/**
 * WWPosts Design System — Phase 0 buttons
 * =======================================
 * Non-ordinary button language built on design tokens.
 * Coexists with Bootstrap `.btn` during migration — prefer `.cp-btn` on new UI.
 *
 * Physical 3D: thick under-bevel, face gradient, emboss highlight, press-in active.
 *
 * Variants: primary | secondary | ghost | danger | success | accent-soft
 * Sizes:    sm | md (default) | lg
 * Modifiers: --block | --icon | --pill
 */

.cp-btn {
    --_btn-bg: var(--cp-raised);
    --_btn-fg: var(--cp-ink);
    --_btn-border: var(--cp-border-strong);
    --_btn-shadow: var(--cp-shadow-sm);
    --_btn-glow: transparent;
    --_btn-height: var(--cp-control-height, 42px);
    --_btn-pad-x: 1.15rem;
    --_btn-radius: var(--cp-radius-md);
    --_btn-font: var(--cp-text-sm);
    --_btn-weight: 700;
    --_btn-tracking: 0.02em;
    --_btn-bevel: 3px;

    appearance: none;
    position: relative;
    box-sizing: border-box;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    min-height: var(--_btn-height);
    height: auto;
    padding: 0 var(--_btn-pad-x);
    margin: 0;
    border: 1px solid var(--_btn-border);
    border-radius: var(--_btn-radius);
    background: var(--_btn-bg);
    color: var(--_btn-fg);
    font-family: var(--cp-font-sans);
    font-size: var(--_btn-font);
    font-weight: var(--_btn-weight);
    letter-spacing: var(--_btn-tracking);
    line-height: 1.2;
    text-decoration: none;
    text-align: center;
    white-space: nowrap;
    cursor: pointer;
    -webkit-user-select: none;
    user-select: none;
    vertical-align: middle;
    transform: translateY(0);
    box-shadow:
        var(--_btn-shadow),
        0 var(--_btn-bevel) 0 color-mix(in srgb, var(--_btn-border) 75%, #000000),
        inset 0 1px 0 rgba(255, 255, 255, 0.28),
        inset 0 -1px 0 rgba(0, 0, 0, 0.18);
    transition:
        transform var(--cp-duration-fast) var(--cp-ease-out),
        box-shadow var(--cp-duration-med) var(--cp-ease-out),
        background-color var(--cp-duration-fast) ease,
        border-color var(--cp-duration-fast) ease,
        color var(--cp-duration-fast) ease,
        filter var(--cp-duration-fast) ease;
}

.cp-btn:hover {
    transform: translateY(-2px);
    filter: brightness(1.07);
    text-decoration: none;
    color: var(--_btn-fg);
    box-shadow:
        var(--_btn-shadow),
        0 calc(var(--_btn-bevel) + 2px) 0 color-mix(in srgb, var(--_btn-border) 70%, #000000),
        0 10px 28px color-mix(in srgb, var(--_btn-glow) 35%, transparent),
        0 0 0 1px color-mix(in srgb, var(--_btn-glow) 45%, transparent),
        inset 0 1px 0 rgba(255, 255, 255, 0.35),
        inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

.cp-btn:active {
    transform: translateY(2px) scale(0.985);
    filter: brightness(0.96);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.35),
        0 0 0 1px color-mix(in srgb, var(--_btn-glow) 30%, transparent),
        inset 0 3px 8px rgba(0, 0, 0, 0.35),
        inset 0 1px 0 rgba(0, 0, 0, 0.2);
}

.cp-btn:focus-visible {
    outline: none;
    box-shadow:
        var(--_btn-shadow),
        0 var(--_btn-bevel) 0 color-mix(in srgb, var(--_btn-border) 75%, #000000),
        var(--cp-focus-ring),
        inset 0 1px 0 rgba(255, 255, 255, 0.28);
}

.cp-btn:disabled,
.cp-btn[aria-disabled="true"],
.cp-btn.disabled {
    opacity: 0.45;
    cursor: not-allowed;
    pointer-events: none;
    transform: none;
    filter: grayscale(0.25);
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.08),
        inset 0 -1px 0 rgba(0, 0, 0, 0.12);
}

/* --- Variants ------------------------------------------------------------- */

.cp-btn--primary {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-accent) 94%, #ffffff) 0%,
        var(--cp-accent) 38%,
        var(--cp-accent-strong) 72%,
        color-mix(in srgb, var(--cp-accent-strong) 65%, #002433) 100%
    );
    --_btn-fg: var(--cp-accent-ink);
    --_btn-border: color-mix(in srgb, var(--cp-accent) 40%, #001820);
    --_btn-shadow: var(--cp-shadow-md);
    --_btn-glow: var(--cp-accent-glow);
    --_btn-bevel: 4px;
    background: var(--_btn-bg);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

