@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ── Tokens ── */
:root {
  --blue:        #0067b8;
  --blue-dark:   #005196;
  --blue-light:  #e8f1fb;
  --blue-mid:    #cce0f5;
  --ink:         #0f0f0f;
  --ink-2:       #1a1a1a;
  --ink-3:       #4a4a4a;
  --ink-4:       #7a7a7a;
  --ink-5:       #a0a0a0;
  --border:      #e2e2e2;
  --border-2:    #ececec;
  --surface:     #ffffff;
  --surface-2:   #f6f6f6;
  --surface-3:   #f0f0f0;
  --success:     #15803d;
  --success-bg:  #f0fdf4;
  --success-bd:  #bbf7d0;
  --danger:      #dc2626;
  --danger-bg:   #fef2f2;
  --danger-bd:   #fca5a5;
  --warn-bg:     #fffbeb;
  --warn-bd:     #fde68a;
  --warn:        #92400e;

  --radius-sm:   8px;
  --radius-md:   14px;
  --radius-lg:   20px;
  --radius-xl:   26px;

  --shadow-xs:   0 1px 2px rgba(0,0,0,.05);
  --shadow-sm:   0 2px 10px rgba(0,0,0,.06);
  --shadow-md:   0 4px 24px rgba(0,0,0,.08);

  --ease:        cubic-bezier(.33,1,.68,1);
  --font:        'Inter', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Layout */
  --sidebar-w:   268px;
  --header-h:    64px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
  background: var(--surface-2);
}
body {
  font-family: var(--font);
  color: var(--ink);
  background: var(--surface-2);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  overscroll-behavior: none;
}
img    { display: block; max-width: 100%; }
a      { text-decoration: none; color: inherit; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
ul     { list-style: none; }
svg {
  stroke: currentColor; fill: none;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
  display: inline-block; vertical-align: middle; flex-shrink: 0;
}

/* ── Progress bar ── */
.progress-bar {
  position: fixed; top: 0; left: 0; z-index: 1100;
  height: 3px; width: 0%;
  background: var(--blue);
  transition: width .1s linear;
}

/* ── Header ── */
.guide-header {
  position: sticky; top: 0; z-index: 900;
  height: var(--header-h);
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-xs);
}
.guide-header-inner {
  max-width: calc(var(--sidebar-w) + 920px + 64px);
  margin: 0 auto;
  padding: 0 32px;
  height: 100%;
  display: flex; align-items: center; gap: 16px;
}
.guide-brand {
  display: flex; align-items: center; gap: 9px;
  font-size: 18px; font-weight: 800;
  letter-spacing: -.02em; color: var(--ink);
  flex-shrink: 0;
}
.guide-brand img {
  width: 32px; height: 32px; border-radius: 50%;
  border: 1.5px solid rgba(0,0,0,.1);
}
.guide-header-label {
  font-size: 12px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--blue);
  padding: 4px 10px;
  background: var(--blue-light);
  border-radius: 100px;
  flex-shrink: 0;
}
.guide-back-btn {
  margin-left: auto;
  display: inline-flex; align-items: center; gap: 6px;
  padding: 8px 14px;
  font-size: 13px; font-weight: 500; color: var(--ink-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: color .15s, border-color .15s, background .15s;
  flex-shrink: 0;
}
.guide-back-btn svg { width: 14px; height: 14px; }
.guide-back-btn:hover { color: var(--ink); border-color: #aaa; background: var(--surface-2); }

/* ── Page wrap ── */
.guide-wrap {
  max-width: calc(var(--sidebar-w) + 920px + 64px);
  margin: 0 auto;
  padding: 0 32px 80px;
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  gap: 48px;
  align-items: start;
}

/* ── Sidebar ── */
.guide-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 32px);
  max-height: calc(100vh - var(--header-h) - 64px);
  overflow-y: auto;
  overscroll-behavior: contain;
  scrollbar-width: thin;
  scrollbar-color: var(--border) transparent;
  padding-top: 32px;
}
.guide-sidebar::-webkit-scrollbar { width: 4px; }
.guide-sidebar::-webkit-scrollbar-track { background: transparent; }
.guide-sidebar::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }

