/* ============================================================
   MOBILE — Responsive overrides for ≤768px
   All desktop layout preserved above this breakpoint.
   ============================================================ */

/* ── CSS custom property for bottom nav height ── */
:root {
  --mob-nav-height: 64px;
}

/* ══════════════════════════════════════════
   BOTTOM NAVIGATION BAR
   ══════════════════════════════════════════ */
.mob-nav {
  display: none; /* hidden on desktop */
}

@media (max-width: 768px) {
  .mob-nav {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: var(--mob-nav-height);
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--color-white);
    border-top: 1px solid rgba(0, 48, 73, 0.1);
    box-shadow: 0 -2px 16px rgba(0, 48, 73, 0.08);
    z-index: 700;
    align-items: stretch;
  }

  .mob-nav__btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    border: none;
    background: transparent;
    color: var(--color-text-caption);
    font-family: var(--font-primary);
    font-size: 10px;
    font-weight: 500;
    cursor: pointer;
    transition: color 0.15s, background 0.15s;
    min-width: 44px;
    padding: 6px 4px;
    border-radius: 0;
    -webkit-tap-highlight-color: transparent;
  }

  .mob-nav__btn:active {
    background: rgba(0, 48, 73, 0.05);
  }

  .mob-nav__btn.active {
    color: var(--color-crimson);
  }
}

/* ══════════════════════════════════════════
   SHEET BACKDROP
   ══════════════════════════════════════════ */
.mob-sheet-backdrop {
  display: none;
}

@media (max-width: 768px) {
  .mob-sheet-backdrop {
    display: block;
    position: fixed;
    inset: 0;
    background: rgba(0, 48, 73, 0.38);
    z-index: 750;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }

  .mob-sheet-backdrop.visible {
    opacity: 1;
    pointer-events: all;
  }
}

/* ══════════════════════════════════════════
   SHARED BOTTOM SHEET BEHAVIOUR
   sidebar + rpanel are moved to body via JS (iOS fix)
   ══════════════════════════════════════════ */
@media (max-width: 768px) {

  .sidebar,
  .rpanel {
    position: fixed !important;
    bottom: var(--mob-nav-height);
    left: 0;
    right: 0;
    width: 100% !important;
    min-width: 0 !important;
    max-width: 100%;
    /* Use 85vh to give content room to breathe */
    height: 85vh;
    max-height: calc(100vh - var(--mob-nav-height) - 44px);
    border-radius: 20px 20px 0 0;
    border: none !important;
    box-shadow: 0 -4px 32px rgba(0, 48, 73, 0.18);
    z-index: 800;
    overflow-y: auto;
    overflow-x: hidden;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
    background: var(--color-white);
    /* Hidden: fully off-screen + invisible to prevent any interaction leakage */
    transform: translateY(100%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.35s cubic-bezier(0.34, 1, 0.64, 1),
                visibility 0s linear 0.35s;
    padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 24px) !important;
    will-change: transform;
  }

  .sidebar.mob-open,
  .rpanel.mob-open {
    transform: translateY(0);
    visibility: visible;
    pointer-events: all;
    /* Cancel the visibility delay when opening */
    transition: transform 0.35s cubic-bezier(0.34, 1, 0.64, 1),
                visibility 0s linear 0s;
  }

  /* Drag handle */
  .sidebar::before,
  .rpanel::before {
    content: '';
    display: block;
    width: 36px;
    height: 4px;
    background: rgba(0, 48, 73, 0.18);
    border-radius: 2px;
    margin: 12px auto 4px;
    flex-shrink: 0;
    position: sticky;
    top: 0;
  }

  /* Desktop collapse controls hidden on mobile */
  .sidebar__collapse-btn,
  .sidebar-expand-btn,
  #rpanelCloseBtn,
  #showRpanelBtn {
    display: none !important;
  }

  /* Override any collapsed state on mobile */
  .sidebar.collapsed {
    width: 100% !important;
    min-width: 0 !important;
    transform: translateY(100%);
    visibility: hidden;
  }

  .sidebar.collapsed.mob-open {
    transform: translateY(0);
    visibility: visible;
  }

