/* Material Design 3 Design Tokens */
:root {
    /* Shape */
    --md-sys-shape-corner-none: 0px;
    --md-sys-shape-corner-extra-small: 4px;
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-extra-large: 28px;

    /* Typography */
    --md-sys-typescale-display-large-size: 57px;
    --md-sys-typescale-display-large-weight: 400;
    --md-sys-typescale-display-large-line-height: 64px;

    --md-sys-typescale-headline-large-size: 32px;
    --md-sys-typescale-headline-large-weight: 400;
    --md-sys-typescale-headline-large-line-height: 40px;

    --md-sys-typescale-title-large-size: 22px;
    --md-sys-typescale-title-large-weight: 400;
    --md-sys-typescale-title-large-line-height: 28px;

    --md-sys-typescale-body-large-size: 16px;
    --md-sys-typescale-body-large-weight: 400;
    --md-sys-typescale-body-large-line-height: 24px;

    --md-sys-typescale-body-medium-size: 14px;
    --md-sys-typescale-body-medium-weight: 400;
    --md-sys-typescale-body-medium-line-height: 20px;

    --md-sys-typescale-label-large-size: 14px;
    --md-sys-typescale-label-large-weight: 500;
    --md-sys-typescale-label-large-line-height: 20px;

    --md-sys-typescale-label-medium-size: 12px;
    --md-sys-typescale-label-medium-weight: 500;
    --md-sys-typescale-label-medium-line-height: 16px;
}

/* Classic Theme - Material Design 3 */
[data-theme="classic"] {
    /* Primary colors */
    --md-sys-color-primary: #6750A4;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #EADDFF;
    --md-sys-color-on-primary-container: #21005D;

    /* Surface colors */
    --md-sys-color-surface: #FFFBFE;
    --md-sys-color-on-surface: #1C1B1F;
    --md-sys-color-surface-variant: #E7E0EC;
    --md-sys-color-on-surface-variant: #49454F;

    /* Background */
    --md-sys-color-background: #FFFBFE;
    --md-sys-color-on-background: #1C1B1F;

    /* Secondary */
    --md-sys-color-secondary: #625B71;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #E8DEF8;
    --md-sys-color-on-secondary-container: #1D192B;

    /* Tertiary */
    --md-sys-color-tertiary: #7D5260;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #FFD8E4;
    --md-sys-color-on-tertiary-container: #31111D;

    /* Error */
    --md-sys-color-error: #B3261E;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #F9DEDC;
    --md-sys-color-on-error-container: #410E0B;

    /* Outline */
    --md-sys-color-outline: #79747E;
    --md-sys-color-outline-variant: #CAC4D0;

    /* Success (custom extension) */
    --md-sys-color-success: #4CAF50;
    --md-sys-color-on-success: #FFFFFF;
}

/* Vibrant Theme - Coral, Gold, Turquoise */
[data-theme="vibrant"] {
    /* Primary colors - Coral Glow */
    --md-sys-color-primary: #ff8360;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #ffd4c8;
    --md-sys-color-on-primary-container: #5c1a00;

    /* Surface colors */
    --md-sys-color-surface: #fffbf7;
    --md-sys-color-on-surface: #1f1b16;
    --md-sys-color-surface-variant: #f5ede4;
    --md-sys-color-on-surface-variant: #4f4539;

    /* Background */
    --md-sys-color-background: #fffbf7;
    --md-sys-color-on-background: #1f1b16;

    /* Secondary - Light Gold */
    --md-sys-color-secondary: #c4b84a;
    --md-sys-color-on-secondary: #2e2d00;
    --md-sys-color-secondary-container: #f5f0bb;
    --md-sys-color-on-secondary-container: #3d3b00;

    /* Tertiary - Turquoise */
    --md-sys-color-tertiary: #3cdbd3;
    --md-sys-color-on-tertiary: #003735;
    --md-sys-color-tertiary-container: #b8f5f1;
    --md-sys-color-on-tertiary-container: #002120;

    /* Error */
    --md-sys-color-error: #ff5449;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #ffdad6;
    --md-sys-color-on-error-container: #410002;

    /* Outline */
    --md-sys-color-outline: #7f7667;
    --md-sys-color-outline-variant: #d3c4b4;

    /* Success - Moss Green */
    --md-sys-color-success: #7dce82;
    --md-sys-color-on-success: #FFFFFF;
}

:root {
    /* Elevation */
    --md-sys-elevation-level0: none;
    --md-sys-elevation-level1: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-level2: 0px 1px 2px rgba(0, 0, 0, 0.3), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-level3: 0px 1px 3px rgba(0, 0, 0, 0.3), 0px 4px 8px 3px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-level4: 0px 2px 3px rgba(0, 0, 0, 0.3), 0px 6px 10px 4px rgba(0, 0, 0, 0.15);
    --md-sys-elevation-level5: 0px 4px 4px rgba(0, 0, 0, 0.3), 0px 8px 12px 6px rgba(0, 0, 0, 0.15);
}

