/* ══════════════════════════════════════════════════════════════
   MyCloud — Design System & Application Styles
   CSS Custom Properties: --mc-*
   ══════════════════════════════════════════════════════════════ */

/* ─── Design Tokens ──────────────────────────────────────────── */
:root {
  --mc-primary:        #0068FF;
  --mc-primary-hover:  #0054CC;
  --mc-primary-light:  #E5EFFF;
  --mc-primary-dim:    rgba(0, 104, 255, 0.12);
  --mc-danger:         #E53E3E;
  --mc-danger-hover:   #C53030;
  --mc-success:        #38A169;

  --mc-bg:             #F0F2F5;
  --mc-surface:        #FFFFFF;
  --mc-surface-2:      #F7F9FC;
  --mc-border:         #E2E8F0;
  --mc-border-strong:  #CBD5E0;

  --mc-text:           #1A202C;
  --mc-text-secondary: #4A5568;
  --mc-text-muted:     #718096;
  --mc-text-link:      #0068FF;

  --mc-bubble-bg:      #FFFFFF;
  --mc-bubble-border:  #E8EFF8;
  --mc-bubble-shadow:  0 1px 4px rgba(0,0,0,0.07), 0 2px 12px rgba(0,0,0,0.04);

  --mc-header-bg:      #FFFFFF;
  --mc-header-shadow:  0 1px 0 var(--mc-border), 0 2px 8px rgba(0,0,0,0.04);
  --mc-footer-bg:      #FFFFFF;
  --mc-footer-shadow:  0 -1px 0 var(--mc-border), 0 -2px 8px rgba(0,0,0,0.04);

  --mc-radius-xs:  4px;
  --mc-radius-sm:  8px;
  --mc-radius-md:  12px;
  --mc-radius-lg:  18px;
  --mc-radius-xl:  24px;

  --mc-font: 'Be Vietnam Pro', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --mc-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', monospace;

  --mc-header-h:  56px;
  --mc-footer-h:  72px;
  --mc-max-w:     720px;

  --mc-transition: 0.18s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ─── Reset & Base ───────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { height: 100%; }

body {
  font-family: var(--mc-font);
  font-size: 15px;
  line-height: 1.55;
  color: var(--mc-text);
  background: var(--mc-bg);
  height: 100%;
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

[v-cloak] { display: none; }

#app {
  display: flex;
  flex-direction: column;
  height: 100dvh;
  max-width: var(--mc-max-w);
  margin: 0 auto;
  position: relative;
  background: var(--mc-surface);
  box-shadow: 0 0 40px rgba(0,0,0,0.08);
}

/* ─── Header ──────────────────────────────────────────────────── */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--mc-header-h);
  background: var(--mc-header-bg);
  box-shadow: var(--mc-header-shadow);
  display: flex;
  align-items: center;
  padding: 0 12px;
  flex-shrink: 0;
  transition: background var(--mc-transition);
}

.header-main,
.header-search {
  display: flex;
  align-items: center;
  width: 100%;
  gap: 8px;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}

.header-logo {
  font-size: 22px;
  line-height: 1;
}

.header-title {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--mc-text);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 4px;
}

/* Search input in header */
.header-search {
  gap: 8px;
}

.search-input {
  flex: 1;
  border: none;
  outline: none;
  font-size: 15px;
  font-family: var(--mc-font);
  background: transparent;
  color: var(--mc-text);
}

.search-input::placeholder { color: var(--mc-text-muted); }

/* ─── Search Results Panel ────────────────────────────────────── */
.search-results-panel {
  position: absolute;
  top: var(--mc-header-h);
  left: 0; right: 0;
  z-index: 90;
  background: var(--mc-surface);
  border-bottom: 1px solid var(--mc-border);
  max-height: 340px;
  overflow-y: auto;
  box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.search-results-header {
  padding: 8px 16px;
  font-size: 12px;
  font-weight: 600;
  color: var(--mc-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--mc-border);
}

.search-result-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background var(--mc-transition);
}

