:root {
  --bg: #f4f4f8; --bg-card: #ffffff; --bg-hover: #e8e8f0;
  --border: #d8d8e0; --text: #1a1a2e; --text-dim: #6b6b80;
  --accent: #6366f1; --accent-hover: #818cf8;
  --red: #dc2626;
  --radius: 12px;
  --card-shadow: 0 4px 24px rgba(0,0,0,0.06);
  --card-hover-shadow: 0 8px 32px rgba(99,102,241,0.12);
  --index-gradient1: rgba(99,102,241,0.06);
  --index-gradient2: rgba(34,197,94,0.04);
}
[data-theme="dark"] {
  --bg: #0f0f14; --bg-card: #1a1a24; --bg-hover: #22222e;
  --border: #2a2a3a; --text: #e4e4ef; --text-dim: #8888a0;
  --accent: #6366f1; --accent-hover: #818cf8;
  --red: #ef4444;
  --card-shadow: 0 4px 24px rgba(0,0,0,0.2);
  --card-hover-shadow: 0 8px 32px rgba(99,102,241,0.15);
  --index-gradient1: rgba(99,102,241,0.08);
  --index-gradient2: rgba(34,197,94,0.05);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font-family: 'Inter', system-ui, sans-serif; background: var(--bg); color: var(--text);
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  background-image:
    radial-gradient(ellipse at 20% 50%, var(--index-gradient1) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 50%, var(--index-gradient2) 0%, transparent 50%);
}

.selector-container { width: 100%; max-width: 900px; padding: 20px; }

.selector-header {
  text-align: center; margin-bottom: 40px;
}
.selector-header .icon {
  width: 48px; height: 48px; background: var(--accent); border-radius: 12px;
  display: inline-flex; align-items: center; justify-content: center; margin-bottom: 14px;
}
.selector-header .icon img { width: 40px; height: 40px; border-radius: 8px; }
.selector-header h1 { font-size: 22px; font-weight: 700; letter-spacing: -0.5px; }
.selector-header p { font-size: 13px; color: var(--text-dim); margin-top: 6px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }

.card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; text-decoration: none; color: var(--text);
  transition: all 0.2s; cursor: pointer; display: flex; flex-direction: column; align-items: center;
  text-align: center; box-shadow: var(--card-shadow);
}
.card:hover { border-color: var(--accent); transform: translateY(-3px); box-shadow: var(--card-hover-shadow); }

.card-icon {
  width: 64px; height: 64px; border-radius: 12px; object-fit: contain;
  margin-bottom: 16px; background: #fff; padding: 4px;
}

.card h2 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.card p { font-size: 12px; color: var(--text-dim); line-height: 1.5; }

.card-badge {
  margin-top: 14px; font-size: 10px; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; color: var(--accent); background: rgba(99,102,241,0.1);
  padding: 4px 12px; border-radius: 20px;
}

.selector-footer {
  text-align: center; margin-top: 30px; display: flex; align-items: center; justify-content: center; gap: 16px;
}
.selector-footer .user { font-size: 11px; color: var(--text-dim); }
.selector-footer .logout-btn {
  background: none; border: 1px solid var(--border); border-radius: 6px;
  color: var(--red); font-size: 11px; font-weight: 500; padding: 5px 14px;
  cursor: pointer; font-family: inherit; transition: all 0.15s;
}
.selector-footer .logout-btn:hover { background: var(--red); color: #fff; border-color: var(--red); }

/* SMTP button */
.smtp-btn {
  background: none; border: 1px solid var(--border); border-radius: 6px;
  color: var(--text-dim); font-size: 11px; font-weight: 500; padding: 5px 14px;
  cursor: pointer; font-family: inherit; transition: all 0.15s;
}
.smtp-btn:hover { border-color: var(--accent); color: var(--accent); }

/* SMTP modal */
.smtp-modal-bg {
  position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 100;
  display: flex; align-items: center; justify-content: center;
}
.smtp-modal-box {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius);
  width: 440px; max-width: 95vw; box-shadow: 0 16px 48px rgba(0,0,0,0.15);
}
.smtp-modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.smtp-modal-head h3 { font-size: 15px; font-weight: 600; }
.smtp-modal-head button {
  background: none; border: none; font-size: 20px; cursor: pointer;
  color: var(--text-dim); line-height: 1;
}
.smtp-modal-body { padding: 20px; }
.smtp-field { margin-bottom: 14px; }
.smtp-field label { display: block; font-size: 11px; font-weight: 600; color: var(--text-dim); margin-bottom: 4px; text-transform: uppercase; letter-spacing: 0.5px; }
.smtp-field input, .smtp-field select {
  width: 100%; padding: 8px 10px; background: var(--bg); border: 1px solid var(--border);
  border-radius: 6px; font-size: 13px; color: var(--text); font-family: inherit;
  transition: border-color 0.15s;
}
.smtp-field input:focus, .smtp-field select:focus { outline: none; border-color: var(--accent); }
.smtp-field-row { display: flex; gap: 12px; }
.smtp-modal-foot {
  display: flex; align-items: center; padding: 14px 20px; border-top: 1px solid var(--border);
}
.smtp-btn-action {
  border: none; border-radius: 6px; font-size: 12px; font-weight: 500;
  padding: 7px 16px; cursor: pointer; font-family: inherit; transition: all 0.15s;
}
.smtp-btn-action.test { background: none; border: 1px solid var(--border); color: var(--text-dim); }
.smtp-btn-action.test:hover { border-color: var(--accent); color: var(--accent); }
.smtp-btn-action.cancel { background: none; color: var(--text-dim); margin-right: 8px; }
.smtp-btn-action.save { background: var(--accent); color: #fff; }
.smtp-btn-action.save:hover { background: var(--accent-hover); }

@media (max-width: 800px) {
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 500px) {
  .cards { grid-template-columns: 1fr; }
}