:root {
    --primary-color: #4f46e5;
    --primary-hover: #4338ca;
    --primary-light: #e0e7ff;
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --input-bg: #0f172a;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.3), 0 8px 10px -6px rgba(0, 0, 0, 0.3);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
    padding: 24px 16px;
    min-height: 100vh;
    display: flex;
    justify-content: center;
}

.app-wrapper {
    width: 100%;
    max-width: 900px;
}

/* Header Styling */
.app-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    background: var(--card-bg);
    padding: 20px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow);
    flex-wrap: wrap;
    gap: 16px;
}

.brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary-color), #818cf8);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    color: #fff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
}

.brand h1 {
    font-size: 20px;
    font-weight: 700;
    color: var(--text-main);
}

.subtitle {
    font-size: 13px;
    color: var(--text-muted);
}

.header-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.btn-settings {
    background: #334155;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 8px 14px;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
    transition: background 0.2s, border-color 0.2s;
}

.btn-settings:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: #fff;
}

.smtp-badge {
    display: flex;
    align-items: center;
    gap: 10px;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    padding: 8px 14px;
    border-radius: 30px;
    font-size: 13px;
    font-weight: 500;
}

.status-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    display: inline-block;
}

.status-dot.green { background-color: var(--success-color); box-shadow: 0 0 8px var(--success-color); }
.status-dot.red { background-color: var(--danger-color); box-shadow: 0 0 8px var(--danger-color); }
.status-dot.pulsing-yellow {
    background-color: var(--warning-color);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(1.2); }
    100% { opacity: 1; transform: scale(1); }
}

.btn-refresh-smtp {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    font-size: 13px;
    transition: color 0.2s, transform 0.2s;
}

.btn-refresh-smtp:hover {
    color: var(--text-main);
    transform: rotate(180deg);
}

/* Main Form Card */
.main-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    padding: 32px;
    box-shadow: var(--shadow);
}

.form-section {
    margin-bottom: 28px;
    padding-bottom: 24px;
    border-bottom: 1px solid var(--border-color);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 18px;
}

.section-header i {
    color: var(--primary-color);
    font-size: 18px;
}

.section-header h3 {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-main);
    flex-grow: 1;
}

.grid-2 {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

@media (max-width: 640px) {
    .grid-2 {
        grid-template-columns: 1fr;
    }
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 6px;
}

.checkbox-label {
    display: flex !important;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-weight: 400 !important;
}

.label-with-count {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 6px;
}

.badge-count {
    font-size: 11px;
    background: rgba(79, 70, 229, 0.2);
    color: #818cf8;
    padding: 2px 8px;
    border-radius: 12px;
    font-weight: 600;
}

input[type="text"],
input[type="email"],
input[type="password"],
select,
textarea {
    width: 100%;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 12px 14px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-family: inherit;
    transition: border-color 0.2s, box-shadow 0.2s;
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus,
select:focus,
textarea:focus,
.editor-content:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.25);
}

textarea {
    resize: vertical;
}

.input-hint {
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
    display: block;
}

.subject-input-wrapper {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.quick-tags {
    display: flex;
    gap: 8px;
}

.tag-chip {
    font-size: 11px;
    background: #334155;
    color: #cbd5e1;
    padding: 4px 8px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.2s, color 0.2s;
}

.tag-chip:hover {
    background: var(--primary-color);
    color: #fff;
}

/* Rich Editor Toolbar & Box */
.editor-view-toggle {
    display: flex;
    background: var(--input-bg);
    border: 1px solid var(--border-color);
    padding: 2px;
    border-radius: var(--radius-sm);
}

.btn-toggle {
    background: none;
    border: none;
    color: var(--text-muted);
    padding: 4px 10px;
    font-size: 12px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    cursor: pointer;
}

.btn-toggle.active {
    background: var(--primary-color);
    color: #fff;
}

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 6px;
    background: #111827;
    border: 1px solid var(--border-color);
    border-bottom: none;
    padding: 8px 12px;
    border-top-left-radius: var(--radius-md);
    border-top-right-radius: var(--radius-md);
}

