:root {
  --obsidian: #101114;
  --graphite: #191B20;
  --crystal: #DDE2E8;
  --ice: #F5F7FA;
  --titanium: #858C98;
  --champagne: #C6AD83;

  --bg-0: #0B0C0F;
  --bg-1: #101114;
  --bg-2: #191B20;
  --bg-3: #22252C;

  --glass-bg: rgba(255,255,255,0.06);
  --glass-bg-strong: rgba(255,255,255,0.10);
  --glass-border: rgba(255,255,255,0.12);
  --glass-border-strong: rgba(255,255,255,0.22);
  --glass-highlight: rgba(255,255,255,0.18);

  --text-0: #F5F7FA;
  --text-1: #DDE2E8;
  --text-2: #A8AFB9;
  --text-3: #858C98;

  --accent: #C6AD83;
  --accent-soft: rgba(198,173,131,0.18);
  --danger: #E06B6B;
  --success: #6FCF97;
  --warning: #E8C16B;

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

  --blur: 14px;
  --blur-strong: 24px;

  --shadow-soft: 0 8px 32px rgba(0,0,0,0.35);
  --shadow-glass: 0 1px 0 rgba(255,255,255,0.06) inset, 0 8px 32px rgba(0,0,0,0.4);
  --shadow-lift: 0 12px 40px rgba(0,0,0,0.5);

  --font: "Inter", "SF Pro Display", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;

  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 220ms;
}

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

html, body { height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg-0);
  color: var(--text-0);
  overflow: hidden;
  -webkit-font-smoothing: antialiased;
}

/* Background ambient */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: -2;
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(198,173,131,0.10), transparent 60%),
    radial-gradient(900px 600px at 100% 10%, rgba(221,226,232,0.06), transparent 60%),
    radial-gradient(800px 600px at 50% 110%, rgba(25,27,32,0.9), transparent 70%),
    linear-gradient(180deg, #0B0C0F 0%, #101114 100%);
}
body::after {
  content: "";
  position: fixed; inset: 0; z-index: -1;
  background-image: radial-gradient(rgba(255,255,255,0.04) 1px, transparent 1px);
  background-size: 28px 28px;
  opacity: 0.35;
  pointer-events: none;
}

/* Glass */
.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(var(--blur)) saturate(120%);
  -webkit-backdrop-filter: blur(var(--blur)) saturate(120%);
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-lg);
}
.glass-strong {
  background: var(--glass-bg-strong);
  backdrop-filter: blur(var(--blur-strong)) saturate(130%);
  -webkit-backdrop-filter: blur(var(--blur-strong)) saturate(130%);
  border: 1px solid var(--glass-border-strong);
  box-shadow: var(--shadow-glass);
  border-radius: var(--radius-lg);
}

/* Layout */
.app { display: grid; grid-template-columns: 260px 1fr; grid-template-rows: 64px 1fr; height: 100vh; }

.topbar {
  grid-column: 1 / -1;
  display: flex; align-items: center; gap: 16px;
  padding: 0 20px;
  border-bottom: 1px solid var(--glass-border);
  background: rgba(16,17,20,0.55);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  z-index: 5;
}
.logo { display: flex; align-items: center; gap: 10px; font-weight: 600; letter-spacing: 0.3px; }
.logo-mark {
  width: 30px; height: 30px; border-radius: 9px;
  background: linear-gradient(135deg, var(--crystal), var(--champagne));
  box-shadow: 0 0 0 1px rgba(255,255,255,0.15) inset, 0 6px 16px rgba(198,173,131,0.25);
  position: relative;
}
.logo-mark::after {
  content: ""; position: absolute; inset: 6px; border-radius: 5px;
  background: var(--bg-1);
}
.searchbar {
  flex: 1; max-width: 560px; margin: 0 auto;
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 999px;
  backdrop-filter: blur(10px);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}
.searchbar:focus-within { border-color: var(--glass-border-strong); background: var(--glass-bg-strong); }
.searchbar input { background: transparent; border: none; outline: none; color: var(--text-0); width: 100%; font-size: 14px; }
.searchbar svg { color: var(--text-3); flex-shrink: 0; }

.topbar-actions { display: flex; align-items: center; gap: 8px; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  color: var(--text-1); cursor: pointer;
  transition: all var(--dur) var(--ease);
}
.icon-btn:hover { background: var(--glass-bg-strong); border-color: var(--glass-border-strong); color: var(--text-0); transform: translateY(-1px); }

.avatar {
  width: 36px; height: 36px; border-radius: 50%;
  background: linear-gradient(135deg, var(--champagne), #8a7350);
  display: grid; place-items: center; font-weight: 600; color: #1a1610;
  border: 1px solid var(--glass-border-strong);
}

