:root {
    /* Light mode variables */
    --bg-primary: #f6f6f6;
    --bg-secondary: #ffffff;
    --text-primary: #212529;
    --text-secondary: #1a1a1a;
    --text-footer: #6c757d;
    --link-color: #0a58ca;
    --link-color-hover: #084298;
    --border-color: #e1e5e9;
    --accent-color: #0b5ed7;
    --accent-hover: #084298;
    --button-text: #ffffff;
    --success-color: #28a745;
    --error-color: #dc3545;
    --warning-color: #ffc107;
    --card-bg: #ffffff;
    --input-bg: #ffffff;
    --output-bg: #e6e6e6;
}

[data-theme="dark"] {
    /* Dark mode variables */
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --text-primary: #ffffff;
    --text-secondary: #b0b0b0;
    --text-footer: #b0b0b0;
    --link-color: #74c0fc;
    --link-color-hover: #a5d8ff;
    --border-color: #404040;
    --accent-color: #4dabf7;
    --accent-hover: #74c0fc;
    --button-text: #1a1a1a;
    --success-color: #51cf66;
    --error-color: #ff6b6b;
    --warning-color: #ffd43b;
    --card-bg: #2d2d2d;
    --input-bg: #404040;
    --output-bg: #161616;
}

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

::-moz-selection {
    color: #fff;
    background: #8db9ff;
    background-image: none;
    -webkit-text-fill-color: #fff;
}
::selection {
    color: #fff;
    background: #8db9ff;
    background-image: none;
    -webkit-text-fill-color: #fff;
}

@font-face {
    font-family: FragmentMono;
    src: url("../../assets/fonts/FragmentMono-Regular.woff2") format("woff2"),
        url("../../assets/fonts/FragmentMono-Regular.woff") format("woff"),
        url("../../assets/fonts/FragmentMono-Regular.otf") format("otf");
}

@font-face {
    font-family: CourierPrime;
    src: url("../../assets/fonts/CourierPrime-Regular.woff2") format("woff2"),
        url("../../assets/fonts/CourierPrime-Regular.woff") format("woff"),
        url("../../assets/fonts/CourierPrime-Regular.ttf") format("ttf");
}

body {
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    font-family: FragmentMono, 'Open Sans', sans-serif;
    max-width: 850px;
    margin: 0 auto;
    padding: 0 20px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Header */
header {
    border-bottom: 1px solid var(--border-color);
    margin: 0 -20px 2rem -20px;
    padding: 2rem 20px 1rem 20px;
}

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

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
}

/* Theme Toggle */
.theme-toggle {
    display: flex;
    align-items: center;
}

.theme-icon {
    width: 32px;
    height: 32px;
    padding: 3px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--card-bg);
    cursor: pointer;
    transition: opacity 120ms ease;
    opacity: 0.8;
}

.theme-icon img {
    display: block;
    width: 24px;
    height: 24px;
}

.theme-icon:hover {
    opacity: 1;
}

.sun-icon {
    display: none;
}

.moon-icon {
    display: block;
}

[data-theme="dark"] .sun-icon {
    display: block;
}

[data-theme="dark"] .moon-icon {
    display: none;
}

/* Main Content */
main {
    flex: 1;
}
 
.content {
    margin-bottom: 3rem;
}

a, a:visited {
    color: var(--link-color) !important;
    text-decoration: none;
}
a:hover, a:visited:hover {
    color: var(--link-color-hover) !important;
    text-decoration: underline;
    text-decoration-thickness: 2px;
    text-underline-offset: 4px;
}

h1 {
    font-size: 2.5rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}
h2 {
    font-size: 1.5rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}
h3 {
    font-size: 1.3rem;
    margin-top: 1rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

p {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* Input Section */
.input-section {
    margin: 2rem 0;
}

.input-section label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

#emailInput {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
    transition: border-color 120ms ease;
}

#emailInput:focus {
    border-color: var(--accent-color);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
    outline: 2px solid var(--accent-color);
    outline-offset: 3px;
}

.toggle-switch input:focus-visible + .toggle-slider {
    outline: 2px solid var(--accent-color);
    outline-offset: 3px;
}

#emailInput::placeholder {
    color: var(--text-secondary);
}

/* Options Section */
.options-section {
    margin: 2rem 0;
    padding: 1.5rem;
    background-color: var(--card-bg);
    border-radius: 4px;
    border: 1px solid var(--border-color);
}

.option-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.option-item:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* Toggle Switches */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
    margin-top: 0.25rem;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--border-color);
    border-radius: 24px;
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    border-radius: 50%;
}

.toggle-switch input:checked + .toggle-slider {
    background-color: var(--accent-color);
}

.toggle-switch input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

.option-text {
    flex: 1;
}

.option-title {
    display: block;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.25rem;
    font-size: 0.95rem;
}

.option-description {
    display: block;
    color: var(--text-secondary);
    font-size: 0.75rem;
    line-height: 1.4;
}

/* Action Section */
.action-section {
    margin: 2rem 0;
    text-align: center;
}

.process-btn {
    background-color: var(--accent-color);
    color: var(--button-text);
    border: 1px solid var(--accent-color);
    padding: 0.75rem 1.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 120ms ease, border-color 120ms ease;
}

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

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

.process-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

/* Progress Bar */
.progress-container {
    margin-top: 1rem;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background-color: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    background-color: var(--accent-color);
    width: 0%;
}

.progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Results Section */
.results-section {
    margin-top: 2rem;
}

.result-group {
    margin-bottom: 2rem;
}

.result-group h3 {
    margin-bottom: 0.75rem;
    font-size: 1.1rem;
}

textarea {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background-color: var(--input-bg) !important;
    color: var(--text-primary);
    font-family: CourierPrime, 'Courier New', Courier, monospace !important;
    font-size: 0.9rem;
    line-height: 1.5;
    resize: vertical;
}

#emailInput {
    background-color: var(--input-bg) !important;
}

#validEmails, #invalidEmails, #logBox {
    background-color: var(--output-bg) !important;
}


/* Footer */
footer {
    margin-top: auto;
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

footer p {
    color: var(--text-footer);
    font-size: 0.8rem;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }

    .header-content {
        flex-direction: column;
        gap: 1rem;
        align-items: flex-start;
    }

    h1 {
        font-size: 2rem;
    }

    .option-item {
        flex-direction: column;
        gap: 0.75rem;
    }

    .toggle-switch {
        align-self: flex-start;
    }

    .process-btn {
        width: 100%;
        padding: 0.75rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 10px;
    }

    h1 {
        font-size: 1.75rem;
    }

    .options-section {
        padding: 1rem;
    }

    #emailInput {
        min-height: 120px;
    }
}

.result-chart {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-bottom: 20px;
    background: var(--card-bg);
    padding: 20px;
}
.result-chart canvas {
    max-width: 300px !important;
    max-height: 320px !important;
    width: 100% !important;
    height: auto !important;
    background: var(--card-bg);
}