:root {
    /* Material Design 3 Color Tokens */
    --primary: #006A50; /* Updated green closer to Material 3 */
    --primary-container: #C4E8D4;
    --secondary: #4A6357;
    --secondary-container: #CCE8DB;
    --surface: #FEFCF5; /* Material 3 background */
    --surface-container: #F4F2EA;
    --surface-variant: #E7E5E0;
    --outline: #777770;
    --outline-variant: #C7C6C1;
    
    /* Elevation */
    --elevation-1: 0 1px 3px 0px rgba(0, 0, 0, 0.12);
    --elevation-2: 0 3px 6px 0px rgba(0, 0, 0, 0.15);
    --elevation-3: 0 6px 12px 0px rgba(0, 0, 0, 0.18);
    
    /* Typography */
    --title-large: 400 1.75rem/2rem 'Roboto', sans-serif;
    --title-medium: 500 1rem/1.5rem 'Roboto', sans-serif;
    --body-large: 400 1rem/1.5rem 'Roboto', sans-serif;
    --body-medium: 400 0.875rem/1.25rem 'Roboto', sans-serif;
    --label-large: 500 0.875rem/1.25rem 'Roboto', sans-serif;
    
    /* Shape */
    --corner-extra-large: 28px;
    --corner-large: 16px;
    --corner-medium: 12px;
    --corner-small: 8px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background-color: var(--surface);
    color: #1C1B1F;
    min-height: 100vh;
    padding: 24px;
    display: flex;
    flex-direction: column;
    align-items: center;
}

/* Header Styles */
.header-container {
    width: 100%;
    max-width: 840px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
    padding: 0 8px;
}

h2 {
    font: var(--title-large);
    color: #1C1B1F;
    margin: 0;
    font-weight: 500;
}

.gear-icon {
    background: var(--surface-container);
    border: none;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    color: var(--secondary);
    box-shadow: var(--elevation-1);
}

.gear-icon:hover {
    background: var(--surface-variant);
    box-shadow: var(--elevation-2);
    transform: translateY(-1px);
}

.gear-icon:active {
    transform: translateY(0);
    box-shadow: var(--elevation-1);
}

/* Main Container */
.container {
    background: var(--surface-container);
    border-radius: var(--corner-large);
    padding: 32px;
    width: 100%;
    max-width: 840px;
    box-shadow: var(--elevation-1);
    border: 1px solid var(--outline-variant);
}

.container:hover {
    box-shadow: var(--elevation-2);
}

.subtitle {
    font: var(--body-medium);
    color: var(--outline);
    text-align: center;
    margin-bottom: 32px;
    padding: 12px;
    background: var(--surface);
    border-radius: var(--corner-medium);
    border: 1px solid var(--outline-variant);
}

/* Form Elements */
label {
    font: var(--label-large);
    color: var(--secondary);
    display: block;
    margin-bottom: 12px;
}

textarea {
    width: 100%;
    height: 320px;
    padding: 16px;
    background: var(--surface);
    border: 2px solid var(--outline-variant);
    border-radius: var(--corner-medium);
    font: var(--body-large);
    font-family: 'Roboto Mono', monospace;
    resize: vertical;
    margin-bottom: 24px;
    transition: border-color 0.2s;
}

textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 2px rgba(0, 106, 80, 0.1);
}

/* Buttons */
.button-container {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn {
    padding: 16px 24px;
    border: none;
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    flex: 1;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    box-shadow: var(--elevation-1);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 5px;
    height: 5px;
    background: rgba(255, 255, 255, 0.5);
    opacity: 0;
    border-radius: 100%;
    transform: scale(1, 1) translate(-50%);
    transform-origin: 50% 50%;
}

.btn:focus:not(:active)::after {
    animation: ripple 1s ease-out;
}

@keyframes ripple {
    0% {
        transform: scale(0, 0);
        opacity: 0.5;
    }
    20% {
        transform: scale(25, 25);
        opacity: 0.3;
    }
    100% {
        opacity: 0;
        transform: scale(40, 40);
    }
}

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

.btn-primary:hover {
    background: #005A44;
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--secondary-container);
    color: var(--secondary);
}