.toolbar-group {
    display: flex;
    align-items: center;
    gap: 4px;
}

.toolbar-group button,
.toolbar-group select {
    background: #1e293b;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    transition: background 0.2s;
}

.toolbar-group button:hover,
.toolbar-group select:hover {
    background: var(--primary-color);
    color: #fff;
}

.toolbar-divider {
    width: 1px;
    height: 20px;
    background: var(--border-color);
    margin: 0 4px;
}

.color-picker-btn {
    position: relative;
    background: #1e293b;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 13px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.color-picker-btn input[type="color"] {
    position: absolute;
    opacity: 0;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    cursor: pointer;
}

.toolbar-file-btn {
    background: #1e293b;
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 6px 10px;
    border-radius: 4px;
    font-size: 12px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

.toolbar-file-btn input[type="file"] {
    display: none;
}

.editor-content {
    background: #ffffff;
    color: #1e293b;
    min-height: 220px;
    max-height: 450px;
    overflow-y: auto;
    padding: 16px;
    border: 1px solid var(--border-color);
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
    font-size: 14px;
    line-height: 1.6;
}

.editor-content[data-placeholder]:empty:before {
    content: attr(data-placeholder);
    color: #94a3b8;
}

.raw-code-content {
    background: #0f172a;
    color: #38bdf8;
    font-family: 'Fira Code', monospace;
    font-size: 13px;
    min-height: 220px;
    border-bottom-left-radius: var(--radius-md);
    border-bottom-right-radius: var(--radius-md);
}

/* File Dropzone */
.file-dropzone {
    border: 2px dashed var(--border-color);
    background: rgba(15, 23, 42, 0.4);
    border-radius: var(--radius-md);
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color 0.2s, background 0.2s;
}

.file-dropzone:hover,
.file-dropzone.dragover {
    border-color: var(--primary-color);
    background: rgba(79, 70, 229, 0.1);
}

.drop-icon {
    font-size: 32px;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.browse-link {
    color: #818cf8;
    font-weight: 600;
    text-decoration: underline;
}

.file-limits {
    display: block;
    font-size: 11px;
    color: var(--text-muted);
    margin-top: 4px;
}

.file-list {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-top: 12px;
}

.file-chip {
    background: #334155;
    color: #f8fafc;
    font-size: 12px;
    padding: 6px 12px;
    border-radius: 20px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
}

.file-chip .remove-file {
    cursor: pointer;
    color: #f87171;
    font-weight: bold;
}

/* Form Actions */
.form-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 16px;
}

.btn-primary, .btn-secondary {
    padding: 12px 24px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: none;
    transition: background 0.2s, transform 0.1s;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #6366f1);
    color: white;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-hover), var(--primary-color));
    transform: translateY(-1px);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-secondary {
    background: #334155;
    color: var(--text-main);
}

.btn-secondary:hover {
    background: #475569;
}

/* Status Banner */
.status-alert {
    margin-top: 20px;
    padding: 14px 18px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 500;
    display: flex;
    align-items: center;
    gap: 10px;
}

.status-alert.success {
    background: rgba(16, 185, 129, 0.15);
    border: 1px solid var(--success-color);
    color: #6ee7b7;
}

.status-alert.error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid var(--danger-color);
    color: #fca5a5;
}

.hidden {
    display: none !important;
}

/* Modal Overlay */
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 20px;
}

.modal-card {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 700px;
    max-height: 85vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow);
}

.modal-header {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-close {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 24px;
    cursor: pointer;
}

.modal-body {
    padding: 20px 24px;
    overflow-y: auto;
}

.modal-desc {
    font-size: 13px;
    color: var(--text-muted);
    margin-bottom: 18px;
}

.preview-meta {
    background: #0f172a;
    padding: 12px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    margin-bottom: 16px;
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.preview-html-box {
    background: #ffffff;
    color: #000000;
    padding: 20px;
    border-radius: var(--radius-sm);
    min-height: 200px;
}

.modal-footer {
    padding: 16px 24px;
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: flex-end;
    gap: 12px;
}