-size: 14px;
  margin-bottom: 0;
}

/* =====================
   FOOTER
===================== */
.footer {
  border-top: 0.5px solid var(--border);
  padding: 28px 24px;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-copy {
  font-size: 13px;
  color: var(--text-3);
}

/* =====================
   RESPONSIVE
===================== */
@media (max-width: 600px) {
  .nav-inner {
    padding: 0 16px;
  }
  .content-wrap {
    padding: 32px 16px 60px;
  }
  .tab-btn {
    padding: 12px 14px;
    font-size: 13px;
  }
}