:root {
    --brand-green: #00703c;
    --brand-green-dark: #005a30;
    --brand-green-darker: #003d20;
    --brand-green-light: #e8f5ee;
    --brand-green-pale: #f3faf6;
    --black: #1a1a1a;
    --white: #ffffff;
    --light-grey: #f5f5f5;
    --mid-grey: #b1b4b6;
    --dark-grey: #505a5f;
    --border-grey: #d9d9d9;
    --red: #d4351c;
    --orange: #f47738;
    --focus: #fd0;
    --link: #00703c;
    --link-hover: #005a30;
    --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

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

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-stack);
    color: var(--black);
    background: var(--white);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

a {
    color: var(--link);
    text-decoration-thickness: 1px;
    text-underline-offset: 0.15em;
}

a:hover {
    color: var(--link-hover);
    text-decoration-thickness: 2px;
}

a:focus {
    outline: 3px solid var(--focus);
    outline-offset: 0;
    background: var(--focus);
    color: var(--black);
    text-decoration: none;
}

/* Header */
.site-header {
    background: var(--brand-green);
    color: var(--white);
}

.site-header__container {
    max-width: 960px;
    margin: 0 auto;
    padding: 14px 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.site-header__logo {
    height: 36px;
    width: auto;
    flex-shrink: 0;
    border: 2px solid var(--white);
    border-radius: 2px;
}

.site-header__title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--white);
    text-decoration: none;
    letter-spacing: -0.01em;
}

.site-header__title:hover {
    text-decoration: underline;
    text-decoration-thickness: 3px;
    text-underline-offset: 0.15em;
    color: var(--white);
}

.site-header__title:focus {
    outline: 3px solid var(--focus);
    background: var(--focus);
    color: var(--black);
}

/* Navigation tabs */
.site-tabs {
    max-width: 960px;
    margin: 0 auto;
    padding: 0 20px;
    width: 100%;
}

.site-tabs__list {
    list-style: none;
    display: flex;
    border-bottom: 2px solid var(--brand-green);
    margin: 0;
    padding: 0;
    gap: 0;
}

.site-tabs__tab {
    padding: 12px 20px;
    font-size: 1rem;
    font-weight: 400;
    color: var(--brand-green);
    text-decoration: none;
    border: 1px solid transparent;
    border-bottom: none;
    cursor: pointer;
    position: relative;
    top: 2px;
    background: none;
    font-family: var(--font-stack);
    transition: background 0.15s ease;
}

.site-tabs__tab:hover {
    color: var(--brand-green-dark);
    background: var(--brand-green-pale);
}

.site-tabs__tab:focus {
    outline: 3px solid var(--focus);
    outline-offset: 0;
    background: var(--focus);
    color: var(--black);
}

.site-tabs__tab--active {
    color: var(--black);
    background: var(--white);
    border-color: var(--brand-green);
    border-bottom-color: var(--white);
    font-weight: 700;
}

.site-tabs__panel {
    display: none;
    padding: 30px 0;
}

.site-tabs__panel--active {
    display: block;
}

/* Main content */
.site-main {
    flex: 1;
    padding: 20px 20px 40px;
}

.site-container {
    max-width: 960px;
    margin: 0 auto;
}

/* Typography */
h1 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 20px;
    line-height: 1.15;
    color: var(--brand-green-darker);
}

h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
    line-height: 1.2;
    color: var(--brand-green-darker);
}

h3 {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 10px;
}

p {
    margin-bottom: 15px;
}

/* Form elements */
.form-textarea {
    width: 100%;
    min-height: 150px;
    padding: 10px;
    font-family: var(--font-stack);
    font-size: 1rem;
    line-height: 1.5;
    border: 2px solid var(--dark-grey);
    border-radius: 4px;
    resize: vertical;
    color: var(--black);
    transition: border-color 0.15s ease;
}

.form-textarea:focus {
    outline: 3px solid var(--focus);
    outline-offset: 0;
    border-color: var(--black);
}

.form-textarea::placeholder {
    color: var(--dark-grey);
}

.form-label {
    display: block;
    font-size: 1rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.form-hint {
    color: var(--dark-grey);
    font-size: 0.9375rem;
    margin-bottom: 10px;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 10px 20px 9px;
    font-family: var(--font-stack);
    font-size: 1rem;
    font-weight: 700;
    line-height: 1.2;
    color: var(--white);
    background: var(--brand-green);
    border: none;
    border-bottom: 3px solid var(--brand-green-darker);
    border-radius: 4px;
    cursor: pointer;
    text-decoration: none;
    -webkit-appearance: none;
    appearance: none;
    transition: background 0.15s ease;
}

