/* FALCON Friend Installation Portal - Stylesheet */
:root {
  --font-sans: -apple-system, BlinkMacSystemFont, "Pretendard", "Apple SD Gothic Neo", "Malgun Gothic", "Noto Sans KR", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;

  /* Premium Color System - Dark Default with Light Support */
  --bg-void: #060913;
  --bg-deep: #0A0F1D;
  --bg-card: #0F172A;
  --bg-card-subtle: #141E34;
  --bg-hover: #1E293B;

  --border-line: rgba(148, 163, 184, 0.16);
  --border-glow: rgba(59, 130, 246, 0.4);
  --border-focus: #3B82F6;

  --text-main: #F8FAFC;
  --text-dim: #94A3B8;
  --text-muted: #64748B;
  --text-white: #FFFFFF;

  --accent-blue: #3B82F6;
  --accent-cyan: #06B6D4;
  --accent-violet: #8B5CF6;
  --accent-gradient: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);
  --accent-gradient-glow: linear-gradient(135deg, #60A5FA 0%, #A78BFA 100%);

  --success: #10B981;
  --success-soft: rgba(16, 185, 129, 0.12);
  --success-border: rgba(16, 185, 129, 0.3);

  --warning: #F59E0B;
  --warning-soft: rgba(245, 158, 11, 0.12);
  --warning-border: rgba(245, 158, 11, 0.3);

  --danger: #EF4444;
  --danger-soft: rgba(239, 68, 68, 0.12);
  --danger-border: rgba(239, 68, 68, 0.3);

  --terminal-bg: #030712;
  --terminal-text: #F1F5F9;

  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-full: 9999px;

  --shadow-card: 0 12px 32px -4px rgba(0, 0, 0, 0.45);
  --shadow-glow: 0 0 24px rgba(59, 130, 246, 0.3);
}

[data-theme="light"] {
  --bg-void: #F8FAFC;
  --bg-deep: #F1F5F9;
  --bg-card: #FFFFFF;
  --bg-card-subtle: #F8FAFC;
  --bg-hover: #E2E8F0;

  --border-line: #E2E8F0;
  --border-glow: rgba(37, 99, 235, 0.25);
  --border-focus: #2563EB;

  --text-main: #0F172A;
  --text-dim: #475569;
  --text-muted: #64748B;
  --text-white: #FFFFFF;

  --accent-blue: #2563EB;
  --accent-cyan: #0891B2;
  --accent-violet: #7C3AED;
  --accent-gradient: linear-gradient(135deg, #2563EB 0%, #7C3AED 100%);
  --accent-gradient-glow: linear-gradient(135deg, #3B82F6 0%, #8B5CF6 100%);

  --terminal-bg: #0F172A;
  --terminal-text: #F8FAFC;

  --shadow-card: 0 10px 25px -3px rgba(0, 0, 0, 0.08);
  --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 80px;
}

body {
  font-family: var(--font-sans);
  background-color: var(--bg-void);
  color: var(--text-main);
  line-height: 1.65;
  font-size: 16px;
  word-break: keep-all;
  overflow-wrap: break-word;
  transition: background-color 0.25s ease, color 0.25s ease;
  min-height: 100vh;
}

/* Ambient Background Effect */
.bg-ambient {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 600px;
  background: radial-gradient(circle at 50% -10%, rgba(59, 130, 246, 0.18) 0%, rgba(139, 92, 246, 0.08) 50%, transparent 80%);
  pointer-events: none;
  z-index: -1;
}

.container {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

/* Header */
.sticky-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: rgba(6, 9, 19, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-line);
  transition: all 0.25s ease;
}

[data-theme="light"] .sticky-header {
  background-color: rgba(248, 250, 252, 0.88);
}

.header-inner {
  max-width: 900px;
  margin: 0 auto;
  padding: 14px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-main);
}

.logo-badge {
  background: var(--accent-gradient);
  color: #FFFFFF;
  font-size: 12px;
  font-weight: 800;
  padding: 3px 10px;
  border-radius: var(--radius-full);
  letter-spacing: 0.04em;
}

