:root {
    --primary: #2563eb;
    --primary-hover: #1d4ed8;
    --error: #dc2626;
    --background: #ffffff;
    --surface: #ffffff;
    --text-primary: #111827;
    --text-secondary: #6b7280;
    --text-link: #2f5bb9;
    --border: #e5e7eb;
    --border-hover: #d1d5db;
    --radius: 8px;
    --radius-sm: 6px;
    --spacing: 1.5rem;
    --transition: all 0.2s ease;
}

[data-theme="dark"] {
    --primary: #3b82f6;
    --primary-hover: #2563eb;
    --error: #ef4444;
    --background: #1a1a1a;
    --surface: #2d2d2d;
    --text-primary: #f5f5f5;
    --text-secondary: #a0a0a0;
    --text-link: #5893e4;
    --border: #404040;
    --border-hover: #555555;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) {
        --primary: #3b82f6;
        --primary-hover: #2563eb;
        --error: #ef4444;
        --background: #1a1a1a;
        --surface: #2d2d2d;
        --text-primary: #f5f5f5;
        --text-secondary: #a0a0a0;
        --text-link: #5893e4;
        --border: #404040;
        --border-hover: #555555;
    }
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'IBM Plex Sans', sans-serif;
    background: var(--background);
    color: var(--text-primary);
    line-height: 1.6;
    padding: var(--spacing) var(--spacing) 0 var(--spacing);
}

.container {
    max-width: 600px;
    margin: 0 auto;
    background: var(--surface);
    border-radius: var(--radius);
    border: 1px solid var(--border);
    overflow: hidden;
}

header {
    background: var(--surface);
    color: var(--text-primary);
    padding: calc(var(--spacing) * 1);
    border-bottom: 1px solid var(--border);
}

h1, h2, h3, h4, h5, h6, button, kbd, samp {
    font-family: 'IBM Plex Mono', sans-serif;
}

a {
    color: var(--text-link);
    text-decoration: none;
}

a:active, a:hover {
    text-decoration: underline;
}

a:visited {
    color: var(--text-link);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 1rem;
}

.header-content > div {
    flex: 1;
    text-align: center;
}

header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0;
    color: var(--text-primary);
}

th {
    text-align: left;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.instructions-toggle h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0;
    color: var(--text-primary);
}

h4.instruction-title {
    font-size: .85rem;
    font-weight: 600;
    margin-top: 0;
    margin-bottom: 0;
    color: var(--text-primary);
}

.theme-toggle {
    background: transparent;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    flex-shrink: 0;
}

.theme-toggle:hover {
    border-color: var(--border-hover);
    background: var(--background);
}

.theme-icon {
    font-size: 1.25rem;
    line-height: .7;
    transition: transform 0.2s ease;
    color: var(--text-primary);
}

.theme-toggle:hover .theme-icon {
    transform: scale(1.1);
}

.subtitle {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 400;
    margin: 0;
}

main {
    padding: var(--spacing);
}

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

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.form-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.input {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: .85rem;
    font-family: 'IBM Plex Mono', monospace;
    transition: var(--transition);
    background: var(--surface);
    color: var(--text-primary);
}

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

.input::placeholder {
    color: var(--text-secondary);
}

.radio-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.radio-label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    padding: 0.625rem 1rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: var(--transition);
    background: var(--surface);
    font-weight: 400;
    user-select: none;
}

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

.radio-label input[type="radio"] {
    width: 16px;
    height: 16px;
    cursor: pointer;
    accent-color: var(--primary);
}

.radio-label input[type="radio"]:checked + span {
    color: var(--text-primary);
    font-weight: 500;
}

.radio-label:has(input[type="radio"]:checked) {
    border-color: var(--primary);
    background: var(--surface);
}

.btn-generate {
    width: 100%;
    padding: 0.875rem;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: .85rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 0.5rem;
}

.btn-generate:hover {
    background: var(--primary-hover);
}

.btn-generate:active {
    opacity: 0.9;
}

.btn-generate:focus-visible,
.input:focus-visible,
.instructions-toggle:focus-visible,
.radio-label:focus-visible {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.result-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.result-group label {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
}

