/*
 * ECM Studio UI primitives
 *
 * Scope: opt-in component classes only. This file intentionally does not style
 * bare button, input, textarea, or select elements.
 */

:root {
    --ecm-studio-canvas: var(--ui-canvas, #f7f8fa);
    --ecm-studio-surface: var(--ui-surface, #ffffff);
    --ecm-studio-surface-raised: var(--ui-surface-raised, #ffffff);
    --ecm-studio-subtle: var(--ui-subtle, #f8f9fa);
    --ecm-studio-subtle-strong: var(--ui-subtle-strong, #eef2f7);
    --ecm-studio-text: var(--ui-text, #202124);
    --ecm-studio-muted: var(--ui-muted, #5f6368);
    --ecm-studio-border: var(--ui-border, #dadce0);
    --ecm-studio-border-strong: var(--ui-border-strong, #bdc1c6);
    --ecm-studio-accent: var(--accent-solid, #1a73e8);
    --ecm-studio-accent-hover: var(--accent-hover, #1765cc);
    --ecm-studio-accent-text: var(--accent-text, #174ea6);
    --ecm-studio-on-accent: var(--on-accent, #ffffff);
    --ecm-studio-accent-soft: var(--accent-soft, #e8f0fe);
    --ecm-studio-accent-border: var(--accent-border, #aecbfa);
    --ecm-studio-danger: #b3261e;
    --ecm-studio-danger-hover: #8c1d18;
    --ecm-studio-danger-solid: #b3261e;
    --ecm-studio-danger-solid-hover: #8c1d18;
    --ecm-studio-on-danger: #ffffff;
    --ecm-studio-danger-soft: #fce8e6;
    --ecm-studio-danger-border: #f2b8b5;
    --ecm-studio-focus: var(--ui-focus, rgba(26, 115, 232, .24));
    --ecm-studio-shadow-soft: 0 1px 2px rgba(60, 64, 67, .08), 0 1px 3px rgba(60, 64, 67, .06);
    --ecm-studio-shadow-raised: 0 4px 14px rgba(60, 64, 67, .12);
}

html[data-theme="dark"] {
    --ecm-studio-canvas: var(--ui-canvas, #0b1220);
    --ecm-studio-surface: var(--ui-surface, #111827);
    --ecm-studio-surface-raised: var(--ui-surface-raised, #172033);
    --ecm-studio-subtle: var(--ui-subtle, #0f172a);
    --ecm-studio-subtle-strong: var(--ui-subtle-strong, #1e293b);
    --ecm-studio-text: var(--ui-text, #f3f4f6);
    --ecm-studio-muted: var(--ui-muted, #b6c2d1);
    --ecm-studio-border: var(--ui-border, #334155);
    --ecm-studio-border-strong: var(--ui-border-strong, #64748b);
    --ecm-studio-accent-text: var(--accent-text, #a8c7fa);
    --ecm-studio-accent-soft: var(--accent-soft, #183153);
    --ecm-studio-accent-border: var(--accent-border, #315d93);
    --ecm-studio-danger: #ffb4ab;
    --ecm-studio-danger-hover: #ffd8d3;
    --ecm-studio-danger-solid: #b3261e;
    --ecm-studio-danger-solid-hover: #8c1d18;
    --ecm-studio-on-danger: #ffffff;
    --ecm-studio-danger-soft: #561d19;
    --ecm-studio-danger-border: #8c4a45;
    --ecm-studio-shadow-soft: 0 1px 2px rgba(0, 0, 0, .24);
    --ecm-studio-shadow-raised: 0 5px 18px rgba(0, 0, 0, .32);
}