.btn-secondary:hover {
    background: #B8D8C9;
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(28, 27, 31, 0.3);
    backdrop-filter: blur(4px);
    z-index: 1000;
    justify-content: center;
    align-items: center;
    padding: 20px;
    animation: fadeIn 0.2s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: var(--surface);
    border-radius: var(--corner-extra-large);
    padding: 32px;
    width: 100%;
    max-width: 640px;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--elevation-3);
    border: 1px solid var(--outline-variant);
    animation: slideUp 0.3s cubic-bezier(0.2, 0, 0, 1);
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h3 {
    font: var(--title-large);
    color: #1C1B1F;
}

.close-btn {
    background: none;
    border: none;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    font-size: 24px;
    color: var(--outline);
    display: flex;
    align-items: center;
    justify-content: center;
}

.close-btn:hover {
    background: var(--surface-variant);
}

.output-box {
    background: var(--surface-container);
    border: 1px solid var(--outline-variant);
    border-radius: var(--corner-medium);
    padding: 20px;
    font-family: 'Roboto Mono', monospace;
    white-space: pre;
    overflow-x: auto;
    max-height: 300px;
    margin: 20px 0;
    font-size: 14px;
    tab-size: 4;
}

.line-count {
    background: var(--primary-container);
    color: var(--primary);
    padding: 12px 20px;
    border-radius: var(--corner-medium);
    margin-bottom: 16px;
    font: var(--body-medium);
    border-left: 4px solid var(--primary);
}

/* Settings Page */
.settings-page {
    display: none;
    width: 100%;
    max-width: 840px;
    margin-top: 20px;
}

.settings-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 32px;
    padding: 0 8px;
}

.back-btn {
    background: var(--surface-container);
    color: var(--secondary);
    border: 2px solid var(--outline-variant);
    padding: 12px 24px;
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    height: 56px;
}

.back-btn:hover {
    background: var(--surface-variant);
    transform: translateX(-2px);
}

.settings-description {
    background: var(--primary-container);
    padding: 24px;
    border-radius: var(--corner-large);
    margin-bottom: 32px;
    border: 1px solid rgba(0, 106, 80, 0.1);
}

.settings-description p {
    margin-bottom: 12px;
    font: var(--body-medium);
}

.settings-description strong {
    color: var(--primary);
}

/* Import/Export Buttons */
.import-export-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 24px;
}

.btn-import, .btn-export {
    flex: 1;
    padding: 16px;
    border: 2px solid var(--outline-variant);
    background: var(--surface);
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    height: 56px;
}

.btn-import:hover, .btn-export:hover {
    background: var(--surface-variant);
    transform: translateY(-2px);
    box-shadow: var(--elevation-2);
}

.btn-export {
    border-color: var(--primary);
    color: var(--primary);
}

.btn-add {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    margin-bottom: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    height: 56px;
}

.btn-add:hover {
    background: #005A44;
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

/* Table */
.expander-table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    background: var(--surface);
    border-radius: var(--corner-large);
    overflow: hidden;
    box-shadow: var(--elevation-1);
    margin-bottom: 32px;
}

.expander-table th {
    background: var(--primary);
    color: white;
    padding: 20px;
    text-align: left;
    font: var(--label-large);
    font-weight: 500;
}

.expander-table td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--outline-variant);
    font: var(--body-medium);
}

.expander-table tr:last-child td {
    border-bottom: none;
}

.expander-table tr:hover {
    background: var(--surface-variant);
}

.keyword-input, .snippet-input {
    width: 100%;
    padding: 12px;
    background: var(--surface-container);
    border: 2px solid var(--outline-variant);
    border-radius: var(--corner-small);
    font: var(--body-medium);
    font-family: 'Roboto Mono', monospace;
}

.keyword-input:focus, .snippet-input:focus {
    outline: none;
    border-color: var(--primary);
}

.snippet-input {
    min-height: 80px;
    resize: vertical;
}

.btn-delete {
    background: transparent;
    color: #BA1A1A;
    border: 2px solid #F9DEDC;
    padding: 8px 16px;
    border-radius: var(--corner-small);
    font: var(--label-large);
    cursor: pointer;
    min-width: 80px;
}

.btn-delete:hover {
    background: #F9DEDC;
    border-color: #BA1A1A;
}

.settings-footer {
    display: flex;
    gap: 16px;
    margin-top: 24px;
}

.btn-reset {
    flex: 1;
    padding: 16px;
    background: var(--surface);
    color: #BA1A1A;
    border: 2px solid #F9DEDC;
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    height: 56px;
}

.btn-reset:hover {
    background: #F9DEDC;
    border-color: #BA1A1A;
    transform: translateY(-2px);
}

