/* ========================================
   NotesEngine — Light Theme
   Clean white/light grey, system fonts
   ======================================== */

:root {
  --primary: #4f46e5;
  --primary-light: #6366f1;
  --primary-pale: #eef2ff;
  --accent: #059669;
  --accent-pale: #ecfdf5;
  --accent2: #dc2626;
  --accent2-pale: #fef2f2;
  --warning: #d97706;
  --warning-pale: #fffbeb;

  --bg:    #f5f7fb;
  --bg2:   #eef1f8;
  --bg3:   #e4e9f4;
  --card:  #ffffff;
  --card2: #f8fafd;
  --border:  #d0d7e6;
  --border2: #e6eaf4;

  --text:  #111827;
  --text2: #4b5563;
  --text3: #9ca3af;

  --font:         -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono:    ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --font-display: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --radius:    14px;
  --radius-sm: 8px;
  --shadow-sm: 0 1px 4px rgba(0,0,0,0.07);
  --shadow:    0 4px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.13);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  overflow-x: hidden;
  font-size: 15px;
}
a { color: var(--primary-light); text-decoration: none; transition: color .2s; }
a:hover { color: var(--primary); }
img { max-width: 100%; border-radius: var(--radius-sm); }

/* Scrollbar */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--bg2); }
::-webkit-scrollbar-thumb { background: #bdc6d8; border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary-light); }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(255,255,255,0.9);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border2);
  transition: all .3s;
}
.navbar.scrolled { background: #fff; box-shadow: var(--shadow-sm); }
.nav-container {
  max-width: 1400px; margin: 0 auto;
  display: flex; align-items: center; gap: 20px;
  padding: 0 24px; height: 60px;
}
.nav-brand {
  display: flex; align-items: center; gap: 8px;
  font-size: 19px; font-weight: 800; color: var(--text); text-decoration: none;
}
.brand-icon { font-size: 20px; }
.brand-accent { color: var(--primary); }
.nav-links { display: flex; gap: 2px; flex: 1; }
.nav-link {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 13px; border-radius: 8px;
  color: var(--text2); font-size: 14px; font-weight: 500;
  transition: all .18s; white-space: nowrap;
}
.nav-link:hover { background: var(--bg2); color: var(--text); }
.nav-link.active { background: var(--primary-pale); color: var(--primary); font-weight: 600; }
.nav-link i { font-size: 12px; }
.nav-actions { display: flex; gap: 8px; align-items: center; margin-left: auto; }
.nav-user { color: var(--text2); font-size: 14px; display: flex; align-items: center; gap: 6px; }
.btn-nav-outline {
  padding: 6px 14px; border-radius: 8px; font-size: 14px; font-weight: 500;
  border: 1px solid var(--border); color: var(--text2); background: transparent; cursor: pointer;
  transition: all .18s;
}
.btn-nav-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }
.btn-nav-primary {
  padding: 6px 16px; border-radius: 8px; font-size: 14px; font-weight: 600;
  background: var(--primary); color: #fff; border: none; cursor: pointer; transition: all .18s;
}
.btn-nav-primary:hover { background: #4338ca; color: #fff; }
.nav-toggle { display: none; background: none; border: none; color: var(--text); font-size: 20px; cursor: pointer; }
.nav-mobile {
  display: none; flex-direction: column; gap: 2px;
  padding: 10px 16px 14px; background: #fff; border-top: 1px solid var(--border2);
}
.nav-mobile a { padding: 9px 14px; border-radius: 8px; color: var(--text2); font-size: 14px; }
.nav-mobile a:hover { background: var(--bg2); color: var(--text); }
.nav-mobile.open { display: flex; }

