@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

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

:root {
  --bg: #f8f9fa;
  --fg: #1a1d21;
  --card: #f0f1f3;
  --card-fg: #22262b;
  --border: #e2e4e8;
  --muted: #6b7280;
  --primary: #2563eb;
  --primary-fg: #fff;
  --primary-light: rgba(37,99,235,0.1);
  --destructive: #dc2626;
  --destructive-light: rgba(220,38,38,0.1);
  --success: #16a34a;
  --success-light: rgba(22,163,74,0.1);
  --warning: #f59e0b;
  --warning-light: rgba(245,158,11,0.1);
  --chart-2: #16a34a;
  --chart-3: #7c3aed;
  --chart-4: #ea580c;
  --sidebar-bg: #edeef0;
  --sidebar-border: #d5d7dc;
  --sidebar-active: rgba(37,99,235,0.08);
  --radius: 0.5rem;
  --shadow: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
}

.dark {
  --bg: #1a1d21;
  --fg: #e8eaed;
  --card: #22262b;
  --card-fg: #e0e2e6;
  --border: #2e3238;
  --muted: #9ca3af;
  --primary: #3b82f6;
  --primary-fg: #fff;
  --primary-light: rgba(59,130,246,0.12);
  --destructive: #ef4444;
  --destructive-light: rgba(239,68,68,0.12);
  --success: #22c55e;
  --success-light: rgba(34,197,94,0.12);
  --warning: #f59e0b;
  --warning-light: rgba(245,158,11,0.12);
  --chart-2: #22c55e;
  --chart-3: #a78bfa;
  --chart-4: #fb923c;
  --sidebar-bg: #151719;
  --sidebar-border: #2a2d32;
  --sidebar-active: rgba(59,130,246,0.12);
  --shadow: 0 1px 3px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.3);
}

html { height: 100%; }
body {
  font-family: 'Inter', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--fg);
  min-height: 100%;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
img { max-width: 100%; }

.app-layout {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 260px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 40;
  transition: transform 0.3s ease;
}

.sidebar-header {
  padding: 16px;
}

.sidebar-header a {
  display: flex;
  align-items: center;
  gap: 12px;
}

.sidebar-header img {
  width: 60px;
  height: 60px;
  object-fit: contain;
}

.sidebar-header .brand-name {
  font-weight: 700;
  font-size: 16px;
}

.sidebar-header .brand-subtitle {
  display: block;
  font-size: 11px;
  color: var(--muted);
  line-height: 1.2;
}

.sidebar-nav-label {
  padding: 8px 16px 4px;
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.sidebar-nav {
  list-style: none;
  padding: 0 8px;
}

.sidebar-nav li a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  transition: background 0.15s;
}

.sidebar-nav li a:hover {
  background: var(--sidebar-active);
}

.sidebar-nav li a.active {
  background: var(--sidebar-active);
  color: var(--primary);
}

.sidebar-nav li a svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.sidebar-footer {
  margin-top: auto;
  padding: 12px 16px;
  border-top: 1px solid var(--sidebar-border);
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  background: none;
  border: none;
  padding: 8px;
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--muted);
  width: 100%;
  transition: background 0.15s;
}

.theme-toggle:hover {
  background: var(--sidebar-active);
}

.main-content {
  flex: 1;
  margin-left: 260px;
  min-height: 100vh;
  overflow-y: auto;
}

.mobile-header {
  display: none;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 30;
}

.mobile-header .hamburger {
  background: none;
  border: none;
  padding: 4px;
  color: var(--fg);
}

.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 35;
}

@media (max-width: 768px) {
  .sidebar { transform: translateX(-100%); }
  .sidebar.open { transform: translateX(0); }
  .sidebar-overlay.open { display: block; }
  .main-content { margin-left: 0; }
  .mobile-header { display: flex; }
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 768px; margin: 0 auto; padding: 0 24px; }
.container-md { max-width: 900px; margin: 0 auto; padding: 0 24px; }

.page-padding { padding: 32px 24px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.card-content { padding: 20px; }
.card-header { padding: 20px 20px 8px; }
.card-title { font-size: 16px; font-weight: 600; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius);
  font-size: 14px;
  font-weight: 500;
  border: none;
  transition: all 0.15s;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: var(--primary-fg);
}
.btn-primary:hover { opacity: 0.9; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-outline {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--border);
}
.btn-outline:hover { background: var(--primary-light); }
.btn-outline:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-lg { padding: 12px 24px; font-size: 15px; }
.btn-sm { padding: 6px 12px; font-size: 13px; }

.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 2px 8px;
  border-radius: 9999px;
  font-size: 11px;
  font-weight: 500;
  white-space: nowrap;
}