  .rpanel.collapsed {
    width: 100% !important;
    padding: var(--sp-sm) !important;
    transform: translateY(100%);
    visibility: hidden;
  }

  .rpanel.collapsed.mob-open {
    transform: translateY(0);
    visibility: visible;
  }

  /* Ensure sidebar tab panels scroll properly */
  .sidebar__tab-panel.active {
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
}

/* ══════════════════════════════════════════
   MOBILE COLOR SHEET
   ══════════════════════════════════════════ */
.mob-color-sheet {
  display: none;
}

@media (max-width: 768px) {
  .mob-color-sheet {
    display: block;
    position: fixed;
    bottom: var(--mob-nav-height);
    left: 0;
    right: 0;
    background: var(--color-white);
    border-radius: 20px 20px 0 0;
    box-shadow: 0 -4px 32px rgba(0, 48, 73, 0.18);
    z-index: 800;
    padding: 4px 20px 20px;
    padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 20px);
    transform: translateY(100%);
    visibility: hidden;
    pointer-events: none;
    transition: transform 0.35s cubic-bezier(0.34, 1, 0.64, 1),
                visibility 0s linear 0.35s;
    will-change: transform;
  }

  .mob-color-sheet.mob-open {
    transform: translateY(0);
    visibility: visible;
    pointer-events: all;
    transition: transform 0.35s cubic-bezier(0.34, 1, 0.64, 1),
                visibility 0s linear 0s;
  }

  .mob-sheet__handle {
    width: 36px;
    height: 4px;
    background: rgba(0, 48, 73, 0.18);
    border-radius: 2px;
    margin: 12px auto 16px;
  }

  .mob-sheet__title {
    font-family: var(--font-primary);
    font-size: 15px;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 16px;
  }

  .mob-color-sheet__swatches {
    display: flex !important;
    gap: 12px;
    flex-wrap: wrap;
    margin-bottom: 20px;
  }

  .mob-color-sheet__swatches .wall-theme-btn {
    width: 44px !important;
    height: 44px !important;
    border-radius: 50% !important;
    border: 2px solid rgba(0, 48, 73, 0.15) !important;
  }

  /* Color wheel row */
  .mob-color-sheet__custom {
    display: flex;
    align-items: center;
    gap: 12px;
  }

  /* Native color picker = color wheel on iOS */
  .mob-color-sheet__wheel-label {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: var(--font-primary);
    font-size: 13px;
    color: var(--color-navy);
    opacity: 0.7;
  }

  .mob-color-sheet__custom input[type="color"] {
    width: 48px;
    height: 48px;
    border: 2px solid rgba(0, 48, 73, 0.15);
    padding: 2px;
    border-radius: 50%;
    cursor: pointer;
    flex-shrink: 0;
    -webkit-appearance: none;
    appearance: none;
    background: none;
  }

  .mob-color-sheet__custom input[type="text"] {
    flex: 1;
    height: 44px;
    font-size: 14px;
    padding: 0 12px;
    border: 1.5px solid rgba(0, 48, 73, 0.18);
    border-radius: 10px;
    font-family: monospace;
    color: var(--color-navy);
  }
}

/* ══════════════════════════════════════════
   MOBILE GUIDE BUTTON (topbar)
   ══════════════════════════════════════════ */
.mob-guide-btn {
  display: none;
}

@media (max-width: 768px) {
  .mob-guide-btn {
    display: flex;
    align-items: center;
    gap: 5px;
    font-family: var(--font-primary);
    font-size: 12px;
    font-weight: 500;
    color: var(--color-navy);
    opacity: 0.7;
    background: rgba(0, 48, 73, 0.07);
    border: none;
    border-radius: var(--radius-pill);
    padding: 7px 12px;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    min-height: 36px;
    white-space: nowrap;
  }

  .mob-guide-btn:active {
    opacity: 1;
    background: rgba(0, 48, 73, 0.12);
  }
}

/* ══════════════════════════════════════════
   STEP GUIDE CAROUSEL (mobile)
   ══════════════════════════════════════════ */
.mob-guide {
  display: none;
}