.cp-btn--secondary {
    --_btn-bg: linear-gradient(
        180deg,
        color-mix(in srgb, var(--cp-overlay) 92%, #ffffff) 0%,
        var(--cp-raised) 55%,
        color-mix(in srgb, var(--cp-raised) 78%, #000000) 100%
    );
    --_btn-fg: var(--cp-ink);
    --_btn-border: var(--cp-border-strong);
    --_btn-glow: var(--cp-accent);
    background: var(--_btn-bg);
}

.cp-btn--ghost {
    --_btn-bg: transparent;
    --_btn-fg: var(--cp-ink);
    --_btn-border: var(--cp-border);
    --_btn-shadow: none;
    --_btn-glow: var(--cp-accent);
    --_btn-bevel: 0px;
    background: transparent;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.06),
        inset 0 0 0 1px var(--cp-border);
}

.cp-btn--ghost:hover {
    background: var(--cp-accent-soft);
    border-color: var(--cp-border-strong);
    color: var(--cp-accent);
    box-shadow:
        0 6px 20px color-mix(in srgb, var(--cp-accent-glow) 25%, transparent),
        inset 0 1px 0 rgba(255, 255, 255, 0.1),
        inset 0 0 0 1px var(--cp-border-strong);
}

.cp-btn--accent-soft {
    --_btn-bg: linear-gradient(
        180deg,
        color-mix(in srgb, var(--cp-accent-soft) 70%, #ffffff) 0%,
        var(--cp-accent-soft) 100%
    );
    --_btn-fg: var(--cp-accent);
    --_btn-border: color-mix(in srgb, var(--cp-accent) 45%, transparent);
    --_btn-glow: var(--cp-accent-glow);
    background: var(--_btn-bg);
}

.cp-btn--danger {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-danger) 90%, #ffffff) 0%,
        var(--cp-danger) 55%,
        color-mix(in srgb, var(--cp-danger) 70%, #400010) 100%
    );
    --_btn-fg: #fff;
    --_btn-border: color-mix(in srgb, var(--cp-danger) 45%, #000000);
    --_btn-glow: color-mix(in srgb, var(--cp-danger) 55%, transparent);
    --_btn-bevel: 4px;
    background: var(--_btn-bg);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.cp-btn--success {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-success) 90%, #ffffff) 0%,
        var(--cp-success) 55%,
        color-mix(in srgb, var(--cp-success) 70%, #041208) 100%
    );
    --_btn-fg: #041208;
    --_btn-border: color-mix(in srgb, var(--cp-success) 45%, #000000);
    --_btn-glow: color-mix(in srgb, var(--cp-success) 50%, transparent);
    --_btn-bevel: 4px;
    background: var(--_btn-bg);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* --- Sizes ---------------------------------------------------------------- */

.cp-btn--sm {
    --_btn-height: 34px;
    --_btn-pad-x: 0.85rem;
    --_btn-font: var(--cp-text-xs);
    --_btn-radius: var(--cp-radius-sm);
    --_btn-bevel: 2px;
}

.cp-btn--lg {
    --_btn-height: 50px;
    --_btn-pad-x: 1.5rem;
    --_btn-font: var(--cp-text-md);
    --_btn-radius: var(--cp-radius-lg);
    --_btn-tracking: 0.03em;
    --_btn-bevel: 5px;
}

.cp-btn--pill {
    --_btn-radius: var(--cp-radius-pill);
}

.cp-btn--block {
    display: flex;
    width: 100%;
}

.cp-btn--icon {
    --_btn-pad-x: 0;
    width: var(--_btn-height);
    min-width: var(--_btn-height);
    padding: 0;
}

.cp-btn i,
.cp-btn .fas,
.cp-btn .far,
.cp-btn .fab {
    font-size: 0.95em;
    line-height: 1;
    filter: drop-shadow(0 1px 0 rgba(255, 255, 255, 0.2));
}

/* Button row for footers / toolbars */
.cp-btn-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.65rem;
    align-items: center;
    justify-content: center;
}

.cp-btn-row--start { justify-content: flex-start; }
.cp-btn-row--end { justify-content: flex-end; }

@media (max-width: 389.98px) {
    .cp-btn-row--stack-phone {
        flex-direction: column;
        align-items: stretch;
    }

    .cp-btn-row--stack-phone .cp-btn {
        width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .cp-btn,
    .cp-btn:hover,
    .cp-btn:active {
        transition: none;
        transform: none;
    }
}