.btn:hover {
    background: var(--brand-green-dark);
}

.btn:focus {
    outline: 3px solid var(--focus);
    outline-offset: 0;
}

.btn:active {
    border-bottom-width: 0;
    padding-bottom: 12px;
}

.btn--secondary {
    background: var(--light-grey);
    color: var(--black);
    border-bottom-color: var(--mid-grey);
}

.btn--secondary:hover {
    background: #e5e5e5;
}

.btn--warning {
    background: var(--red);
    border-bottom-color: #7d1e10;
}

.btn--warning:hover {
    background: #aa2a16;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-group {
    display: flex;
    gap: 10px;
    align-items: center;
    flex-wrap: wrap;
    margin-top: 15px;
    margin-bottom: 20px;
}

/* Checkbox */
.checkbox-item {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 10px;
}

.checkbox-input {
    width: 36px;
    height: 36px;
    flex-shrink: 0;
    cursor: pointer;
    accent-color: var(--brand-green);
}

.checkbox-label {
    font-size: 1rem;
    cursor: pointer;
}

/* Text input */
.form-input {
    width: 100%;
    padding: 10px;
    font-family: var(--font-stack);
    font-size: 1rem;
    border: 2px solid var(--dark-grey);
    border-radius: 4px;
    color: var(--black);
    transition: border-color 0.15s ease;
}

.form-input:focus {
    outline: 3px solid var(--focus);
    outline-offset: 0;
    border-color: var(--black);
}

/* Summary bar */
.summary-bar {
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    padding: 14px 16px;
    background: var(--brand-green-light);
    border-left: 5px solid var(--brand-green);
    border-radius: 0 4px 4px 0;
    margin-bottom: 24px;
}

.summary-bar__item {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9375rem;
    font-weight: 700;
}

.summary-bar__item--error {
    color: var(--red);
}

.summary-bar__item--warning {
    color: #b45309;
}

.summary-bar__item--total {
    color: var(--dark-grey);
    font-weight: 400;
    margin-left: auto;
}

/* Results */
.results-group {
    margin-bottom: 28px;
}

.results-group__heading {
    font-size: 1.125rem;
    font-weight: 700;
    padding: 10px 0;
    border-bottom: 3px solid var(--brand-green);
    margin-bottom: 0;
    display: flex;
    align-items: center;
    gap: 8px;
    color: var(--brand-green-darker);
}

.results-group__heading .category-icon {
    font-size: 1.125rem;
}

.result-item {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-grey);
}

.result-item:last-child {
    border-bottom: none;
}

.result-item__header {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    margin-bottom: 4px;
}

.result-item__icon {
    flex-shrink: 0;
    font-size: 1.25rem;
    line-height: 1;
    margin-top: 2px;
}

.result-item__icon--error {
    color: var(--red);
}

.result-item__icon--warning {
    color: var(--orange);
}

.result-item__match {
    font-weight: 700;
    font-size: 0.9375rem;
}

.result-item__match--error {
    color: var(--red);
}

.result-item__match--warning {
    color: #b45309;
}

.result-item__message {
    font-size: 0.9375rem;
    margin: 4px 0 4px 34px;
}

.result-item__suggestion {
    font-size: 0.875rem;
    color: var(--dark-grey);
    margin: 2px 0 4px 34px;
}

.result-item__location {
    font-size: 0.75rem;
    color: var(--mid-grey);
    margin-left: 34px;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--dark-grey);
}

.empty-state__icon {
    font-size: 3rem;
    margin-bottom: 15px;
    opacity: 0.5;
}

.empty-state__heading {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--black);
}

.empty-state__text {
    font-size: 1rem;
    max-width: 420px;
    margin: 0 auto;
}

/* Style guide */
.letter-nav {
    display: flex;
    flex-wrap: wrap;
    gap: 4px;
    margin-bottom: 20px;
    padding: 10px;
    background: var(--brand-green-light);
    border-radius: 4px;
}

.letter-nav__link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    font-size: 0.9375rem;
    font-weight: 700;
    text-decoration: none;
    color: var(--brand-green);
    border-radius: 3px;
    transition: background 0.15s ease;
}

.letter-nav__link:hover {
    background: var(--white);
}

.letter-nav__link:focus {
    outline: 3px solid var(--focus);
    background: var(--focus);
    color: var(--black);
}

