/*
 * main.css — PDF Presenter Styles
 *
 * Dark theme with CSS custom properties.
 * Resizable layout via CSS Grid and custom property splitters.
 */

/* ================================================================== */
/*  Google Fonts                                                       */
/* ================================================================== */

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

/* ================================================================== */
/*  Custom properties                                                  */
/* ================================================================== */

:root {
  /* Palette */
  --bg-base:        #0d1117;
  --bg-surface:     #161b22;
  --bg-surface-alt: #1c2333;
  --bg-elevated:    #21262d;
  --border:         #30363d;
  --border-light:   #484f58;

  --text-primary:   #e6edf3;
  --text-secondary: #8b949e;
  --text-muted:     #656d76;

  --accent:         #58a6ff;
  --accent-hover:   #79c0ff;
  --accent-dim:     rgba(88,166,255,.15);
  --green:          #3fb950;
  --green-dim:      rgba(63,185,80,.15);
  --red:            #f85149;
  --red-dim:        rgba(248,81,73,.15);
  --orange:         #f0883e;
  --orange-dim:     rgba(240,136,62,.15);

  /* Layout splitter defaults (overridden by JS) */
  --slides-split:   62%;
  --content-split:  55%;
  --sidebar-width:  210px;

  /* Typography */
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono:  'JetBrains Mono', 'Cascadia Code', 'Fira Code', monospace;

  /* Transitions */
  --transition-fast: 120ms ease;
  --transition:      200ms ease;
}

/* ================================================================== */
/*  Reset & Base                                                       */
/* ================================================================== */

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

html, body {
  height: 100%;
  overflow: hidden;
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-base);
  -webkit-font-smoothing: antialiased;
}

/* ================================================================== */
/*  Scrollbar styling                                                  */
/* ================================================================== */

::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}
::-webkit-scrollbar-track {
  background: transparent;
}
::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 3px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--border-light);
}

/* ================================================================== */
/*  Landing screen                                                     */
/* ================================================================== */

#landing-screen {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100vh;
  padding: 2rem;
  text-align: center;
}

.landing-logo {
  font-size: 3rem;
  margin-bottom: .5rem;
  background: linear-gradient(135deg, var(--accent) 0%, #a371f7 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 700;
  letter-spacing: -1px;
}

.landing-subtitle {
  color: var(--text-secondary);
  font-size: 1.1rem;
  margin-bottom: 2.5rem;
  font-weight: 300;
}

#drop-zone {
  position: relative;
  width: 420px;
  max-width: 90vw;
  padding: 3rem 2rem;
  border: 2px dashed var(--border);
  border-radius: 16px;
  background: var(--bg-surface);
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition),
              box-shadow var(--transition);
}

#drop-zone:hover,
#drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-dim);
  box-shadow: 0 0 30px rgba(88,166,255,.08);
}

.drop-icon {
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
  opacity: .7;
}

.drop-text {
  color: var(--text-secondary);
  font-size: .95rem;
  margin-bottom: 1.2rem;
}

.drop-text strong {
  color: var(--accent);
}

#pdf-input {
  display: none;
}

.file-btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  padding: .65rem 1.5rem;
  border: 1px solid var(--accent);
  border-radius: 8px;
  background: var(--accent-dim);
  color: var(--accent);
  font-family: var(--font-sans);
  font-size: .9rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}

.file-btn:hover {
  background: var(--accent);
  color: var(--bg-base);
}

.landing-footer {
  margin-top: 2rem;
  color: var(--text-muted);
  font-size: .78rem;
}

/* ================================================================== */
/*  Presenter view — grid layout                                       */
/* ================================================================== */

#presenter-view {
  display: none;          /* shown by JS */
  grid-template-columns: var(--sidebar-width) 6px 1fr;
  grid-template-rows: 1fr auto;
  height: 100vh;
  gap: 0;
}

/* ---- Thumbnail sidebar ---- */

#thumbnail-sidebar {
  grid-row: 1;
  grid-column: 1;
  background: var(--bg-surface);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

#sidebar-splitter {
  grid-row: 1;
  grid-column: 2;
}

.sidebar-header {
  padding: .4rem .6rem;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  gap: .35rem;
  cursor: pointer;
  transition: background var(--transition-fast);
}

.sidebar-header:hover {
  background: var(--bg-elevated);
}

/* Collapse button shared style */
.collapse-btn {
  width: 20px;
  height: 20px;
  border: none;
  border-radius: 3px;
  background: transparent;
  color: var(--text-muted);
  font-size: .65rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  padding: 0;
  flex-shrink: 0;
}

.collapse-btn:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

/* Sidebar collapsed */
#presenter-view.sidebar-collapsed {
  grid-template-columns: 34px 0px 1fr;
}

#presenter-view.sidebar-collapsed #sidebar-splitter {
  display: none;
}

#presenter-view.sidebar-collapsed #thumbnail-container {
  display: none;
}

#presenter-view.sidebar-collapsed .sidebar-header {
  writing-mode: vertical-rl;
  text-orientation: mixed;
  padding: .6rem .3rem;
  justify-content: flex-start;
  gap: .5rem;
}