.sidebar-nav {
  display: flex; flex-direction: column; gap: 2px;
}
.sidebar-section-label {
  font-size: 10.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: .1em;
  color: var(--ink-5);
  padding: 14px 12px 6px;
}
.sidebar-section-label:first-child { padding-top: 0; }
.sidebar-link {
  display: flex; align-items: center; gap: 9px;
  padding: 9px 12px;
  font-size: 13.5px; font-weight: 500;
  color: var(--ink-4);
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  transition: background .15s, color .15s, border-color .15s;
  text-decoration: none;
}
.sidebar-link svg { width: 14px; height: 14px; opacity: .6; transition: opacity .15s; }
.sidebar-link:hover {
  background: var(--surface); color: var(--ink);
  border-color: var(--border);
}
.sidebar-link:hover svg { opacity: 1; }
.sidebar-link.is-active {
  background: var(--blue-light); color: var(--blue);
  border-color: var(--blue-mid); font-weight: 600;
}
.sidebar-link.is-active svg { opacity: 1; stroke: var(--blue); }

/* ── Main content ── */
.guide-main { min-width: 0; padding-top: 32px; }
/* ── Page title ── */
.guide-page-title {
  margin-bottom: 32px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--border);
}
.guide-page-title h1 {
  font-size: 2.25rem; font-weight: 800;
  letter-spacing: -.035em; color: var(--ink); line-height: 1.1;
  margin-bottom: 8px;
}
.guide-page-title p {
  font-size: 1rem; color: var(--ink-4); line-height: 1.7;
  max-width: 560px;
}

/* ── Guide toggle ── */
.guide-toggle-wrap {
  margin-bottom: 48px;
}
.guide-toggle {
  display: inline-flex;
  align-items: center;
  position: relative;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 5px;
  box-shadow: var(--shadow-xs);
}
.toggle-btn {
  position: relative; z-index: 1;
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px;
  font-size: 14px; font-weight: 600;
  color: var(--ink-4);
  border-radius: calc(var(--radius-lg) - 5px);
  transition: color .25s var(--ease);
  white-space: nowrap;
  background: none;
  border: none;
  cursor: pointer;
}
.toggle-btn svg { width: 15px; height: 15px; }
.toggle-btn.active { color: var(--ink); }
/* Sliding background pill */
.toggle-slider {
  position: absolute;
  top: 5px; left: 5px;
  height: calc(100% - 10px);
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: calc(var(--radius-lg) - 5px);
  box-shadow: var(--shadow-xs);
  transition: transform .3s var(--ease), width .3s var(--ease);
  pointer-events: none;
}

/* ── Guide content panels ── */
.guide-content { display: none; }
.guide-content.active { display: block; }

/* ── Section ── */
.guide-section {
  margin-bottom: 72px;
}
.guide-section:last-child { margin-bottom: 0; }

.section-header {
  display: flex; align-items: flex-start; gap: 20px;
  margin-bottom: 32px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-2);
}
.section-number {
  font-size: 11px; font-weight: 800;
  letter-spacing: .1em; color: var(--blue);
  background: var(--blue-light);
  border: 1px solid var(--blue-mid);
  border-radius: var(--radius-sm);
  padding: 4px 10px;
  flex-shrink: 0;
  margin-top: 4px;
}
.section-title {
  font-size: 1.5rem; font-weight: 800;
  letter-spacing: -.025em; color: var(--ink); line-height: 1.15;
  margin-bottom: 5px;
}
.section-desc { font-size: .9rem; color: var(--ink-4); line-height: 1.6; }

/* ── Cards grid ── */
.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.cards-grid--2 { grid-template-columns: repeat(2, 1fr); }

/* ── Guide card ── */
.guide-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px;
  display: flex; flex-direction: column; gap: 12px;
  transition: box-shadow .25s var(--ease), border-color .25s, transform .25s var(--ease);
}
.guide-card:hover {
  box-shadow: var(--shadow-md);
  border-color: #c5d8f0;
  transform: translateY(-3px);
}
.card-icon {
  width: 42px; height: 42px;
  background: var(--blue-light);
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}
.card-icon svg { width: 19px; height: 19px; stroke: var(--blue); }
.guide-card h3 {
  font-size: .9375rem; font-weight: 700;
  color: var(--ink); line-height: 1.3;
}
.guide-card p, .guide-card ul {
  font-size: .875rem; color: var(--ink-3); line-height: 1.7;
  word-break: break-word;
}

