/*
 * Base document
 */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html {
    font-family: var(--font-family-sans);
    font-size: 100%;
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    background: var(--color-background);
    color: var(--color-text);
}

body {
    min-width: 320px;
    margin: 0;
    background: var(--color-background);
    color: var(--color-text);
    transition:
        background-color 180ms ease,
        color 180ms ease;
}

button,
input {
    font: inherit;
}

button,
input[type="checkbox"],
input[type="radio"] {
    cursor: pointer;
}

button:disabled {
    cursor: not-allowed;
}

a {
    color: inherit;
}

/*
 * Focus indicator
 *
 * Keep keyboard focus clearly visible without visually detaching
 * the indicator from the component.
 */

:focus-visible {
    outline: 2px solid var(--color-focus);
    outline-offset: 0;
}

/*
 * Typography utilities
 */

.text-display {
    margin: 0;
    font-size: var(--font-size-4xl);
    font-weight: var(--font-weight-light);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
}

.text-heading-1 {
    margin: 0;
    font-size: var(--font-size-3xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

.text-heading-2 {
    margin: 0;
    font-size: var(--font-size-2xl);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-tight);
}

.text-heading-3 {
    margin: 0;
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
}

.text-body {
    margin: 0;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
}

.text-body-small {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
}

.text-caption {
    margin: 0;
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
}

.text-label {
    margin: 0;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-normal);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

.text-muted {
    color: var(--color-text-muted);
}

.text-strong {
    font-weight: var(--font-weight-semibold);
}

/*
 * Demo layout
 */

.style-guide {
    width: min(1480px, calc(100% - 48px));
    margin-inline: auto;
    padding-block: 40px;
}

.style-guide__header {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 32px;
    padding-bottom: 40px;
    border-bottom: 1px solid var(--color-border);
}

.brand {
    display: inline-flex;
    align-items: center;
    gap: 24px;
    color: var(--color-text);
    text-decoration: none;
}

.brand__logo {
    display: block;
    width: auto;
    max-height: 96px;
}

.brand__name {
    font-size: clamp(1.4rem, 3vw, 2rem);
    font-weight: var(--font-weight-light);
    letter-spacing: 0.32em;
}

.brand__domain {
    margin-left: 0.15em;
    font-size: 0.6em;
    letter-spacing: 0.04em;
}

.theme-switcher {
    display: flex;
    align-items: center;
    gap: 14px;
}

.theme-switcher__label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

.demo-section {
    min-width: 0;
}

.demo-section__title {
    margin: 0 0 24px;
    color: var(--color-text);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    letter-spacing: var(--letter-spacing-wide);
    text-transform: uppercase;
}

.style-guide > .demo-section {
    padding-block: 32px;
    border-bottom: 1px solid var(--color-border);
}

.component-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--color-border);
}

.component-grid > .demo-section {
    padding: 32px;
}

.component-grid > .demo-section:first-child {
    padding-left: 0;
}

.component-grid > .demo-section:last-child {
    padding-right: 0;
}

.component-grid > .demo-section + .demo-section {
    border-left: 1px solid var(--color-border);
}

.content-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 48px;
    padding-block: 32px;
    border-bottom: 1px solid var(--color-border);
}

.component-grid--bottom {
    grid-template-columns: 2fr 1fr;
}

.stack {
    display: grid;
    gap: 14px;
}

.typography-samples {
    display: grid;
    gap: 20px;
}

.typography-sample {
    display: grid;
    grid-template-columns: minmax(120px, 180px) 1fr;
    gap: 24px;
    align-items: baseline;
}

.typography-sample__meta {
    color: var(--color-text-muted);
    font-family: var(--font-family-mono);
    font-size: 0.7rem;
}

/*
 * Theme switch
 */

.switch {
    position: relative;
    width: 46px;
    height: 26px;
    padding: 2px;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface-alt);
}

.switch__thumb {
    display: block;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--color-secondary);
    transform: translateX(0);
    transition:
        transform 180ms ease,
        background-color 180ms ease;
}

.switch[aria-checked="true"] .switch__thumb {
    transform: translateX(20px);
}

/*
 * Palette
 */

.palette {
    display: grid;
    grid-template-columns: repeat(8, minmax(90px, 1fr));
    gap: 16px;
}

.color-swatch {
    display: grid;
    gap: 7px;
    color: var(--color-text-muted);
    font-size: 0.76rem;
    text-align: center;
}

.color-swatch strong {
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
}

.color-swatch code {
    font-family: var(--font-family-mono);
    font-size: 0.7rem;
}

.color-swatch__sample {
    height: 58px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
}

.color-swatch__sample--primary { background: var(--color-primary); }
.color-swatch__sample--secondary { background: var(--color-secondary); }
.color-swatch__sample--accent { background: var(--color-accent); }
.color-swatch__sample--background { background: var(--color-background); }
.color-swatch__sample--surface { background: var(--color-surface); }
.color-swatch__sample--border { background: var(--color-border); }
.color-swatch__sample--text { background: var(--color-text); }
.color-swatch__sample--muted { background: var(--color-text-muted); }

