/* ─── Liquid Glass ──────────────────────────────────────────────
   Extends shared.css's dark JUpiterium palette with a translucent,
   light-refracting material for panels/cards/buttons — heavier blur,
   a bright top-left inner rim standing in for a light source, a soft
   outer bloom, and a diagonal specular sheen that sweeps across the
   surface on hover/press. Needs a colorful, moving backdrop behind it
   (see .ambient-blob below) — blurring a flat single-tone background
   reads as plain frosted plastic, not glass. */

:root {
  --glass-fill:      linear-gradient(165deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.02) 40%, rgba(99, 102, 241, 0.06) 100%);
  --glass-fill-hover: linear-gradient(165deg, rgba(255, 255, 255, 0.14), rgba(255, 255, 255, 0.03) 40%, rgba(99, 102, 241, 0.09) 100%);
  --glass-rim-light: rgba(255, 255, 255, 0.55);
  --glass-rim-dark:  rgba(255, 255, 255, 0.06);
  --glass-blur:      28px;
  --glass-radius:    26px;
  --glass-radius-sm: 18px;
}

/* ─── Ambient backdrop ──────────────────────────────────────────
   Fixed, blurred, slowly-drifting color blobs behind the glass UI.
   Pure CSS, no canvas — just enough movement/color variation for the
   glass blur to have something worth refracting. */
.ambient-layer {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  pointer-events: none;
}

.ambient-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  animation: ambientDrift 22s ease-in-out infinite alternate;
}

.ambient-blob.b1 {
  width: 520px; height: 520px;
  top: -120px; left: -80px;
  background: radial-gradient(circle, var(--clr-indigo), transparent 70%);
  animation-duration: 26s;
}
.ambient-blob.b2 {
  width: 460px; height: 460px;
  top: 20%; right: -140px;
  background: radial-gradient(circle, var(--clr-violet), transparent 70%);
  animation-duration: 30s;
  animation-delay: -6s;
}
.ambient-blob.b3 {
  width: 420px; height: 420px;
  bottom: -160px; left: 30%;
  background: radial-gradient(circle, var(--clr-cyan), transparent 70%);
  animation-duration: 24s;
  animation-delay: -12s;
}

@keyframes ambientDrift {
  from { transform: translate(0, 0) scale(1); }
  to   { transform: translate(60px, 40px) scale(1.15); }
}

/* ─── Core glass surface ────────────────────────────────────────
   Applied to any panel/card/button that should read as "liquid
   glass". Layers: blurred+saturated backdrop, a soft gradient fill
   (not flat rgba — gives the fake-refraction depth), a bright inset
   rim top-left fading to a dark rim bottom-right (light source cue),
   and an outer bloom shadow for elevation. */
.glass {
  position: relative;
  background: var(--glass-fill);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border-radius: var(--glass-radius);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    inset 1px 1px 1px var(--glass-rim-light),
    inset -1px -1px 1px var(--glass-rim-dark),
    0 12px 40px rgba(0, 0, 0, 0.45),
    0 2px 8px rgba(0, 0, 0, 0.25);
  overflow: hidden;
  transition: var(--transition);
}

/* Specular sheen — a soft diagonal light streak, swept in from the
   top-left on hover to sell the "light passing over glass" feel. */
.glass::before {
  content: '';
  position: absolute;
  inset: -60% -60% auto auto;
  width: 140%;
  height: 140%;
  background: linear-gradient(115deg, rgba(255, 255, 255, 0.16) 0%, rgba(255, 255, 255, 0) 32%);
  transform: translate(-30%, -30%);
  opacity: 0;
  transition: opacity 0.5s ease, transform 0.9s cubic-bezier(0.16, 1, 0.3, 1);
  pointer-events: none;
}

.glass:hover::before {
  opacity: 1;
  transform: translate(0%, 0%);
}

.glass-interactive {
  cursor: pointer;
}
.glass-interactive:hover {
  background: var(--glass-fill-hover);
  transform: translateY(-2px);
  box-shadow:
    inset 1px 1px 1px var(--glass-rim-light),
    inset -1px -1px 1px var(--glass-rim-dark),
    0 18px 48px rgba(0, 0, 0, 0.5),
    0 0 0 1px rgba(255, 255, 255, 0.1);
}
.glass-interactive:active {
  transform: translateY(0) scale(0.99);
}

.glass-sm {
  border-radius: var(--glass-radius-sm);
}

/* ─── Glass button ──────────────────────────────────────────────
   Same material as .glass but sized/shaped like a pill button. Used
   in place of .btn-ghost where the surface benefits from reading as
   glass rather than a flat outline (toolbar actions, compose FAB). */
.glass-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border-radius: 50px;
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--clr-text);
  background: var(--glass-fill);
  backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(180%);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow:
    inset 1px 1px 1px var(--glass-rim-light),
    inset -1px -1px 1px var(--glass-rim-dark),
    0 6px 20px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}
.glass-btn:hover {
  transform: translateY(-2px);
  background: var(--glass-fill-hover);
  box-shadow:
    inset 1px 1px 1px var(--glass-rim-light),
    inset -1px -1px 1px var(--glass-rim-dark),
    0 10px 28px rgba(0, 0, 0, 0.45);
}
.glass-btn:active { transform: translateY(0) scale(0.98); }

