/* ---------------------------------- reset ---------------------------------- */
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body {
  height: 100%;
  font-family: 'Plus Jakarta Sans', system-ui, -apple-system, sans-serif;
  background: #f4f5fb;
  color: #16162a;
  -webkit-tap-highlight-color: transparent;
}
button { font-family: inherit; }
.hidden { display: none !important; }

:root {
  --accent-1: #6366f1;
  --accent-2: #8b5cf6;
  --accent-grad: linear-gradient(135deg, var(--accent-1), var(--accent-2));
  --danger: #ef4444;
  --success: #10b981;
  --surface: #ffffff;
  --border: #e6e7f2;
  --text-dim: #6b7280;
  --radius: 16px;
  --shadow-sm: 0 2px 8px rgba(30, 20, 90, 0.06);
  --shadow-md: 0 8px 28px rgba(30, 20, 90, 0.12);
}

/* ---------------------------------- screens --------------------------------- */
.screen { min-height: 100vh; }

/* ------------------------------- auth screens -------------------------------- */
#login-screen, #username-screen {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: radial-gradient(circle at 20% 0%, #eef0ff 0%, #f4f5fb 55%);
}
.auth-card {
  width: 100%;
  max-width: 380px;
  background: var(--surface);
  border-radius: 24px;
  padding: 36px 28px;
  box-shadow: var(--shadow-md);
  text-align: center;
  animation: rise 0.5s cubic-bezier(.2,.8,.2,1);
}
@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
  to { opacity: 1; transform: translateY(0); }
}
.brand-mark {
  width: 56px; height: 56px;
  border-radius: 16px;
  background: var(--accent-grad);
  color: #fff;
  font-weight: 800;
  font-size: 26px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 18px;
  box-shadow: 0 10px 24px rgba(99,102,241,0.35);
}
.auth-card h1 { font-size: 26px; font-weight: 800; margin-bottom: 6px; text-align: left; }
.accent { background: var(--accent-grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.auth-card > h1, .auth-card > p { text-align: center; }
.auth-card p { color: var(--text-dim); font-size: 14px; margin-bottom: 22px; }

/* ---------------------------------- buttons ---------------------------------- */
.btn {
  border: none;
  border-radius: 12px;
  padding: 14px 20px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, opacity 0.15s ease;
}
.btn:active { transform: scale(0.97); }
.btn-block { width: 100%; }
.btn-primary {
  background: var(--accent-grad);
  color: #fff;
  box-shadow: 0 8px 20px rgba(99,102,241,0.3);
  display: flex; align-items: center; justify-content: center; gap: 10px;
}
.btn-primary:disabled { opacity: 0.45; cursor: not-allowed; box-shadow: none; }
.g-icon {
  width: 22px; height: 22px; border-radius: 50%; background: #fff; color: var(--accent-1);
  display: inline-flex; align-items: center; justify-content: center; font-weight: 800; font-size: 13px;
}

/* --------------------------------- form fields -------------------------------- */
.field-group { position: relative; margin-bottom: 14px; text-align: left; }
.field-input {
  width: 100%;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  padding: 18px 14px 8px;
  font-size: 15px;
  background: #fafafe;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  font-family: inherit;
}
.field-input:focus {
  outline: none;
  border-color: var(--accent-1);
  box-shadow: 0 0 0 4px rgba(99,102,241,0.12);
}
.field-label {
  position: absolute;
  left: 14px; top: 13px;
  font-size: 15px;
  color: var(--text-dim);
  pointer-events: none;
  transition: all 0.15s ease;
}
.field-input:focus + .field-label,
.field-input:not(:placeholder-shown) + .field-label {
  top: 5px; font-size: 11px; color: var(--accent-1); font-weight: 600;
}
.username-field { display: flex; align-items: center; }
.username-field .field-input { flex: 1; }
.domain-suffix { position: absolute; right: 14px; top: 16px; font-size: 13px; color: var(--text-dim); }
.status-text { font-size: 13px; min-height: 20px; margin: 10px 0 4px; color: var(--text-dim); text-align: left; }
.status-text.success { color: var(--success); font-weight: 600; }
.status-text.error { color: var(--danger); font-weight: 600; }
.hint { font-size: 13px; color: var(--text-dim); margin-bottom: 16px; }

