:root {
  --bg-dark: #0f172a;
  --card-bg: #1e293b;
  --card-hover: #334155;
  --primary: #38bdf8;
  --primary-glow: #00f2ff;
  --accent: #818cf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border-color: rgba(255, 255, 255, 0.1);
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

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

body {
  background-color: var(--bg-dark);
  color: var(--text-main);
  font-family: var(--font-family);
  line-height: 1.6;
  min-height: 100vh;
}

.help-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-color);
  padding: 16px 0;
}

.header-container {
  max-width: 1000px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 14px;
}

.logo-icon {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.2), rgba(0, 242, 255, 0.1));
  border: 1px solid rgba(56, 189, 248, 0.4);
  color: var(--primary);
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
}

h1 {
  font-size: 1.3rem;
  font-weight: 700;
  color: var(--text-main);
  letter-spacing: -0.01em;
}

.subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

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

.lang-switch {
  display: flex;
  background: rgba(0, 0, 0, 0.3);
  border-radius: 6px;
  padding: 2px;
  border: 1px solid var(--border-color);
}

.lang-btn {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 5px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn.active {
  background: var(--primary);
  color: #0f172a;
}

.btn-close {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid var(--border-color);
  color: var(--text-main);
  padding: 6px 14px;
  border-radius: 6px;
  font-weight: 600;
  font-size: 0.85rem;
  cursor: pointer;
  transition: background 0.2s ease;
}

.btn-close:hover {
  background: rgba(255, 255, 255, 0.15);
}

.help-content {
  max-width: 1000px;
  margin: 0 auto;
  padding: 36px 24px 60px 24px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.help-section h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Steps Grid */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 20px;
}

.step-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 24px;
  position: relative;
  transition: all 0.2s ease;
}

.step-card:hover {
  border-color: rgba(56, 189, 248, 0.4);
  transform: translateY(-2px);
}

.step-num {
  background: linear-gradient(135deg, #0284c7, #38bdf8);
  color: #0f172a;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  margin-bottom: 14px;
}

.step-card h3 {
  font-size: 1.05rem;
  margin-bottom: 8px;
  color: var(--text-main);
}

.step-card p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Modes Grid */
.modes-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.mode-info-card {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mode-badge {
  background: rgba(56, 189, 248, 0.15);
  color: var(--primary);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 3px 8px;
  border-radius: 4px;
  align-self: flex-start;
}

.mode-info-card h3 {
  font-size: 1rem;
  color: var(--text-main);
}

.mode-info-card p {
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.45;
}

/* Shortcuts Table */
.shortcuts-table-wrapper {
  overflow-x: auto;
  border: 1px solid var(--border-color);
  border-radius: 10px;
  background: var(--card-bg);
}

.shortcuts-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
  font-size: 0.9rem;
}

.shortcuts-table th, .shortcuts-table td {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border-color);
}

.shortcuts-table th {
  background: rgba(0, 0, 0, 0.25);
  color: var(--text-main);
  font-weight: 600;
}

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

kbd {
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 4px;
  padding: 3px 6px;
  font-family: monospace;
  font-size: 0.85rem;
  color: #38bdf8;
  font-weight: 600;
}

.table-note {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 10px;
}

code {
  font-family: monospace;
  color: #38bdf8;
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
}

/* Platform List */
.platform-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.platform-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 14px 18px;
  font-size: 0.9rem;
}

.platform-item strong {
  color: var(--primary);
  margin-right: 6px;
}

.platform-item span {
  color: var(--text-muted);
}

/* FAQ Accordion */
.faq-accordion {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  overflow: hidden;
}

.faq-item summary {
  padding: 16px 20px;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  font-size: 0.95rem;
  color: #e2e8f0;
  outline: none;
}

.faq-item summary:hover {
  color: var(--primary);
}

.faq-ans {
  padding: 0 20px 16px 20px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* Support Box */
.support-box {
  background: linear-gradient(135deg, rgba(56, 189, 248, 0.08), rgba(0, 0, 0, 0.2));
  border: 1px solid rgba(56, 189, 248, 0.25);
  border-radius: 12px;
  padding: 32px;
  text-align: center;
}

.support-box h3 {
  font-size: 1.15rem;
  margin-bottom: 8px;
}

.support-box p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.support-email-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: #0f172a;
  padding: 10px 22px;
  border-radius: 8px;
  font-weight: 700;
  font-size: 0.95rem;
  text-decoration: none;
  transition: all 0.2s ease;
}

.support-email-btn:hover {
  background: #7dd3fc;
  transform: translateY(-1px);
}