/*
 * Buttons
 */

.button {
    min-height: 42px;
    padding: 10px 18px;
    border: 1px solid transparent;
    border-radius: var(--radius-small);
    font-weight: var(--font-weight-medium);
    transition:
        background-color 140ms ease,
        border-color 140ms ease,
        color 140ms ease,
        opacity 140ms ease;
}

.button--primary {
    border-color: var(--color-primary);
    background: var(--color-primary);
    color: var(--color-background);
}

.button--primary:hover:not(:disabled) {
    border-color: var(--color-hover);
    background: var(--color-hover);
}

.button--secondary {
    border-color: var(--color-secondary);
    background: var(--color-secondary);
    color: #ffffff;
}

.button--secondary:hover:not(:disabled) {
    filter: brightness(0.92);
}

.button--tertiary {
    border-color: var(--color-secondary);
    background: transparent;
    color: var(--color-text);
}

.button--tertiary:hover:not(:disabled) {
    background: var(--color-surface-alt);
}

.button:disabled {
    opacity: 0.45;
}

/*
 * Form elements
 */

.field {
    display: grid;
    gap: 7px;
}

.field__label,
.radio-group legend {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

.input {
    width: 100%;
    min-height: 42px;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    background: var(--color-surface);
    color: var(--color-text);
    transition:
        border-color 140ms ease,
        background-color 140ms ease;
}

.input:hover {
    border-color: var(--color-secondary);
}

.input:focus {
    border-color: var(--color-focus);
}

.input::placeholder {
    color: var(--color-text-muted);
    opacity: 1;
}

.choice {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: var(--font-size-sm);
}

.choice input {
    width: 17px;
    height: 17px;
    margin: 0;
    accent-color: var(--color-secondary);
}

.radio-group {
    display: grid;
    gap: 10px;
    margin: 0;
    padding: 0;
    border: 0;
}

.radio-group legend {
    margin-bottom: 8px;
}

/*
 * Custom select
 *
 * Replaces the native select popup so styling remains consistent
 * across desktop and mobile browsers.
 */

.select {
    position: relative;
    width: 100%;
}

.select__trigger {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    width: 100%;
    min-height: 42px;
    padding: 9px 12px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
    background: var(--color-surface);
    color: var(--color-text);
    text-align: left;
    transition:
        border-color 140ms ease,
        background-color 140ms ease;
}

.select__trigger:hover {
    border-color: var(--color-secondary);
}

.select__trigger[aria-expanded="true"] {
    border-color: var(--color-focus);
}

/* Draw the chevron in CSS for consistent alignment on every platform. */
.select__chevron {
    flex: 0 0 auto;
    width: 8px;
    height: 8px;
    margin-right: 2px;
    border-right: 1.5px solid var(--color-text-muted);
    border-bottom: 1.5px solid var(--color-text-muted);
    transform: translateY(-2px) rotate(45deg);
    transition: transform 140ms ease;
}

.select__trigger[aria-expanded="true"] .select__chevron {
    transform: translateY(2px) rotate(225deg);
}

.select__dropdown {
    position: absolute;
    z-index: 20;
    top: calc(100% + 5px);
    right: 0;
    left: 0;
    display: grid;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-4px);
    transition:
        opacity 120ms ease,
        visibility 120ms ease,
        transform 120ms ease;
}

.select.is-open .select__dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.select__option {
    width: 100%;
    min-height: 42px;
    padding: 10px 12px;
    border: 0;
    border-radius: 0;
    background: transparent;
    color: var(--color-text);
    text-align: left;
    transition:
        background-color 120ms ease,
        color 120ms ease;
}

.select__option + .select__option {
    border-top: 1px solid var(--color-border);
}

.select__option:hover,
.select__option:focus-visible,
.select__option.is-selected {
    background: var(--color-surface-alt);
}

.select__option.is-selected {
    color: var(--color-text);
    font-weight: var(--font-weight-medium);
}

.select__option:focus-visible {
    position: relative;
    z-index: 1;
    outline: 2px solid var(--color-focus);
    outline-offset: -2px;
}

/*
 * Badges
 */

.badge-list {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
}

.badge {
    display: inline-flex;
    align-items: center;
    min-height: 25px;
    padding: 3px 10px;
    border-radius: var(--radius-small);
    background: var(--color-surface-alt);
    color: var(--color-text);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
}

.badge--info { background: var(--color-info); color: var(--color-info-text); }
.badge--success { background: var(--color-success); color: var(--color-success-text); }
.badge--warning { background: var(--color-warning); color: var(--color-warning-text); }
.badge--error { background: var(--color-error); color: var(--color-error-text); }