/* Sidebar */
.sidebar {
  padding: 18px 14px;
  border-right: 1px solid var(--glass-border);
  background: rgba(16,17,20,0.4);
  backdrop-filter: blur(12px);
  display: flex; flex-direction: column; gap: 6px;
  overflow-y: auto;
}
.nav-section { margin-top: 14px; font-size: 11px; letter-spacing: 1.2px; color: var(--text-3); text-transform: uppercase; padding: 0 10px; }
.nav-item {
  display: flex; align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  color: var(--text-1); font-size: 14px; cursor: pointer;
  transition: all var(--dur) var(--ease);
  border: 1px solid transparent;
}
.nav-item:hover { background: var(--glass-bg); color: var(--text-0); }
.nav-item.active {
  background: var(--glass-bg-strong);
  border-color: var(--glass-border);
  color: var(--text-0);
}
.nav-item svg { width: 18px; height: 18px; color: var(--text-2); }
.nav-item.active svg { color: var(--accent); }

.upload-btn {
  display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 12px 16px; border-radius: 12px;
  background: linear-gradient(135deg, var(--crystal), var(--champagne));
  color: #1a1610; font-weight: 600; font-size: 14px;
  border: none; cursor: pointer;
  box-shadow: 0 8px 24px rgba(198,173,131,0.25);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.upload-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(198,173,131,0.35); }

.storage-card {
  margin-top: auto;
  padding: 14px; border-radius: 12px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}
.storage-bar { height: 6px; border-radius: 999px; background: rgba(255,255,255,0.08); overflow: hidden; margin: 10px 0 6px; }
.storage-bar > div { height: 100%; background: linear-gradient(90deg, var(--accent), var(--crystal)); border-radius: 999px; transition: width 600ms var(--ease); }
.storage-text { font-size: 12px; color: var(--text-2); }

/* Main */
.main { padding: 24px 28px; overflow-y: auto; display: flex; flex-direction: column; gap: 20px; }

.breadcrumb { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--text-2); }
.breadcrumb span { cursor: pointer; padding: 4px 8px; border-radius: 6px; transition: background var(--dur); }
.breadcrumb span:hover { background: var(--glass-bg); color: var(--text-0); }
.breadcrumb .sep { color: var(--text-3); }

.toolbar { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.toolbar .spacer { flex: 1; }
.view-toggle { display: flex; background: var(--glass-bg); border: 1px solid var(--glass-border); border-radius: 10px; padding: 3px; }
.view-toggle button { background: transparent; border: none; color: var(--text-2); padding: 6px 10px; border-radius: 7px; cursor: pointer; transition: all var(--dur); }
.view-toggle button.active { background: var(--glass-bg-strong); color: var(--text-0); }

/* Stats */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 14px; }
.stat {
  padding: 18px; border-radius: 14px;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  backdrop-filter: blur(10px);
  transition: transform var(--dur) var(--ease), border-color var(--dur);
}
.stat:hover { transform: translateY(-2px); border-color: var(--glass-border-strong); }
.stat-label { font-size: 12px; color: var(--text-2); letter-spacing: 0.4px; }
.stat-value { font-size: 26px; font-weight: 600; margin-top: 6px; letter-spacing: -0.5px; }
.stat-sub { font-size: 12px; color: var(--text-3); margin-top: 4px; }

/* File grid */
.files-header { display: flex; align-items: center; justify-content: space-between; }
.files-title { font-size: 18px; font-weight: 600; letter-spacing: -0.3px; }

.grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 12px;
}
.file-card {
  padding: 14px; border-radius: 14px;
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  cursor: pointer; position: relative;
  transition: all var(--dur) var(--ease);
  display: flex; flex-direction: column; gap: 10px;
}
.file-card:hover { background: var(--glass-bg-strong); border-color: var(--glass-border-strong); transform: translateY(-2px); }
.file-card.selected { border-color: var(--accent); background: var(--accent-soft); }
.file-icon {
  width: 44px; height: 44px; border-radius: 10px;
  display: grid; place-items: center;
  background: var(--glass-bg-strong);
  border: 1px solid var(--glass-border);
  font-size: 20px;
}
.file-name { font-size: 13px; font-weight: 500; color: var(--text-0); word-break: break-word; line-height: 1.3; }
.file-meta { font-size: 11px; color: var(--text-3); }

.list-view { display: flex; flex-direction: column; gap: 4px; }
.list-row {
  display: grid; grid-template-columns: 36px 1fr 120px 100px 140px 40px;
  align-items: center; gap: 12px;
  padding: 10px 12px; border-radius: 10px;
  background: var(--glass-bg); border: 1px solid transparent;
  cursor: pointer; transition: all var(--dur);
}
.list-row:hover { background: var(--glass-bg-strong); border-color: var(--glass-border); }
.list-row.selected { border-color: var(--accent); background: var(--accent-soft); }

