:root {
    --bg-color: #f5f7fa;
    --sidebar-bg: #ffffff;
    --primary-color: #4a6cf7;
    --primary-hover: #3a5ce5;
    --text-main: #333333;
    --text-muted: #6b7280;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --radius-md: 8px;
    --radius-lg: 12px;
}

* {
    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;
    height: 100vh;
    overflow: hidden;
}

.app-container {
    display: flex;
    height: 100vh;
}

/* Sidebar Styling */
.sidebar {
    width: 400px;
    min-width: 400px;
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.sidebar-header {
    padding: 24px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-header h2 {
    font-family: 'Outfit', sans-serif;
    font-size: 20px;
    font-weight: 600;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
}

.sidebar-header p {
    font-size: 13px;
    color: var(--text-muted);
    margin-top: 4px;
}

.form-container {
    padding: 24px;
    overflow-y: auto;
    flex-grow: 1;
}

.form-container::-webkit-scrollbar {
    width: 6px;
}
.form-container::-webkit-scrollbar-thumb {
    background-color: #cbd5e1;
    border-radius: 10px;
}

.form-section {
    margin-bottom: 30px;
}

.form-section h3 {
    font-size: 14px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    margin-bottom: 16px;
    display: flex;
    align-items: center;
    gap: 8px;
}

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

.form-group label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-main);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group textarea {
    width: 100%;
    padding: 10px 12px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: 'Inter', sans-serif;
    font-size: 14px;
    transition: all 0.2s ease;
    background-color: #f9fafb;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(74, 108, 247, 0.1);
    background-color: #fff;
}

.form-group textarea {
    resize: vertical;
    min-height: 80px;
}

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

.color-pickers {
    display: flex;
    gap: 16px;
}

.color-picker {
    flex: 1;
}

.color-picker input[type="color"] {
    width: 100%;
    height: 40px;
    padding: 2px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    cursor: pointer;
}

/* Main Preview Area */
.preview-area {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    background-image: radial-gradient(#e5e7eb 1px, transparent 1px);
    background-size: 20px 20px;
}

.preview-header {
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(8px);
    padding: 16px 32px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    border-bottom: 1px solid var(--border-color);
    z-index: 5;
}

.template-selector {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.tpl-btn {
    padding: 8px 16px;
    border: 1px solid var(--border-color);
    background: #fff;
    border-radius: 20px;
    font-size: 13px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    white-space: nowrap;
}

.tpl-btn:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.tpl-btn.active {
    background: var(--primary-color);
    color: #fff;
    border-color: var(--primary-color);
    box-shadow: 0 4px 6px rgba(74, 108, 247, 0.2);
}

.action-buttons {
    display: flex;
    gap: 12px;
}

.btn {
    padding: 10px 20px;
    border-radius: var(--radius-md);
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.2s;
    border: none;
}

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
    box-shadow: 0 4px 6px rgba(74, 108, 247, 0.2);
}

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 8px rgba(74, 108, 247, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-secondary {
    background-color: #fff;
    color: var(--text-main);
    border: 1px solid var(--border-color);
}

.btn-secondary:hover {
    background-color: #f9fafb;
    border-color: #d1d5db;
}

.preview-canvas {
    flex-grow: 1;
    padding: 40px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    overflow-y: auto;
}

.browser-mockup {
    background: #fff;
    width: 100%;
    max-width: 800px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.browser-header {
    background: #f1f5f9;
    padding: 12px 16px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
}

.dot.red { background: #ff5f56; }
.dot.yellow { background: #ffbd2e; }
.dot.green { background: #27c93f; }

.browser-title {
    margin-left: 16px;
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

.browser-body {
    padding: 0;
}

.email-metadata {
    padding: 16px 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 14px;
}

.email-metadata div {
    margin-bottom: 8px;
}

.email-metadata div:last-child {
    margin-bottom: 0;
}

.email-metadata strong {
    color: var(--text-muted);
    display: inline-block;
    width: 60px;
}

.email-content {
    padding: 32px 24px;
    font-size: 15px;
    color: #1f2937;
}

.email-content p {
    margin-bottom: 16px;
}

#signature-container {
    margin-top: 32px;
    /* Important for email signatures: no specific isolation that breaks copy/paste */
}

/* Toast */
.toast {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background: #10b981;
    color: #fff;
    padding: 12px 24px;
    border-radius: 30px;
    font-weight: 500;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
    transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    z-index: 1000;
    pointer-events: none;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
}