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

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--md-sys-color-background);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--md-sys-color-on-background);
}

/* Accessibility Utilities */

/* Skip Link - Hidden until focused */
.skip-link {
    position: absolute;
    top: -40px;
    left: 0;
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    padding: 8px 16px;
    text-decoration: none;
    border-radius: 0 0 var(--md-sys-shape-corner-small) 0;
    font-weight: var(--md-sys-typescale-label-large-weight);
    z-index: 100;
    transition: top 0.2s;
}

.skip-link:focus {
    top: 0;
    outline: 2px solid var(--md-sys-color-on-primary);
    outline-offset: 2px;
}

/* Visually Hidden - Screen reader only content */
.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border-width: 0;
}

/* Enhanced Focus Indicators - Material Design 3 Pattern */
button:focus-visible,
input:focus-visible,
a:focus-visible {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
}

/* High Contrast Mode Support */
@media (prefers-contrast: high) {

    button,
    input,
    .result-item {
        border: 2px solid currentColor;
    }
}

.container {
    background: var(--md-sys-color-surface);
    border-radius: var(--md-sys-shape-corner-extra-large);
    box-shadow: var(--md-sys-elevation-level1);
    padding: 40px;
    max-width: 600px;
    width: 100%;
    transition: box-shadow 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Header Controls */
.header-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    margin-bottom: 24px;
    flex-wrap: wrap;
}

/* Theme Switcher */
.theme-switcher {
    display: flex;
    gap: 8px;
}

.theme-btn {
    position: relative;
    background: transparent;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface-variant);
    border-radius: var(--md-sys-shape-corner-large);
    padding: 6px 16px;
    cursor: pointer;
    font-size: var(--md-sys-typescale-label-medium-size);
    font-weight: var(--md-sys-typescale-label-medium-weight);
    font-family: 'Roboto', sans-serif;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

.theme-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-sys-color-primary);
    opacity: 0;
    transition: opacity 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.theme-btn:hover::before {
    opacity: 0.08;
}

.theme-btn:focus::before,
.theme-btn:active::before {
    opacity: 0.12;
}

.theme-btn.active {
    background: var(--md-sys-color-primary-container);
    border-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary-container);
}

.theme-btn span {
    position: relative;
    z-index: 1;
}

/* Language Switcher */
.language-switcher {
    display: flex;
    gap: 8px;
}

.lang-btn {
    position: relative;
    background: transparent;
    border: 1px solid var(--md-sys-color-outline);
    color: var(--md-sys-color-on-surface-variant);
    border-radius: var(--md-sys-shape-corner-large);
    padding: 6px 16px;
    cursor: pointer;
    font-size: var(--md-sys-typescale-label-medium-size);
    font-weight: var(--md-sys-typescale-label-medium-weight);
    font-family: 'Roboto', sans-serif;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* State Layer for Language Button */
.lang-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-sys-color-primary);
    opacity: 0;
    transition: opacity 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.lang-btn:hover::before {
    opacity: 0.08;
}

.lang-btn:focus::before,
.lang-btn:active::before {
    opacity: 0.12;
}

.lang-btn.active {
    background: var(--md-sys-color-primary-container);
    border-color: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary-container);
}

.lang-btn span {
    position: relative;
    z-index: 1;
}

/* Typography */
h1 {
    color: var(--md-sys-color-on-surface);
    margin-bottom: 8px;
    font-size: var(--md-sys-typescale-headline-large-size);
    font-weight: var(--md-sys-typescale-headline-large-weight);
    line-height: var(--md-sys-typescale-headline-large-line-height);
    display: flex;
    align-items: center;
    gap: 12px;
}

h1 .material-icons {
    font-size: 32px;
    color: var(--md-sys-color-primary);
}

.subtitle {
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 32px;
    font-size: var(--md-sys-typescale-body-medium-size);
    font-weight: var(--md-sys-typescale-body-medium-weight);
    line-height: var(--md-sys-typescale-body-medium-line-height);
}

/* Input Group */
.input-group {
    margin-bottom: 24px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: var(--md-sys-typescale-body-medium-size);
    font-weight: var(--md-sys-typescale-body-medium-weight);
}