/* ----------------------------------- topbar ----------------------------------- */
.topbar {
  position: sticky; top: 0; z-index: 30;
  display: flex; align-items: center; gap: 10px;
  padding: 14px 16px;
  background: rgba(244,245,251,0.85);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.icon-btn {
  width: 40px; height: 40px; border: none; background: var(--surface);
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  color: #33334a; cursor: pointer; box-shadow: var(--shadow-sm); flex-shrink: 0;
}
.icon-btn svg { width: 20px; height: 20px; }
.search-wrap {
  flex: 1; position: relative; display: flex; align-items: center;
  background: var(--surface); border-radius: 12px; box-shadow: var(--shadow-sm);
}
.search-icon { width: 18px; height: 18px; position: absolute; left: 12px; color: var(--text-dim); }
#search-input {
  width: 100%; border: none; background: transparent; padding: 11px 12px 11px 38px;
  font-size: 14px; border-radius: 12px; font-family: inherit;
}
#search-input:focus { outline: none; }
.avatar-btn, .avatar-lg {
  border-radius: 50%; background: var(--accent-grad); color: #fff; font-weight: 800;
  display: flex; align-items: center; justify-content: center; border: none; cursor: pointer;
  flex-shrink: 0;
}
.avatar-btn { width: 40px; height: 40px; font-size: 15px; }
.avatar-lg { width: 48px; height: 48px; font-size: 18px; }

/* ----------------------------------- drawer ----------------------------------- */
.drawer-overlay {
  position: fixed; inset: 0; background: rgba(15,15,35,0.35); z-index: 40;
  animation: fadeIn 0.2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.drawer {
  position: fixed; top: 0; bottom: 0; left: 0; width: min(300px, 82vw);
  background: var(--surface); z-index: 50; padding: 22px 14px;
  transform: translateX(-100%); transition: transform 0.25s cubic-bezier(.2,.8,.2,1);
  box-shadow: var(--shadow-md); display: flex; flex-direction: column; gap: 4px;
}
.drawer.open { transform: translateX(0); }
.drawer-profile { display: flex; align-items: center; gap: 12px; padding: 8px 10px 20px; }
.drawer-name { font-weight: 700; font-size: 14px; }
.drawer-alias { font-size: 12px; color: var(--accent-1); word-break: break-all; }
.drawer-item {
  display: flex; align-items: center; gap: 14px; border: none; background: transparent;
  padding: 13px 12px; border-radius: 12px; font-size: 14px; font-weight: 600; color: #33334a;
  cursor: pointer; text-align: left; width: 100%; transition: background 0.15s ease;
}
.drawer-item svg { width: 20px; height: 20px; flex-shrink: 0; color: var(--text-dim); }
.drawer-item:hover, .drawer-item.active { background: #f0f0ff; color: var(--accent-1); }
.drawer-item.active svg { color: var(--accent-1); }
.drawer-count {
  margin-left: auto; background: var(--accent-grad); color: #fff; font-size: 11px;
  padding: 2px 8px; border-radius: 999px; font-weight: 700;
}
.drawer-divider { height: 1px; background: var(--border); margin: 10px 4px; }
.drawer-signout { color: var(--danger); }
.drawer-signout svg { color: var(--danger); }

/* ----------------------------------- content ----------------------------------- */
.content { padding: 14px 14px 100px; max-width: 720px; margin: 0 auto; animation: fadeIn 0.2s ease; }
.folder-title { font-size: 22px; font-weight: 800; margin: 6px 4px 16px; }

/* -------------------------------- message list -------------------------------- */
.message-card {
  display: flex; gap: 12px; align-items: flex-start;
  background: var(--surface); border-radius: var(--radius); padding: 14px;
  margin-bottom: 10px; box-shadow: var(--shadow-sm); cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  position: relative; overflow: hidden;
}
.message-card:active { transform: scale(0.985); }
.message-card.unread { box-shadow: 0 2px 10px rgba(99,102,241,0.18); }
.message-card.unread::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 4px; background: var(--accent-grad);
}
.msg-avatar {
  width: 42px; height: 42px; border-radius: 50%; flex-shrink: 0;
  background: var(--accent-grad); color: #fff; font-weight: 700; font-size: 16px;
  display: flex; align-items: center; justify-content: center;
}
.msg-body { flex: 1; min-width: 0; }
.msg-top-row { display: flex; justify-content: space-between; gap: 8px; align-items: baseline; }
.msg-from { font-size: 14px; font-weight: 700; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.message-card.unread .msg-from { color: #0f0f28; }
.msg-time { font-size: 11px; color: var(--text-dim); flex-shrink: 0; }
.msg-subject { font-size: 13.5px; font-weight: 600; color: #33334a; margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-snippet { font-size: 12.5px; color: var(--text-dim); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.msg-actions { display: flex; gap: 6px; margin-top: 8px; }
.chip-btn {
  border: none; background: #f0f0f7; color: #4b4b63; font-size: 11.5px; font-weight: 700;
  padding: 6px 10px; border-radius: 8px; cursor: pointer; display: flex; align-items: center; gap: 4px;
}
.chip-btn.danger { background: #fee2e2; color: var(--danger); }
.chip-btn.success { background: #d1fae5; color: #047857; }
.empty-state { text-align: center; padding: 60px 20px; color: var(--text-dim); }
.empty-state .emoji { font-size: 40px; margin-bottom: 10px; }