/*
 * Card
 */

.card {
    display: grid;
    grid-template-columns: minmax(130px, 34%) 1fr;
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: var(--color-surface);
    box-shadow: var(--shadow-card);
}

.card__visual {
    min-height: 170px;
    background:
        linear-gradient(
            165deg,
            transparent 0 43%,
            rgb(231 236 238 / 75%) 44% 48%,
            transparent 49%
        ),
        linear-gradient(
            180deg,
            #657786 0%,
            #394d5c 42%,
            #708d9c 43%,
            #304551 68%,
            #17252e 100%
        );
}

.card__content {
    align-self: center;
    padding: 24px;
}

.card__title {
    margin: 0 0 10px;
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
}

.card__description {
    margin: 0 0 20px;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
}

.text-link {
    color: var(--color-secondary);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
}

/*
 * List
 */

.list {
    overflow: hidden;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: var(--color-surface);
}

.list-item {
    position: relative;
    display: block;
    width: 100%;
    padding: 14px 38px 14px 16px;
    border: 0;
    background: transparent;
    color: var(--color-text);
    text-align: left;
}

.list-item + .list-item {
    border-top: 1px solid var(--color-border);
}

.list-item:hover {
    background: var(--color-surface-alt);
}

.list-item::after {
    position: absolute;
    top: 50%;
    right: 17px;
    width: 7px;
    height: 7px;
    border-top: 1px solid currentColor;
    border-right: 1px solid currentColor;
    content: "";
    transform: translateY(-50%) rotate(45deg);
}

.list-item strong,
.list-item small {
    display: block;
}

.list-item strong {
    margin-bottom: 4px;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
}

.list-item small {
    color: var(--color-text-muted);
    font-size: var(--font-size-xs);
}

/*
 * Tabs
 */

.tabs {
    display: flex;
    border-bottom: 1px solid var(--color-border);
}

.tab {
    position: relative;
    padding: 11px 22px;
    border: 0;
    background: transparent;
    color: var(--color-text-muted);
    font-size: var(--font-size-sm);
}

.tab:hover,
.tab.is-active {
    color: var(--color-text);
}

.tab.is-active::after {
    position: absolute;
    right: 0;
    bottom: -1px;
    left: 0;
    height: 2px;
    background: var(--color-secondary);
    content: "";
}

/*
 * Toggle
 */

.toggle-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    font-size: var(--font-size-sm);
}

.toggle-input {
    position: relative;
    width: 44px;
    height: 24px;
    margin: 0;
    appearance: none;
    border: 1px solid var(--color-border);
    border-radius: 999px;
    background: var(--color-surface-alt);
    transition: background-color 160ms ease;
}

.toggle-input::after {
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-text-muted);
    content: "";
    transition:
        transform 160ms ease,
        background-color 160ms ease;
}

.toggle-input:checked {
    background: var(--color-secondary);
}

.toggle-input:checked::after {
    background: var(--color-surface);
    transform: translateX(20px);
}

/*
 * Palette legend
 */

.palette-legend {
    margin-top: 32px;
    padding: 22px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-medium);
    background: var(--color-surface);
}

.palette-legend__content {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px 24px;
}

.legend-color {
    display: grid;
    grid-template-columns: 28px 1fr;
    grid-template-rows: auto auto;
    column-gap: 10px;
    font-size: var(--font-size-xs);
}

.legend-color__sample {
    grid-row: 1 / 3;
    width: 28px;
    height: 28px;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-small);
}

.legend-color strong {
    font-weight: var(--font-weight-medium);
}

.legend-color code {
    color: var(--color-text-muted);
    font-family: var(--font-family-mono);
    font-size: 0.68rem;
}

/*
 * Responsive adaptations
 */

@media (max-width: 1000px) {
    .palette {
        grid-template-columns: repeat(4, 1fr);
    }

    .component-grid {
        grid-template-columns: 1fr;
    }

    .component-grid > .demo-section {
        padding: 28px 0;
    }

    .component-grid > .demo-section + .demo-section {
        border-top: 1px solid var(--color-border);
        border-left: 0;
    }

    .content-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 650px) {
    .style-guide {
        width: min(100% - 28px, 1480px);
        padding-block: 24px;
    }

    .style-guide__header {
        flex-direction: column;
    }

    .palette {
        grid-template-columns: repeat(2, 1fr);
    }

    .palette-legend__content {
        grid-template-columns: repeat(2, 1fr);
    }

    .card {
        grid-template-columns: 1fr;
    }

    .card__visual {
        min-height: 140px;
    }

    .tabs {
        overflow-x: auto;
    }

    .tab {
        flex: 0 0 auto;
    }

    .typography-sample {
        grid-template-columns: 1fr;
        gap: 6px;
    }
}

@media (pointer: coarse) {
    .select__trigger,
    .select__option {
        min-height: 46px;
    }
}

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