:root {
    /* Modern Dark Color System */
    --color-bg: #0d1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #1c2128;
    --color-bg-elevated: #21262d;
    --color-bg-overlay: #2d333b;

    --color-border: #30363d;
    --color-border-hover: #484f58;
    --color-border-active: #58a6ff;

    --color-text-primary: #c9d1d9;
    --color-text-secondary: #8b949e;
    --color-text-muted: #6e7681;

    --color-accent: #58a6ff;
    --color-accent-hover: #79c0ff;
    --color-accent-emphasis: #1f6feb;

    --color-success: #3fb950;
    --color-warning: #d29922;
    --color-danger: #f85149;

    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.6);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 6px;
    --radius-lg: 8px;
    --radius-xl: 12px;

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans', Helvetica, Arial, sans-serif;
    --font-mono: ui-monospace, SFMono-Regular, 'SF Mono', Menlo, Consolas, 'Liberation Mono', monospace;
}

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

body {
    font-family: var(--font-sans);
    background: var(--color-bg);
    color: var(--color-text-primary);
    line-height: 1.6;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-lg);
}

/* Header */
.header {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.logo-icon {
    width: 48px;
    height: 48px;
    color: var(--color-accent);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin: 0;
    letter-spacing: -0.025em;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    margin-top: 0.25rem;
    font-weight: 400;
}

/* Logout Button */
.logout-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    text-decoration: none;
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s ease;
    cursor: pointer;
}

.logout-btn:hover {
    background: var(--color-bg-overlay);
    border-color: var(--color-danger);
    color: var(--color-danger);
}

/* Card Grid */
.card-grid {
    display: grid;
    gap: var(--spacing-lg);
}

/* Cards */
.card {
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: border-color 0.2s ease;
}

.card:hover {
    border-color: var(--color-border-hover);
}

.card-title {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
    padding-bottom: var(--spacing-md);
    border-bottom: 1px solid var(--color-border);
}

/* Type Selector */
.item-type-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
    gap: var(--spacing-md);
}

.type-btn {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    position: relative;
}

.type-btn:hover {
    border-color: var(--color-accent);
    background: var(--color-bg-overlay);
}

.type-btn.active {
    background: var(--color-accent-emphasis);
    border-color: var(--color-accent);
    color: var(--color-text-primary);
}

.type-btn .icon {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
}

/* Form Styles */
.item-form {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-md);
}

label {
    font-weight: 500;
    font-size: 0.875rem;
    color: var(--color-text-primary);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.required {
    color: var(--color-danger);
}

.hint {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin-top: 0.25rem;
}

.help-text {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    line-height: 1.5;
    padding: var(--spacing-sm);
    background: var(--color-bg-tertiary);
    border-left: 3px solid var(--color-accent);
    border-radius: var(--radius-sm);
    margin-top: var(--spacing-xs);
}

input[type="text"],
input[type="number"],
textarea,
select {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-primary);
    font-family: var(--font-mono);
    font-size: 0.875rem;
    transition: all 0.2s ease;
    width: 100%;
}

input[type="text"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--color-accent);
    background: var(--color-bg-overlay);
    box-shadow: 0 0 0 3px rgba(88, 166, 255, 0.1);
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
}

textarea {
    resize: vertical;
    min-height: 80px;
    font-family: var(--font-mono);
}

select {
    cursor: pointer;
}

.divider {
    height: 1px;
    background: var(--color-border);
    margin: var(--spacing-lg) 0;
}

.section-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-weight: 400;
    color: var(--color-text-primary);
    font-size: 0.875rem;
}

input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: var(--color-accent);
}

/* Advanced Section */
.advanced-section {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
}

.advanced-section summary {
    cursor: pointer;
    font-weight: 500;
    color: var(--color-text-primary);
    user-select: none;
    list-style: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.875rem;
}

.advanced-section summary::-webkit-details-marker {
    display: none;
}

.advanced-section summary::before {
    content: '▶';
    transition: transform 0.2s ease;
    display: inline-block;
    color: var(--color-text-secondary);
    font-size: 0.75rem;
}

