:root {
    /* Color Palette - Refined organic tones */
    --color-primary: #3a6766;
    --color-primary-light: #4a8280;
    --color-primary-dark: #2a4f4e;
    --color-secondary: #d7722e;
    --color-secondary-hover: #c26428;
    --color-accent: #a04800;
    --color-background: #f9f9f5;
    --color-surface: #ffffff;
    --color-surface-alt: #eceadf;
    --color-text: #3a6766;
    --color-text-light: #6a9695;
    --color-border: #cae2e2;
    --color-error: #c44;
    --color-success: #4a8280;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    
    /* Typography */
    --font-display: 'Alata', sans-serif;
    --font-body: 'Alata', sans-serif;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(58, 103, 102, 0.1);
    --shadow-md: 0 4px 6px rgba(58, 103, 102, 0.15);
    --shadow-lg: 0 10px 20px rgba(58, 103, 102, 0.2);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
}

* {
    box-sizing: border-box;
}

body {
    font-family: var(--font-body);
    background: linear-gradient(135deg, #f9f9f5 0%, #eceadf 100%);
    color: var(--color-text);
    margin: 0;
    padding: 0;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    font-size: 16px;
    line-height: 1.6;
}

/* Header */
#header {
    font-family: var(--font-display);
    background: linear-gradient(135deg, var(--color-border) 0%, #b8d5d5 100%);
    color: var(--color-primary);
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

#title {
    font-size: 2rem;
    font-weight: 200;
    margin: 0;
    display: flex;
    align-items: baseline;
    gap: var(--spacing-sm);
}

#version {
    font-size: 0.875rem;
    opacity: 0.7;
    font-weight: 400;
}

/* Hamburger Menu Button */
.menu-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: transform var(--transition-fast);
}

.menu-btn:hover {
    transform: scale(1.1);
}

.menu-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.hamburger {
    display: flex;
    flex-direction: column;
    gap: 4px;
    width: 24px;
}

.hamburger span {
    display: block;
    height: 3px;
    background: var(--color-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

.menu-btn[aria-expanded="true"] .hamburger span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.menu-btn[aria-expanded="true"] .hamburger span:nth-child(2) {
    opacity: 0;
}

.menu-btn[aria-expanded="true"] .hamburger span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* App Container */
.app-container {
    display: flex;
    flex: 1;
    position: relative;
    overflow: hidden;
}

/* Main Content */
#main {
    flex: 1;
    padding: var(--spacing-xs);
    max-width: 640px;
    margin: 0 auto;
    width: 100%;
}

/* Help Panel */
.help-panel {
    position: fixed;
    top: 0;
    right: -400px;
    width: 400px;
    height: 100vh;
    background: var(--color-surface);
    box-shadow: var(--shadow-lg);
    z-index: 200;
    transition: right var(--transition-slow);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.help-panel.open {
    right: 0;
}

.help-panel-header {
    background: linear-gradient(135deg, var(--color-border) 0%, #b8d5d5 100%);
    padding: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    border-bottom: 2px solid var(--color-primary-light);
}

.help-panel-header h2 {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--color-primary);
    margin: 0;
}

.close-btn {
    background: transparent;
    border: none;
    font-size: 2rem;
    color: var(--color-primary);
    cursor: pointer;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-full);
    transition: all var(--transition-fast);
}

.close-btn:hover {
    background: rgba(58, 103, 102, 0.1);
    transform: rotate(90deg);
}

.close-btn:focus {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.help-panel-content {
    flex: 1;
    overflow-y: auto;
    padding: var(--spacing-lg);
}

.help-panel-content section {
    margin-bottom: var(--spacing-xl);
}

.help-panel-content section:last-child {
    margin-bottom: 0;
}

.help-panel-content h3 {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: 0 0 var(--spacing-sm) 0;
}

.help-panel-content p {
    margin: 0 0 var(--spacing-md) 0;
    line-height: 1.7;
}

.help-panel-content ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.help-panel-content li {
    padding: var(--spacing-xs) 0;
}

.help-panel-content kbd {
    background: var(--color-surface-alt);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    padding: 2px 6px;
    font-family: var(--font-body);
    font-size: 0.875rem;
}

.about-section {
    border-top: 1px solid var(--color-border);
    padding-top: var(--spacing-md);
    margin-top: var(--spacing-xl);
    text-align: center;
}

.about-section a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
}

.about-section a:hover {
    text-decoration: underline;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 150;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
}

.overlay.active {
    opacity: 1;
    pointer-events: auto;
}

.intro {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-sm);
    text-align: center;
    color: var(--color-text-light);
}

/* Form */
#garnform {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

#rows {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
}

/* Row Design */
.row {
    background: var(--color-surface);
    border: 2px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr auto 1fr auto auto;
    gap: var(--spacing-sm);
    align-items: center;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    animation: slideIn var(--transition-base);
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.row:hover {
    border-color: var(--color-primary-light);
    box-shadow: var(--shadow-md);
}

.row:focus-within {
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(58, 103, 102, 0.1);
}

.row input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.125rem;
    font-family: var(--font-body);
    text-align: right;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-background);
    color: var(--color-text);
    transition: all var(--transition-fast);
}

.row input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px rgba(58, 103, 102, 0.1);
}

.row input::placeholder {
    color: var(--color-text-light);
    opacity: 0.6;
}