.btn-save {
    flex: 2;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--corner-large);
    font: var(--label-large);
    cursor: pointer;
    height: 56px;
}

.btn-save:hover {
    background: #005A44;
    box-shadow: var(--elevation-2);
    transform: translateY(-2px);
}

/* Toast Notification */
.toast {
    position: fixed;
    bottom: 24px;
    right: 24px;
    padding: 16px 24px;
    background: var(--primary);
    color: white;
    border-radius: var(--corner-large);
    font: var(--label-large);
    display: none;
    z-index: 2000;
    box-shadow: var(--elevation-3);
    animation: slideInToast 0.3s cubic-bezier(0.2, 0, 0, 1);
}

@keyframes slideInToast {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.toast.error {
    background: #BA1A1A;
}

.toast.warning {
    background: #FFB302;
    color: #1C1B1F;
}

/* Footnote */
.footnote {
    text-align: center;
    margin-top: 32px;
    padding-top: 24px;
    border-top: 1px solid var(--outline-variant);
    color: var(--outline);
    font: var(--body-medium);
    font-style: italic;
}

/* Responsive */
@media (max-width: 768px) {
    body {
        padding: 16px;
    }
    
    .container, .settings-page {
        padding: 24px;
    }
    
    .button-container,
    .import-export-buttons,
    .settings-footer {
        flex-direction: column;
    }
    
    .btn, .btn-import, .btn-export, .btn-reset, .btn-save {
        width: 100%;
    }
    
    .modal-content {
        padding: 24px;
        max-height: 90vh;
    }
    
    .expander-table {
        display: block;
        overflow-x: auto;
    }
}

/* Add these to your existing styles.css */

/* Error Banner */
.error-banner {
    background: #F9DEDC;
    color: #BA1A1A;
    padding: 16px 20px;
    border-radius: var(--corner-medium);
    border-left: 4px solid #BA1A1A;
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    animation: slideDown 0.3s ease;
}

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

/* Validation Summary */
.validation-summary {
    background: var(--surface);
    border: 2px solid var(--outline-variant);
    border-radius: var(--corner-medium);
    padding: 20px;
    margin-top: 24px;
    margin-bottom: 24px;
}

.validation-summary h4 {
    font: var(--label-large);
    color: var(--secondary);
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.validation-item {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    padding: 12px;
    background: var(--surface-container);
    border-radius: var(--corner-small);
}

.validation-item.valid {
    border-left: 4px solid #006A50;
}

.validation-item.invalid {
    border-left: 4px solid #BA1A1A;
}

.validation-icon {
    font-size: 20px;
}

.validation-text {
    flex: 1;
    font: var(--body-medium);
}

.validation-details {
    font-size: 12px;
    color: var(--outline);
    margin-top: 4px;
}

/* Error highlight in output */
.error-highlight {
    background: #F9DEDC;
    border-left: 3px solid #BA1A1A;
    padding: 8px 12px;
    margin: 4px 0;
    font-family: 'Roboto Mono', monospace;
    font-size: 13px;
}

.error-label {
    display: inline-block;
    background: #BA1A1A;
    color: white;
    padding: 2px 8px;
    border-radius: 4px;
    font-size: 11px;
    margin-right: 8px;
}

/* Warning highlight */
.warning-highlight {
    background: #FFF8E1;
    border-left: 3px solid #FFB302;
    padding: 8px 12px;
    margin: 4px 0;
    font-family: 'Roboto Mono', monospace;
    font-size: 13px;
}

/* Add to your existing styles.css */
.material-icons {
    font-family: 'Material Icons';
    font-weight: normal;
    font-style: normal;
    font-size: 24px;
    line-height: 1;
    letter-spacing: normal;
    text-transform: none;
    display: inline-block;
    white-space: nowrap;
    word-wrap: normal;
    direction: ltr;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
    -moz-osx-font-smoothing: grayscale;
    font-feature-settings: 'liga';
}

.gear-icon .material-icons {
    font-size: 20px;
}

.btn .material-icons,
.back-btn .material-icons,
.btn-add .material-icons,
.btn-import .material-icons,
.btn-export .material-icons,
.btn-save .material-icons {
    font-size: 18px;
}

.line-count .material-icons,
.validation-summary .material-icons {
    font-size: 20px;
    vertical-align: middle;
}

.error-banner .material-icons {
    color: #BA1A1A;
}

.modal-header .material-icons {
    vertical-align: middle;
    margin-right: 8px;
}