:root {
    --school-color: #002c77;
    --school-light: rgba(0, 44, 119, 0.1);
    --school-dark: #001d4f;
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --radius: 16px;
    --radius-md: 12px;
    --radius-sm: 8px;
    --transition: all 0.2s ease;
}

[data-theme="dark"] {
    --school-color: #5b8fd9;
    --school-light: rgba(91, 143, 217, 0.15);
    --school-dark: #7aa3e0;
    --bg-primary: #0a0a0f;
    --bg-secondary: #14141f;
    --bg-tertiary: #1e1e2d;
    --text-primary: #f5f5f7;
    --text-secondary: #b0b0c0;
    --text-muted: #808090;
    --border: #2a2a3d;
}

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

body {
    font-family: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 24px;
    transition: var(--transition);
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    border: 1px solid var(--border);
    background: var(--bg-secondary);
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    font-size: 18px;
}

.theme-toggle:hover {
    background: var(--bg-tertiary);
}

.is-hidden {
    display: none;
}

.container {
    width: 100%;
    max-width: 480px;
}

.card {
    background: var(--bg-secondary);
    border-radius: var(--radius);
    padding: 32px;
    box-shadow: var(--shadow-lg);
}

.header {
    text-align: center;
    margin-bottom: 28px;
}

.logo-wrapper {
    width: 64px;
    height: 64px;
    margin: 0 auto 16px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.logo-wrapper img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

.header h1 {
    font-size: 22px;
    font-weight: 700;
    color: var(--school-color);
    margin-bottom: 6px;
}

.header p {
    font-size: 14px;
    color: var(--text-secondary);
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-input {
    width: 100%;
    padding: 14px 16px;
    font-size: 15px;
    font-family: inherit;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    outline: none;
    transition: var(--transition);
}

.form-input::placeholder {
    color: var(--text-muted);
}

.form-input:focus {
    border-color: var(--school-color);
    background: var(--bg-secondary);
    box-shadow: 0 0 0 3px var(--school-light);
}

.btn {
    width: 100%;
    padding: 14px 24px;
    font-size: 15px;
    font-weight: 600;
    font-family: inherit;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-primary {
    background: var(--school-color);
    color: white;
}

.btn-primary:hover {
    background: var(--school-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 110, 183, 0.3);
}

.btn svg {
    width: 18px;
    height: 18px;
}

.qr-output {
    margin-top: 28px;
    text-align: center;
    display: none;
}

.qr-output.visible {
    display: block;
    animation: fadeIn 0.3s ease;
}

.qr-frame {
    display: inline-block;
    background: white;
    padding: 16px;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow);
    position: relative;
}

.qr-frame canvas {
    display: block;
}

.download-section {
    margin-top: 20px;
}

.filename-group {
    margin-bottom: 12px;
}

.filename-group .form-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 6px;
    text-align: center;
}

.filename-group .form-input {
    width: 100%;
    padding: 10px 12px;
    font-size: 14px;
    text-align: center;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.filename-group .form-input:focus {
    outline: none;
    border-color: var(--school-color);
    box-shadow: 0 0 0 3px var(--school-light);
}

.download-btns {
    display: flex;
    gap: 10px;
    justify-content: center;
}

.btn-secondary {
    flex: 1;
    max-width: 100px;
    padding: 10px 14px;
    font-size: 13px;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border);
}

.btn-secondary:hover {
    background: var(--school-light);
    border-color: var(--school-color);
    color: var(--school-color);
}

.back-link {
    display: block;
    text-align: center;
    margin-top: 20px;
    color: var(--text-secondary);
    font-size: 13px;
    text-decoration: none;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--school-color);
}

.school-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    background: var(--school-light);
    color: var(--school-color);
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    margin-bottom: 12px;
}

.options-section {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

.options-row {
    display: flex;
    gap: 12px;
}

.options-row--spaced {
    margin-top: 12px;
}

.option-group {
    flex: 1;
}

.option-label {
    display: block;
    font-size: 12px;
    font-weight: 500;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.option-buttons {
    display: flex;
    gap: 8px;
}

.option-btn {
    flex: 1;
    padding: 10px 8px;
    border: 2px solid var(--border);
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.option-btn:hover {
    border-color: var(--border);
    background: var(--bg-secondary);
}

.option-btn.active {
    border-color: var(--school-color);
    background: var(--school-light);
}

.option-btn img {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

.option-btn span {
    font-size: 11px;
    font-weight: 500;
    color: var(--text-secondary);
}

.option-btn.active span {
    color: var(--school-color);
}

.color-preview {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    border: 2px solid rgba(0, 0, 0, 0.1);
}

.color-preview--marine {
    background: #002c77;
}

.color-preview--light-blue {
    background: #006eb7;
}

.color-preview--white {
    background: #ffffff;
    border-color: #e2e8f0;
}

.no-logo-icon {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    color: var(--text-muted);
    background: var(--bg-tertiary);
    border-radius: 6px;
}

.transparent-preview {
    width: 28px;
    height: 28px;
    border-radius: 6px;
    background:
        linear-gradient(45deg, #ccc 25%, transparent 25%),
        linear-gradient(-45deg, #ccc 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, #ccc 75%),
        linear-gradient(-45deg, transparent 75%, #ccc 75%);
    background-size: 8px 8px;
    background-position: 0 0, 0 4px, 4px -4px, -4px 0;
    border: 2px solid rgba(0, 0, 0, 0.1);
}

@media (max-width: 520px) {
    .card {
        padding: 24px 20px;
    }

    .theme-toggle {
        top: 12px;
        right: 12px;
    }

    .options-row {
        flex-direction: column;
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(10px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}