.logo-text {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: -0.01em;
}

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

.theme-btn, .quick-faq-btn {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  color: var(--text-main);
  height: 38px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 0 14px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-btn {
  width: 38px;
  padding: 0;
  justify-content: center;
  font-size: 16px;
}

.theme-btn:hover, .quick-faq-btn:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-glow);
}

/* ==========================================================================
   HERO SECTION (PREMIUM LANDING)
   ========================================================================== */
.hero-portal {
  padding: 56px 0 40px;
  text-align: center;
}

.hero-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  padding: 6px 16px;
  border-radius: var(--radius-full);
  font-size: 13.5px;
  font-weight: 700;
  color: var(--accent-cyan);
  margin-bottom: 20px;
  box-shadow: var(--shadow-glow);
}

.hero-headline {
  font-size: clamp(34px, 6vw, 50px);
  font-weight: 900;
  letter-spacing: -0.03em;
  line-height: 1.18;
  margin-bottom: 16px;
  color: var(--text-main);
}

.hero-headline span {
  background: var(--accent-gradient-glow);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: clamp(16px, 2.5vw, 19px);
  color: var(--text-dim);
  max-width: 620px;
  margin: 0 auto 36px;
  line-height: 1.6;
}

/* Big 2 Hero Buttons */
.hero-cta-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 32px;
}

.btn-primary-hero {
  background: var(--accent-gradient);
  color: #FFFFFF;
  border: none;
  padding: 16px 36px;
  border-radius: var(--radius-md);
  font-size: 18px;
  font-weight: 800;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  box-shadow: 0 8px 24px -2px rgba(59, 130, 246, 0.5);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.btn-primary-hero:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 30px 0 rgba(59, 130, 246, 0.65);
}

.btn-secondary-hero {
  background-color: var(--bg-card);
  color: var(--text-main);
  border: 1px solid var(--border-line);
  padding: 16px 32px;
  border-radius: var(--radius-md);
  font-size: 17px;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.2s ease;
}

.btn-secondary-hero:hover {
  background-color: var(--bg-hover);
  border-color: var(--border-glow);
  transform: translateY(-2px);
}

/* Feature Badges */
.feature-chips {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px 18px;
  flex-wrap: wrap;
  font-size: 13.5px;
  color: var(--text-dim);
  font-weight: 600;
}

.feature-chips span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.feature-chips span i {
  color: var(--success);
  font-style: normal;
  font-weight: 800;
}

/* Security Callout Banner */
.security-banner {
  background-color: var(--warning-soft);
  border: 1px solid var(--warning-border);
  border-left: 4px solid var(--warning);
  border-radius: var(--radius-md);
  padding: 16px 20px;
  margin: 10px 0 36px;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.security-banner-icon {
  font-size: 22px;
  line-height: 1;
}

.security-banner-text h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--warning);
  margin-bottom: 2px;
}

.security-banner-text p {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.5;
}

.security-mark {
  background-color: #FEF3C7;
  color: #92400E;
  padding: 1px 6px;
  border-radius: 4px;
  font-weight: 700;
}

[data-theme="dark"] .security-mark {
  background-color: #78350F;
  color: #FDE68A;
}

/* ==========================================================================
   MAIN SETUP WIZARD (1 STEP AT A TIME)
   ========================================================================== */
.setup-wizard-section {
  margin-bottom: 60px;
}

.wizard-portal-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: all 0.25s ease;
}

.wizard-card-top {
  padding: 22px 28px 18px;
  border-bottom: 1px solid var(--border-line);
  background-color: var(--bg-deep);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.wizard-step-badge {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 800;
  background-color: var(--accent-blue);
  color: #FFFFFF;
  padding: 4px 12px;
  border-radius: var(--radius-sm);
  letter-spacing: 0.04em;
}

/* Step Progress Dots */
.step-dots-row {
  display: flex;
  align-items: center;
  gap: 6px;
  flex-wrap: wrap;
}

.step-dot-btn {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border-line);
  background-color: var(--bg-card);
  color: var(--text-muted);
  font-size: 11px;
  font-family: var(--font-mono);
  font-weight: 700;
  display: grid;
  place-items: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.step-dot-btn:hover {
  border-color: var(--accent-blue);
  color: var(--accent-blue);
}

