/* ============================================================
   APEXPROTOCOL — RESPONSIVE.CSS
   ============================================================ */

/* ── MOBILE DROPDOWN WRAPPER (hidden on desktop) ─────────── */
.mob-area-dropdown {
  display: none;
  position: relative;
  flex: 1;
  min-width: 0;
}

.mob-area-trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 6px 10px;
  border: 1px solid var(--border2);
  border-radius: 2px;
  background: var(--surf2);
  color: var(--text);
  font-family: 'JetBrains Mono', monospace;
  font-size: 10px;
  font-weight: 500;
  letter-spacing: .6px;
  cursor: pointer;
  transition: all .2s;
  -webkit-tap-highlight-color: transparent;
  text-transform: uppercase;
}
.mob-area-trigger:active { background: var(--surf3); }

.mob-trigger-label { flex: 1; text-align: left; }
.mob-trigger-arrow {
  font-size: 10px;
  color: var(--muted);
  transition: transform .2s;
  flex-shrink: 0;
}
.mob-area-trigger.open .mob-trigger-arrow { transform: rotate(180deg); }

/* colour the trigger to match current area */
[data-current="ai"]      .mob-area-trigger { border-color: var(--ai-border);      color: var(--ai); }
[data-current="net"]     .mob-area-trigger { border-color: var(--net-border);     color: var(--net); }
[data-current="hack"]    .mob-area-trigger { border-color: var(--hack-border);    color: var(--hack); }
[data-current="soft"]    .mob-area-trigger { border-color: var(--soft-border);    color: var(--soft); }
[data-current="crypto"]  .mob-area-trigger { border-color: var(--crypto-border);  color: var(--crypto); }
[data-current="cloud"]   .mob-area-trigger { border-color: var(--cloud-border);   color: var(--cloud); }
[data-current="mobile"]  .mob-area-trigger { border-color: var(--mobile-border);  color: var(--mobile); }
[data-current="devsec"]  .mob-area-trigger { border-color: var(--devsec-border);  color: var(--devsec); }
[data-current="selfdev"] .mob-area-trigger { border-color: var(--selfdev-border); color: var(--selfdev); }

/* ── DROPDOWN PANEL ──────────────────────────────────────── */
.mob-area-menu {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0; right: 0;
  z-index: 999;
  background: var(--surf);
  border: 1px solid var(--border2);
  border-radius: 4px;
  overflow: hidden;
  box-shadow: 0 16px 48px rgba(0,0,0,0.7);
  animation: dropDown .15s ease;
}
.mob-area-menu.open { display: block; }

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

.mob-area-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  cursor: pointer;
  font-size: 13px;
  color: var(--muted);
  border-bottom: 1px solid var(--border);
  transition: background .12s, color .12s;
  -webkit-tap-highlight-color: transparent;
}
.mob-area-item:last-child { border-bottom: none; }
.mob-area-item:active { background: var(--surf3); }
.mob-area-item.active { color: var(--text); background: var(--surf2); }

.mob-area-item .area-dot {
  width: 7px; height: 7px;
  border-radius: 50%;
  flex-shrink: 0;
  background: var(--dim);
}
.mob-area-item[data-area="ai"]      .area-dot { background: var(--ai); }
.mob-area-item[data-area="net"]     .area-dot { background: var(--net); }
.mob-area-item[data-area="hack"]    .area-dot { background: var(--hack); }
.mob-area-item[data-area="soft"]    .area-dot { background: var(--soft); }
.mob-area-item[data-area="crypto"]  .area-dot { background: var(--crypto); }
.mob-area-item[data-area="cloud"]   .area-dot { background: var(--cloud); }
.mob-area-item[data-area="mobile"]  .area-dot { background: var(--mobile); }
.mob-area-item[data-area="devsec"]  .area-dot { background: var(--devsec); }
.mob-area-item[data-area="selfdev"] .area-dot { background: var(--selfdev); }

/* ── HAMBURGER BUTTON (sidebar toggle on mobile) ─────────── */
.mob-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 36px; height: 36px;
  border: 1px solid var(--border2);
  border-radius: 2px;
  background: var(--surf2);
  color: var(--muted);
  cursor: pointer;
  flex-shrink: 0;
  font-size: 16px;
  transition: all .2s;
  -webkit-tap-highlight-color: transparent;
}
.mob-menu-btn:active { color: var(--text); border-color: var(--dim); }

/* ── SIDEBAR OVERLAY ─────────────────────────────────────── */
.sidebar-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 49;
  backdrop-filter: blur(2px);
}
.sidebar-overlay.show { display: block; }


/* ════════════════════════════════════════════════════════════
   TABLET  ≤ 900px
   ════════════════════════════════════════════════════════════ */
@media (max-width: 900px) {
  .site-header { padding: 0 14px; gap: 8px; }
  .logo        { font-size: 17px; letter-spacing: 2px; }
  .npill       { font-size: 9px; padding: 4px 9px; }
  .export-btn  { display: none; }
  .coffee-btn  { font-size: 9px; padding: 5px 10px; }
  .sidebar     { width: 170px; }

  .disc-hero  { padding: 20px 22px 14px; }
  .disc-title { font-size: 30px; }
  .disc-sub   { font-size: 12px; }
  .disc-stats { gap: 14px; }
  .stat-val   { font-size: 22px; }

  .phases      { padding: 16px 22px 40px; }
  .topics-grid { grid-template-columns: repeat(auto-fill, minmax(240px,1fr)); }
}