/* ===== FLASH ===== */
.flash {
  position: fixed; top: 72px; right: 20px; z-index: 9999;
  padding: 12px 16px; border-radius: 10px; display: flex; gap: 10px; align-items: center;
  font-size: 14px; font-weight: 500; max-width: 380px; box-shadow: var(--shadow);
  animation: slideIn .25s ease;
}
.flash-success { background: var(--accent-pale); border: 1px solid #a7f3d0; color: #065f46; }
.flash-error   { background: var(--accent2-pale); border: 1px solid #fca5a5; color: #991b1b; }
.flash-info    { background: var(--primary-pale); border: 1px solid #c7d2fe; color: var(--primary); }
.flash button  { background: none; border: none; cursor: pointer; color: inherit; margin-left: auto; }
@keyframes slideIn { from { opacity:0; transform: translateX(24px); } to { opacity:1; transform: translateX(0); } }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; position: relative; overflow: hidden;
  display: flex; align-items: center;
  background: linear-gradient(150deg, #f0f3ff 0%, #f5f7fb 55%, #f0fdf4 100%);
}
.hero-grid {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(79,70,229,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(79,70,229,.05) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, black 20%, transparent 75%);
}
.hero-content {
  max-width: 1400px; margin: 0 auto; padding: 100px 24px 80px;
  position: relative; z-index: 1;
  display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: center;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 7px;
  background: var(--primary-pale); border: 1px solid #c7d2fe;
  padding: 5px 12px; border-radius: 100px; font-size: 13px; color: var(--primary); font-weight: 500;
  margin-bottom: 18px;
}
.hero-badge span { width: 6px; height: 6px; background: var(--accent); border-radius: 50%; animation: pulse 1.5s infinite; }
@keyframes pulse { 0%,100%{transform:scale(1);opacity:1;} 50%{transform:scale(1.4);opacity:.6;} }
.hero-title {
  font-size: clamp(34px,4.5vw,60px); line-height: 1.1; font-weight: 800;
  margin-bottom: 18px; letter-spacing: -.5px;
}
.hero-title .line1 { display: block; color: var(--text); }
.hero-title .line2 { display: block; color: var(--primary); }
.hero-title .line3 { display: block; color: var(--text3); font-size: .52em; font-weight: 600; margin-top: 8px; letter-spacing: 0; }
.hero-desc { color: var(--text2); font-size: 16px; margin-bottom: 32px; max-width: 460px; line-height: 1.75; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn-primary {
  padding: 12px 26px; border-radius: 10px; background: var(--primary); color: #fff;
  font-size: 15px; font-weight: 600; border: none; cursor: pointer; font-family: var(--font);
  transition: all .2s; display: inline-flex; align-items: center; gap: 7px;
}
.btn-primary:hover { background: #4338ca; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(79,70,229,.3); color: #fff; }
.btn-outline {
  padding: 12px 26px; border-radius: 10px; border: 1px solid var(--border);
  color: var(--text2); background: #fff; font-size: 15px; font-weight: 600; cursor: pointer;
  transition: all .2s; display: inline-flex; align-items: center; gap: 7px; font-family: var(--font);
}
.btn-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }
.hero-stats { display: flex; gap: 32px; margin-top: 36px; }
.stat-num  { font-size: 26px; font-weight: 800; color: var(--primary); letter-spacing: -.3px; }
.stat-label { font-size: 13px; color: var(--text3); margin-top: 2px; }

/* Hero visual */
.hero-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hero-card {
  background: #fff; border: 1px solid var(--border2); border-radius: var(--radius);
  padding: 20px; transition: all .25s; box-shadow: var(--shadow-sm);
}
.hero-card:hover { border-color: #c7d2fe; transform: translateY(-2px); box-shadow: var(--shadow); }
.hero-card-icon { font-size: 26px; margin-bottom: 8px; }
.hero-card h3 { font-size: 14px; font-weight: 700; color: var(--text); margin-bottom: 4px; }
.hero-card p  { font-size: 12px; color: var(--text3); line-height: 1.5; }
.hero-card .glow-dot { position: absolute; top: 12px; right: 12px; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }

/* ===== SECTION ===== */
.section { padding: 72px 24px; }
.section-inner { max-width: 1400px; margin: 0 auto; }
.section-header { text-align: center; margin-bottom: 48px; }
.section-label { display: inline-block; font-size: 11px; font-weight: 700; letter-spacing: 3px; text-transform: uppercase; color: var(--primary); margin-bottom: 10px; }
.section-title { font-size: clamp(22px,3vw,38px); font-weight: 800; color: var(--text); margin-bottom: 12px; letter-spacing: -.3px; }
.section-desc  { color: var(--text2); font-size: 16px; max-width: 500px; margin: 0 auto; }