/* ── Notes ── */
.card-note {
  display: flex; align-items: flex-start; gap: 8px;
  padding: 10px 12px;
  background: var(--warn-bg);
  border: 1px solid var(--warn-bd);
  border-radius: var(--radius-sm);
  font-size: .8125rem; font-weight: 500; color: var(--warn);
  line-height: 1.5; margin-top: 4px;
}
.card-note svg { width: 14px; height: 14px; stroke: #d97706; margin-top: 1px; }
.card-note--success {
  background: var(--success-bg); border-color: var(--success-bd); color: var(--success);
}
.card-note--success svg { stroke: var(--success); }
.card-note--danger {
  background: var(--danger-bg); border-color: var(--danger-bd); color: var(--danger);
}
.card-note--danger svg { stroke: var(--danger); }

/* ── Steps list ── */
.steps-list {
  display: flex; flex-direction: column; gap: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  background: var(--surface);
}
.step-card {
  display: grid;
  grid-template-columns: 56px 1fr 56px;
  align-items: center;
  gap: 20px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--border-2);
  transition: background .2s;
}
.step-card:last-child { border-bottom: none; }
.step-card:hover { background: var(--surface-2); }
.step-num {
  font-size: 1.75rem; font-weight: 800;
  letter-spacing: -.04em; line-height: 1;
  -webkit-text-stroke: 2px var(--blue);
  color: transparent;
  text-align: center;
}
.step-body h3 {
  font-size: .9375rem; font-weight: 700;
  color: var(--ink); margin-bottom: 6px;
}
.step-body p { font-size: .875rem; color: var(--ink-3); line-height: 1.7; word-break: break-word; }
.step-list {
  margin: 8px 0 0 4px;
  display: flex; flex-direction: column; gap: 4px;
  list-style: disc; padding-left: 18px;
  font-size: .875rem; color: var(--ink-3);
}
.step-icon {
  display: flex; align-items: center; justify-content: center;
  width: 44px; height: 44px;
  background: var(--blue-light);
  border-radius: var(--radius-md);
  margin-left: auto;
}
.step-icon svg { width: 20px; height: 20px; stroke: var(--blue); }

/* ── FAQ ── */
.faq-list { display: flex; flex-direction: column; gap: 0; }
.faq-item {
  border-bottom: 1px solid var(--border);
  background: var(--surface);
}
.faq-item:first-child { border-top: 1px solid var(--border); border-radius: var(--radius-md) var(--radius-md) 0 0; }
.faq-item:last-child  { border-radius: 0 0 var(--radius-md) var(--radius-md); }
.faq-q {
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  padding: 18px 20px;
  font-size: .9375rem; font-weight: 600; color: var(--ink);
  cursor: pointer; list-style: none;
  transition: color .15s, background .15s;
}
.faq-q::-webkit-details-marker { display: none; }
.faq-q:hover { color: var(--blue); background: var(--blue-light); }
.faq-q svg { width: 16px; height: 16px; flex-shrink: 0; stroke: var(--ink-5); transition: transform .3s var(--ease), stroke .15s; }
details[open] .faq-q { color: var(--blue); }
details[open] .faq-q svg { transform: rotate(45deg); stroke: var(--blue); }
.faq-a {
  padding: 0 20px 18px;
  font-size: .875rem; color: var(--ink-3); line-height: 1.75;
  border-top: 1px solid var(--border-2);
  padding-top: 14px;
}

/* ── Reveal animation ── */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity .55s var(--ease), transform .55s var(--ease);
}
.reveal.in-view {
  opacity: 1;
  transform: translateY(0);
}

