:root {
  --color-bg: #F8FAFC;
  --color-primary: #3730A3;
  --color-primary-hover: #2f2a86;
  --color-secondary: #6366F1;
  --color-tertiary: #F43F5E;
  --color-text: #1E293B;
  --color-text-muted: #64748B;
  --color-border: rgba(255, 255, 255, 0.5);
  --glass-bg: rgba(255, 255, 255, 0.6);
  --glass-bg-strong: rgba(255, 255, 255, 0.9);
  --radius-sm: 0.5rem;
  --radius-lg: 1rem;
  --radius-full: 9999px;
  --shadow-modal: 0 10px 30px rgba(30, 41, 59, 0.12);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font);
  background: var(--color-bg);
  color: var(--color-text);
  -webkit-font-smoothing: antialiased;
}

body {
  background-image:
    radial-gradient(circle at 10% 10%, rgba(99, 102, 241, 0.12), transparent 40%),
    radial-gradient(circle at 90% 30%, rgba(244, 63, 94, 0.08), transparent 40%);
  min-height: 100vh;
}

a { color: inherit; text-decoration: none; }
button { font-family: var(--font); cursor: pointer; }

/* ---------- Layout ---------- */
.app-shell {
  display: flex;
  min-height: 100vh;
}

.sidebar {
  width: 280px;
  flex-shrink: 0;
  padding: 24px 16px;
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.main-content {
  flex: 1;
  padding: 40px;
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
}

@media (max-width: 900px) {
  .app-shell { flex-direction: column; }
  .sidebar {
    width: 100%;
    flex-direction: row;
    overflow-x: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }
  .main-content { padding: 16px; }
}

/* ---------- Brand ---------- */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 20px;
  color: var(--color-primary);
  padding: 8px 12px 20px;
}
.brand .dot {
  width: 10px; height: 10px; border-radius: 50%;
  background: linear-gradient(135deg, var(--color-secondary), var(--color-tertiary));
}

/* ---------- Nav ---------- */
.nav-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  white-space: nowrap;
}
.nav-item:hover { background: rgba(99, 102, 241, 0.08); color: var(--color-text); }
.nav-item.active { background: var(--color-primary); color: white; }

/* ---------- Cards (Rich Media) ---------- */
.card {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 16px;
  transition: transform 0.15s ease, opacity 0.15s ease;
}
.card:hover { transform: translateY(-2px); opacity: 0.97; cursor: pointer; }
.card-media {
  width: 100%;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  overflow: hidden;
  margin: -16px -16px 12px -16px;
  background: #e2e8f0;
}
.card-media img, .card-media video { width: 100%; display: block; max-height: 180px; object-fit: cover; }
.card h3 { margin: 0 0 6px; font-size: 16px; font-weight: 600; }
.card p { margin: 0; font-size: 14px; color: var(--color-text-muted); line-height: 1.5; }

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 20px;
}

/* ---------- Buttons ---------- */
.btn {
  border: none;
  border-radius: var(--radius-sm);
  padding: 10px 20px;
  font-weight: 600;
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-primary { background: var(--color-primary); color: white; }
.btn-primary:hover { background: var(--color-primary-hover); }
.btn-ghost { background: rgba(99,102,241,0.08); color: var(--color-primary); }
.btn-ghost:hover { background: rgba(99,102,241,0.16); }
.btn-fab {
  position: fixed; bottom: 32px; right: 32px;
  width: 56px; height: 56px; border-radius: 50%;
  background: var(--color-primary); color: white;
  font-size: 24px; box-shadow: 0 4px 14px rgba(55,48,163,0.4);
  display: flex; align-items: center; justify-content: center;
}

/* ---------- Inputs ---------- */
.input, textarea.input {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid rgba(203, 213, 225, 0.8);
  background: rgba(255,255,255,0.7);
  border-radius: var(--radius-sm);
  font-size: 14px;
  font-family: var(--font);
  color: var(--color-text);
}
.input:focus, textarea.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(55, 48, 163, 0.15);
}
label { font-size: 13px; font-weight: 500; color: var(--color-text-muted); display: block; margin-bottom: 6px; }
.field { margin-bottom: 16px; }

/* ---------- Auth pages ---------- */
.auth-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}
.auth-card {
  width: 100%;
  max-width: 420px;
  background: var(--glass-bg-strong);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-modal);
  border: 1px solid var(--color-border);
}
.auth-card h1 { font-size: 24px; margin: 0 0 4px; }
.auth-card .sub { color: var(--color-text-muted); font-size: 14px; margin-bottom: 24px; }

/* ---------- Chips ---------- */
.chip {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.01em;
  padding: 4px 10px; border-radius: var(--radius-full);
  background: rgba(99,102,241,0.12); color: var(--color-secondary);
}
.chip.priority { background: rgba(244,63,94,0.12); color: var(--color-tertiary); }

/* ---------- Toast / errors ---------- */
.alert {
  padding: 12px 16px; border-radius: var(--radius-sm);
  font-size: 14px; margin-bottom: 16px;
}
.alert-error { background: #FFDAD6; color: #93000A; }
.alert-success { background: #DCFCE7; color: #166534; }

/* ---------- Storage bar ---------- */
.storage-bar {
  height: 8px; border-radius: var(--radius-full);
  background: rgba(203,213,225,0.5); overflow: hidden;
}
.storage-bar-fill { height: 100%; background: var(--color-primary); border-radius: var(--radius-full); transition: width 0.3s ease; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 24px; gap: 16px; flex-wrap: wrap;
}
.topbar h1 { font-size: 28px; margin: 0; letter-spacing: -0.01em; }

.empty-state {
  text-align: center; padding: 80px 20px; color: var(--color-text-muted);
}

.hidden { display: none !important; }