:root {
    --bg-main: #0d0d0d;
    --bg-panel: #1a1a1a;
    --bg-hover: #262626;
    --primary-red: #e50914; /* Tông đỏ đặc trưng */
    --primary-red-hover: #b20710;
    --text-main: #f5f5f5;
    --text-muted: #a3a3a3;
    --border-color: #333;
    --transition-speed: 0.2s;
}

body {
    margin: 0;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

/* Custom Scrollbar */
::-webkit-scrollbar { width: 8px; }
::-webkit-scrollbar-track { background: var(--bg-main); }
::-webkit-scrollbar-thumb { background: var(--border-color); border-radius: 4px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

/* Sidebar */
.sidebar {
    width: 320px;
    background-color: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
}

.sidebar-header {
    padding: 20px;
    background-color: #000;
    color: var(--primary-red);
    font-weight: 800;
    font-size: 1.3rem;
    border-bottom: 2px solid var(--primary-red);
    display: flex;
    align-items: center;
    gap: 10px;
}

.search-box {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    position: relative;
}

.search-box input {
    width: 100%;
    background-color: #000;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 10px 10px 10px 35px;
    border-radius: 6px;
    box-sizing: border-box;
}

.search-box input:focus {
    outline: none;
    border-color: var(--primary-red);
}

.search-box i {
    position: absolute;
    left: 25px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.mail-sections {
    flex-grow: 1;
    overflow-y: auto;
}

.category-title {
    padding: 12px 20px;
    background-color: #0a0a0a;
    color: var(--text-muted);
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: space-between; /* Đẩy nội dung ra 2 bên */
}

.category-title .title-left {
    display: flex;
    align-items: center;
    gap: 8px;
}

/* Kiểu dáng cho thẻ đếm số lượng */
.mail-count {
    background-color: var(--primary-red);
    color: #fff;
    padding: 2px 8px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: bold;
    text-shadow: none;
}

.mail-list { list-style: none; padding: 0; margin: 0; }

.mail-item {
    padding: 12px 20px;
    border-bottom: 1px solid var(--border-color);
    cursor: pointer;
    transition: all var(--transition-speed);
    font-size: 0.95rem;
    border-left: 4px solid transparent;
    display: flex;
    align-items: center;
    color: #fff;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.8);
}

.mail-item:hover { background-color: var(--bg-hover); filter: brightness(1.2); }
.mail-item.active {
    border-left: 4px solid var(--primary-red);
    background-color: var(--bg-hover);
    font-weight: bold;
}

.add-mail-sidebar-btn {
    background-color: #000;
    color: var(--text-main);
    border: none;
    border-top: 1px solid var(--border-color);
    padding: 18px;
    cursor: pointer;
    font-weight: bold;
    transition: background var(--transition-speed);
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 8px;
}

.add-mail-sidebar-btn:hover {
    background-color: var(--primary-red);
    color: #fff;
}

/* Main Content */
.main-content {
    flex-grow: 1;
    padding: 30px 40px;
    overflow-y: auto;
    display: none;
    background: radial-gradient(circle at top left, #1a1a1a, var(--bg-main));
}

.main-content.active { display: block; }

.main-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 25px;
}

h2.mail-title { color: var(--text-main); margin: 0; font-size: 1.8rem; }

.action-buttons { display: flex; gap: 10px; }

.save-btn, .btn-delete {
    padding: 10px 20px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-speed);
}

.save-btn { background-color: var(--primary-red); color: white; }
.save-btn:hover { background-color: var(--primary-red-hover); box-shadow: 0 4px 12px rgba(229, 9, 20, 0.4); }

.btn-delete { background-color: transparent; color: var(--text-muted); border: 1px solid var(--border-color); }
.btn-delete:hover { background-color: rgba(255,0,0,0.1); color: var(--primary-red); border-color: var(--primary-red); }

/* Form Grid */
.info-grid {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 20px;
    align-items: center;
}

.info-label { font-weight: 600; color: var(--text-muted); text-align: right;}

.info-value { position: relative; }

.input-icon {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: #666;
}

.info-value input[type="text"], 
.info-value textarea, 
.info-value select {
    width: 100%;
    background-color: rgba(0,0,0,0.5);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 12px 12px 12px 35px; /* Padding for icon */
    border-radius: 6px;
    font-family: inherit;
    box-sizing: border-box;
    transition: all var(--transition-speed);
}

.info-value select { padding-left: 12px; }
.info-value textarea { padding-left: 12px; resize: vertical; }

.info-value input[type="color"] {
    width: 100%; height: 44px;
    background-color: rgba(0,0,0,0.5);
    border: 1px solid var(--border-color);
    border-radius: 6px; cursor: pointer; padding: 2px;
}

