/* KiloStash — Apple-style UI, fully responsive */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg: #000000;
  --surface: #1c1c1e;
  --surface-elevated: #2c2c2e;
  --surface-hover: #3a3a3c;
  --text: #ffffff;
  --text-secondary: rgba(235, 235, 245, 0.6);
  --text-tertiary: rgba(235, 235, 245, 0.3);
  --accent: #0a84ff;
  --accent-hover: #409cff;
  --danger: #ff453a;
  --success: #30d158;
  --separator: rgba(84, 84, 88, 0.65);
  --radius: 12px;
  --radius-lg: 18px;
  --radius-xl: 24px;
  --transition: 0.2s cubic-bezier(0.25, 0.1, 0.25, 1);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --font: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'SF Pro Text', 'Helvetica Neue', 'Segoe UI', Roboto, sans-serif;
}

html { font-size: 16px; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  min-height: 100dvh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

.hidden { display: none !important; }

/* ===== LOGIN ===== */
.login-screen {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: linear-gradient(180deg, #1a1a1c 0%, #000000 100%);
}

.login-card {
  width: 100%;
  max-width: 360px;
  text-align: center;
  animation: fadeUp 0.5s var(--transition);
}

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

.login-icon {
  color: var(--accent);
  margin-bottom: 16px;
}

.login-card h1 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 4px;
}

.login-subtitle {
  font-size: 15px;
  color: var(--text-secondary);
  margin-bottom: 32px;
}

.login-input {
  width: 100%;
  height: 50px;
  padding: 0 16px;
  border-radius: var(--radius);
  border: 1px solid var(--separator);
  background: var(--surface);
  color: var(--text);
  font-size: 16px;
  font-family: var(--font);
  outline: none;
  transition: border-color var(--transition);
  margin-bottom: 16px;
}

.login-input:focus { border-color: var(--accent); }

.login-error {
  color: var(--danger);
  font-size: 14px;
  margin-top: 12px;
  min-height: 20px;
}

/* ===== BUTTONS ===== */
.btn-primary {
  width: 100%;
  height: 50px;
  border-radius: var(--radius);
  border: none;
  background: var(--accent);
  color: white;
  font-size: 17px;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  transition: background var(--transition), transform var(--transition);
}

.btn-primary:active { transform: scale(0.98); background: var(--accent-hover); }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }

.btn-icon {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition), color var(--transition);
}

.btn-icon:hover { background: var(--surface-hover); color: var(--text); }
.btn-icon:active { transform: scale(0.95); }

/* ===== HEADER ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--separator);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.header-left { display: flex; align-items: center; gap: 8px; }
.header-logo { color: var(--accent); }
.header-left h2 { font-size: 19px; font-weight: 700; letter-spacing: -0.3px; }

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

.storage-info {
  font-size: 13px;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

/* ===== DROP ZONE ===== */
.drop-zone {
  max-width: 1200px;
  margin: 20px auto;
  padding: 0 20px;
}

.drop-zone-inner {
  border: 2px dashed var(--separator);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  color: var(--text-secondary);
}

.drop-zone-inner:hover,
.drop-zone.dragover .drop-zone-inner {
  border-color: var(--accent);
  background: rgba(10, 132, 255, 0.08);
  color: var(--accent);
}

.drop-zone-title { font-size: 17px; font-weight: 600; margin-top: 12px; }
.drop-zone-subtitle { font-size: 14px; color: var(--text-tertiary); margin-top: 4px; }
.file-input-hidden { display: none; }

/* ===== UPLOAD PROGRESS ===== */
.upload-progress {
  max-width: 1200px;
  margin: 0 auto 16px;
  padding: 0 20px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.upload-item {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  animation: fadeUp 0.3s var(--transition);
}

.upload-item-name { flex: 1; font-size: 14px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.upload-item-bar { width: 80px; height: 4px; background: var(--surface-elevated); border-radius: 2px; overflow: hidden; }
.upload-item-fill { height: 100%; background: var(--accent); border-radius: 2px; transition: width 0.3s; }
.upload-item-status { font-size: 13px; color: var(--text-secondary); min-width: 50px; text-align: right; }

/* ===== MAIN ===== */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px 60px;
}

.files-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 16px;
}

.files-header h3 { font-size: 22px; font-weight: 700; letter-spacing: -0.3px; }

.view-toggle { display: flex; gap: 4px; background: var(--surface); border-radius: 10px; padding: 3px; }