/* ════════════════════════════════════════════════════════════
   MOBILE  ≤ 640px
   ════════════════════════════════════════════════════════════ */
@media (max-width: 640px) {
  /* Header */
  .site-header { padding: 0 10px; height: 50px; gap: 8px; }
  .logo        { font-size: 15px; letter-spacing: 2px; }
  .coffee-btn  { font-size: 9px; padding: 5px 8px; }

  /* Swap desktop nav for mobile dropdown */
  .nav-scroll        { display: none; }
  .mob-area-dropdown { display: block; }
  .mob-menu-btn      { display: flex; }

  /* Sidebar → slide-over drawer */
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: 250px;
    z-index: 50;
    transform: translateX(-100%);
    transition: transform .28s cubic-bezier(.4,0,.2,1);
    padding-top: 56px;
    border-right: 1px solid var(--border2);
    box-shadow: 6px 0 30px rgba(0,0,0,0.6);
  }
  .sidebar.mob-open { transform: translateX(0); }

  /* Bigger tap targets in sidebar */
  .phase-nav-item         { padding: 12px 16px; font-size: 12px; }
  .phase-nav-item .ph-num { width: 22px; height: 22px; font-size: 10px; }

  /* Layout */
  .layout { display: block; }
  .main   { height: calc(100dvh - 52px); overflow-y: auto; }

  /* Hero */
  .disc-hero    { padding: 12px 14px 10px; }
  .disc-eyebrow { font-size: 8px; letter-spacing: 2px; margin-bottom: 3px; }
  .disc-title   { font-size: 22px; letter-spacing: 2px; margin-bottom: 4px; }
  .disc-sub     { font-size: 11px; margin-bottom: 8px; }
  .disc-stats   { gap: 10px; }
  .stat-val     { font-size: 18px; }
  .stat-label   { font-size: 7px; }

  /* Phases */
  .phases      { padding: 8px 10px 40px; }
  .phase-block { margin-bottom: 4px; }

  .phase-header  { padding: 14px 12px; gap: 10px; }
  .phase-num     { width: 30px; height: 30px; font-size: 15px; }
  .phase-name    { font-size: 13px; }
  .phase-tagline { font-size: 10px; }
  .level-badge   { font-size: 7px; padding: 2px 5px; }

  .phase-body { padding: 0 10px 12px; }
  .phase-desc { font-size: 11px; padding: 8px 0 10px; }

  /* Topics */
  .topics-grid      { grid-template-columns: 1fr; gap: 6px; }
  .topic-head       { padding: 12px 10px; }
  .topic-name       { font-size: 12px; }
  .topic-tag        { font-size: 7px; padding: 2px 5px; }
  .topic-body-inner { padding: 0 10px 10px; }
  .topic-desc       { font-size: 11px; }
  .master-list li   { font-size: 10px; padding: 4px 0 4px 14px; }
  .deep-dive p      { font-size: 10px; }

  /* Modals → bottom sheets */
  .modal-overlay { align-items: flex-end; padding: 0; }

  .modal {
    width: 100%; max-width: 100%;
    max-height: 88vh;
    border-radius: 10px 10px 0 0;
    padding: 8px 16px 20px;
    border-left: none; border-right: none; border-bottom: none;
  }
  .modal::before,
  .coffee-modal::before {
    content: '';
    display: block;
    width: 36px; height: 4px;
    background: var(--dim);
    border-radius: 2px;
    margin: 0 auto 14px;
  }
  .modal h2       { font-size: 22px; }
  .modal p        { font-size: 11px; }
  .modal-areas    { grid-template-columns: 1fr; gap: 6px; }
  .modal-area-btn { padding: 10px 12px; }
  .modal-actions  { flex-direction: column-reverse; gap: 6px; }
  .modal-actions button { width: 100%; }

  .coffee-modal {
    width: 100%; max-width: 100%;
    border-radius: 10px 10px 0 0;
    padding: 8px 16px 24px;
    border-left: none; border-right: none; border-bottom: none;
  }
  .coffee-icon     { font-size: 36px; margin-bottom: 8px; }
  .coffee-modal h2 { font-size: 24px; }
  .coffee-modal p  { font-size: 12px; }
  .coffee-amounts  { gap: 6px; }
  .amount-chip     { font-size: 10px; padding: 7px 12px; }
  .paypal-btn      { padding: 13px 24px; font-size: 14px; }
  .btn-primary, .btn-secondary { padding: 10px 20px; font-size: 10px; }
}


/* ════════════════════════════════════════════════════════════
   SMALL PHONES  ≤ 380px
   ════════════════════════════════════════════════════════════ */
@media (max-width: 380px) {
  .logo       { font-size: 13px; }
  .coffee-btn { display: none; }
  .disc-title { font-size: 19px; }
  .stat-val   { font-size: 16px; }
}


/* ── SAFE AREA (iPhone home bar)  */
@supports (padding: env(safe-area-inset-bottom)) {
  @media (max-width: 640px) {
    .main { height: calc(100dvh - 52px - env(safe-area-inset-bottom)); }
  }
}

/* ── TOUCH: kill hover flicker  */
@media (hover: none) and (pointer: coarse) {
  .phase-header:hover, .topic-card:hover { background: transparent; }
  .phase-header, .topic-card, .phase-nav-item,
  .npill, .amount-chip, .modal-area-btn  { -webkit-tap-highlight-color: transparent; }
}