.search-result-item:hover { background: var(--mc-surface-2); }

.search-result-icon {
  font-size: 20px;
  flex-shrink: 0;
  margin-top: 1px;
}

.search-result-text {
  font-size: 14px;
  color: var(--mc-text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result-meta {
  font-size: 12px;
  color: var(--mc-text-muted);
  margin-top: 2px;
}

.search-empty {
  position: absolute;
  top: var(--mc-header-h);
  left: 0; right: 0;
  z-index: 90;
  padding: 24px 16px;
  text-align: center;
  color: var(--mc-text-muted);
  background: var(--mc-surface);
  border-bottom: 1px solid var(--mc-border);
  font-size: 14px;
}

/* ─── Chat Feed ───────────────────────────────────────────────── */
.chat-feed {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  scroll-behavior: smooth;
  position: relative;
  background: var(--mc-bg);
}

.chat-feed.dragging {
  background: var(--mc-primary-dim);
  outline: 2px dashed var(--mc-primary);
  outline-offset: -4px;
}

.drag-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10;
  pointer-events: none;
}

.drag-hint {
  background: var(--mc-primary);
  color: #fff;
  padding: 16px 32px;
  border-radius: var(--mc-radius-xl);
  font-size: 18px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(0, 104, 255, 0.4);
}

/* ─── Bubbles ─────────────────────────────────────────────────── */
.bubble-wrapper {
  display: flex;
  justify-content: flex-end;
  transition: background var(--mc-transition);
  border-radius: var(--mc-radius-md);
}

.bubble-wrapper.highlighted {
  animation: highlight-flash 1.5s ease;
}

@keyframes highlight-flash {
  0%, 100% { background: transparent; }
  30% { background: rgba(0, 104, 255, 0.15); }
}

.bubble {
  max-width: 82%;
  background: var(--mc-bubble-bg);
  border: 1px solid var(--mc-bubble-border);
  border-radius: var(--mc-radius-lg) var(--mc-radius-lg) var(--mc-radius-xs) var(--mc-radius-lg);
  padding: 10px 14px;
  box-shadow: var(--mc-bubble-shadow);
  position: relative;
  word-break: break-word;
  transition: box-shadow var(--mc-transition);
}

.bubble:hover { box-shadow: 0 2px 12px rgba(0,0,0,0.1), 0 4px 24px rgba(0,0,0,0.06); }
.bubble:hover .btn-delete { opacity: 1; }

/* Text bubble */
.bubble-text {
  font-size: 15px;
  line-height: 1.6;
  white-space: pre-wrap;
}

.bubble-text a {
  color: var(--mc-text-link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* Image bubble */
.bubble-image {
  display: block;
  max-width: 100%;
  max-height: 320px;
  border-radius: var(--mc-radius-md);
  object-fit: cover;
  cursor: zoom-in;
  transition: transform var(--mc-transition), opacity var(--mc-transition);
}

.bubble-image:hover { transform: scale(1.01); }

/* PDF preview */
.pdf-preview { display: flex; flex-direction: column; gap: 8px; }
.pdf-iframe {
  width: 100%;
  height: 380px;
  border: none;
  border-radius: var(--mc-radius-md);
  background: #f5f5f5;
}

.pdf-actions { display: flex; gap: 8px; }

/* File card */
.file-card {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 4px 0;
}

.file-icon {
  font-size: 32px;
  flex-shrink: 0;
}

.file-info {
  flex: 1;
  min-width: 0;
}

.file-name {
  font-size: 14px;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-meta {
  font-size: 12px;
  color: var(--mc-text-muted);
}

.file-caption {
  font-size: 13px;
  color: var(--mc-text-secondary);
  margin-top: 2px;
}

/* Caption */
.bubble-caption {
  font-size: 13px;
  color: var(--mc-text-secondary);
  margin-bottom: 6px;
}

/* Bubble footer */
.bubble-footer {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-top: 6px;
  flex-wrap: wrap;
}

.bubble-device {
  font-size: 11px;
  color: var(--mc-primary);
  font-weight: 500;
  background: var(--mc-primary-light);
  padding: 1px 6px;
  border-radius: var(--mc-radius-xs);
}

