/*
 * Button Design System
 * Single source of truth for button-like controls across the static portfolio.
 * Variants intentionally hardcode text/background pairings for WCAG-safe contrast.
 */

:root {
    --button-radius: var(--comp-button-radius);
    --button-min-height: var(--comp-button-min-height);
    --button-padding-y: var(--comp-button-padding-y);
    --button-padding-x: var(--comp-button-padding-x);
    --button-font-size: 0.8125rem;
    --button-font-weight: 700;
    --button-letter-spacing: 0.08em;
    --button-transition: 0.3s cubic-bezier(0.25, 1, 0.5, 1);

    --button-primary-bg: var(--color-accent);
    --button-primary-text: var(--color-on-accent);
    --button-primary-border: var(--color-accent);
    --button-primary-hover-bg: var(--color-accent-hover);
    --button-primary-hover-text: var(--color-on-accent);

    --button-secondary-bg: transparent;
    --button-secondary-text: var(--color-text);
    --button-secondary-border: color-mix(in srgb, var(--color-text) 72%, transparent);
    --button-secondary-hover-bg: var(--color-text);
    --button-secondary-hover-text: var(--color-on-accent);
    --button-secondary-hover-border: var(--color-text);

    --button-ghost-bg: transparent;
    --button-ghost-text: var(--color-text-light);
    --button-ghost-hover-bg: transparent;
    --button-ghost-hover-text: var(--color-text);

    --button-chip-bg: var(--color-surface-muted);
    --button-chip-text: var(--color-text);
    --button-chip-border: var(--color-border);
    --button-chip-hover-bg: color-mix(in srgb, var(--color-surface-muted) 82%, var(--color-text));
    --button-chip-hover-text: var(--color-text);
    --button-chip-active-bg: var(--color-accent);
    --button-chip-active-text: var(--color-on-accent);
}

:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn) {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: var(--button-min-height);
    padding: var(--button-padding-y) var(--button-padding-x);
    border: 1px solid transparent;
    border-radius: var(--button-radius);
    font-family: var(--font-sans);
    font-size: var(--button-font-size);
    font-weight: var(--button-font-weight);
    letter-spacing: var(--button-letter-spacing);
    line-height: 1.1;
    text-align: center;
    text-decoration: none;
    text-transform: uppercase;
    white-space: nowrap;
    cursor: pointer;
    box-sizing: border-box;
    transition:
        transform var(--button-transition),
        opacity var(--button-transition),
        border-color var(--button-transition),
        background-color var(--button-transition),
        color var(--button-transition),
        box-shadow var(--button-transition);
}

:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn):hover {
    transform: translateY(-2px);
    text-decoration: none;
}

.home-cta::before {
    display: none;
}

:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn):active {
    transform: translateY(0) scale(0.98);
}

:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn):focus-visible,
:is(.works-filter-chip, .category-tab, .cs-carousel-btn):focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn):disabled,
:is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn)[aria-disabled="true"] {
    opacity: 0.48;
    pointer-events: none;
    cursor: not-allowed;
}

:is(.button--primary, .btn--primary, .home-cta-primary, .form-submit-btn) {
    border-color: var(--button-primary-border);
    background: var(--button-primary-bg);
    color: var(--button-primary-text);
    box-shadow: var(--comp-button-shadow);
}

:is(.button--primary, .btn--primary, .home-cta-primary, .form-submit-btn):hover,
:is(.button--primary, .btn--primary, .home-cta-primary, .form-submit-btn):focus-visible {
    border-color: var(--button-primary-hover-bg);
    background: var(--button-primary-hover-bg);
    color: var(--button-primary-hover-text);
    box-shadow: var(--comp-button-shadow-hover);
}

:is(.button--secondary, .btn--secondary, .home-cta-secondary, .works-explore-btn) {
    border-color: var(--button-secondary-border);
    background: var(--button-secondary-bg);
    color: var(--button-secondary-text);
    box-shadow: none;
}

:is(.button--secondary, .btn--secondary, .home-cta-secondary, .works-explore-btn)::after {
    display: none;
}

:is(.button--secondary, .btn--secondary, .home-cta-secondary, .works-explore-btn):hover,
:is(.button--secondary, .btn--secondary, .home-cta-secondary, .works-explore-btn):focus-visible {
    border-color: var(--button-secondary-hover-border);
    background: var(--button-secondary-hover-bg);
    color: var(--button-secondary-hover-text);
    box-shadow: var(--comp-button-shadow-hover);
}

body.page-home .button--secondary.home-cta-secondary:hover,
body.page-home .button--secondary.home-cta-secondary:focus-visible {
    border-color: var(--button-secondary-hover-border);
    background: var(--button-secondary-hover-bg);
    color: var(--button-secondary-hover-text);
}

:is(.button--ghost, .btn--ghost, .home-cta-ghost) {
    min-height: auto;
    padding-inline: 0;
    border-color: transparent;
    background: var(--button-ghost-bg);
    color: var(--button-ghost-text);
    box-shadow: none;
}

:is(.button--ghost, .btn--ghost, .home-cta-ghost):hover,
:is(.button--ghost, .btn--ghost, .home-cta-ghost):focus-visible {
    border-color: transparent;
    background: var(--button-ghost-hover-bg);
    color: var(--button-ghost-hover-text);
    box-shadow: none;
    opacity: 0.78;
}

:is(.button--chip, .btn--chip, .works-filter-chip, .category-tab) {
    min-height: 2rem;
    padding: var(--comp-tag-chip-padding-y) var(--comp-tag-chip-padding-x);
    border: 1px solid var(--button-chip-border);
    border-radius: var(--button-radius);
    background: var(--button-chip-bg);
    color: var(--button-chip-text);
    font-family: var(--font-sans);
    font-size: var(--comp-tag-chip-font-size);
    font-weight: 700;
    letter-spacing: 0.08em;
    line-height: 1.1;
    text-transform: uppercase;
    cursor: pointer;
    transition:
        transform var(--button-transition),
        border-color var(--button-transition),
        background-color var(--button-transition),
        color var(--button-transition),
        box-shadow var(--button-transition);
}

:is(.button--chip, .btn--chip, .works-filter-chip, .category-tab):hover {
    border-color: color-mix(in srgb, var(--color-accent) 38%, var(--button-chip-border));
    background: var(--button-chip-hover-bg);
    color: var(--button-chip-hover-text);
    transform: translateY(-1px);
}

:is(.button--chip, .btn--chip, .works-filter-chip.active, .category-tab.active),
:is(.works-filter-chip, .category-tab)[aria-pressed="true"] {
    border-color: var(--button-chip-active-bg);
    background: var(--button-chip-active-bg);
    color: var(--button-chip-active-text);
}

:is(.works-filter-chip.active, .category-tab.active) :is(.category-tab-number, .category-tab-name) {
    color: var(--button-chip-active-text);
}

.cs-carousel-btn {
    display: inline-grid;
    place-items: center;
    width: 2.5rem;
    height: 2.5rem;
    border: 1px solid var(--button-chip-border);
    border-radius: var(--button-radius);
    background: var(--button-chip-bg);
    color: var(--button-chip-text);
    cursor: pointer;
    transition:
        transform var(--button-transition),
        border-color var(--button-transition),
        background-color var(--button-transition),
        color var(--button-transition);
}

.cs-carousel-btn:hover {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: var(--color-on-accent);
    transform: translateY(-1px);
}

@media (max-width: 768px) {
    :is(.button, .btn, .home-cta, .works-explore-btn, .form-submit-btn) {
        width: auto;
        max-width: 100%;
        white-space: normal;
    }
}