:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg-dark: #0f172a;
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --radius: 16px;
    --transition: 0.3s ease;
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    overflow-x: hidden;
}

/* Dynamic Background */
.background-globes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

.globe {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}

.globe-1 {
    width: 500px;
    height: 500px;
    background: #4f46e5;
    top: -100px;
    left: -100px;
}

.globe-2 {
    width: 400px;
    height: 400px;
    background: #ec4899;
    bottom: -50px;
    right: -50px;
}

.container {
    width: 100%;
    max-width: 1200px;
    padding: 2rem;
}

.header {
    text-align: center;
    margin-bottom: 2rem;
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(to right, #60a5fa, #c084fc);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
}

.header p {
    color: var(--text-muted);
}

/* Glass Panel */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

.split-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

@media (max-width: 768px) {
    .split-layout {
        grid-template-columns: 1fr;
    }

    .header h1 {
        font-size: 2rem;
    }
}

/* Form Styles */
h2 {
    font-size: 1.25rem;
    margin-bottom: 1.5rem;
    color: var(--text-main);
}

.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

input[type="text"] {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    color: white;
    font-family: inherit;
    transition: var(--transition);
}

input[type="text"]:focus {
    outline: none;
    border-color: var(--primary);
    background: rgba(0, 0, 0, 0.4);
}

/* Upload Area */
.upload-area {
    border: 2px dashed var(--glass-border);
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.1);
}

.upload-area:hover,
.upload-area.dragover {
    border-color: var(--primary);
    background: rgba(37, 99, 235, 0.1);
}

.upload-icon {
    width: 48px;
    height: 48px;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.upload-content p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.upload-content span {
    color: var(--primary);
    font-weight: 500;
}

.image-preview {
    width: 100%;
    height: 100%;
    max-height: 200px;
    object-fit: contain;
    position: absolute;
    top: 0;
    left: 0;
    background: #0f172a;
    padding: 10px;
}

/* Buttons */
.btn-primary {
    width: 100%;
    padding: 0.875rem;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1rem;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-secondary {
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid var(--glass-border);
    color: white;
    border-radius: 6px;
    cursor: pointer;
    font-size: 0.875rem;
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Preview Section */
.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.preview-container {
    background: white;
    /* Signatures are usually on white background emails */
    border-radius: 12px;
    padding: 1rem;
    min-height: 300px;
    color: black;
    overflow-x: auto;
}

.preview-box {
    width: 100%;
    height: 100%;
    min-height: 250px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.placeholder-text {
    color: #94a3b8;
    text-align: center;
}

.actions {
    display: flex;
    gap: 0.5rem;
}

/* Tutorial Section */
.tutorial-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
}

.tutorial-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1.5rem;
}

.tutorial-card h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.tutorial-card ol {
    padding-left: 1.25rem;
    color: var(--text-muted);
    font-size: 0.9rem;
}

.tutorial-card li {
    margin-bottom: 0.75rem;
    line-height: 1.5;
}

@media (max-width: 768px) {
    .tutorial-grid {
        grid-template-columns: 1fr;
    }
}