/* Modal */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 50;
  background: rgba(0,0,0,0.55);
  backdrop-filter: blur(6px);
  display: none; align-items: center; justify-content: center;
  animation: fadeIn var(--dur) var(--ease);
}
.modal-backdrop.open { display: flex; }
.modal {
  width: min(560px, 92vw); max-height: 80vh; overflow: auto;
  padding: 24px; border-radius: var(--radius-xl);
}
.modal-title { font-size: 18px; font-weight: 600; margin-bottom: 16px; }
.modal-actions { display: flex; gap: 8px; justify-content: flex-end; margin-top: 20px; }

.btn {
  padding: 9px 16px; border-radius: 10px; font-size: 13px; font-weight: 500;
  border: 1px solid var(--glass-border); background: var(--glass-bg); color: var(--text-0);
  cursor: pointer; transition: all var(--dur) var(--ease);
}
.btn:hover { background: var(--glass-bg-strong); border-color: var(--glass-border-strong); }
.btn.primary { background: linear-gradient(135deg, var(--crystal), var(--champagne)); color: #1a1610; border: none; font-weight: 600; }
.btn.primary:hover { transform: translateY(-1px); }
.btn.danger { color: var(--danger); border-color: rgba(224,107,107,0.3); }

/* Toast */
.toast-wrap { position: fixed; bottom: 24px; right: 24px; z-index: 60; display: flex; flex-direction: column; gap: 8px; }
.toast {
  padding: 12px 16px; border-radius: 12px;
  background: var(--glass-bg-strong); border: 1px solid var(--glass-border-strong);
  backdrop-filter: blur(16px);
  font-size: 13px; color: var(--text-0);
  box-shadow: var(--shadow-lift);
  animation: slideIn 280ms var(--ease);
}
.toast.success { border-left: 3px solid var(--success); }
.toast.error { border-left: 3px solid var(--danger); }

/* Drop zone */
.dropzone {
  border: 2px dashed var(--glass-border-strong);
  border-radius: 14px; padding: 32px; text-align: center;
  color: var(--text-2); transition: all var(--dur);
}
.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); color: var(--text-0); }

/* Mobile */
@media (max-width: 768px) {
  .app { grid-template-columns: 1fr; grid-template-rows: 56px 1fr 64px; }
  .sidebar { display: none; }
  .bottom-nav {
    grid-row: 3; display: flex; align-items: center; justify-content: space-around;
    border-top: 1px solid var(--glass-border);
    background: rgba(16,17,20,0.7); backdrop-filter: blur(16px);
  }
  .stats { grid-template-columns: repeat(2, 1fr); }
  .grid { grid-template-columns: repeat(2, 1fr); }
  .list-row { grid-template-columns: 32px 1fr 80px; }
  .list-row > :nth-child(3), .list-row > :nth-child(4), .list-row > :nth-child(5) { display: none; }
}
.bottom-nav { display: none; }
.bottom-nav .nav-item { flex-direction: column; gap: 2px; font-size: 10px; padding: 6px; }
.bottom-nav .nav-item svg { width: 20px; height: 20px; }
.mobile-upload-btn { display: none; }
@media (max-width: 768px) {
  .mobile-upload-btn { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 2px; min-width: 48px; border: 0; background: none; color: var(--text-2); font: inherit; font-size: 10px; padding: 6px; }
  .mobile-upload-btn svg { width: 20px; height: 20px; }
}

@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideIn { from { transform: translateY(12px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: 0.5; } }

.empty { text-align: center; padding: 60px 20px; color: var(--text-3); }
.empty svg { width: 64px; height: 64px; margin-bottom: 12px; opacity: 0.4; }
.loading { animation: pulse 1.2s infinite; }

input, select, textarea {
  background: var(--glass-bg); border: 1px solid var(--glass-border);
  color: var(--text-0); padding: 9px 12px; border-radius: 10px; font-size: 13px;
  outline: none; transition: border-color var(--dur);
}
input:focus, select:focus, textarea:focus { border-color: var(--glass-border-strong); }
.auth-screen { min-height: 100vh; min-height: 100dvh; width: 100%; display: grid; place-items: center; overflow-y: auto; padding: max(20px, env(safe-area-inset-top)) 16px max(20px, env(safe-area-inset-bottom)); }
.auth-card { width: min(420px, 100%); padding: clamp(20px, 6vw, 32px); }
.auth-tabs { display: flex; gap: 8px; margin-bottom: 16px; }
.auth-tabs .btn { flex: 1; min-height: 44px; }
.auth-form { display: grid; gap: 10px; }
.auth-form input { width: 100%; min-height: 46px; font-size: 16px; }
.auth-form .btn { width: 100%; min-height: 46px; margin-top: 2px; }
.auth-form .btn:disabled { opacity: .65; cursor: wait; }
::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.1); border-radius: 4px; }
::-webkit-scrollbar-track { background: transparent; }