.bubble-time {
  font-size: 11px;
  color: var(--mc-text-muted);
  margin-left: auto;
}

.btn-delete {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  padding: 2px 4px;
  border-radius: var(--mc-radius-xs);
  opacity: 0;
  transition: opacity var(--mc-transition), background var(--mc-transition);
  color: var(--mc-danger);
  line-height: 1;
}

.btn-delete:hover { background: rgba(229, 62, 62, 0.1); opacity: 1; }

/* ─── Load indicators ─────────────────────────────────────────── */
.load-more-indicator {
  display: flex;
  justify-content: center;
  padding: 16px 0;
}

.spinner {
  width: 24px;
  height: 24px;
  border: 3px solid var(--mc-border);
  border-top-color: var(--mc-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

@keyframes spin { to { transform: rotate(360deg); } }

.no-more-hint {
  text-align: center;
  font-size: 12px;
  color: var(--mc-text-muted);
  padding: 12px 0 4px;
}

/* ─── Load New Bar ────────────────────────────────────────────── */
.load-new-bar {
  position: sticky;
  bottom: var(--mc-footer-h);
  z-index: 80;
  display: flex;
  justify-content: center;
  padding: 8px;
  pointer-events: none;
}

.btn-load-new {
  background: var(--mc-primary);
  color: #fff;
  border: none;
  border-radius: var(--mc-radius-xl);
  padding: 8px 20px;
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0,104,255,0.35);
  pointer-events: all;
  transition: transform var(--mc-transition), box-shadow var(--mc-transition);
  font-family: var(--mc-font);
}

.btn-load-new:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(0,104,255,0.45);
}

/* ─── Empty State ─────────────────────────────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  flex: 1;
  text-align: center;
  padding: 40px 24px;
  gap: 12px;
  min-height: 300px;
}

.empty-icon { font-size: 56px; opacity: 0.6; }
.empty-title { font-size: 20px; font-weight: 700; color: var(--mc-text); }
.empty-sub { font-size: 14px; color: var(--mc-text-muted); max-width: 260px; }

/* ─── Input Bar ───────────────────────────────────────────────── */
.input-bar {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 10px 12px;
  background: var(--mc-footer-bg);
  box-shadow: var(--mc-footer-shadow);
  flex-shrink: 0;
  min-height: var(--mc-footer-h);
}

.msg-textarea {
  flex: 1;
  border: 1.5px solid var(--mc-border);
  border-radius: var(--mc-radius-xl);
  padding: 10px 16px;
  font-size: 15px;
  font-family: var(--mc-font);
  line-height: 1.5;
  resize: none;
  outline: none;
  background: var(--mc-surface-2);
  color: var(--mc-text);
  transition: border-color var(--mc-transition), box-shadow var(--mc-transition);
  max-height: 160px;
  overflow-y: auto;
}

.msg-textarea::placeholder { color: var(--mc-text-muted); }
.msg-textarea:focus {
  border-color: var(--mc-primary);
  box-shadow: 0 0 0 3px var(--mc-primary-dim);
  background: var(--mc-surface);
}

.btn-send {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--mc-primary);
  color: #fff;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: background var(--mc-transition), transform var(--mc-transition), box-shadow var(--mc-transition);
  box-shadow: 0 2px 8px rgba(0,104,255,0.3);
}

.btn-send:hover {
  background: var(--mc-primary-hover);
  transform: scale(1.05);
  box-shadow: 0 4px 16px rgba(0,104,255,0.4);
}

.btn-send:disabled {
  background: var(--mc-border-strong);
  box-shadow: none;
  transform: none;
  cursor: not-allowed;
}

/* ─── Upload Progress Bar ─────────────────────────────────────── */
.upload-progress-bar {
  position: fixed;
  bottom: var(--mc-footer-h);
  left: 50%;
  transform: translateX(-50%);
  width: min(100%, var(--mc-max-w));
  height: 4px;
  background: var(--mc-border);
  z-index: 200;
  overflow: hidden;
  display: flex;
  align-items: center;
}