/* ===== CATEGORY CARDS ===== */
.categories-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(290px,1fr)); gap: 18px; }
.cat-card {
  background: #fff; border: 1px solid var(--border2); border-radius: var(--radius);
  padding: 26px; cursor: pointer; transition: all .25s; text-decoration: none;
  display: block; box-shadow: var(--shadow-sm); position: relative;
}
.cat-card:hover { border-color: var(--cat-color,var(--primary)); transform: translateY(-3px); box-shadow: var(--shadow); }
.cat-icon-wrap { width: 52px; height: 52px; border-radius: 13px; display: flex; align-items: center; justify-content: center; font-size: 24px; margin-bottom: 14px; }
.cat-name { font-size: 19px; font-weight: 700; color: var(--text); margin-bottom: 5px; }
.cat-desc { color: var(--text2); font-size: 14px; margin-bottom: 16px; line-height: 1.6; }
.cat-meta { display: flex; gap: 14px; }
.cat-meta span { font-size: 12px; color: var(--text3); display: flex; align-items: center; gap: 5px; }
.cat-arrow { position: absolute; top: 22px; right: 22px; color: var(--text3); font-size: 15px; transition: all .25s; }
.cat-card:hover .cat-arrow { color: var(--cat-color,var(--primary)); transform: translate(3px,-3px); }

/* ===== NOTE CARDS ===== */
.notes-grid { display: grid; grid-template-columns: repeat(auto-fill,minmax(270px,1fr)); gap: 18px; }
.note-card {
  background: #fff; border: 1px solid var(--border2); border-radius: var(--radius);
  overflow: hidden; transition: all .25s; display: block; text-decoration: none; box-shadow: var(--shadow-sm);
}
.note-card:hover { border-color: #c7d2fe; transform: translateY(-2px); box-shadow: var(--shadow); }
.note-thumb { height: 148px; background: linear-gradient(135deg,var(--primary-pale),var(--bg2)); display: flex; align-items: center; justify-content: center; font-size: 42px; overflow: hidden; }
.note-thumb img { width: 100%; height: 100%; object-fit: cover; }
.note-body { padding: 16px; }
.note-badge { display: inline-block; padding: 2px 9px; border-radius: 100px; font-size: 11px; font-weight: 700; letter-spacing: .5px; text-transform: uppercase; margin-bottom: 7px; }
.note-title { font-size: 15px; font-weight: 700; color: var(--text); margin-bottom: 5px; line-height: 1.4; }
.note-desc { font-size: 13px; color: var(--text3); display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.note-meta { display: flex; gap: 12px; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--border2); }
.note-meta span { font-size: 12px; color: var(--text3); display: flex; align-items: center; gap: 5px; }

/* ===== LEARN LAYOUT ===== */
.learn-layout { display: flex; min-height: 100vh; padding-top: 60px; }
.sidebar {
  width: 272px; min-width: 272px; background: #fff; border-right: 1px solid var(--border2);
  height: calc(100vh - 60px); overflow-y: auto; position: sticky; top: 60px;
  display: flex; flex-direction: column;
}
.sidebar-header { padding: 18px 16px 12px; border-bottom: 1px solid var(--border2); }
.sidebar-title { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 2px; }
.sidebar-subtitle { font-size: 12px; color: var(--text3); }
.sidebar-search { padding: 10px 12px; border-bottom: 1px solid var(--border2); }
.sidebar-search input {
  width: 100%; background: var(--bg2); border: 1px solid var(--border2); border-radius: 7px;
  padding: 7px 11px; color: var(--text); font-size: 13px; outline: none; transition: border-color .18s;
  font-family: var(--font);
}
.sidebar-search input:focus { border-color: var(--primary); background: #fff; }
.chapter-list { flex: 1; padding: 6px; }
.chapter-group-title { padding: 10px 10px 5px; font-size: 10px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; color: var(--text3); }
.chapter-item {
  display: flex; align-items: center; gap: 8px;
  padding: 8px 11px; border-radius: 7px; cursor: pointer; text-decoration: none;
  color: var(--text2); font-size: 13px; transition: all .18s; margin-bottom: 1px;
}
.chapter-item:hover { background: var(--bg2); color: var(--text); }
.chapter-item.active { background: var(--primary-pale); color: var(--primary); font-weight: 600; }
.chapter-item .ch-icon { font-size: 13px; width: 16px; text-align: center; }
.chapter-item .ch-num { font-size: 11px; color: var(--text3); background: var(--bg2); padding: 1px 6px; border-radius: 4px; font-family: var(--font-mono); margin-left: auto; }
.chapter-item.active .ch-num { background: #c7d2fe; color: var(--primary); }