/* MD3 Filled Text Field */
input[type="text"] {
    width: 100%;
    padding: 16px;
    background: var(--md-sys-color-surface-variant);
    border: none;
    border-bottom: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-sys-shape-corner-extra-small) var(--md-sys-shape-corner-extra-small) 0 0;
    font-size: var(--md-sys-typescale-body-large-size);
    color: var(--md-sys-color-on-surface);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    font-family: 'Roboto', sans-serif;
}

input[type="text"]:focus {
    outline: none;
    border-bottom: 2px solid var(--md-sys-color-primary);
    background: var(--md-sys-color-surface-variant);
}

input[type="text"]::placeholder {
    color: var(--md-sys-color-on-surface-variant);
    opacity: 0.6;
}

/* Results Section */
.results {
    display: none;
}

.results.show {
    display: block;
}

/* MD3 Elevated Card */
.result-item {
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-medium);
    padding: 16px;
    margin-bottom: 12px;
    box-shadow: var(--md-sys-elevation-level1);
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    animation: fadeIn 0.3s ease;
}

.result-item:hover {
    box-shadow: var(--md-sys-elevation-level2);
}

.result-label {
    color: var(--md-sys-color-primary);
    font-weight: var(--md-sys-typescale-label-medium-weight);
    font-size: var(--md-sys-typescale-label-medium-size);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 8px;
}

.result-content {
    display: flex;
    align-items: center;
    gap: 12px;
}

.result-value {
    flex: 1;
    font-family: 'Roboto Mono', 'Courier New', monospace;
    font-size: var(--md-sys-typescale-body-large-size);
    color: var(--md-sys-color-on-surface);
    word-break: break-all;
}

/* MD3 Filled Button */
.copy-btn {
    position: relative;
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    border-radius: var(--md-sys-shape-corner-large);
    padding: 10px 24px;
    cursor: pointer;
    font-size: var(--md-sys-typescale-label-large-size);
    font-weight: var(--md-sys-typescale-label-large-weight);
    font-family: 'Roboto', sans-serif;
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    white-space: nowrap;
    overflow: hidden;
    box-shadow: var(--md-sys-elevation-level1);
}

/* State Layer for Buttons */
.copy-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-sys-color-on-primary);
    opacity: 0;
    transition: opacity 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.copy-btn:hover::before {
    opacity: 0.08;
}

.copy-btn:focus::before,
.copy-btn:active::before {
    opacity: 0.12;
}

.copy-btn:hover {
    box-shadow: var(--md-sys-elevation-level2);
}

.copy-btn:active {
    box-shadow: var(--md-sys-elevation-level1);
}

.copy-btn.copied {
    background: var(--md-sys-color-success);
    color: var(--md-sys-color-on-success);
    animation: copySuccess 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Advanced Toggle Section */
.advanced-toggle {
    margin-top: 20px;
    padding: 16px 0;
    border-top: 1px solid var(--md-sys-color-outline-variant);
}

/* MD3 Text Button */
.toggle-btn {
    position: relative;
    background: transparent;
    border: none;
    color: var(--md-sys-color-primary);
    font-weight: var(--md-sys-typescale-label-large-weight);
    font-size: var(--md-sys-typescale-label-large-size);
    font-family: 'Roboto', sans-serif;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 12px;
    border-radius: var(--md-sys-shape-corner-large);
    transition: all 0.28s cubic-bezier(0.4, 0, 0.2, 1);
    overflow: hidden;
}

/* State Layer for Text Button */
.toggle-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--md-sys-color-primary);
    opacity: 0;
    transition: opacity 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

.toggle-btn:hover::before {
    opacity: 0.08;
}

.toggle-btn:focus::before,
.toggle-btn:active::before {
    opacity: 0.12;
}

.toggle-icon {
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    display: inline-flex;
    align-items: center;
    font-size: 18px;
}

.toggle-icon.expanded {
    transform: rotate(90deg);
}

.toggle-btn span {
    position: relative;
    z-index: 1;
}

/* Advanced Options */
.advanced-options {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}

.advanced-options.show {
    max-height: 1000px;
    transition: max-height 0.5s ease-in;
}

/* Error Message */
.error {
    background: var(--md-sys-color-error-container);
    border: 1px solid var(--md-sys-color-error);
    color: var(--md-sys-color-on-error-container);
    padding: 12px 16px;
    border-radius: var(--md-sys-shape-corner-small);
    margin-bottom: 16px;
    display: none;
    font-size: var(--md-sys-typescale-body-medium-size);
}

.error.show {
    display: block;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(8px);
    }

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

@keyframes copySuccess {
    0% {
        transform: scale(1);
    }

    50% {
        transform: scale(1.05);
    }

    100% {
        transform: scale(1);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 24px;
    }

    h1 {
        font-size: 28px;
    }

    .result-content {
        flex-direction: column;
        align-items: stretch;
    }

    .copy-btn {
        width: 100%;
    }
}