:root {
    --bg: #0f1115;
    --panel: #171a21;
    --panel-2: #1e222b;
    --border: #2a2f3a;
    --text: #e8eaf0;
    --text-dim: #9aa2b1;
    --accent: #6c8cff;
    --accent-2: #9b6cff;
    --danger: #ff6c6c;
    --success: #59d19a;
    --radius: 14px;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(160deg, #0f1115 0%, #131722 100%);
    color: var(--text);
    min-height: 100vh;
}

a { color: inherit; text-decoration: none; }

.auth-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
}

.auth-card {
    width: 420px;
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 36px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}

.auth-logo {
    font-size: 26px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 6px;
}

.auth-sub { color: var(--text-dim); margin-bottom: 26px; font-size: 14px; }

.field { margin-bottom: 16px; }
.field label { display: block; font-size: 13px; color: var(--text-dim); margin-bottom: 6px; }
.field input, .field select, .field textarea {
    width: 100%;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 11px 13px;
    color: var(--text);
    font-size: 14px;
    outline: none;
    transition: border-color .15s;
}
.field input:focus, .field select:focus, .field textarea:focus { border-color: var(--accent); }

.row-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    border: none;
    border-radius: 10px;
    padding: 11px 18px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform .1s, opacity .15s;
}
.btn:active { transform: scale(0.97); }
.btn-primary { background: linear-gradient(90deg, var(--accent), var(--accent-2)); color: #fff; width: 100%; }
.btn-primary:hover { opacity: 0.92; }
.btn-ghost { background: var(--panel-2); color: var(--text); border: 1px solid var(--border); }
.btn-danger { background: rgba(255,108,108,0.14); color: var(--danger); }
.btn-sm { padding: 7px 12px; font-size: 13px; }

.advanced-toggle { color: var(--accent); font-size: 13px; cursor: pointer; margin: 8px 0 16px; display: inline-block; }

.error-box {
    background: rgba(255,108,108,0.1);
    border: 1px solid rgba(255,108,108,0.3);
    color: var(--danger);
    padding: 10px 14px;
    border-radius: 10px;
    font-size: 13px;
    margin-bottom: 16px;
}

.app-shell {
    display: grid;
    grid-template-columns: 240px 1fr;
    min-height: 100vh;
}

.sidebar {
    background: var(--panel);
    border-right: 1px solid var(--border);
    padding: 20px 14px;
    display: flex;
    flex-direction: column;
}

.sidebar .brand {
    font-size: 20px;
    font-weight: 700;
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    padding: 0 8px 20px;
}

.compose-btn {
    background: linear-gradient(90deg, var(--accent), var(--accent-2));
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 13px;
    font-weight: 600;
    cursor: pointer;
    margin-bottom: 18px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: 10px;
    color: var(--text-dim);
    font-size: 14px;
    cursor: pointer;
    margin-bottom: 2px;
}
.nav-item:hover { background: var(--panel-2); color: var(--text); }
.nav-item.active { background: var(--panel-2); color: var(--text); }
.nav-item .badge {
    margin-left: auto;
    background: var(--accent);
    color: #fff;
    font-size: 11px;
    padding: 1px 7px;
    border-radius: 20px;
}

.sidebar-footer {
    margin-top: auto;
    border-top: 1px solid var(--border);
    padding-top: 14px;
    font-size: 13px;
    color: var(--text-dim);
}
.sidebar-footer .who { color: var(--text); margin-bottom: 8px; word-break: break-all; }

.main {
    padding: 24px 30px;
    overflow-y: auto;
    max-height: 100vh;
}

.topbar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.topbar h1 { font-size: 22px; margin: 0; }

.search-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 10px 16px;
    width: 340px;
    color: var(--text);
    font-size: 14px;
}

.panel {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    overflow: hidden;
}

.mail-row {
    display: grid;
    grid-template-columns: 24px 220px 1fr 90px;
    gap: 14px;
    align-items: center;
    padding: 14px 18px;
    border-bottom: 1px solid var(--border);
    cursor: pointer;
    font-size: 14px;
}
.mail-row:last-child { border-bottom: none; }
.mail-row:hover { background: var(--panel-2); }
.mail-row.unread { font-weight: 700; }
.mail-row .from { color: var(--text); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mail-row .subject { color: var(--text-dim); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.mail-row.unread .subject { color: var(--text); }
.mail-row .date { color: var(--text-dim); font-size: 12px; text-align: right; }

.star { color: var(--text-dim); }
.star.active { color: #f5c95d; }

.empty-state {
    padding: 60px 20px;
    text-align: center;
    color: var(--text-dim);
}