.learn-main { flex: 1; overflow-y: auto; background: var(--bg); }
.learn-content { max-width: 840px; margin: 0 auto; padding: 32px 36px; }

/* ===== CHAPTER ===== */
.chapter-breadcrumb { font-size: 13px; color: var(--text3); margin-bottom: 12px; }
.chapter-breadcrumb a { color: var(--text3); }
.chapter-breadcrumb a:hover { color: var(--primary); }
.chapter-title { font-size: clamp(20px,3vw,30px); font-weight: 800; color: var(--text); margin-bottom: 8px; letter-spacing: -.3px; }
.chapter-meta-row { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 24px; }
.meta-tag { font-size: 12px; color: var(--text3); display: flex; align-items: center; gap: 5px; }

/* Video */
.video-section { margin: 20px 0 24px; }
.video-wrap {
  position: relative; padding-bottom: 56.25%; height: 0; overflow: hidden;
  border-radius: var(--radius); background: #000; border: 1px solid var(--border2); box-shadow: var(--shadow-sm);
}
.video-wrap iframe { position: absolute; top: 0; left: 0; width: 100%; height: 100%; border: none; }
.video-title { font-size: 16px; font-weight: 700; margin: 12px 0 4px; color: var(--text); }
.video-desc  { color: var(--text2); font-size: 14px; }

/* PDF */
.pdf-section { margin: 24px 0; }
.pdf-section h3 { font-size: 17px; font-weight: 700; margin-bottom: 12px; color: var(--text); }
.pdf-wrap { border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border2); background: #fff; box-shadow: var(--shadow-sm); }
.pdf-toolbar { display: flex; align-items: center; gap: 10px; padding: 9px 14px; background: var(--bg2); border-bottom: 1px solid var(--border2); }
.pdf-toolbar span { font-size: 13px; color: var(--text2); }
.pdf-toolbar .pdf-pages { margin-left: auto; font-family: var(--font-mono); font-size: 12px; color: var(--text3); }
.pdf-embed { width: 100%; height: 680px; border: none; display: block; }

/* Content body */
.content-body { color: var(--text2); line-height: 1.85; font-size: 15px; }
.content-body h2 { font-size: 21px; font-weight: 800; color: var(--text); margin: 32px 0 12px; padding-bottom: 8px; border-bottom: 2px solid var(--border2); }
.content-body h3 { font-size: 17px; font-weight: 700; color: var(--text); margin: 22px 0 8px; }
.content-body p  { margin-bottom: 14px; }
.content-body ul, .content-body ol { padding-left: 20px; margin-bottom: 14px; }
.content-body li { margin-bottom: 6px; }
.content-body pre { background: #f6f8fa; border: 1px solid var(--border2); border-radius: 8px; padding: 16px; overflow-x: auto; font-family: var(--font-mono); font-size: 13px; margin-bottom: 14px; color: var(--text); }
.content-body code { font-family: var(--font-mono); font-size: 13px; background: var(--bg2); padding: 2px 6px; border-radius: 4px; color: #7c3aed; border: 1px solid var(--border2); }
.content-body pre code { color: var(--text); background: none; padding: 0; border: none; }
.content-body blockquote { border-left: 3px solid var(--primary); background: var(--primary-pale); padding: 10px 16px; border-radius: 0 8px 8px 0; color: var(--text2); margin: 16px 0; }
.content-body img { margin: 12px 0; border: 1px solid var(--border2); }
.content-body table { width: 100%; border-collapse: collapse; margin-bottom: 14px; border: 1px solid var(--border2); border-radius: var(--radius-sm); overflow: hidden; }
.content-body th { background: var(--bg2); color: var(--text); font-weight: 700; padding: 9px 13px; text-align: left; border-bottom: 2px solid var(--border); }
.content-body td { padding: 8px 13px; border-bottom: 1px solid var(--border2); color: var(--text2); }
.content-body tr:hover td { background: var(--bg); }
.content-body strong { color: var(--text); }
.content-body a { color: var(--primary-light); }