/* -------------------------------------------------------------------------- */
/* Bridge: Bootstrap `.btn-*` → design-system 3D chrome (same as `.cp-btn`)     */
/* Category / nav chips keep their own skins via :not() exclusions.             */
/* -------------------------------------------------------------------------- */
.btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):not(.cp-radio-pill *):not(.cp-theme-toggle *):not(.cp-units-toggle *),
.btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):not(.cp-radio-pill *):not(.cp-theme-toggle *):not(.cp-units-toggle *),
.btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):not(.cp-radio-pill *):not(.cp-theme-toggle *):not(.cp-units-toggle *),
.btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):not(.cp-radio-pill *):not(.cp-theme-toggle *):not(.cp-units-toggle *),
.btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):not(.cp-radio-pill *):not(.cp-theme-toggle *):not(.cp-units-toggle *) {
    --_btn-bevel: 3px;
    appearance: none;
    position: relative;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    box-sizing: border-box;
    min-height: var(--cp-control-height, 42px);
    padding: 0 0.9rem;
    border: 1px solid var(--_btn-border);
    border-radius: var(--cp-radius-md);
    background: var(--_btn-bg);
    color: var(--_btn-fg) !important;
    font-size: 0.8125rem;
    font-weight: 700;
    letter-spacing: 0.02em;
    line-height: 1.2;
    box-shadow:
        var(--cp-shadow-sm),
        0 var(--_btn-bevel) 0 color-mix(in srgb, var(--_btn-border) 75%, #000000),
        inset 0 1px 0 rgba(255, 255, 255, 0.28),
        inset 0 -1px 0 rgba(0, 0, 0, 0.18);
    transition:
        transform var(--cp-duration-fast) var(--cp-ease-out),
        box-shadow var(--cp-duration-med) var(--cp-ease-out),
        filter var(--cp-duration-fast) ease;
}

.btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item) {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-accent) 94%, #ffffff) 0%,
        var(--cp-accent) 38%,
        var(--cp-accent-strong) 72%,
        color-mix(in srgb, var(--cp-accent-strong) 65%, #002433) 100%
    );
    --_btn-fg: var(--cp-accent-ink);
    --_btn-border: color-mix(in srgb, var(--cp-accent) 40%, #001820);
    --_btn-glow: var(--cp-accent-glow);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item) {
    --_btn-bg: linear-gradient(
        180deg,
        color-mix(in srgb, var(--cp-overlay) 92%, #ffffff) 0%,
        var(--cp-raised) 55%,
        color-mix(in srgb, var(--cp-raised) 78%, #000000) 100%
    );
    --_btn-fg: var(--cp-ink);
    --_btn-border: var(--cp-border-strong);
    --_btn-glow: var(--cp-accent);
    text-shadow: none;
}

.btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item) {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-success) 90%, #ffffff) 0%,
        var(--cp-success) 55%,
        color-mix(in srgb, var(--cp-success) 70%, #041208) 100%
    );
    --_btn-fg: #041208;
    --_btn-border: color-mix(in srgb, var(--cp-success) 45%, #000000);
    --_btn-glow: color-mix(in srgb, var(--cp-success) 50%, transparent);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item) {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-warning, #ffc107) 92%, #ffffff) 0%,
        var(--cp-warning, #ffc107) 50%,
        color-mix(in srgb, var(--cp-warning, #ffc107) 65%, #5c3b00) 100%
    );
    --_btn-fg: #1a1200;
    --_btn-border: color-mix(in srgb, var(--cp-warning, #ffc107) 45%, #000000);
    --_btn-glow: color-mix(in srgb, var(--cp-warning, #ffc107) 45%, transparent);
    text-shadow: 0 1px 0 rgba(255, 255, 255, 0.35);
}

.btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item) {
    --_btn-bg: linear-gradient(
        175deg,
        color-mix(in srgb, var(--cp-danger) 90%, #ffffff) 0%,
        var(--cp-danger) 55%,
        color-mix(in srgb, var(--cp-danger) 70%, #400010) 100%
    );
    --_btn-fg: #fff;
    --_btn-border: color-mix(in srgb, var(--cp-danger) 45%, #000000);
    --_btn-glow: color-mix(in srgb, var(--cp-danger) 55%, transparent);
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.35);
}

.btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):hover,
.btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):focus-visible,
.btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):hover,
.btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):focus-visible,
.btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):hover,
.btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):focus-visible,
.btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):hover,
.btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):focus-visible,
.btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):hover,
.btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):focus-visible {
    color: var(--_btn-fg) !important;
    background: var(--_btn-bg);
    border-color: var(--_btn-border);
    filter: brightness(1.07);
    transform: translateY(-2px);
    box-shadow:
        var(--cp-shadow-md),
        0 calc(var(--_btn-bevel) + 2px) 0 color-mix(in srgb, var(--_btn-border) 70%, #000000),
        0 10px 28px color-mix(in srgb, var(--_btn-glow) 35%, transparent),
        0 0 0 1px color-mix(in srgb, var(--_btn-glow) 45%, transparent),
        inset 0 1px 0 rgba(255, 255, 255, 0.35),
        inset 0 -1px 0 rgba(0, 0, 0, 0.2);
}

.btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):active,
.btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):active,
.btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):active,
.btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):active,
.btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip):not(.dropdown-item):active {
    color: var(--_btn-fg) !important;
    filter: brightness(0.96);
    transform: translateY(2px) scale(0.985);
    box-shadow:
        0 1px 2px rgba(0, 0, 0, 0.35),
        0 0 0 1px color-mix(in srgb, var(--_btn-glow) 30%, transparent),
        inset 0 3px 8px rgba(0, 0, 0, 0.35);
}

.btn.btn-primary.btn-sm:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-secondary.btn-sm:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-success.btn-sm:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-warning.btn-sm:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-danger.btn-sm:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > .btn.btn-primary:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > .btn.btn-secondary:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > .btn.btn-success:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > .btn.btn-warning:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > .btn.btn-danger:not(.cp-btn-cat):not(.cp-user-chip),
.btn-group-sm > label.btn.btn-primary:not(.cp-btn-cat),
.btn-group-sm > label.btn.btn-secondary:not(.cp-btn-cat),
.btn-group-sm > label.btn.btn-success:not(.cp-btn-cat),
.btn-group-sm > label.btn.btn-warning:not(.cp-btn-cat),
.btn-group-sm > label.btn.btn-danger:not(.cp-btn-cat) {
    min-height: 34px;
    height: 34px;
    max-height: 34px;
    padding: 0 0.75rem;
    font-size: 0.75rem;
    border-radius: var(--cp-radius-sm);
    --_btn-bevel: 2px;
}

/* Form section triggers (Tags, Look up, GPX load, etc.) — same compact height as btn-sm.
   Covers direct buttons in collapsible section bodies so file/load actions stay compact. */
.cp-tag-picker-trigger.btn,
.cp-loc-field-lookup-btn.btn,
#load-gpx-route-btn.btn,
.cp-user-group__content > .btn.btn-primary,
.cp-user-group__content > .btn.btn-secondary,
.cp-user-group__content > .btn.btn-success,
.cp-user-group__content > .btn.btn-warning,
.cp-user-group__content > .btn.btn-danger,
.cp-user-group__content > p + .btn.btn-primary,
.cp-user-group__content > .form-text + .btn.btn-primary,
.cp-user-group__content > input[type="file"] + .btn.btn-primary,
.cp-user-group__content > input[type="file"] + .btn.btn-sm.btn-primary {
    min-height: 34px !important;
    height: 34px !important;
    max-height: 34px !important;
    padding: 0 0.75rem !important;
    font-size: 0.75rem !important;
    --_btn-bevel: 2px;
    align-self: center !important;
}

.cp-tag-picker-trigger .cp-tag-picker-trigger-count {
    font-size: 0.65rem;
    line-height: 1;
    padding: 0.2rem 0.45rem;
}

.btn.btn-primary.btn-lg:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-secondary.btn-lg:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-success.btn-lg:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-warning.btn-lg:not(.cp-btn-cat):not(.cp-user-chip),
.btn.btn-danger.btn-lg:not(.cp-btn-cat):not(.cp-user-chip) {
    min-height: 48px;
    height: 48px;
    max-height: 48px;
    padding: 0 1.35rem;
    font-size: var(--cp-text-md);
    border-radius: var(--cp-radius-lg);
    --_btn-bevel: 4px;
}

.btn.btn-primary:disabled:not(.cp-btn-cat),
.btn.btn-primary.disabled:not(.cp-btn-cat),
.btn.btn-secondary:disabled:not(.cp-btn-cat),
.btn.btn-secondary.disabled:not(.cp-btn-cat),
.btn.btn-success:disabled:not(.cp-btn-cat),
.btn.btn-success.disabled:not(.cp-btn-cat),
.btn.btn-warning:disabled:not(.cp-btn-cat),
.btn.btn-warning.disabled:not(.cp-btn-cat),
.btn.btn-danger:disabled:not(.cp-btn-cat),
.btn.btn-danger.disabled:not(.cp-btn-cat) {
    opacity: 0.45;
    filter: grayscale(0.25);
    transform: none;
    box-shadow:
        inset 0 1px 0 rgba(255, 255, 255, 0.08),
        inset 0 -1px 0 rgba(0, 0, 0, 0.12);
}