:root {
    --bg-color: #050505;
    --card-bg: #0a0a0a;
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent-cyan: #00f2ff;
    --accent-magenta: #ff00e5;
    --accent-purple: #7000ff;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* UI Layout */
.app-container {
    display: grid;
    grid-template-columns: 400px 1fr;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar Editor */
.editor-sidebar {
    background: #111;
    border-right: 1px solid var(--glass-border);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    overflow-y: auto;
}

.editor-header {
    margin-bottom: 1rem;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    letter-spacing: -0.05em;
    background: linear-gradient(90deg, var(--accent-cyan), var(--accent-magenta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-secondary);
    font-weight: 600;
}

input, textarea {
    background: #1a1a1a;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.75rem;
    color: white;
    font-size: 0.9rem;
    transition: all 0.2s;
}

input:focus, textarea:focus {
    outline: none;
    border-color: var(--accent-cyan);
    background: #222;
}

textarea {
    resize: vertical;
    min-height: 100px;
}

.btn-export {
    margin-top: auto;
    background: linear-gradient(135deg, var(--accent-cyan), var(--accent-purple));
    color: black;
    border: none;
    border-radius: 8px;
    padding: 1rem;
    font-weight: 700;
    cursor: pointer;
    transition: transform 0.2s, filter 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.btn-export:hover {
    transform: translateY(-2px);
    filter: brightness(1.1);
}

/* Preview Area */
.preview-area {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    background-image: radial-gradient(circle at 50% 50%, #1a1a1a 0%, #050505 100%);
    overflow-y: auto;
}

/* THE CARD DESIGN */
#card-to-export {
    width: 600px;
    height: 800px;
    background: var(--card-bg);
    position: relative;
    overflow: hidden;
    padding: 2.5rem 2rem;
    display: flex;
    flex-direction: column;
    box-shadow: 0 40px 100px rgba(0,0,0,0.5);
}

/* Cyber Background Elements */
.card-bg-decoration {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    z-index: 0;
}

.circle-grad {
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.15;
}

.blue-grad { top: -100px; right: -100px; background: var(--accent-cyan); }
.pink-grad { bottom: -100px; left: -100px; background: var(--accent-magenta); }

.grid-overlay {
    position: absolute;
    inset: 0;
    background-image: radial-gradient(var(--glass-border) 1px, transparent 1px);
    background-size: 30px 30px;
    opacity: 0.2;
}

/* Content */
.card-content {
    position: relative;
    z-index: 10;
    height: 100%;
    display: flex;
    flex-direction: column;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.lesson-badge {
    background: rgba(var(--accent-cyan), 0.1);
    border: 1px solid var(--accent-cyan);
    color: var(--accent-cyan);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.card-title {
    font-size: 2rem;
    font-weight: 900;
    line-height: 1.1;
    margin-bottom: 1rem;
    background: linear-gradient(to bottom, #fff, #aaa);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.section {
    margin-bottom: 0.75rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    padding: 1.25rem 1.5rem;
    border-radius: 16px;
    position: relative;
    overflow: hidden;
}

.section::before {
    content: '';
    position: absolute;
    left: 0; top: 0; bottom: 0;
    width: 4px;
    background: var(--accent-cyan);
}

.section.magenta::before { background: var(--accent-magenta); }
.section.purple::before { background: var(--accent-purple); }

.section-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--accent-cyan);
    font-weight: 800;
    margin-bottom: 0.25rem;
    display: block;
    letter-spacing: 0.1em;
}

.section.magenta .section-label { color: var(--accent-magenta); }
.section.purple .section-label { color: var(--accent-purple); }

.section-content {
    font-size: 0.85rem;
    line-height: 1.5;
    color: rgba(255,255,255,0.9);
    white-space: pre-line;
}

.card-footer {
    margin-top: auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--glass-border);
    padding-top: 1rem;
}

.footer-logo {
    font-weight: 900;
    font-size: 1.2rem;
    letter-spacing: -0.02em;
}

.footer-logo span { color: var(--accent-cyan); }

.footer-info {
    font-size: 0.7rem;
    color: var(--text-secondary);
    text-align: right;
}