@media (max-width: 768px) {
  .mob-guide {
    display: flex;
    position: fixed;
    inset: 0;
    background: rgba(0, 48, 73, 0.5);
    backdrop-filter: blur(3px);
    -webkit-backdrop-filter: blur(3px);
    z-index: 1050;
    align-items: center;
    justify-content: center;
    padding: 24px 16px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.25s ease;
  }

  .mob-guide.visible {
    opacity: 1;
    pointer-events: all;
  }

  .mob-guide__inner {
    background: var(--color-white);
    border-radius: 20px;
    width: 100%;
    max-width: 360px;
    overflow: hidden;
    position: relative;
    box-shadow: 0 20px 60px rgba(0, 48, 73, 0.25);
  }

  .mob-guide__close {
    position: absolute;
    top: 12px;
    right: 12px;
    width: 32px;
    height: 32px;
    border: none;
    background: rgba(0, 48, 73, 0.07);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 2;
    color: var(--color-navy);
    opacity: 0.6;
    -webkit-tap-highlight-color: transparent;
  }

  .mob-guide__close:active { opacity: 1; }

  /* Horizontal scroll-snap track */
  .mob-guide__track {
    display: flex;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
  }

  .mob-guide__track::-webkit-scrollbar { display: none; }

  .mob-guide__card {
    flex: 0 0 100%;
    scroll-snap-align: start;
    padding: 40px 28px 24px;
    text-align: center;
    box-sizing: border-box;
  }

  .mob-guide__card-step {
    font-family: var(--font-primary);
    font-size: 11px;
    font-weight: 600;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-orange);
    margin-bottom: 14px;
  }

  .mob-guide__icon {
    font-size: 40px;
    margin-bottom: 16px;
    display: block;
  }

  .mob-guide__title {
    font-family: var(--font-primary);
    font-size: 20px;
    font-weight: 600;
    color: var(--color-navy);
    margin-bottom: 10px;
    line-height: 1.25;
  }

  .mob-guide__body {
    font-family: var(--font-primary);
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-navy);
    opacity: 0.65;
    margin-bottom: 24px;
  }

  .mob-guide__cta {
    width: 100%;
    justify-content: center;
    gap: 8px;
    font-size: 14px;
    padding: 12px 20px;
    min-height: 48px;
  }

  /* Dots */
  .mob-guide__dots {
    display: flex;
    justify-content: center;
    gap: 8px;
    padding: 16px 0 20px;
  }

  .mob-guide__dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: rgba(0, 48, 73, 0.2);
    border: none;
    cursor: pointer;
    padding: 0;
    transition: background 0.2s, transform 0.2s;
    -webkit-tap-highlight-color: transparent;
  }

  .mob-guide__dot.active {
    background: var(--color-navy);
    transform: scale(1.25);
  }
}

/* ══════════════════════════════════════════
   TOPBAR — mobile simplification
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .topbar {
    padding: 0 12px;
    gap: 8px;
    padding-top: env(safe-area-inset-top, 0px);
    height: calc(var(--topbar-height) + env(safe-area-inset-top, 0px));
  }

  /* Hide step pills entirely — replaced by Guide carousel on mobile */
  .topbar__steps {
    display: none !important;
  }

  /* Hide clutter */
  .topbar__tagline,
  #takeTourBtn,
  #clearWallBtn {
    display: none !important;
  }

  /* Keep export only */
  .topbar__actions {
    margin-left: auto;
  }

  #exportBtn {
    font-size: 12px;
    padding: 7px 12px;
    min-height: 36px;
  }
}

/* ══════════════════════════════════════════
   WORKSPACE — mobile layout
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .workspace {
    overflow: visible;
  }

  .center {
    width: 100%;
    height: calc(100vh
      - var(--topbar-height)
      - var(--mob-nav-height)
      - env(safe-area-inset-top, 0px)
      - env(safe-area-inset-bottom, 0px));
    overflow: hidden;
  }