.advanced-section[open] summary::before {
    transform: rotate(90deg);
}

.advanced-section .form-group {
    margin-top: var(--spacing-md);
}

/* Buttons */
.btn-primary,
.btn-secondary,
.btn-add,
.btn-remove {
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-family: var(--font-sans);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    border: 1px solid transparent;
}

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

.btn-primary:hover {
    background: var(--color-accent);
    border-color: var(--color-accent);
}

.btn-primary:active {
    background: var(--color-accent-emphasis);
    transform: scale(0.98);
}

.btn-secondary {
    background: var(--color-bg-tertiary);
    color: var(--color-text-primary);
    border-color: var(--color-border);
}

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

/* Dynamic Lists for Recipes */
.dynamic-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-sm);
}

.dynamic-item {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    display: flex;
    gap: var(--spacing-sm);
    align-items: flex-start;
    transition: all 0.2s ease;
}

.dynamic-item:hover {
    border-color: var(--color-border-hover);
}

.dynamic-item input,
.dynamic-item select {
    flex: 1;
    min-width: 0;
}

.dynamic-item .item-inputs {
    display: flex;
    gap: var(--spacing-sm);
    flex: 1;
    flex-wrap: wrap;
}

.dynamic-item .item-inputs>* {
    flex: 1;
    min-width: 120px;
}

.btn-remove {
    background: var(--color-bg-overlay);
    border-color: var(--color-border);
    color: var(--color-danger);
    padding: var(--spacing-sm) var(--spacing-md);
    white-space: nowrap;
}

.btn-remove:hover {
    background: rgba(248, 81, 73, 0.1);
    border-color: var(--color-danger);
}

.btn-add {
    background: var(--color-bg-tertiary);
    border: 1px dashed var(--color-border);
    color: var(--color-text-secondary);
    padding: var(--spacing-md);
    width: 100%;
    margin-top: var(--spacing-xs);
}

.btn-add:hover {
    border-color: var(--color-accent);
    border-style: solid;
    color: var(--color-accent);
    background: var(--color-bg-overlay);
}

/* Output Area */
.output-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
}

.button-group {
    display: flex;
    gap: var(--spacing-sm);
}

.output-area {
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg);
    min-height: 300px;
    max-height: 600px;
    overflow: auto;
}

.placeholder {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 268px;
    color: var(--color-text-muted);
    text-align: center;
}

.placeholder-icon {
    width: 64px;
    height: 64px;
    color: var(--color-border-hover);
    margin-bottom: var(--spacing-md);
}

.placeholder p {
    margin: 0.25rem 0;
    font-size: 0.875rem;
}

.placeholder-sub {
    font-size: 0.8125rem;
    color: var(--color-text-muted);
}

pre {
    margin: 0;
    font-family: var(--font-mono);
    font-size: 0.8125rem;
    line-height: 1.6;
    overflow-x: auto;
}

code {
    font-family: var(--font-mono);
    font-size: 0.875rem;
    color: var(--color-text-primary);
}

.file-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-md);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
}

.file-info p {
    margin: 0.5rem 0;
    font-size: 0.875rem;
}

.file-info strong {
    color: var(--color-accent);
    font-weight: 600;
}

.file-info code {
    color: var(--color-text-secondary);
}

/* Footer */
.footer {
    margin-top: var(--spacing-2xl);
    padding: var(--spacing-lg);
    text-align: center;
    color: var(--color-text-muted);
    font-size: 0.8125rem;
    border-top: 1px solid var(--color-border);
}

/* Conditional Fields */
.conditional-fields {
    display: none;
}

/* Scrollbar Styles */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-tertiary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border-hover);
    border-radius: var(--radius-sm);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: var(--spacing-md);
    }

    .header {
        flex-direction: column;
        gap: var(--spacing-md);
        align-items: flex-start;
    }

    .header h1 {
        font-size: 1.5rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .item-type-buttons {
        grid-template-columns: 1fr;
    }

    .card {
        padding: var(--spacing-md);
    }
}

/* Background Effect - Subtle */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(ellipse at top, rgba(88, 166, 255, 0.03) 0%, transparent 50%);
    pointer-events: none;
    z-index: -1;
}