.info-value input:focus, .info-value textarea:focus, .info-value select:focus {
    outline: none;
    border-color: var(--primary-red);
    background-color: #000;
}

/* Custom Fields */
.add-field-btn {
    background-color: transparent;
    color: var(--text-muted);
    border: 1px dashed var(--border-color);
    padding: 12px 20px;
    cursor: pointer;
    border-radius: 6px;
    margin-top: 25px;
    font-weight: bold;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all var(--transition-speed);
    width: 100%;
    justify-content: center;
}

.add-field-btn:hover {
    border-color: var(--primary-red);
    color: var(--primary-red);
    background-color: rgba(229, 9, 20, 0.05);
}

.custom-field-row {
    display: flex;
    gap: 15px;
    margin-bottom: 15px;
    animation: fadeIn 0.3s ease-in-out;
}

.custom-field-row input[type="text"] {
    background-color: rgba(0,0,0,0.5);
    color: var(--text-main);
    border: 1px solid var(--border-color);
    padding: 12px;
    border-radius: 6px;
    transition: border-color var(--transition-speed);
}

.custom-field-row input[type="text"]:focus { border-color: var(--primary-red); outline: none; }
.custom-field-row .key-input { width: 150px; font-weight: bold;}
.custom-field-row .value-input { flex-grow: 1; }
.btn-remove-field { background: transparent; border: none; color: var(--text-muted); cursor: pointer; }
.btn-remove-field:hover { color: var(--primary-red); }

/* Modal */
.modal {
    display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.85); backdrop-filter: blur(4px);
    justify-content: center; align-items: center; z-index: 1000;
}

.modal.active { display: flex; animation: fadeIn 0.2s ease-out; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

.modal-content {
    background: var(--bg-panel);
    padding: 35px;
    border-radius: 12px;
    width: 400px;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}

.modal-title { margin-top: 0; color: var(--text-main); border-bottom: 2px solid var(--primary-red); padding-bottom: 10px; margin-bottom: 20px;}
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; color: var(--text-muted); font-size: 0.9rem;}
.form-group input, .form-group select { width: 100%; padding: 12px; background: rgba(0,0,0,0.5); color: #fff; border: 1px solid var(--border-color); border-radius: 6px; box-sizing: border-box;}
.form-group input:focus, .form-group select:focus { border-color: var(--primary-red); outline: none; }

.modal-actions { display: flex; justify-content: flex-end; gap: 12px; margin-top: 25px; }
.modal-actions button { padding: 10px 20px; border: none; border-radius: 6px; cursor: pointer; font-weight: bold; transition: all 0.2s; }
.btn-cancel { background: transparent; color: var(--text-muted); border: 1px solid var(--border-color); }
.btn-cancel:hover { background: #333; color: #fff; }
.btn-add { background: var(--primary-red); color: #fff; }
.btn-add:hover { background: var(--primary-red-hover); }

/* Toast Notification */
#toastContainer {
    position: fixed;
    bottom: 30px;
    right: 30px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 9999;
}

.toast {
    background-color: var(--bg-panel);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-red);
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    display: flex;
    align-items: center;
    gap: 10px;
    animation: slideInRight 0.3s ease forwards;
}

.toast.success { border-left-color: #10b981; }
.toast.error { border-left-color: var(--primary-red); }

@keyframes slideInRight {
    from { transform: translateX(100%); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}
@keyframes fadeOut {
    from { opacity: 1; }
    to { opacity: 0; transform: translateY(-10px); }
}

/* --- GIAO DIỆN ĐĂNG NHẬP --- */
.login-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background-color: var(--bg-main);
    z-index: 99999; /* Đảm bảo đè lên mọi thứ khác */
    display: flex;
    justify-content: center;
    align-items: center;
    background-image: radial-gradient(circle at center, #1a1a1a, var(--bg-main));
}

.login-box {
    background: var(--bg-panel);
    padding: 40px;
    border-radius: 12px;
    width: 350px;
    border: 1px solid var(--border-color);
    box-shadow: 0 15px 50px rgba(0,0,0,0.8);
    animation: dropIn 0.4s ease-out;
}

@keyframes dropIn {
    from { transform: translateY(-30px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.login-title {
    color: var(--primary-red);
    text-align: center;
    margin-top: 0;
    margin-bottom: 10px;
    font-size: 1.5rem;
    letter-spacing: 2px;
}

.relative-icon { position: relative; margin-bottom: 15px; }
.relative-icon .input-icon { color: var(--text-muted); }
.relative-icon input { padding-left: 40px !important; }

.login-btn { width: 100%; margin-top: 10px; font-size: 1rem; padding: 12px; justify-content: center;}
.login-error { color: var(--primary-red); font-size: 0.85rem; text-align: center; height: 15px; margin: 0 0 15px 0;}