.upload-progress-fill {
  height: 100%;
  background: var(--mc-primary);
  transition: width 0.3s ease;
}

.upload-label {
  position: absolute;
  right: 12px;
  font-size: 11px;
  font-weight: 600;
  color: var(--mc-primary);
}

/* ─── Lightbox ────────────────────────────────────────────────── */
.lightbox {
  position: fixed;
  inset: 0;
  z-index: 1000;
  background: rgba(0,0,0,0.92);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  animation: fade-in 0.2s ease;
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.lightbox-toolbar {
  position: absolute;
  top: 0; left: 0; right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background: linear-gradient(to bottom, rgba(0,0,0,0.6), transparent);
}

.lightbox-name {
  color: rgba(255,255,255,0.85);
  font-size: 13px;
  font-weight: 500;
  max-width: 60%;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.lightbox-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.lightbox-img {
  max-width: 96vw;
  max-height: 88dvh;
  object-fit: contain;
  border-radius: var(--mc-radius-md);
  animation: scale-in 0.25s cubic-bezier(0.34, 1.56, 0.64, 1);
}

@keyframes scale-in {
  from { transform: scale(0.88); opacity: 0; }
  to   { transform: scale(1); opacity: 1; }
}

/* ─── Modal ───────────────────────────────────────────────────── */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 900;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
  animation: fade-in 0.15s ease;
}

.modal {
  background: var(--mc-surface);
  border-radius: var(--mc-radius-xl);
  padding: 28px 24px;
  width: 100%;
  max-width: 380px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  animation: scale-in 0.2s cubic-bezier(0.34, 1.56, 0.64, 1);
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-title {
  font-size: 18px;
  font-weight: 700;
}

.modal-desc {
  font-size: 14px;
  color: var(--mc-text-secondary);
  margin-top: -8px;
}

.modal-actions {
  display: flex;
  gap: 10px;
  justify-content: flex-end;
}

/* ─── Dropdown ────────────────────────────────────────────────── */
.dropdown { position: relative; }

.dropdown-menu {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  background: var(--mc-surface);
  border: 1px solid var(--mc-border);
  border-radius: var(--mc-radius-md);
  box-shadow: 0 8px 24px rgba(0,0,0,0.12);
  min-width: 180px;
  z-index: 200;
  overflow: hidden;
  display: none;
  animation: dropdown-open 0.15s ease;
}

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

.dropdown.open .dropdown-menu { display: block; }

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 14px;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 14px;
  font-family: var(--mc-font);
  color: var(--mc-text);
  text-align: left;
  transition: background var(--mc-transition);
}

.dropdown-item:hover { background: var(--mc-surface-2); }
.dropdown-item.danger { color: var(--mc-danger); }
.dropdown-item.danger:hover { background: rgba(229,62,62,0.06); }

.dropdown-divider {
  height: 1px;
  background: var(--mc-border);
  margin: 4px 0;
}

/* ─── Shared Buttons & Form Controls ─────────────────────────── */
.btn-icon {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: none;
  border: none;
  cursor: pointer;
  font-size: 18px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--mc-text-secondary);
  transition: background var(--mc-transition), color var(--mc-transition);
  flex-shrink: 0;
  line-height: 1;
}

.btn-icon [class^="icon-"],
.btn-icon [class*=" icon-"] {
  font-size: 19px;
  line-height: 1;
}

.btn-send [class^="icon-"],
.btn-send [class*=" icon-"] {
  font-size: 20px;
  margin-left: 2px;
  line-height: 1;
}

.dropdown-item [class^="icon-"],
.dropdown-item [class*=" icon-"] {
  font-size: 17px;
  color: var(--mc-text-secondary);
}

.dropdown-item.danger [class^="icon-"],
.dropdown-item.danger [class*=" icon-"] {
  color: var(--mc-danger);
}

.file-icon [class^="icon-"],
.file-icon [class*=" icon-"] {
  font-size: 28px;
  color: var(--mc-primary);
}

.empty-icon [class^="icon-"],
.empty-icon [class*=" icon-"] {
  font-size: 48px;
  color: var(--mc-primary);
  opacity: 0.6;
}