/* skeleton loading */
.skeleton { background: var(--surface); border-radius: var(--radius); padding: 14px; margin-bottom: 10px; display: flex; gap: 12px; }
.skel-block { border-radius: 8px; background: linear-gradient(90deg, #eceefb 25%, #f6f7fd 37%, #eceefb 63%); background-size: 400% 100%; animation: shimmer 1.4s ease infinite; }
@keyframes shimmer { 0% { background-position: 100% 50%; } 100% { background-position: 0 50%; } }
.skel-avatar { width: 42px; height: 42px; border-radius: 50%; }
.skel-lines { flex: 1; display: flex; flex-direction: column; gap: 8px; }
.skel-lines div { height: 10px; }

/* ---------------------------------- detail page -------------------------------- */
.detail-header { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; }
.detail-header h2 { font-size: 12px; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); font-weight: 700; }
.detail-card { background: var(--surface); border-radius: var(--radius); padding: 20px; box-shadow: var(--shadow-sm); }
.detail-subject { font-size: 19px; font-weight: 800; margin-bottom: 14px; line-height: 1.3; }
.detail-meta-row { display: flex; align-items: center; gap: 12px; padding: 10px 0; border-top: 1px solid var(--border); }
.detail-meta-row:first-of-type { border-top: none; }
.detail-meta-text { font-size: 13px; }
.detail-meta-text .label { color: var(--text-dim); margin-right: 4px; }
.detail-toolbar { display: flex; gap: 8px; margin: 16px 0; flex-wrap: wrap; }
.detail-body-frame { width: 100%; min-height: 240px; border: 1px solid var(--border); border-radius: 12px; margin-top: 10px; }

/* ---------------------------------- compose page -------------------------------- */
.compose-card { background: var(--surface); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow-sm); }
.compose-card .field-input { margin-bottom: 12px; }
.editor-toolbar { display: flex; flex-wrap: wrap; gap: 6px; padding: 8px; background: #f7f7fc; border-radius: 12px; margin-bottom: 10px; }
.editor-toolbar button {
  background: var(--surface); color: #33334a; border: 1px solid var(--border); border-radius: 8px;
  padding: 7px 11px; font-size: 13px; cursor: pointer;
}
.editor-toolbar button:hover { background: #eef0ff; border-color: var(--accent-1); color: var(--accent-1); }
.editor-body {
  min-height: 200px; border: 1.5px solid var(--border); border-radius: 12px; padding: 14px;
  font-size: 14.5px; line-height: 1.6; margin-bottom: 14px; overflow-y: auto;
}
.editor-body:focus { outline: none; border-color: var(--accent-1); box-shadow: 0 0 0 4px rgba(99,102,241,0.12); }
.editor-body:empty:before { content: attr(data-placeholder); color: #a3a3b8; }

/* ---------------------------------- fab ---------------------------------------- */
.fab {
  position: fixed; right: 20px; bottom: 26px; z-index: 25;
  background: var(--accent-grad); color: #fff; border: none; border-radius: 999px;
  padding: 15px 22px; font-weight: 700; font-size: 14px; display: flex; align-items: center; gap: 8px;
  box-shadow: 0 14px 28px rgba(99,102,241,0.4); cursor: pointer; transition: transform 0.15s ease;
}
.fab:active { transform: scale(0.95); }
.fab svg { width: 18px; height: 18px; }

/* ------------------------------------ modal ------------------------------------- */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(15,15,35,0.45); display: flex;
  align-items: center; justify-content: center; z-index: 60; padding: 20px;
}
.modal {
  background: var(--surface); border-radius: 20px; padding: 26px; width: min(400px, 100%);
  position: relative; box-shadow: var(--shadow-md); animation: rise 0.25s ease;
}
.modal h2 { font-size: 19px; font-weight: 800; margin-bottom: 6px; }
.modal-close { position: absolute; top: 14px; right: 14px; border: none; background: transparent; font-size: 22px; color: var(--text-dim); cursor: pointer; }

/* ---------------------------- global premium spinner ---------------------------- */
.spinner-overlay {
  position: fixed; inset: 0; background: rgba(244,245,251,0.75); backdrop-filter: blur(3px);
  display: flex; align-items: center; justify-content: center; z-index: 100;
}
.spinner-ring {
  width: 54px; height: 54px; border-radius: 50%;
  border: 4px solid #e6e7f2; border-top-color: var(--accent-1); border-right-color: var(--accent-2);
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* -------------------------------------- misc ------------------------------------- */
@media (min-width: 720px) {
  .drawer { position: sticky; transform: none; box-shadow: none; border-right: 1px solid var(--border); }
  .drawer-overlay { display: none !important; }
}