/* ── Back to top ── */
.back-to-top {
  position: fixed; bottom: 32px; right: 32px; z-index: 800;
  width: 44px; height: 44px;
  background: var(--ink); color: #fff;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0; transform: translateY(8px);
  transition: opacity .3s var(--ease), transform .3s var(--ease), background .15s;
  pointer-events: none;
}
.back-to-top.visible {
  opacity: 1; transform: translateY(0); pointer-events: auto;
}
.back-to-top:hover { background: #2e2e2e; }
.back-to-top svg { width: 18px; height: 18px; }

/* ══════════════════════════════════════════════
   RESPONSIVE - full coverage across all devices
══════════════════════════════════════════════ */

/* ── Base overflow guards - must be global ── */
.guide-wrap,
.guide-sidebar,
.guide-main,
.guide-content,
.guide-section,
.cards-grid,
.cards-grid--2,
.steps-list,
.faq-list,
.guide-page-title,
.guide-toggle-wrap {
  min-width: 0;
}

/* ── 1280px+ : 3-col cards ── */
@media (min-width: 1280px) {
  .cards-grid { grid-template-columns: repeat(3, 1fr); }
}

/* ── ≤1100px : narrow sidebar ── */
@media (max-width: 1100px) {
  :root { --sidebar-w: 210px; }
  .guide-wrap         { gap: 36px; padding: 0 24px 80px; }
  .guide-header-inner { padding: 0 24px; }
  .cards-grid         { grid-template-columns: repeat(2, 1fr); }
  .cards-grid--2      { grid-template-columns: repeat(2, 1fr); }
}

/* ── ≤860px : single-column, horizontal sidebar ── */
@media (max-width: 860px) {

  /* Single column layout - sidebar moves BELOW the page title/toggle */
  .guide-wrap {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 0 16px 64px;
    overflow-x: hidden;
  }

  /* Push sidebar after guide-main so title/toggle show first */
  .guide-sidebar { order: 2; }
  .guide-main    { order: 1; }

  /* Sidebar: sticky horizontal pill bar */
  .guide-sidebar {
    position: sticky;
    top: var(--header-h);
    z-index: 800;
    width: calc(100% + 32px);
    margin-left: -16px;
    padding: 0 16px;
    max-height: none;
    overflow: visible;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    box-shadow: 0 2px 8px rgba(0,0,0,.05);
  }

  .sidebar-nav {
    flex-direction: row;
    flex-wrap: nowrap;
    overflow-x: auto;
    gap: 6px;
    padding: 10px 0;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .sidebar-nav::-webkit-scrollbar { display: none; }
  .sidebar-section-label { display: none; }

  .sidebar-link {
    white-space: nowrap;
    flex-shrink: 0;
    font-size: 12.5px;
    padding: 7px 14px;
    border-radius: 100px;
    border: 1px solid var(--border);
  }
  .sidebar-link svg { display: none; }
  .sidebar-link:hover { background: var(--surface-2); color: var(--ink); }
  .sidebar-link.is-active {
    background: var(--blue-light);
    color: var(--blue);
    border-color: var(--blue-mid);
    font-weight: 600;
  }

  /* Main */
  .guide-main { padding-top: 20px; }

  /* Cards: step icon hidden, 2-col cards stay 2-col until 600px */
  .step-card  { grid-template-columns: 48px 1fr; }
  .step-icon  { display: none; }

  /* 2-col card grid stays at tablet */
  .cards-grid    { grid-template-columns: repeat(2, 1fr); }
  .cards-grid--2 { grid-template-columns: 1fr 1fr; }

  .guide-section { margin-bottom: 56px; }
}

/* ── ≤600px : full mobile ── */
@media (max-width: 600px) {

  :root { --header-h: 56px; }

  /* ── Header ── */
  .guide-header         { height: var(--header-h); }
  .guide-header-inner   { padding: 0 16px; gap: 10px; }
  .guide-brand          { font-size: 15px; }
  .guide-brand img      { width: 26px; height: 26px; }
  .guide-header-label   { display: none; }
  .guide-back-btn       { padding: 7px 10px; gap: 4px; font-size: 12px; }