.pagination { display: flex; justify-content: flex-end; gap: 8px; margin-top: 14px; }

.email-view {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 26px;
}
.email-view .subject { font-size: 20px; font-weight: 700; margin-bottom: 14px; }
.email-view .meta { color: var(--text-dim); font-size: 13px; margin-bottom: 4px; }
.email-view .body { margin-top: 20px; line-height: 1.6; border-top: 1px solid var(--border); padding-top: 20px; }
.email-actions { display: flex; gap: 10px; margin-top: 24px; }

.attachment-chip {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 8px 12px;
    margin: 4px 6px 0 0;
    font-size: 13px;
}

.compose-form .to-fields { display: flex; flex-direction: column; gap: 0; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.compose-form .to-fields input { border: none; border-bottom: 1px solid var(--border); border-radius: 0; background: transparent; padding: 12px 4px; }
.compose-form .to-fields input:last-child { border-bottom: none; }
.compose-form textarea { min-height: 260px; resize: vertical; }

.dropzone {
    border: 2px dashed var(--border);
    border-radius: 12px;
    padding: 22px;
    text-align: center;
    color: var(--text-dim);
    font-size: 13px;
    margin-top: 14px;
    cursor: pointer;
    transition: border-color .15s, background .15s;
}
.dropzone.drag { border-color: var(--accent); background: rgba(108,140,255,0.06); }

.compose-actions { display: flex; justify-content: space-between; align-items: center; margin-top: 18px; }
.compose-actions .left { display: flex; gap: 10px; }

.grid-contacts { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 16px; }
.contact-card {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 18px;
}
.contact-avatar {
    width: 44px; height: 44px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    display: flex; align-items: center; justify-content: center;
    font-weight: 700;
    margin-bottom: 12px;
}
.contact-card .name { font-weight: 600; margin-bottom: 2px; }
.contact-card .email { color: var(--text-dim); font-size: 13px; margin-bottom: 10px; }
.contact-card .actions { display: flex; gap: 8px; }

.modal-overlay {
    position: fixed; inset: 0;
    background: rgba(5,7,12,0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 50;
    backdrop-filter: blur(3px);
}
.modal-overlay.open { display: flex; }
.modal-box {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    width: 480px;
    max-width: 92vw;
    max-height: 86vh;
    overflow-y: auto;
    padding: 26px;
}
.modal-box h2 { margin-top: 0; font-size: 18px; }
.modal-close { float: right; cursor: pointer; color: var(--text-dim); font-size: 20px; }

.breadcrumb { display: flex; gap: 6px; color: var(--text-dim); font-size: 13px; margin-bottom: 16px; }
.breadcrumb .crumb { cursor: pointer; }
.breadcrumb .crumb:hover { color: var(--text); }

.drive-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 14px; }
.drive-item {
    background: var(--panel);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 16px;
    text-align: center;
    cursor: pointer;
    position: relative;
}
.drive-item:hover { border-color: var(--accent); }
.drive-item .icon { font-size: 34px; margin-bottom: 10px; }
.drive-item .name { font-size: 13px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.drive-item .size { font-size: 11px; color: var(--text-dim); margin-top: 4px; }
.drive-item .menu-dots { position: absolute; top: 8px; right: 10px; color: var(--text-dim); cursor: pointer; }

.progress-bar { height: 6px; background: var(--panel-2); border-radius: 4px; overflow: hidden; margin-top: 10px; }
.progress-bar .fill { height: 100%; width: 0%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); transition: width .2s; }

.toast-container { position: fixed; bottom: 24px; right: 24px; z-index: 100; display: flex; flex-direction: column; gap: 10px; }
.toast {
    background: var(--panel-2);
    border: 1px solid var(--border);
    border-left: 4px solid var(--accent);
    padding: 12px 16px;
    border-radius: 10px;
    font-size: 13px;
    min-width: 220px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}
.toast.error { border-left-color: var(--danger); }
.toast.success { border-left-color: var(--success); }

.checkbox-round {
    width: 18px; height: 18px;
    border: 1px solid var(--border);
    border-radius: 50%;
    display: inline-block;
}

.storage-meter { margin-top: 10px; }
.storage-meter .track { height: 6px; background: var(--panel-2); border-radius: 4px; overflow: hidden; }
.storage-meter .fill { height: 100%; background: linear-gradient(90deg, var(--accent), var(--accent-2)); }
.storage-meter .label { font-size: 12px; color: var(--text-dim); margin-top: 6px; }

@media (max-width: 900px) {
    .app-shell { grid-template-columns: 1fr; }
    .sidebar { display: none; }
}