:root {
    /* White Theme (Default) - Softer Indigo */
    --bg-color: #f8fafc;
    --card-bg: #ffffff;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --border-color: #e2e8f0;
    --header-bg: #ffffff;
    --footer-bg: #f1f5f9;
}

body.theme-blue {
    /* Blue Theme - Powder Blue */
    --bg-color: #eff6ff;
    --card-bg: #ffffff;
    --text-main: #1e3a8a;
    --text-muted: #3b82f6;
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --border-color: #dbeafe;
    --header-bg: #ffffff;
    --footer-bg: #dbeafe;
}

body.theme-black {
    /* Black Theme - Soft Charcoal */
    --bg-color: #0f172a;
    --card-bg: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --primary-color: #38bdf8;
    --primary-hover: #0ea5e9;
    --border-color: #334155;
    --header-bg: #1e293b;
    --footer-bg: #0f172a;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.4s ease, color 0.4s ease;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 1.5rem;
    width: 100%;
}

/* Header */
.header {
    background-color: var(--header-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 0;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05);
    transition: background-color 0.4s ease;
    animation: slideDown 0.6s ease-out;
}

.header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary-color);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.main-logo {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.1;
}

.sub-logo {
    font-size: 0.7rem;
    font-weight: 500;
    color: var(--text-muted);
}

.theme-switcher {
    display: flex;
    gap: 0.5rem;
    background: var(--bg-color);
    padding: 0.25rem;
    border-radius: 999px;
    border: 1px solid var(--border-color);
}

.theme-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-muted);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

.theme-btn.active {
    background: var(--card-bg);
    color: var(--primary-color);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
}

.generator-card {
    background-color: var(--card-bg);
    border-radius: 1.5rem;
    border: 1px solid var(--border-color);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    padding: 2.5rem;
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    animation: fadeInUp 0.8s cubic-bezier(0.16, 1, 0.3, 1);
    max-width: 900px;
    width: 100%;
}

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

    .main-content {
        padding: 2rem 0;
    }
}

.input-section h2 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.input-group,
.options-group {
    margin-bottom: 1.5rem;
}

.input-group label,
.options-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-muted);
    font-size: 0.9rem;
}

#qr-input,
#qr-size,
.qr-input-field {
    width: 100%;
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background-color: var(--bg-color);
    color: var(--text-main);
    font-size: 1rem;
    outline: none;
    transition: all 0.3s ease;
}

#qr-input:focus,
.qr-input-field:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Type Selector */
.type-selector {
    margin-bottom: 2rem;
}

.label-sm {
    display: block;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
}

.type-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.75rem;
}

@media (max-width: 480px) {
    .type-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.type-item {
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    padding: 0.75rem 0.5rem;
    border-radius: 1rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    color: var(--text-muted);
}

.type-item i {
    width: 1.25rem;
    height: 1.25rem;
}

.type-item span {
    font-size: 0.75rem;
    font-weight: 600;
}

.type-item:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
    transform: translateY(-2px);
}

.type-item.active {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.2);
}

/* Dynamic Inputs */
.input-group {
    display: none;
    animation: fadeIn 0.4s ease-out;
}

.input-group.active {
    display: block;
}

.input-prefix-wrapper {
    display: flex;
    align-items: center;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: 0.75rem;
    overflow: hidden;
    transition: all 0.3s;
}

.input-prefix-wrapper:focus-within {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.prefix {
    padding: 0 1rem;
    color: var(--text-muted);
    font-weight: 600;
    border-right: 1px solid var(--border-color);
}

.input-prefix-wrapper input {
    border: none !important;
    box-shadow: none !important;
    border-radius: 0 !important;
}

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

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

/* Customization Section */
.customization-section {
    margin-bottom: 2rem;
}

.color-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

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

.color-input-group label {
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
}

.color-input-group input[type="color"] {
    width: 100%;
    height: 3rem;
    padding: 0.25rem;
    border-radius: 0.75rem;
    border: 1px solid var(--border-color);
    background: var(--bg-color);
    cursor: pointer;
    transition: all 0.3s;
}

.color-input-group input[type="color"]:hover {
    border-color: var(--primary-color);
    transform: translateY(-2px);
}

/* Preview Section */
.preview-section {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    background: var(--bg-color);
    border-radius: 1rem;
    padding: 2rem;
}

.qr-container {
    background: white;
    padding: 2rem;
    border-radius: 1.5rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    aspect-ratio: 1 / 1;
    max-width: 350px;
    margin: 0 auto;
}

.qr-container canvas {
    max-width: 100%;
    height: auto !important;
    display: block;
}

.file-input-wrapper {
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    background: var(--bg-color);
    border: 1px dashed var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 0.75rem;
    cursor: pointer;
    transition: all 0.3s;
    color: var(--text-muted);
    font-weight: 500;
    font-size: 0.9rem;
}

.file-input-wrapper:hover {
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.file-input-wrapper input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.qr-container:hover {
    transform: scale(1.02);
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 2rem;
    border-radius: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    border: none;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Footer */
.footer {
    background-color: var(--footer-bg);
    padding: 3rem 0;
    border-top: 1px solid var(--border-color);
    color: var(--text-muted);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.school-branding {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    background: var(--card-bg);
    padding: 1rem 2rem;
    border-radius: 1rem;
    border: 1px solid var(--border-color);
}

.footer-logo {
    height: 60px;
    width: auto;
}

.school-info {
    text-align: left;
}

.school-info h4 {
    margin: 0;
    font-size: 1.1rem;
    color: var(--text-main);
}

.school-info p {
    margin: 2px 0;
    font-size: 0.85rem;
}

.footer-bottom {
    text-align: center;
    font-size: 0.85rem;
}

.footer-bottom p {
    margin-bottom: 0.5rem;
}

/* Animations */
@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

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

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }

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