#presenter-view.sidebar-collapsed #sidebar-collapse {
  transform: rotate(180deg);
}

#thumbnail-container {
  flex: 1;
  overflow-y: auto;
  padding: .5rem;
  display: flex;
  flex-direction: column;
  gap: .4rem;
}

/* ---- Main content area ---- */

#main-content {
  grid-row: 1;
  grid-column: 3;
  display: grid;
  grid-template-rows: var(--content-split) 6px 1fr;
  overflow: hidden;
  min-height: 0;
}

/* Notes collapsed: slides take all space, header stays visible */
#main-content.notes-collapsed {
  grid-template-rows: 1fr 0px 34px;
}

#main-content.notes-collapsed #content-splitter {
  display: none;
}

#main-content.notes-collapsed #notes-content {
  display: none;
}

#main-content.notes-collapsed #notes-zoom {
  display: none;
}

#main-content.notes-collapsed #notes-area {
  overflow: visible;
}

/* ---- Slides area (current + next) ---- */

#slides-area {
  display: grid;
  grid-template-columns: var(--slides-split) 6px 1fr;
  overflow: hidden;
  min-height: 0;
}

#current-slide-container,
#next-slide-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px;
  overflow: hidden;
  min-width: 0;
  min-height: 0;
  position: relative;
}

#current-slide-container {
  background: var(--bg-base);
}

#next-slide-container {
  background: var(--bg-surface-alt);
}

.section-label {
  position: absolute;
  top: 6px;
  left: 10px;
  right: 10px;
  font-size: .7rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--text-muted);
  pointer-events: none;
  z-index: 2;
}

#next-slide-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  pointer-events: auto;
  cursor: pointer;
}

#next-slide-header:hover {
  color: var(--text-secondary);
}

/* Next slide collapsed */
#slides-area.next-collapsed {
  grid-template-columns: 1fr 0px 0px;
}

#slides-area.next-collapsed #slides-splitter {
  display: none;
}

#slides-area.next-collapsed #next-slide-container {
  display: none;
}

#current-slide-canvas,
#next-slide-canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 4px;
  box-shadow: 0 2px 12px rgba(0,0,0,.35);
}

/* ---- Notes area ---- */

#notes-area {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
}

#notes-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: .45rem .75rem;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  cursor: pointer;
}

#notes-header-left {
  display: flex;
  align-items: center;
  gap: .4rem;
}

#notes-header-left span {
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .05em;
  color: var(--text-secondary);
}

#notes-collapse {
  width: 22px;
  height: 22px;
  border: none;
  border-radius: 4px;
  background: transparent;
  color: var(--text-muted);
  font-size: .7rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  padding: 0;
  min-width: 0;
  min-height: 0;
}

#notes-collapse:hover {
  color: var(--accent);
  background: var(--accent-dim);
}

#main-content.notes-collapsed #notes-collapse {
  transform: rotate(-90deg);
}

#main-content.notes-collapsed #notes-header {
  border-bottom: none;
}

#main-content.notes-collapsed #notes-header:hover {
  background: var(--accent-dim);
}

#notes-header:hover {
  background: var(--bg-elevated);
}

#notes-zoom {
  display: flex;
  gap: 2px;
}

#notes-zoom button {
  width: 26px;
  height: 26px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-size: .85rem;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

#notes-zoom button:hover {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}

#notes-content {
  flex: 1;
  overflow: auto;
  padding: .75rem;
  display: flex;
  align-items: flex-start;
  justify-content: center;
}

#notes-canvas {
  max-width: 100%;
  border-radius: 4px;
}

#notes-placeholder {
  color: var(--text-muted);
  font-style: italic;
  font-size: .9rem;
  text-align: center;
  padding-top: 2rem;
}

/* ================================================================== */
/*  Splitters (drag handles)                                           */
/* ================================================================== */

.splitter-v,
#slides-splitter {
  background: var(--border);
  cursor: col-resize;
  position: relative;
  transition: background var(--transition-fast);
  z-index: 10;
}

.splitter-h,
#content-splitter {
  background: var(--border);
  cursor: row-resize;
  position: relative;
  transition: background var(--transition-fast);
  z-index: 10;
}

.splitter-v:hover, .splitter-v.active,
#slides-splitter:hover, #slides-splitter.active {
  background: var(--accent);
}

.splitter-h:hover, .splitter-h.active,
#content-splitter:hover, #content-splitter.active {
  background: var(--accent);
}

body.resizing {
  cursor: col-resize;
  user-select: none;
}

body.resizing * {
  pointer-events: none !important;
}

body.resizing .splitter-v,
body.resizing .splitter-h,
body.resizing #slides-splitter,
body.resizing #content-splitter {
  pointer-events: auto !important;
}

/* ================================================================== */
/*  Bottom bar                                                         */
/* ================================================================== */

#bottom-bar {
  grid-row: 2;
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: .5rem 1rem;
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  flex-wrap: wrap;
  z-index: 20;
}