  /* Slim wall toolbar — keep only ref overlay controls */
  .wall-toolbar {
    padding: 6px 10px;
    gap: 6px;
    min-height: 0;
    flex-wrap: nowrap;
    overflow-x: auto;
  }

  /* Hide all wall toolbar groups except ref overlay */
  .wall-toolbar__group:has(#wallSz),
  .wall-toolbar__group:has(#gridSz),
  .wall-toolbar__group:has(.wall-theme-list),
  .wall-toolbar__divider,
  #guidesBtn,
  #showRpanelBtn,
  .sel-badge {
    display: none !important;
  }

  /* Remove keyboard shortcuts hint on mobile */
  .wall-toolbar > div[style*="margin-left:auto"],
  .wall-toolbar > div:last-child {
    display: none !important;
  }

  .wall-viewport {
    padding: 8px;
    overflow: hidden;
    align-items: flex-start;
    justify-content: flex-start;
  }

  .wall-wrapper {
    transform-origin: top left;
  }
}

/* ══════════════════════════════════════════
   TOUCH TARGET ENFORCEMENT
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  .btn, button, [role="button"] {
    min-height: 44px;
    min-width: 44px;
  }

  /* Exceptions for decorative/tiny elements */
  .wall-ref-handle,
  .mob-sheet__handle,
  .mob-guide__dot,
  .mob-guide__close {
    min-height: 0;
    min-width: 0;
  }

  /* Bigger frame resize handles */
  .wframe__rh {
    width: 20px !important;
    height: 20px !important;
  }

  /* Taller range sliders */
  input[type="range"] {
    height: 28px;
    accent-color: var(--color-navy);
  }

  /* Frame shelf: horizontal strip */
  .frame-shelf {
    flex-wrap: nowrap;
    overflow-x: auto;
    max-width: 100%;
    -webkit-overflow-scrolling: touch;
  }

  /* Modals: bottom sheet on mobile */
  .step-modal {
    padding: 20px 16px 32px;
    border-radius: 20px 20px 0 0;
    max-height: 88vh;
    margin: auto 0 0;
    width: 100%;
    max-width: 100%;
    overflow-y: auto;
  }

  .step-overlay {
    align-items: flex-end;
    padding: 0;
  }

  /* Welcome modal: full-width card on mobile */
  .welcome-card {
    padding: 36px 24px 32px;
    border-radius: 20px 20px 0 0;
    max-width: 100%;
    margin: auto 0 0;
  }

  .welcome-overlay {
    align-items: flex-end;
    padding: 0;
  }
}

/* ══════════════════════════════════════════
   TOUR — spotlight-based (all sizes)
   ══════════════════════════════════════════ */

/* The spotlight div is injected by tour.js at body level */
.tour-spotlight {
  position: fixed;
  z-index: 1101;
  pointer-events: none;
  border-radius: 10px;
}

/* Tooltip always above spotlight */
.tour-tooltip {
  z-index: 1102;
}

@media (max-width: 768px) {
  /* Pin tour tooltip above bottom nav on mobile */
  .tour-tooltip {
    position: fixed !important;
    bottom: calc(var(--mob-nav-height) + env(safe-area-inset-bottom, 0px) + 12px) !important;
    left: 12px !important;
    right: 12px !important;
    width: auto !important;
    top: auto !important;
    transform: translateY(8px) !important;
    border-radius: 16px;
    padding: 20px 18px 16px;
  }

  .tour-tooltip--visible {
    transform: translateY(0) !important;
  }

  .tour-tooltip__title { font-size: 14px; }
  .tour-tooltip__body  { font-size: 13px; }

  .tour-tooltip__next,
  .tour-tooltip__close {
    min-height: 40px;
    padding: 8px 16px;
    font-size: 13px;
  }
}

/* ══════════════════════════════════════════
   PREVENT OVERSCROLL / PULL-TO-REFRESH
   ══════════════════════════════════════════ */
@media (max-width: 768px) {
  #app {
    overscroll-behavior: none;
    -webkit-user-select: none;
    user-select: none;
  }

  input, textarea {
    -webkit-user-select: text;
    user-select: text;
  }

  #wall {
    touch-action: none;
  }
}