/* Chapter images */
.chapter-images { display: grid; grid-template-columns: repeat(auto-fill,minmax(240px,1fr)); gap: 12px; margin: 18px 0; }
.chapter-img-item { border-radius: var(--radius-sm); overflow: hidden; border: 1px solid var(--border2); box-shadow: var(--shadow-sm); }
.chapter-img-item img { width: 100%; height: 170px; object-fit: cover; transition: transform .3s; }
.chapter-img-item:hover img { transform: scale(1.03); }
.chapter-img-caption { padding: 6px 10px; background: var(--bg2); font-size: 12px; color: var(--text3); }

/* ===== FAQ ===== */
.faq-section { margin: 36px 0; border-top: 2px solid var(--border2); padding-top: 36px; }
.faq-section h3 { font-size: 20px; font-weight: 800; color: var(--text); margin-bottom: 18px; }
.faq-item { border: 1px solid var(--border2); border-radius: var(--radius-sm); margin-bottom: 8px; overflow: hidden; background: #fff; }
.faq-q { display: flex; align-items: center; justify-content: space-between; padding: 13px 16px; cursor: pointer; background: #fff; color: var(--text); font-size: 14px; font-weight: 600; transition: background .18s; }
.faq-q:hover { background: var(--bg2); }
.faq-item.open .faq-q { background: var(--primary-pale); color: var(--primary); }
.faq-icon { transition: transform .3s; font-size: 12px; color: var(--text3); }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-a { display: none; padding: 13px 16px; background: #fafbff; color: var(--text2); font-size: 14px; line-height: 1.8; border-top: 1px solid var(--border2); }
.faq-item.open .faq-a { display: block; }

/* ===== API EXPLORER ===== */
.api-layout { max-width: 1080px; margin: 0 auto; padding: 88px 24px 60px; }
.api-header { margin-bottom: 28px; }
.api-header h1 { font-size: 34px; font-weight: 800; color: var(--text); margin-bottom: 6px; letter-spacing: -.3px; }
.api-header p  { color: var(--text2); font-size: 15px; }
.api-filter { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 24px; }
.api-filter-btn { padding: 5px 15px; border-radius: 100px; border: 1px solid var(--border); background: #fff; color: var(--text2); font-size: 13px; cursor: pointer; transition: all .18s; font-family: var(--font); }
.api-filter-btn.active, .api-filter-btn:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.api-endpoint { background: #fff; border: 1px solid var(--border2); border-radius: var(--radius); margin-bottom: 10px; overflow: hidden; transition: border-color .18s; box-shadow: var(--shadow-sm); }
.api-endpoint:hover { border-color: #c7d2fe; }
.api-ep-header { display: flex; align-items: center; gap: 12px; padding: 14px 18px; cursor: pointer; }
.method-badge { padding: 3px 9px; border-radius: 6px; font-family: var(--font-mono); font-size: 11px; font-weight: 700; min-width: 52px; text-align: center; }
.method-GET    { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.method-POST   { background: var(--primary-pale); color: var(--primary); border: 1px solid #c7d2fe; }
.method-PUT    { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.method-DELETE { background: var(--accent2-pale); color: var(--accent2); border: 1px solid #fca5a5; }
.method-PATCH  { background: #fff7ed; color: #9a3412; border: 1px solid #fed7aa; }
.api-ep-url  { font-family: var(--font-mono); font-size: 13px; color: var(--text); flex: 1; word-break: break-all; }
.api-ep-name { font-size: 13px; color: var(--text3); }
.api-ep-body { padding: 0 18px 18px; border-top: 1px solid var(--border2); display: none; background: var(--bg); }
.api-ep-body.open { display: block; }
.api-ep-desc { color: var(--text2); font-size: 14px; margin: 12px 0; }
.api-test-row { display: flex; gap: 8px; margin-top: 12px; }
.api-url-input { flex: 1; background: #fff; border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; color: var(--text); font-family: var(--font-mono); font-size: 13px; outline: none; transition: border-color .18s; }
.api-url-input:focus { border-color: var(--primary); }
.btn-ping { padding: 8px 20px; border-radius: 8px; background: var(--primary); color: #fff; border: none; cursor: pointer; font-size: 14px; font-weight: 600; font-family: var(--font); transition: all .18s; display: flex; align-items: center; gap: 7px; }
.btn-ping:hover { background: #4338ca; }
.btn-ping.loading { opacity: .7; pointer-events: none; }
.api-response { margin-top: 12px; background: #fff; border: 1px solid var(--border2); border-radius: 8px; padding: 12px; }
.api-response-meta { display: flex; gap: 12px; margin-bottom: 8px; align-items: center; }
.resp-status { font-family: var(--font-mono); font-size: 13px; font-weight: 700; }
.resp-status.ok  { color: var(--accent); }
.resp-status.err { color: var(--accent2); }
.resp-time { font-size: 12px; color: var(--text3); font-family: var(--font-mono); }
.api-json { font-family: var(--font-mono); font-size: 12px; color: var(--text2); white-space: pre-wrap; max-height: 280px; overflow-y: auto; background: var(--bg2); padding: 12px; border-radius: 6px; border: 1px solid var(--border2); }