.badge-primary { background: var(--primary); color: var(--primary-fg); }
.badge-secondary { background: var(--card); color: var(--muted); border: 1px solid var(--border); }
.badge-outline { background: transparent; border: 1px solid var(--border); color: var(--fg); }
.badge-success { background: var(--success-light); color: var(--success); border: 1px solid rgba(22,163,74,0.3); }
.badge-destructive { background: var(--destructive-light); color: var(--destructive); border: 1px solid rgba(220,38,38,0.3); }
.badge-warning { background: var(--warning-light); color: var(--warning); border: 1px solid rgba(245,158,11,0.3); }

.input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
  font-family: inherit;
  outline: none;
  transition: border-color 0.15s;
}
.input:focus { border-color: var(--primary); }

label.form-label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 6px;
}

.progress-bar {
  height: 8px;
  background: var(--border);
  border-radius: 9999px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: var(--primary);
  border-radius: 9999px;
  transition: width 0.5s ease;
}

.radio-group { display: flex; flex-direction: column; gap: 10px; }

.radio-option {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  font-size: 14px;
}

.radio-option:hover { border-color: var(--primary); }
.radio-option.selected { border-color: var(--primary); background: var(--primary-light); }

.radio-option input[type="radio"] {
  margin-top: 2px;
  accent-color: var(--primary);
  flex-shrink: 0;
}

.tabs-list {
  display: flex;
  gap: 2px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 3px;
  margin-bottom: 24px;
}

.tab-btn {
  flex: 1;
  padding: 8px 16px;
  border: none;
  background: transparent;
  border-radius: calc(var(--radius) - 2px);
  font-size: 14px;
  font-weight: 500;
  color: var(--muted);
  transition: all 0.15s;
}

.tab-btn.active {
  background: var(--primary);
  color: var(--primary-fg);
}

.tab-content { display: none; }
.tab-content.active { display: block; }

.accordion-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-bottom: 8px;
  overflow: hidden;
}

.accordion-trigger {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 12px 16px;
  background: none;
  border: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--fg);
  text-align: left;
  cursor: pointer;
}

.accordion-trigger svg {
  transition: transform 0.2s;
  flex-shrink: 0;
}

.accordion-trigger.open svg {
  transform: rotate(180deg);
}

.accordion-content {
  display: none;
  padding: 0 16px 12px;
  font-size: 14px;
  color: var(--muted);
  line-height: 1.6;
}

.accordion-content.open { display: block; }

.modal-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: 50;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.modal-overlay.open { display: flex; }

.modal {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  max-width: 640px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  padding: 24px;
  position: relative;
}

.modal-close {
  position: absolute;
  top: 12px;
  right: 12px;
  background: none;
  border: none;
  color: var(--muted);
  padding: 4px;
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
}

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
}
@media (min-width: 769px) and (max-width: 1024px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
}

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.gap-1 { gap: 4px; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 12px; }
.gap-4 { gap: 16px; }
.gap-6 { gap: 24px; }
.flex-1 { flex: 1; }
.flex-wrap { flex-wrap: wrap; }
.shrink-0 { flex-shrink: 0; }

.text-xs { font-size: 12px; }
.text-sm { font-size: 14px; }
.text-base { font-size: 16px; }
.text-lg { font-size: 18px; }
.text-xl { font-size: 20px; }
.text-2xl { font-size: 24px; }
.text-3xl { font-size: 30px; }
.text-4xl { font-size: 36px; }
.text-5xl { font-size: 48px; }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-muted { color: var(--muted); }
.text-primary { color: var(--primary); }
.text-success { color: var(--success); }
.text-destructive { color: var(--destructive); }
.text-warning { color: var(--warning); }

.mb-1 { margin-bottom: 4px; }
.mb-2 { margin-bottom: 8px; }
.mb-3 { margin-bottom: 12px; }
.mb-4 { margin-bottom: 16px; }
.mb-6 { margin-bottom: 24px; }
.mb-8 { margin-bottom: 32px; }
.mt-1 { margin-top: 4px; }
.mt-2 { margin-top: 8px; }
.mt-3 { margin-top: 12px; }
.mt-4 { margin-top: 16px; }
.mt-6 { margin-top: 24px; }
.mt-8 { margin-top: 32px; }
.ml-auto { margin-left: auto; }
.mx-auto { margin-left: auto; margin-right: auto; }

.p-3 { padding: 12px; }
.p-4 { padding: 16px; }
.p-6 { padding: 24px; }
.p-8 { padding: 32px; }
.px-2 { padding-left: 8px; padding-right: 8px; }
.py-0\.5 { padding-top: 2px; padding-bottom: 2px; }
.py-2 { padding-top: 8px; padding-bottom: 8px; }
.py-4 { padding-top: 16px; padding-bottom: 16px; }
.py-8 { padding-top: 32px; padding-bottom: 32px; }
.py-16 { padding-top: 64px; padding-bottom: 64px; }

.w-full { width: 100%; }
.h-full { height: 100%; }
.min-h-screen { min-height: 100vh; }

.rounded { border-radius: var(--radius); }
.rounded-full { border-radius: 9999px; }
.rounded-md { border-radius: 6px; }
.rounded-lg { border-radius: 8px; }

.border { border: 1px solid var(--border); }
.border-t { border-top: 1px solid var(--border); }

