:root {
    --primary: #f472b6;
    /* Pink accent */
    --primary-dark: #db2777;
    --bg-dark: #0f172a;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --text-main: #f8fafc;
    --text-dim: #94a3b8;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    -webkit-tap-highlight-color: transparent;
}

body {
    font-family: 'Pretendard', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    padding: 40px 20px;
}

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

header {
    text-align: center;
    margin-bottom: 40px;
}

.logo-icon {
    font-size: 3.5rem;
}

h1 {
    font-size: 3rem;
    font-weight: 900;
}

.subtitle {
    font-size: 1.25rem;
    color: var(--text-dim);
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 30px;
}

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

.upload-box {
    border: 3px dashed var(--glass-border);
    border-radius: 20px;
    padding: 60px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s;
}

.upload-box:hover {
    border-color: var(--primary);
    background: rgba(244, 114, 182, 0.05);
}

.upload-btn {
    margin-top: 20px;
    background: var(--primary);
    color: white;
    border: none;
    padding: 15px 40px;
    border-radius: 12px;
    font-size: 1.2rem;
    font-weight: 700;
    cursor: pointer;
}

/* Editor Section */
.editor-section.hidden {
    display: none;
}

.canvas-container {
    margin-bottom: 25px;
    display: flex;
    justify-content: center;
    overflow: hidden;
    background: #000;
    /* Dark background for transparent preview */
}

#mainCanvas {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
}

.controls {
    display: flex;
    flex-direction: column;
    gap: 25px;
}

.control-item label {
    display: block;
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--primary);
}

input[type="range"] {
    width: 100%;
    height: 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
    outline: none;
    cursor: pointer;
}

.hint {
    font-size: 0.95rem;
    color: var(--text-dim);
    margin-top: 10px;
}

.action-buttons {
    display: flex;
    gap: 15px;
}

.primary-btn {
    flex: 2;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    padding: 20px;
    border-radius: 12px;
    font-size: 1.3rem;
    font-weight: 800;
    cursor: pointer;
}

.secondary-btn {
    flex: 1;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 1px solid var(--glass-border);
    padding: 20px;
    border-radius: 12px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
}

.ad-slot {
    margin-top: 40px;
    text-align: center;
    border: 2px dashed var(--glass-border);
}

footer {
    text-align: center;
    margin-top: 60px;
    color: var(--text-dim);
    padding-bottom: 40px;
}

@media (max-width: 600px) {
    body {
        padding: 20px 10px;
    }

    h1 {
        font-size: 2.22rem;
    }

    .logo-icon {
        font-size: 2.5rem;
    }

    .glass {
        padding: 20px;
    }

    .upload-box {
        padding: 40px 20px;
    }

    .primary-btn {
        font-size: 1.15rem;
        padding: 15px;
    }

    .action-buttons {
        flex-direction: column;
    }

    .control-item label {
        font-size: 1.1rem;
    }
}