.btn-icon.spinning {
  animation: spin 0.6s linear infinite;
  pointer-events: none;
}

.btn-icon:hover { background: var(--mc-surface-2); color: var(--mc-text); }

.btn-sm {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 5px 12px;
  border-radius: var(--mc-radius-sm);
  font-size: 12px;
  font-weight: 600;
  font-family: var(--mc-font);
  background: var(--mc-surface-2);
  border: 1px solid var(--mc-border);
  color: var(--mc-text);
  cursor: pointer;
  text-decoration: none;
  transition: background var(--mc-transition), border-color var(--mc-transition);
}

.btn-sm:hover { background: var(--mc-border); }
.btn-sm.btn-light { background: rgba(255,255,255,0.15); border-color: rgba(255,255,255,0.25); color: #fff; }
.btn-sm.btn-light:hover { background: rgba(255,255,255,0.25); }

.btn-primary {
  padding: 10px 20px;
  background: var(--mc-primary);
  color: #fff;
  border: none;
  border-radius: var(--mc-radius-sm);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--mc-font);
  cursor: pointer;
  transition: background var(--mc-transition), transform var(--mc-transition);
}

.btn-primary:hover { background: var(--mc-primary-hover); transform: translateY(-1px); }

.btn-secondary {
  padding: 10px 20px;
  background: var(--mc-surface-2);
  color: var(--mc-text);
  border: 1px solid var(--mc-border);
  border-radius: var(--mc-radius-sm);
  font-size: 14px;
  font-weight: 600;
  font-family: var(--mc-font);
  cursor: pointer;
  transition: background var(--mc-transition);
}

.btn-secondary:hover { background: var(--mc-border); }

.btn-full { width: 100%; }

.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--mc-text-secondary);
  margin-bottom: 6px;
}

.form-input {
  width: 100%;
  padding: 10px 14px;
  border: 1.5px solid var(--mc-border);
  border-radius: var(--mc-radius-sm);
  font-size: 15px;
  font-family: var(--mc-font);
  color: var(--mc-text);
  background: var(--mc-surface-2);
  outline: none;
  transition: border-color var(--mc-transition), box-shadow var(--mc-transition);
}

.form-input:focus {
  border-color: var(--mc-primary);
  box-shadow: 0 0 0 3px var(--mc-primary-dim);
  background: var(--mc-surface);
}

.form-group { display: flex; flex-direction: column; }

/* ─── Login Page ──────────────────────────────────────────────── */
.login-body {
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100dvh;
  background: linear-gradient(135deg, #f0f4ff 0%, #e8f2ff 50%, #f5f0ff 100%);
}

.login-container {
  width: 100%;
  max-width: 380px;
  padding: 16px;
}

.login-card {
  background: var(--mc-surface);
  border-radius: var(--mc-radius-xl);
  padding: 36px 28px;
  box-shadow: 0 8px 40px rgba(0,0,0,0.08), 0 1px 3px rgba(0,0,0,0.06);
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.login-logo {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.login-logo-icon { font-size: 52px; }

.login-title {
  font-size: 26px;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--mc-text);
}

.login-subtitle {
  font-size: 14px;
  color: var(--mc-text-muted);
}

.login-error {
  background: #fff5f5;
  border: 1px solid #fed7d7;
  color: var(--mc-danger);
  border-radius: var(--mc-radius-sm);
  padding: 10px 14px;
  font-size: 13px;
  font-weight: 500;
  display: flex;
  align-items: center;
  gap: 6px;
}

.login-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* ─── Scrollbar ───────────────────────────────────────────────── */
.chat-feed::-webkit-scrollbar { width: 5px; }
.chat-feed::-webkit-scrollbar-track { background: transparent; }
.chat-feed::-webkit-scrollbar-thumb {
  background: var(--mc-border-strong);
  border-radius: 9px;
}

/* ─── Responsive ──────────────────────────────────────────────── */
@media (max-width: 480px) {
  .bubble { max-width: 92%; }
  .pdf-iframe { height: 260px; }
}