.step-dot-btn.active {
  background-color: var(--accent-blue);
  border-color: var(--accent-blue);
  color: #FFFFFF;
}

.step-dot-btn.completed {
  background-color: var(--success-soft);
  border-color: var(--success);
  color: var(--success);
}

/* Card Main Step Body */
.wizard-card-body {
  padding: 32px 32px 28px;
  min-height: 440px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.step-panel {
  display: none;
  animation: stepFade 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.step-panel.active {
  display: block;
}

@keyframes stepFade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.step-panel-title {
  font-size: clamp(22px, 4vw, 26px);
  font-weight: 800;
  color: var(--text-main);
  letter-spacing: -0.01em;
  line-height: 1.35;
  margin-bottom: 12px;
}

.step-panel-desc {
  font-size: 16px;
  color: var(--text-dim);
  line-height: 1.65;
  margin-bottom: 22px;
}

/* Command Box */
.command-box {
  margin-bottom: 16px;
}

.command-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
  display: flex;
  align-items: center;
  gap: 6px;
}

.command-line {
  display: flex;
  align-items: center;
  background-color: var(--terminal-bg);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  gap: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.command-code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--terminal-text);
  flex: 1;
  word-break: break-all;
  user-select: all;
  line-height: 1.45;
}

.copy-btn {
  background-color: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  color: #FFFFFF;
  padding: 7px 14px;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.copy-btn:hover {
  background-color: rgba(255, 255, 255, 0.22);
  border-color: rgba(255, 255, 255, 0.4);
}

.copy-btn.copied {
  background-color: var(--success);
  border-color: var(--success);
  color: #FFFFFF;
}

/* Expected Result / Note Boxes */
.result-callout {
  background-color: var(--success-soft);
  border: 1px solid var(--success-border);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 14px;
}

.result-callout-head {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--success);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.result-callout-body {
  font-size: 14px;
  color: var(--text-main);
  line-height: 1.55;
}

.code-pill {
  font-family: var(--font-mono);
  font-size: 12.5px;
  background-color: rgba(0, 0, 0, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  margin-top: 4px;
  display: inline-block;
  color: var(--text-main);
}

[data-theme="dark"] .code-pill {
  background-color: rgba(255, 255, 255, 0.1);
}

.issue-callout {
  background-color: var(--bg-card-subtle);
  border: 1px solid var(--border-line);
  border-left: 4px solid var(--warning);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin-bottom: 18px;
}

.issue-callout-head {
  font-size: 13.5px;
  font-weight: 700;
  color: var(--warning);
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.issue-callout-body {
  font-size: 13.5px;
  color: var(--text-dim);
  line-height: 1.55;
}

/* Wizard Footer Controls */
.wizard-footer-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-top: 32px;
  padding-top: 20px;
  border-top: 1px solid var(--border-line);
}

.step-check-toggle {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-dim);
  cursor: pointer;
  user-select: none;
}

.step-check-toggle input {
  width: 18px;
  height: 18px;
  accent-color: var(--success);
  cursor: pointer;
}

.step-buttons-wrap {
  display: flex;
  align-items: center;
  gap: 10px;
}

.btn-wizard {
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  padding: 11px 22px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: all 0.2s ease;
  border: 1px solid transparent;
}

.btn-wizard.prev {
  background-color: var(--bg-card-subtle);
  border-color: var(--border-line);
  color: var(--text-dim);
}

.btn-wizard.prev:hover:not(:disabled) {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.btn-wizard.prev:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.btn-wizard.next {
  background: var(--accent-gradient);
  color: #FFFFFF;
}

.btn-wizard.next:hover {
  box-shadow: 0 4px 14px rgba(59, 130, 246, 0.4);
  transform: translateY(-1px);
}

.btn-wizard.complete {
  background: var(--success);
}

/* ==========================================================================
   READY FOR TAKEOFF (4 CHANNELS)
   ========================================================================== */
.takeoff-box {
  background: linear-gradient(135deg, rgba(59, 130, 246, 0.12), rgba(139, 92, 246, 0.12));
  border: 2px solid var(--border-glow);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  margin-top: 24px;
}