.view-btn {
  background: none;
  border: none;
  color: var(--text-secondary);
  cursor: pointer;
  padding: 6px;
  border-radius: 7px;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
}

.view-btn.active { background: var(--surface-elevated); color: var(--text); }

/* ===== EMPTY STATE ===== */
.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-tertiary);
}

.empty-title { font-size: 17px; font-weight: 600; margin-top: 16px; color: var(--text-secondary); }
.empty-subtitle { font-size: 14px; margin-top: 4px; }

/* ===== FILE GRID ===== */
.file-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 12px;
}

.file-card {
  background: var(--surface);
  border-radius: var(--radius);
  overflow: hidden;
  cursor: pointer;
  transition: transform var(--transition);
  animation: fadeUp 0.3s var(--transition);
  position: relative;
}

.file-card:active { transform: scale(0.97); }

.file-thumb {
  width: 100%;
  aspect-ratio: 1;
  background: var(--surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

.file-thumb img, .file-thumb video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.file-thumb-icon {
  color: var(--text-tertiary);
}

.file-card-info {
  padding: 8px 12px 10px;
}

.file-card-name {
  font-size: 13px;
  font-weight: 500;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.file-card-meta {
  font-size: 12px;
  color: var(--text-secondary);
  margin-top: 2px;
}

/* ===== FILE LIST ===== */
.file-list { display: flex; flex-direction: column; gap: 2px; }

.file-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 14px;
  background: var(--surface);
  border-radius: var(--radius);
  cursor: pointer;
  transition: background var(--transition);
  animation: fadeUp 0.3s var(--transition);
}

.file-row:hover { background: var(--surface-hover); }

.file-row-icon {
  width: 40px;
  height: 40px;
  background: var(--surface-elevated);
  border-radius: 9px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: var(--text-secondary);
}

.file-row-info { flex: 1; min-width: 0; }
.file-row-name { font-size: 15px; font-weight: 500; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-row-meta { font-size: 13px; color: var(--text-secondary); margin-top: 1px; }

/* ===== MODAL ===== */
.modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
}

.modal-content {
  position: relative;
  width: 100%;
  max-width: 900px;
  max-height: 90vh;
  max-height: 90dvh;
  margin: 20px;
  background: var(--surface);
  border-radius: var(--radius-xl);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  border-bottom: 0.5px solid var(--separator);
  flex-shrink: 0;
}

.modal-title { font-size: 16px; font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

.modal-body {
  flex: 1;
  overflow: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  min-height: 300px;
}

.modal-body img, .modal-body video {
  max-width: 100%;
  max-height: 70vh;
  max-height: 70dvh;
  border-radius: var(--radius);
}

.modal-body audio {
  width: 100%;
}

.modal-body .preview-file-icon {
  text-align: center;
  color: var(--text-tertiary);
}

.modal-body .preview-file-icon p { margin-top: 12px; font-size: 14px; color: var(--text-secondary); }

/* ===== ACTIONS MENU ===== */
.file-actions {
  position: absolute;
  top: 8px;
  right: 8px;
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity var(--transition);
}

.file-card:hover .file-actions { opacity: 1; }

.file-action-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
}

.file-action-btn:hover { background: rgba(0, 0, 0, 0.8); }
.file-action-btn.danger:hover { background: var(--danger); }

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .header-inner { padding: 10px 16px; }
  .header-left h2 { font-size: 17px; }
  .storage-info { display: none; }

  .drop-zone { margin: 16px auto; padding: 0 16px; }
  .drop-zone-inner { padding: 28px 16px; }

  .main { padding: 0 16px 40px; }

  .file-grid { grid-template-columns: repeat(auto-fill, minmax(110px, 1fr)); gap: 10px; }

  .file-card-name { font-size: 12px; }
  .file-card-meta { font-size: 11px; }

  .modal-content { margin: 0; border-radius: 0; max-height: 100vh; max-height: 100dvh; }
  .modal { padding: 0; }
  .modal-body { padding: 16px; }
}

@media (max-width: 380px) {
  .file-grid { grid-template-columns: repeat(2, 1fr); }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--surface-hover); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ===== LOADING ===== */
.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--surface-elevated);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

.loading-center {
  display: flex;
  justify-content: center;
  padding: 40px;
}