/* ===== AUTH ===== */
.auth-page { min-height: 100vh; display: flex; align-items: center; justify-content: center; padding: 24px; background: linear-gradient(150deg,#f0f3ff 0%,#f5f7fb 60%,#f0fdf4 100%); }
.auth-card { background: #fff; border: 1px solid var(--border2); border-radius: 18px; padding: 40px; width: 100%; max-width: 420px; box-shadow: var(--shadow-lg); }
.auth-logo { text-align: center; margin-bottom: 26px; font-size: 21px; font-weight: 800; color: var(--text); }
.auth-title { font-size: 24px; font-weight: 800; color: var(--text); margin-bottom: 5px; letter-spacing: -.3px; }
.auth-sub { color: var(--text2); font-size: 14px; margin-bottom: 26px; }
.form-label { display: block; font-size: 13px; font-weight: 600; color: var(--text2); margin-bottom: 6px; }
.form-input { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 9px; padding: 10px 13px; color: var(--text); font-size: 15px; font-family: var(--font); outline: none; transition: all .18s; }
.form-input:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(79,70,229,.08); }
.form-input::placeholder { color: var(--text3); }
.otp-inputs { display: flex; gap: 9px; justify-content: center; }
.otp-digit { width: 50px; height: 58px; background: var(--bg); border: 2px solid var(--border); border-radius: 11px; text-align: center; font-size: 24px; font-weight: 700; color: var(--text); font-family: var(--font-mono); outline: none; transition: all .18s; }
.otp-digit:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(79,70,229,.1); }
.btn-full { width: 100%; padding: 12px; border-radius: 10px; background: var(--primary); color: #fff; font-size: 15px; font-weight: 700; border: none; cursor: pointer; font-family: var(--font); transition: all .2s; }
.btn-full:hover { background: #4338ca; transform: translateY(-1px); box-shadow: 0 6px 18px rgba(79,70,229,.3); }
.auth-alt { text-align: center; margin-top: 18px; font-size: 14px; color: var(--text3); }
.auth-alt a { color: var(--primary); font-weight: 600; }
.otp-timer { text-align: center; font-size: 13px; color: var(--text3); margin-top: 12px; }
.otp-timer span { color: var(--primary); font-weight: 600; }
.resend-btn { background: none; border: none; color: var(--primary); font-size: 13px; cursor: pointer; font-family: var(--font); font-weight: 600; text-decoration: underline; }