.glass-btn.glass-btn-accent {
  color: #fff;
  background: linear-gradient(165deg, rgba(99, 102, 241, 0.55), rgba(139, 92, 246, 0.35));
  border-color: rgba(139, 92, 246, 0.4);
}
.glass-btn.glass-btn-accent:hover {
  background: linear-gradient(165deg, rgba(99, 102, 241, 0.7), rgba(139, 92, 246, 0.5));
}

/* ─── Mail shell layout ─────────────────────────────────────────*/
.mail-shell {
  display: grid;
  grid-template-columns: 260px 360px 1fr;
  gap: 20px;
  height: calc(100vh - 112px);
  padding: 100px 24px 24px;
  max-width: 1600px;
  margin: 0 auto;
}

@media (max-width: 1100px) {
  .mail-shell { grid-template-columns: 220px 1fr; }
  .mail-reading-pane { display: none; }
}

.mail-sidebar {
  padding: 20px 14px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.mail-compose-btn {
  width: 100%;
  justify-content: center;
  margin-bottom: 18px;
}

.mail-folder {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border-radius: var(--glass-radius-sm);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--clr-muted);
  cursor: pointer;
  transition: var(--transition);
}
.mail-folder i { width: 18px; text-align: center; opacity: 0.8; }
.mail-folder:hover { color: var(--clr-text); background: rgba(255, 255, 255, 0.05); }

.mail-folder.active {
  color: #fff;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.35), rgba(139, 92, 246, 0.2));
  box-shadow: inset 1px 1px 1px rgba(255, 255, 255, 0.25);
}

.mail-folder .count {
  margin-left: auto;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--clr-cyan);
  background: rgba(34, 211, 238, 0.12);
  border-radius: 20px;
  padding: 2px 8px;
}

.mail-list {
  padding: 10px;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mail-item {
  padding: 14px 16px;
  border-radius: var(--glass-radius-sm);
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid transparent;
}
.mail-item:hover { background: rgba(255, 255, 255, 0.05); }

.mail-item.selected {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.22), rgba(139, 92, 246, 0.12));
  border-color: rgba(139, 92, 246, 0.35);
  box-shadow: inset 1px 1px 1px rgba(255, 255, 255, 0.2);
}

.mail-item-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.mail-item-sender {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--clr-text);
}

.mail-item.unread .mail-item-sender::before {
  content: '';
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gradient-btn);
  box-shadow: 0 0 8px rgba(139, 92, 246, 0.8);
}

.mail-item-time {
  font-size: 0.72rem;
  color: var(--clr-muted);
  flex-shrink: 0;
}

.mail-item-subject {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--clr-text);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-item-snippet {
  font-size: 0.8rem;
  color: var(--clr-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mail-reading-pane {
  padding: 32px;
  overflow-y: auto;
}

.mail-reading-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  padding-bottom: 20px;
  margin-bottom: 20px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.mail-reading-subject {
  font-size: 1.35rem;
  font-weight: 800;
  margin-bottom: 10px;
}

.mail-reading-from {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.88rem;
  color: var(--clr-muted);
}

.mail-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient-btn);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  color: #fff;
  flex-shrink: 0;
}

.mail-reading-actions {
  display: flex;
  gap: 8px;
  flex-shrink: 0;
}

.mail-reading-actions .glass-btn {
  padding: 9px 14px;
  font-size: 0.8rem;
}

.mail-reading-body {
  font-size: 0.95rem;
  color: #cbd5e1;
  line-height: 1.75;
}
.mail-reading-body p { margin-bottom: 14px; }

/* ─── Compose overlay ───────────────────────────────────────────*/
.compose-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 2, 12, 0.55);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2000;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}
.compose-overlay.open { opacity: 1; pointer-events: all; }

.compose-card {
  width: 100%;
  max-width: 640px;
  max-height: 85vh;
  display: flex;
  flex-direction: column;
  padding: 28px;
  transform: translateY(20px) scale(0.98);
  transition: transform 0.35s cubic-bezier(0.16, 1, 0.3, 1);
}
.compose-overlay.open .compose-card { transform: translateY(0) scale(1); }

.compose-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 18px;
}

.compose-close {
  background: none;
  border: none;
  color: var(--clr-muted);
  font-size: 1.1rem;
  cursor: pointer;
  padding: 4px;
}
.compose-close:hover { color: var(--clr-text); }

.compose-field {
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  padding: 12px 0;
}
.compose-field input,
.compose-field textarea {
  width: 100%;
  background: transparent;
  border: none;
  outline: none;
  color: var(--clr-text);
  font-family: var(--font);
  font-size: 0.92rem;
}
.compose-field textarea {
  resize: none;
  min-height: 200px;
  line-height: 1.6;
  padding-top: 8px;
}
.compose-field input::placeholder,
.compose-field textarea::placeholder { color: var(--clr-muted); }

.compose-footer {
  display: flex;
  justify-content: flex-end;
  margin-top: 18px;
}