.password-display {
    padding: 1.25rem;
    background: var(--surface);
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    text-align: center;
    min-height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.password-text {
    font-size: 1.5rem;
    font-weight: 600;
    font-family: 'IBM Plex Mono', monospace;
    color: var(--text-primary);
    letter-spacing: 2px;
}

.instructions-section {
    margin-top: calc(var(--spacing) * 1.5);
    border-top: 1px solid var(--border);
    padding-top: var(--spacing);
}

.instructions-toggle {
    width: 100%;
    padding: 0.875rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 500;
    color: var(--text-primary);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: var(--transition);
}

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

.toggle-icon {
    transition: transform 0.2s ease;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.instructions-toggle[aria-expanded="true"] .toggle-icon {
    transform: rotate(180deg);
}

.instructions-content {
    display: none;
    margin-top: var(--spacing);
    gap: var(--spacing);
}

.instructions-content[style*="block"] {
    display: grid;
}

.instruction-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    padding: 1rem;
    transition: var(--transition);
}

.instruction-title {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.75rem;
    margin-top: 0;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

.instruction-duo ul {
    list-style-type: none;
    padding-left: 1em;
}

.instruction-duo {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: calc(var(--spacing) * 0.5);
}

.instruction-note {
    margin: 0;
    color: var(--text-secondary);
    font-size: 0.9375rem;
    font-style: italic;
}

.instruction-card li {
    position: relative;
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.instruction-card p {
    color: var(--text-secondary);
    margin-top: 0.5rem;
    font-size: 0.9375rem;
}

.special-chars {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 0.75rem;
}

.char-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}

.char-value {
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--text-primary);
    font-family: 'IBM Plex Mono', monospace;
    padding: 0.25rem 0.5rem;
    background: var(--surface);
    border-radius: 4px;
    border: 1px solid var(--border);
}

.char-table {
    border-collapse: collapse;
}

.char-table td,
.char-table th {
    text-align: center;
    padding: 0.3rem;
}

.char-table td .char-value {
    display: inline-block;
}

.trainer-card-image {
    text-align: center;
    margin-bottom: .5rem;
}

table.trainer-card-info {
    border-collapse: separate; /* Required for border-spacing */
    border-spacing: 10px;
}

.trainer-card-info-information {
    color: var(--text-secondary);
    font-size: 0.9375rem;
}

.trainer-card-info-field {
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.875rem;
    padding: 0.25rem 0.5rem;
    background: var(--surface);
    border-radius: 4px;
    border: 1px solid var(--border);
}

kbd, samp {
    background: var(--text-secondary);
    color: var(--background);
    padding: 0.05rem 0.2rem;
    border-radius: 4px;
    border: 1px solid var(--border);
    font-size: 0.875rem;
    font-weight: 600;
    font-family: 'IBM Plex Mono', monospace;
    letter-spacing: 1px;
    text-transform: uppercase;
}

.footer-text {
    text-align: center;
    font-size: 0.75rem;
    font-weight: 500;
    font-family: 'IBM Plex Mono', monospace;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-top: calc(var(--spacing) * 1.5);
    margin-bottom: 0;
}

.source-link {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    text-decoration: none;
    font-family: 'IBM Plex Mono', monospace;
}

/* Error states */
.input[style*="background-color: rgb(215, 119, 119)"] {
    border-color: var(--error) !important;
    background-color: rgba(220, 38, 38, 0.1) !important;
}

[data-theme="dark"] .input[style*="background-color: rgb(215, 119, 119)"] {
    background-color: rgba(239, 68, 68, 0.15) !important;
}

@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .input[style*="background-color: rgb(215, 119, 119)"] {
        background-color: rgba(239, 68, 68, 0.15) !important;
    }
}

/* Responsive design */
@media (max-width: 640px) {
    body {
        padding: 0.75rem;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .subtitle {
        font-size: 0.85rem;
    }

    main {
        padding: 1rem;
    }

    .password-text {
        font-size: 1.25rem;
    }

    .radio-group {
        flex-direction: column;
    }

    .radio-label {
        width: 100%;
    }

    .instruction-duo {
        display: flex;
        flex-direction: column;
        gap: calc(var(--spacing) * 0.5);
    }
}

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

.instructions-content {
    animation: fadeIn 0.2s ease;
}

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