/* ===== FOOTER ===== */
.footer { background: #fff; border-top: 1px solid var(--border2); padding: 56px 24px 0; }
.footer-container { max-width: 1400px; margin: 0 auto; display: grid; grid-template-columns: 2fr 1fr 1fr 2fr; gap: 40px; margin-bottom: 36px; }
.footer-logo { font-size: 19px; font-weight: 800; color: var(--text); margin-bottom: 10px; }
.footer-brand p { color: var(--text3); font-size: 14px; line-height: 1.7; margin-bottom: 16px; }
.footer-social { display: flex; gap: 8px; }
.footer-social a { width: 34px; height: 34px; border-radius: 8px; background: var(--bg2); border: 1px solid var(--border2); display: flex; align-items: center; justify-content: center; color: var(--text3); transition: all .18s; }
.footer-social a:hover { background: var(--primary); border-color: var(--primary); color: #fff; }
.footer-links h4 { font-size: 12px; font-weight: 700; color: var(--text); margin-bottom: 12px; text-transform: uppercase; letter-spacing: 1px; }
.footer-links a { display: block; color: var(--text3); font-size: 14px; margin-bottom: 8px; transition: color .18s; }
.footer-links a:hover { color: var(--primary); }
.footer-newsletter h4 { font-size: 12px; font-weight: 700; color: var(--text); margin-bottom: 8px; text-transform: uppercase; letter-spacing: 1px; }
.footer-newsletter p { color: var(--text3); font-size: 14px; margin-bottom: 12px; }
.newsletter-form { display: flex; gap: 8px; }
.newsletter-input { flex: 1; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 12px; color: var(--text); font-family: var(--font); font-size: 14px; outline: none; transition: border-color .18s; }
.newsletter-input:focus { border-color: var(--primary); background: #fff; }
.btn-primary-sm { padding: 8px 16px; border-radius: 8px; background: var(--primary); color: #fff; border: none; cursor: pointer; font-size: 14px; font-weight: 600; font-family: var(--font); transition: all .18s; white-space: nowrap; }
.btn-primary-sm:hover { background: #4338ca; }
.footer-bottom { border-top: 1px solid var(--border2); padding: 16px 0; text-align: center; max-width: 1400px; margin: 0 auto; }
.footer-bottom p { color: var(--text3); font-size: 13px; }

/* ===== ADMIN ===== */
.admin-layout { display: flex; min-height: 100vh; background: var(--bg); }
.admin-sidebar { width: 240px; min-width: 240px; background: #fff; border-right: 1px solid var(--border2); height: 100vh; position: sticky; top: 0; overflow-y: auto; display: flex; flex-direction: column; }
.admin-logo { padding: 18px 16px; border-bottom: 1px solid var(--border2); font-size: 17px; font-weight: 800; color: var(--text); }
.admin-nav { padding: 8px; flex: 1; }
.admin-nav-section { font-size: 10px; font-weight: 700; letter-spacing: 2px; color: var(--text3); text-transform: uppercase; padding: 14px 10px 5px; }
.admin-nav-item { display: flex; align-items: center; gap: 8px; padding: 8px 11px; border-radius: 8px; color: var(--text2); font-size: 13px; text-decoration: none; transition: all .18s; margin-bottom: 1px; cursor: pointer; border: none; background: none; width: 100%; font-family: var(--font); font-weight: 500; }
.admin-nav-item:hover { background: var(--bg2); color: var(--text); }
.admin-nav-item.active { background: var(--primary-pale); color: var(--primary); font-weight: 600; }
.admin-nav-item i { width: 15px; text-align: center; font-size: 13px; }
.admin-main { flex: 1; overflow-y: auto; }
.admin-topbar { position: sticky; top: 0; z-index: 100; background: #fff; border-bottom: 1px solid var(--border2); padding: 0 24px; height: 58px; display: flex; align-items: center; justify-content: space-between; }
.admin-topbar h1 { font-size: 17px; font-weight: 800; color: var(--text); letter-spacing: -.2px; }
.admin-content { padding: 24px; }
.admin-grid { display: grid; grid-template-columns: repeat(auto-fit,minmax(170px,1fr)); gap: 14px; margin-bottom: 24px; }
.stat-card { background: #fff; border: 1px solid var(--border2); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-sm); }
.stat-card .sc-icon { font-size: 24px; margin-bottom: 8px; }
.stat-card .sc-num { font-size: 26px; font-weight: 800; color: var(--text); letter-spacing: -.3px; }
.stat-card .sc-label { font-size: 12px; color: var(--text3); margin-top: 3px; }
.data-table { width: 100%; border-collapse: collapse; }
.data-table th { background: var(--bg2); padding: 9px 13px; text-align: left; font-size: 11px; font-weight: 700; color: var(--text2); border-bottom: 2px solid var(--border); text-transform: uppercase; letter-spacing: .5px; }
.data-table td { padding: 11px 13px; border-bottom: 1px solid var(--border2); font-size: 13px; color: var(--text2); }
.data-table tr:hover td { background: var(--bg); }
.table-wrap { background: #fff; border: 1px solid var(--border2); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow-sm); }
.table-header { display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border2); }
.table-header h3 { font-size: 15px; font-weight: 700; color: var(--text); }
.badge { display: inline-block; padding: 2px 9px; border-radius: 100px; font-size: 11px; font-weight: 700; }
.badge-success { background: #dcfce7; color: #166534; }
.badge-error   { background: #fee2e2; color: #991b1b; }
.badge-warning { background: #fef3c7; color: #92400e; }
.btn-sm { padding: 5px 12px; border-radius: 7px; font-size: 12px; font-weight: 600; cursor: pointer; border: none; font-family: var(--font); transition: all .18s; }
.btn-sm-primary { background: var(--primary); color: #fff; }
.btn-sm-primary:hover { background: #4338ca; }
.btn-sm-danger { background: #fee2e2; color: var(--accent2); border: 1px solid #fca5a5; }
.btn-sm-danger:hover { background: var(--accent2); color: #fff; }
.btn-sm-outline { background: #fff; border: 1px solid var(--border); color: var(--text2); }
.btn-sm-outline:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-pale); }
.admin-form-card { background: #fff; border: 1px solid var(--border2); border-radius: var(--radius); padding: 24px; max-width: 860px; box-shadow: var(--shadow-sm); }
.admin-form-card h3 { font-size: 16px; font-weight: 800; color: var(--text); margin-bottom: 20px; padding-bottom: 12px; border-bottom: 1px solid var(--border2); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 12px; font-weight: 700; color: var(--text2); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .5px; }
.form-control { width: 100%; background: var(--bg); border: 1px solid var(--border); border-radius: 8px; padding: 8px 11px; color: var(--text); font-size: 14px; font-family: var(--font); outline: none; transition: all .18s; }
.form-control:focus { border-color: var(--primary); background: #fff; box-shadow: 0 0 0 3px rgba(79,70,229,.07); }
textarea.form-control { resize: vertical; min-height: 96px; }
.ql-toolbar.ql-snow   { border-color: var(--border) !important; background: var(--bg2) !important; }
.ql-container.ql-snow { border-color: var(--border) !important; background: #fff !important; color: var(--text) !important; }
.ql-editor { min-height: 170px; color: var(--text); }
.modal-overlay { display: none; position: fixed; inset: 0; background: rgba(0,0,0,0.25); z-index: 10000; align-items: center; justify-content: center; backdrop-filter: blur(3px); }
.modal-overlay.open { display: flex; }
.modal { background: #fff; border: 1px solid var(--border2); border-radius: 16px; padding: 26px; max-width: 500px; width: 90%; max-height: 88vh; overflow-y: auto; box-shadow: var(--shadow-lg); }
.modal h3 { font-size: 17px; font-weight: 800; color: var(--text); margin-bottom: 16px; }