.letter-nav__link--disabled {
    color: var(--mid-grey);
    pointer-events: none;
}

.letter-nav__link--active {
    background: var(--brand-green);
    color: var(--white);
}

.styleguide-search {
    margin-bottom: 20px;
}

.search-field {
    position: relative;
}

.search-field .form-input {
    padding-right: 40px;
}

.search-field__clear {
    position: absolute;
    right: 4px;
    top: 50%;
    transform: translateY(-50%);
    width: 32px;
    height: 32px;
    border: none;
    background: none;
    font-size: 1.25rem;
    color: var(--dark-grey);
    cursor: pointer;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-family: var(--font-stack);
}

.search-field__clear:hover {
    color: var(--black);
    background: var(--light-grey);
}

.search-field__clear:focus {
    outline: 3px solid var(--focus);
}

.styleguide-entry {
    padding: 15px 0;
    border-bottom: 1px solid var(--border-grey);
}

.styleguide-entry__term {
    font-size: 1.125rem;
    font-weight: 700;
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.styleguide-entry__body {
    font-size: 0.9375rem;
    line-height: 1.6;
    white-space: pre-line;
}

.styleguide-entry__body b,
.styleguide-entry__body strong {
    font-weight: 700;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: 3px;
}

.badge--govuk {
    background: var(--brand-green);
    color: var(--white);
}

.badge--dept {
    background: #912b88;
    color: var(--white);
}

.letter-section {
    margin-bottom: 30px;
}

.letter-section__heading {
    font-size: 1.5rem;
    font-weight: 700;
    padding: 10px 0 5px;
    border-bottom: 3px solid var(--brand-green);
    margin-bottom: 5px;
    color: var(--brand-green-darker);
}

/* Settings & privacy */
.settings-section {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-grey);
}

.settings-section:last-child {
    border-bottom: none;
}

.privacy-section {
    padding: 20px 0;
    border-bottom: 1px solid var(--border-grey);
}

.privacy-section:last-child {
    border-bottom: none;
}

.privacy-section h3 {
    color: var(--brand-green-darker);
    margin-top: 10px;
}

.privacy-section p,
.privacy-section ul {
    margin-bottom: 12px;
}

.privacy-section ul {
    margin-left: 20px;
}

.privacy-section li {
    margin-bottom: 6px;
}

/* Footer */
.site-footer {
    background: var(--brand-green-pale);
    border-top: 3px solid var(--brand-green);
    padding: 24px 20px;
    margin-top: auto;
}

.site-footer__container {
    max-width: 960px;
    margin: 0 auto;
    display: flex;
    flex-wrap: wrap;
    gap: 10px 30px;
    align-items: baseline;
}

.site-footer__text {
    font-size: 0.875rem;
    color: var(--dark-grey);
}

.site-footer__link {
    color: var(--brand-green);
    font-size: 0.875rem;
}

.site-footer__link:hover {
    color: var(--brand-green-dark);
}

.site-footer__separator {
    color: var(--mid-grey);
}

/* Loading */
.loading-spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid var(--brand-green-light);
    border-top-color: var(--brand-green);
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-right: 8px;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Utility */
.visually-hidden {
    position: absolute !important;
    width: 1px !important;
    height: 1px !important;
    margin: 0 !important;
    padding: 0 !important;
    overflow: hidden !important;
    clip: rect(0 0 0 0) !important;
    -webkit-clip-path: inset(50%) !important;
    clip-path: inset(50%) !important;
    border: 0 !important;
    white-space: nowrap !important;
}

/* Responsive */
@media (max-width: 640px) {
    h1 { font-size: 1.5rem; }
    h2 { font-size: 1.25rem; }

    .site-header__container {
        padding: 12px 15px;
    }

    .site-tabs__list {
        flex-direction: column;
        border-bottom: none;
    }

    .site-tabs__tab {
        border: 1px solid var(--border-grey);
        border-bottom: none;
        top: 0;
    }

    .site-tabs__tab:last-child {
        border-bottom: 1px solid var(--border-grey);
    }

    .site-tabs__tab--active {
        border-left: 4px solid var(--brand-green);
        background: var(--brand-green-pale);
    }

    .summary-bar {
        gap: 10px;
    }

    .summary-bar__item--total {
        margin-left: 0;
    }

    .letter-nav__link {
        width: 28px;
        height: 28px;
        font-size: 0.8125rem;
    }

    .site-footer__container {
        flex-direction: column;
        gap: 8px;
    }
}