.overflow-hidden { overflow: hidden; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.break-all { word-break: break-all; }
.whitespace-pre-wrap { white-space: pre-wrap; }
.leading-relaxed { line-height: 1.7; }
.line-clamp-2 { display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.line-clamp-3 { display: -webkit-box; -webkit-line-clamp: 3; -webkit-box-orient: vertical; overflow: hidden; }

.font-mono { font-family: 'JetBrains Mono', monospace; }

.space-y-1 > * + * { margin-top: 4px; }
.space-y-2 > * + * { margin-top: 8px; }
.space-y-3 > * + * { margin-top: 12px; }
.space-y-4 > * + * { margin-top: 16px; }
.space-y-5 > * + * { margin-top: 20px; }

.hero-section {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--bg), var(--bg), var(--primary-light));
}

.hero-section canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 800px;
  margin: 0 auto;
  padding: 64px 24px;
  text-align: center;
}

.typing-cursor {
  display: inline-block;
  width: 2px;
  height: 1em;
  background: var(--primary);
  margin-left: 2px;
  animation: blink 1s step-end infinite;
  vertical-align: text-bottom;
}

@keyframes blink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-up {
  animation: fadeUp 0.5s ease forwards;
  opacity: 0;
}

.fade-up-delay-1 { animation-delay: 0.1s; }
.fade-up-delay-2 { animation-delay: 0.2s; }
.fade-up-delay-3 { animation-delay: 0.3s; }
.fade-up-delay-4 { animation-delay: 0.4s; }

@keyframes progressFill {
  from { width: 0; }
}

.animate-progress {
  animation: progressFill 1s ease forwards;
}

.email-preview {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--card);
  padding: 16px;
}

.result-feedback {
  border-radius: var(--radius);
  padding: 16px;
  font-size: 14px;
}

.result-feedback.correct {
  background: var(--success-light);
  border: 1px solid rgba(22,163,74,0.3);
}

.result-feedback.incorrect {
  background: var(--destructive-light);
  border: 1px solid rgba(220,38,38,0.3);
}

.score-circle {
  width: 64px;
  height: 64px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.question-review-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: rgba(var(--card), 0.5);
}

.question-review-header {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  color: var(--fg);
  cursor: pointer;
  border-radius: var(--radius);
  transition: background 0.15s;
}

.question-review-header:hover { background: var(--primary-light); }

.question-review-detail {
  display: none;
  padding: 0 12px 12px;
  border-top: 1px solid var(--border);
  margin: 0 12px;
  padding-top: 12px;
}

.question-review-detail.open { display: block; }

.explanation-box {
  background: var(--primary-light);
  border-radius: 6px;
  padding: 12px;
  margin-top: 12px;
}

.icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.icon-sm { width: 14px; height: 14px; }
.icon-lg { width: 24px; height: 24px; }
.icon-xl { width: 32px; height: 32px; }

.footer {
  border-top: 1px solid var(--border);
  padding: 32px 24px;
}

.select-wrapper {
  position: relative;
  display: inline-block;
}

.select {
  appearance: none;
  padding: 6px 32px 6px 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
  font-family: inherit;
  cursor: pointer;
  outline: none;
}

.select:focus { border-color: var(--primary); }

.select-wrapper::after {
  content: '';
  position: absolute;
  right: 10px;
  top: 50%;
  transform: translateY(-50%);
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid var(--muted);
  pointer-events: none;
}

.search-input-wrapper {
  position: relative;
  flex: 1;
  min-width: 200px;
  max-width: 400px;
}

.search-input-wrapper svg {
  position: absolute;
  left: 10px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--muted);
}

.search-input-wrapper .input {
  padding-left: 34px;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow-md);
  z-index: 100;
  animation: slideIn 0.3s ease;
  max-width: 360px;
}

@keyframes slideIn {
  from { transform: translateY(20px); opacity: 0; }
  to { transform: translateY(0); opacity: 1; }
}

.hidden { display: none !important; }

.skeleton {
  background: var(--border);
  border-radius: var(--radius);
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.5; }
}

.hover-card:hover {
  border-color: var(--primary);
  box-shadow: var(--shadow-md);
  transition: all 0.2s;
}
/* === NEWS CARDS === */

.news-card {
  background: #222222;
  border: 1px solid #1261ff;
  border-radius: 10px;
  padding: 18px;
  margin-bottom: 20px;
  transition: 0.2s ease;
  cursor: pointer;
}

.news-card:hover {
  border-color: var(--primary);
  transform: translateY(-3px);
}

.news-card h3 {
  margin-bottom: 8px;
  font-size: 18px;
  font-weight: 600;
}

.news-card p {
  margin-bottom: 10px;
  color: #555;
}

.news-card small {
  display: block;
  margin-bottom: 6px;
  color: #888;
}

.badge {
  display: inline-block;
  padding: 4px 8px;
  background: var(--primary);
  color: white;
  border-radius: 6px;
  font-size: 12px;
}