.takeoff-tag {
  display: inline-block;
  background: var(--accent-gradient);
  color: #FFFFFF;
  padding: 3px 12px;
  border-radius: var(--radius-full);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.06em;
  margin-bottom: 10px;
}

.takeoff-title {
  font-size: 24px;
  font-weight: 900;
  margin-bottom: 8px;
}

.takeoff-desc {
  font-size: 15px;
  color: var(--text-dim);
  line-height: 1.6;
  margin-bottom: 18px;
}

.neutral-status-note {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-sm);
  padding: 10px 14px;
  font-size: 13.5px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
}

.channels-4-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .channels-4-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 480px) {
  .channels-4-grid {
    grid-template-columns: 1fr;
  }
}

.channel-card-item {
  background-color: var(--bg-card);
  border: 2px solid var(--border-line);
  border-radius: var(--radius-md);
  padding: 16px;
  cursor: pointer;
  transition: all 0.2s ease;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.channel-card-item:hover {
  border-color: var(--accent-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-glow);
}

.channel-card-item.selected {
  border-color: var(--accent-blue);
  background-color: var(--bg-card-subtle);
  box-shadow: 0 0 16px rgba(59, 130, 246, 0.25);
}

.channel-code {
  font-family: var(--font-mono);
  font-size: 16px;
  font-weight: 800;
  color: var(--text-main);
}

.channel-korean {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-dim);
}

/* ==========================================================================
   SECONDARY REFERENCE AREA (FAQ & TROUBLESHOOTING)
   ========================================================================== */
.secondary-reference-area {
  margin-top: 60px;
  padding-top: 40px;
  border-top: 1px solid var(--border-line);
}

.sec-title-wrap {
  margin-bottom: 24px;
}

.sec-main-title {
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 10px;
}

.sec-subtitle {
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 4px;
}

.accordion-wrap {
  display: grid;
  gap: 10px;
  margin-bottom: 36px;
}

.faq-card {
  background-color: var(--bg-card);
  border: 1px solid var(--border-line);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.faq-card:hover {
  border-color: var(--border-glow);
}

.faq-card[open] {
  border-color: var(--accent-blue);
}

.faq-card-summary {
  padding: 16px 20px;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--text-main);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  list-style: none;
  user-select: none;
}

.faq-card-summary::-webkit-details-marker {
  display: none;
}

.faq-left-title {
  display: flex;
  align-items: center;
  gap: 10px;
}

.faq-icon-tag {
  color: var(--accent-blue);
  font-weight: 800;
}

.faq-chevron {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform 0.2s ease;
}

.faq-card[open] .faq-chevron {
  transform: rotate(180deg);
}

.faq-card-body {
  padding: 0 20px 20px;
  font-size: 14.5px;
  color: var(--text-dim);
  line-height: 1.65;
  border-top: 1px solid var(--border-line);
  padding-top: 14px;
}

.faq-card-body ul {
  padding-left: 20px;
  margin-top: 8px;
}

.faq-card-body li {
  margin-bottom: 6px;
}

/* Toast */
.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  background-color: var(--text-main);
  color: var(--bg-void);
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-weight: 700;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  gap: 8px;
  animation: toastSlideUp 0.25s ease-out;
}

@keyframes toastSlideUp {
  from {
    transform: translateY(16px);
    opacity: 0;
  }
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

/* Footer */
footer {
  text-align: center;
  padding: 40px 0 20px;
  border-top: 1px solid var(--border-line);
  font-size: 13.5px;
  color: var(--text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .hero-cta-group {
    flex-direction: column;
  }
  .btn-primary-hero, .btn-secondary-hero {
    width: 100%;
    justify-content: center;
  }
  .wizard-card-top {
    flex-direction: column;
    align-items: flex-start;
  }
  .wizard-card-body {
    padding: 24px 20px;
  }
  .wizard-footer-nav {
    flex-direction: column-reverse;
  }
  .step-buttons-wrap {
    width: 100%;
  }
  .btn-wizard {
    flex: 1;
    justify-content: center;
  }
  .step-dots-row {
    display: none;
  }
}