/* ---- Clock ---- */

#clock-display {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 500;
  color: var(--text-primary);
  min-width: 80px;
}

/* ---- Timer ---- */

#timer-section {
  display: flex;
  align-items: center;
  gap: .35rem;
  padding: 0 .75rem;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

#timer-display {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 500;
  color: var(--green);
  min-width: 56px;
  transition: color var(--transition);
}

#timer-display.over-target {
  color: var(--red);
  animation: pulse-red 1s infinite;
}

@keyframes pulse-red {
  0%, 100% { opacity: 1; }
  50%      { opacity: .6; }
}

#timer-target {
  width: 52px;
  padding: .3rem .35rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: .8rem;
  text-align: center;
}

#timer-target::placeholder {
  color: var(--text-muted);
}

/* ---- Navigation ---- */

#nav-section {
  display: flex;
  align-items: center;
  gap: .35rem;
}

#page-indicator {
  font-family: var(--font-mono);
  font-size: .9rem;
  color: var(--text-secondary);
  min-width: 60px;
  text-align: center;
}

#slide-jump {
  width: 48px;
  padding: .3rem .35rem;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: .8rem;
  text-align: center;
}

#slide-jump::placeholder {
  color: var(--text-muted);
}

/* ---- Actions ---- */

#actions-section {
  display: flex;
  align-items: center;
  gap: .4rem;
  margin-left: auto;
}

/* ================================================================== */
/*  Buttons (shared)                                                   */
/* ================================================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .35rem;
  padding: .4rem .75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg-elevated);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: .82rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.btn:hover {
  background: var(--accent-dim);
  color: var(--accent);
  border-color: var(--accent);
}

.btn.primary {
  background: var(--accent);
  color: var(--bg-base);
  border-color: var(--accent);
}

.btn.primary:hover {
  background: var(--accent-hover);
}

.btn.presenting {
  background: var(--green-dim);
  color: var(--green);
  border-color: var(--green);
}

.btn.active {
  background: var(--red-dim);
  color: var(--red);
  border-color: var(--red);
}

.btn-icon {
  padding: .4rem;
  min-width: 32px;
  min-height: 32px;
}

/* ================================================================== */
/*  Thumbnails                                                         */
/* ================================================================== */

.thumbnail-item {
  position: relative;
  cursor: pointer;
  border: 2px solid transparent;
  border-radius: 6px;
  padding: 3px;
  transition: border-color var(--transition-fast), background var(--transition-fast);
  display: flex;
  flex-direction: column;
  align-items: center;
}

.thumbnail-item:hover {
  border-color: var(--border-light);
  background: var(--bg-elevated);
}

.thumbnail-item.active {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.thumbnail-canvas {
  width: 100%;
  border-radius: 3px;
}

.thumbnail-label {
  font-size: .7rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 2px;
}

.thumbnail-item.active .thumbnail-label {
  color: var(--accent);
}

/* ================================================================== */
/*  Modal (screen picker)                                              */
/* ================================================================== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn .15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.modal-panel {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
  width: 380px;
  max-width: 90vw;
  box-shadow: 0 8px 40px rgba(0,0,0,.5);
}

.modal-panel h3 {
  font-size: 1.05rem;
  margin-bottom: 1rem;
  font-weight: 600;
  color: var(--text-primary);
}

.screen-option-btn {
  display: block;
  width: 100%;
  padding: .65rem .75rem;
  margin-bottom: .4rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg-elevated);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: .88rem;
  text-align: left;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.screen-option-btn:hover {
  border-color: var(--accent);
  background: var(--accent-dim);
}

.modal-cancel-btn {
  display: block;
  width: 100%;
  padding: .55rem;
  margin-top: .6rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-sans);
  font-size: .85rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.modal-cancel-btn:hover {
  background: var(--bg-elevated);
  color: var(--text-primary);
}

/* ---- Help table ---- */

.help-table {
  width: 100%;
  border-collapse: collapse;
}

.help-table td {
  padding: .4rem .5rem;
  border-bottom: 1px solid var(--border);
  font-size: .88rem;
  color: var(--text-primary);
}

.help-table td:first-child {
  white-space: nowrap;
  color: var(--text-secondary);
}

kbd {
  display: inline-block;
  padding: .15rem .4rem;
  border: 1px solid var(--border-light);
  border-radius: 4px;
  background: var(--bg-elevated);
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--text-primary);
  line-height: 1.4;
  box-shadow: 0 1px 0 var(--border);
}

/* ================================================================== */
/*  Presentation window (presentation.html)                            */
/* ================================================================== */

.presentation-body {
  background: #000;
  overflow: hidden;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  user-select: none;
  -webkit-user-select: none;
}

#slide-canvas {
  max-width: 100vw;
  max-height: 100vh;
  object-fit: contain;
}

#blackout-overlay {
  position: fixed;
  inset: 0;
  background: #000;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity .3s ease;
}

#blackout-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

/* ================================================================== */
/*  Utility                                                            */
/* ================================================================== */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}