.row .unit {
    color: var(--color-text-light);
    font-size: 1rem;
    font-weight: 400;
    white-space: nowrap;
}

.remove-btn {
    background: var(--color-accent);
    color: white;
    border: none;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: var(--radius-full);
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.remove-btn:hover {
    background: #8a3e00;
    transform: scale(1.1) rotate(90deg);
}

.remove-btn:focus {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}

.remove-btn:active {
    transform: scale(0.95) rotate(90deg);
}

/* Add Button */
.add-button {
    width: 100%;
    padding: var(--spacing-xs);
    font-size: 1.125rem;
    font-family: var(--font-display);
    background: var(--color-secondary);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    box-shadow: var(--shadow-sm);
    font-weight: 400;
}

.add-button:hover {
    background: var(--color-secondary-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.add-button:focus {
    outline: 3px solid rgba(215, 114, 46, 0.3);
    outline-offset: 2px;
}

.add-button:active {
    transform: translateY(0);
}

.add-icon {
    font-size: 1.5rem;
    font-weight: bold;
}

/* Result Box */
.xresult-box {
    background: linear-gradient(135deg, var(--color-surface) 0%, var(--color-surface-alt) 100%);
    border: 2px solid var(--color-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    /*position: relative;*/
    overflow: hidden;
}

.result-box::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    /*background: linear-gradient(90deg, var(--color-primary) 0%, var(--color-primary-light) 100%);*/
}

.result-label {
    font-size: 1rem;
    color: var(--color-text-light);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: 600;
}

.result-row {
    background: var(--color-surface);
    border: 2px solid var(--color-primary-light);
    border-radius: var(--radius-lg);
    padding: var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr auto 1fr auto;
    gap: var(--spacing-sm);
    align-items: center;
    box-shadow: var(--shadow-md);
}

.result-input {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1.5rem;
    font-family: var(--font-display);
    font-weight: 400;
    text-align: right;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    background: var(--color-background);
    color: var(--color-primary);
    transition: all var(--transition-fast);
}

.result-input:focus {
    outline: none;
    border-color: var(--color-primary);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px rgba(58, 103, 102, 0.1);
    color: var(--color-primary-dark);
}

.result-input:hover {
    border-color: var(--color-primary-light);
}

.result-row .unit {
    color: var(--color-text-light);
    font-size: 1.25rem;
    font-weight: 400;
    white-space: nowrap;
}

.calculation-indicator {
    margin-top: var(--spacing-xs);
    font-size: 0.875rem;
    color: var(--color-text-light);
    text-align: center;
    min-height: 1.5rem;
    font-style: italic;
}

/* Update Notification */
#update-notification {
    position: fixed;
    bottom: -100px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--color-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    transition: bottom var(--transition-slow);
    max-width: 90%;
}

#update-notification.show {
    bottom: var(--spacing-lg);
}

.update-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
    justify-content: center;
}

.update-content button {
    background: white;
    color: var(--color-primary);
    border: none;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-weight: 600;
}

.update-content button:hover {
    background: var(--color-surface-alt);
    transform: scale(1.05);
}

/* Accessibility - Focus Indicators */
*:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

/* Responsive Design */
@media (min-width: 11200px) {
    .app-container {
        max-width: 11200px;
        margin: 0 auto;
    }
    
    .help-panel {
        position: static;
        width: 350px;
        height: auto;
        border-left: 2px solid var(--color-border);
        box-shadow: none;
    }
    
    .help-panel.open {
        right: auto;
    }
    
    .overlay {
        display: none;
    }
    
    .menu-btn {
        display: none;
    }
    
    #main {
        margin: 0;
        margin-right: var(--spacing-lg);
    }
}

@media (max-width: 640px) {
    #title {
        font-size: 1.5rem;
    }
    
    #main {
        padding: var(--spacing-md);
    }
    
    .help-panel {
        width: 100%;
        right: -100%;
    }
    
    .help-panel.open {
        right: 0;
    }
    
    .row {
        grid-template-columns: 1fr auto 1fr auto auto;
        gap: var(--spacing-xs);
        padding: var(--spacing-sm);
    }
    
    .row input {
        font-size: 1rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        min-width: 0;
    }
    
    .row .unit {
        font-size: 0.875rem;
    }
    
    .remove-btn {
        width: 2rem;
        height: 2rem;
        font-size: 1.25rem;
    }
    
    .result-row {
        grid-template-columns: 1fr auto 1fr auto;
        gap: var(--spacing-xs);
    }
    
    .result-input {
        font-size: 1.125rem;
        padding: var(--spacing-xs) var(--spacing-sm);
        min-width: 0;
    }
    
    .result-row .unit {
        font-size: 0.875rem;
    }
}

@media (max-width: 400px) {
    #header {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    #title {
        font-size: 1.25rem;
    }
    
    #logo {
        height: 2rem;
    }
    
    .editable-result {
        font-size: 2rem;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
    }
    
    #header,
    #footer,
    .add-button,
    .remove-btn,
    #update-notification {
        display: none;
    }
    
    .row {
        break-inside: avoid;
    }
}

/* Reduced Motion */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --color-border: #000;
        --shadow-sm: none;
        --shadow-md: none;
        --shadow-lg: none;
    }
    
    .row,
    .result-box,
    .help-section {
        border-width: 3px;
    }
}