  /* ── Sidebar ── */
  .guide-sidebar { top: var(--header-h); order: 2; width: calc(100% + 28px); margin-left: -14px; padding: 0 14px; }
  .sidebar-nav   { gap: 4px; padding: 8px 0; }
  .sidebar-link  { font-size: 11.5px; padding: 6px 11px; }

  /* ── Wrap ── */
  .guide-wrap { padding: 0 14px 56px; overflow-x: hidden; }
  .guide-main { padding-top: 20px; order: 1; }

  /* ── Page title ── */
  .guide-page-title    { margin-bottom: 20px; padding-bottom: 16px; }
  .guide-page-title h1 { font-size: 1.55rem; letter-spacing: -.02em; }
  .guide-page-title p  { font-size: .875rem; max-width: 100%; }

  /* ── Guide toggle - full width, equal halves ── */
  .guide-toggle-wrap  { margin-bottom: 32px; }
  .guide-toggle       { display: flex; width: 100%; }
  .toggle-btn         {
    flex: 1;
    justify-content: center;
    padding: 11px 8px;
    font-size: 13px;
    gap: 6px;
    min-width: 0;       /* prevent overflow */
  }
  .toggle-btn svg     { width: 14px; height: 14px; flex-shrink: 0; }
  .toggle-btn span    { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

  /* ── Section ── */
  .guide-section  { margin-bottom: 44px; }
  .section-header { gap: 12px; margin-bottom: 20px; padding-bottom: 14px; }
  .section-number { font-size: 10px; padding: 3px 8px; }
  .section-title  { font-size: 1.2rem; }
  .section-desc   { font-size: .83rem; }

  /* ── Cards - single column ── */
  .cards-grid,
  .cards-grid--2    { grid-template-columns: 1fr; gap: 10px; }
  .guide-card       { padding: 18px; gap: 10px; border-radius: var(--radius-lg); min-width: 0; }
  .card-icon        { width: 34px; height: 34px; }
  .card-icon svg    { width: 15px; height: 15px; }
  .guide-card h3    { font-size: .875rem; }
  .guide-card p     { font-size: .8125rem; }
  .card-note        { font-size: .75rem; padding: 8px 10px; }

  /* ── Steps ── */
  .steps-list        { border-radius: var(--radius-lg); }
  .step-card         {
    grid-template-columns: 38px 1fr;
    gap: 12px;
    padding: 16px 14px;
    min-width: 0;
  }
  .step-icon         { display: none !important; }
  .step-body         { min-width: 0; }
  .step-num          { font-size: 1.25rem; -webkit-text-stroke: 1.5px var(--blue); }
  .step-body h3      { font-size: .875rem; }
  .step-body p       { font-size: .8125rem; }
  .step-list         { font-size: .8125rem; }

  /* ── FAQ ── */
  .faq-q             { font-size: .875rem; padding: 14px 14px; gap: 10px; }
  .faq-a             { font-size: .8125rem; padding: 12px 14px; }
  .faq-item:first-child { border-radius: var(--radius-sm) var(--radius-sm) 0 0; }
  .faq-item:last-child  { border-radius: 0 0 var(--radius-sm) var(--radius-sm); }

  /* ── Back to top ── */
  .back-to-top       { bottom: 14px; right: 14px; width: 40px; height: 40px; }
  .back-to-top svg   { width: 16px; height: 16px; }
}

/* ── ≤380px : very small ── */
@media (max-width: 380px) {
  .guide-page-title h1 { font-size: 1.35rem; }
  .section-title       { font-size: 1.1rem; }
  .toggle-btn          { font-size: 12px; padding: 10px 6px; }
  .toggle-btn svg      { display: none; }
  .guide-card          { padding: 14px; }
  .step-card           { padding: 12px 10px; gap: 10px; }
  .sidebar-link        { font-size: 11px; padding: 5px 10px; }
}

/* ── prefers-reduced-motion ── */
@media (prefers-reduced-motion: reduce) {
  .reveal                        { opacity: 1; transform: none; transition: none; }
  .guide-card, .step-card        { transition: none; }
  .back-to-top                   { transition: opacity .2s; }
  .toggle-slider                 { transition: none; }
  .sidebar-link                  { transition: none; }
}