/* ===== UTILS ===== */
.text-center { text-align: center; }
.spinner { display: inline-block; width: 15px; height: 15px; border: 2px solid rgba(255,255,255,.4); border-top-color: #fff; border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state { text-align: center; padding: 56px 24px; color: var(--text3); }
.empty-state i { font-size: 40px; margin-bottom: 12px; display: block; opacity: .3; }
.progress-bar  { height: 4px; background: var(--bg3); border-radius: 2px; overflow: hidden; margin-top: 8px; }
.progress-fill { height: 100%; background: linear-gradient(90deg,var(--primary),#818cf8); border-radius: 2px; transition: width .5s ease; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .hero-content { grid-template-columns: 1fr; gap: 36px; }
  .hero-visual { display: none; }
  .footer-container { grid-template-columns: 1fr 1fr; gap: 28px; }
}
@media (max-width: 768px) {
  .nav-links, .nav-actions { display: none; }
  .nav-toggle { display: block; }
  .learn-layout { flex-direction: column; }
  .sidebar { width: 100%; min-width: unset; height: auto; position: relative; }
  .admin-sidebar { display: none; }
  .form-row { grid-template-columns: 1fr; }
  .footer-container { grid-template-columns: 1fr; gap: 24px; }
  .otp-inputs { gap: 7px; }
  .otp-digit { width: 44px; height: 52px; font-size: 22px; }
  .learn-content { padding: 20px 16px; }
  .admin-content { padding: 14px; }
  .section { padding: 48px 16px; }
}