@media (prefers-color-scheme: dark) {
    html:not([data-theme]) {
        --ecm-studio-canvas: #0b1220;
        --ecm-studio-surface: #111827;
        --ecm-studio-surface-raised: #172033;
        --ecm-studio-subtle: #0f172a;
        --ecm-studio-subtle-strong: #1e293b;
        --ecm-studio-text: #f3f4f6;
        --ecm-studio-muted: #b6c2d1;
        --ecm-studio-border: #334155;
        --ecm-studio-border-strong: #64748b;
        --ecm-studio-accent-text: #a8c7fa;
        --ecm-studio-accent-soft: #183153;
        --ecm-studio-accent-border: #315d93;
        --ecm-studio-danger: #ffb4ab;
        --ecm-studio-danger-hover: #ffd8d3;
        --ecm-studio-danger-solid: #b3261e;
        --ecm-studio-danger-solid-hover: #8c1d18;
        --ecm-studio-on-danger: #ffffff;
        --ecm-studio-danger-soft: #561d19;
        --ecm-studio-danger-border: #8c4a45;
        --ecm-studio-shadow-soft: 0 1px 2px rgba(0, 0, 0, .24);
        --ecm-studio-shadow-raised: 0 5px 18px rgba(0, 0, 0, .32);
    }
}

.ecm-button,
.ecm-icon-button,
.ecm-attachment-button,
.ecm-attachment-chip {
    box-sizing: border-box;
    font: inherit;
    -webkit-tap-highlight-color: transparent;
}

.ecm-button {
    min-height: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 0 18px;
    border: 1px solid var(--ecm-studio-border);
    border-radius: 999px;
    background: var(--ecm-studio-surface);
    color: var(--ecm-studio-text);
    box-shadow: none;
    font-size: 13px;
    font-weight: 650;
    line-height: 1.2;
    white-space: nowrap;
    cursor: pointer;
    transition: background-color .16s ease, border-color .16s ease, color .16s ease, box-shadow .16s ease, transform .08s ease;
}

.ecm-button:hover {
    border-color: var(--ecm-studio-border-strong);
    background: var(--ecm-studio-subtle);
    box-shadow: var(--ecm-studio-shadow-soft);
}

.ecm-button:active:not(:disabled):not([aria-disabled="true"]) {
    transform: translateY(1px);
    box-shadow: none;
}

.ecm-button--primary,
.ecm-button.primary {
    border-color: var(--ecm-studio-accent);
    background: var(--ecm-studio-accent);
    color: var(--ecm-studio-on-accent);
}

.ecm-button--primary:hover,
.ecm-button.primary:hover {
    border-color: var(--ecm-studio-accent-hover);
    background: var(--ecm-studio-accent-hover);
    color: var(--ecm-studio-on-accent);
    box-shadow: var(--ecm-studio-shadow-soft);
}

.ecm-button--secondary,
.ecm-button.secondary {
    border-color: var(--ecm-studio-border);
    background: var(--ecm-studio-surface);
    color: var(--ecm-studio-accent-text);
}

.ecm-button--secondary:hover,
.ecm-button.secondary:hover {
    border-color: var(--ecm-studio-accent-border);
    background: var(--ecm-studio-subtle);
    color: var(--ecm-studio-accent-text);
}

.ecm-button--tonal,
.ecm-button.tonal {
    border-color: transparent;
    background: var(--ecm-studio-accent-soft);
    color: var(--ecm-studio-accent-text);
}

.ecm-button--tonal:hover,
.ecm-button.tonal:hover {
    border-color: var(--ecm-studio-accent-border);
    background: color-mix(in srgb, var(--ecm-studio-accent-soft) 82%, var(--ecm-studio-accent) 18%);
    color: var(--ecm-studio-accent-text);
}

.ecm-button--danger,
.ecm-button.danger {
    border-color: var(--ecm-studio-danger-border);
    background: var(--ecm-studio-danger-soft);
    color: var(--ecm-studio-danger);
}

.ecm-button--danger:hover,
.ecm-button.danger:hover {
    border-color: var(--ecm-studio-danger);
    background: color-mix(in srgb, var(--ecm-studio-danger-soft) 86%, var(--ecm-studio-danger) 14%);
    color: var(--ecm-studio-danger-hover);
}

.ecm-button > svg,
.ecm-button > [data-lucide] {
    width: 17px;
    height: 17px;
    flex: 0 0 auto;
}

.ecm-icon-button,
.ecm-attachment-button {
    width: 40px;
    height: 40px;
    min-width: 40px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 1px solid transparent;
    border-radius: 50%;
    background: transparent;
    color: var(--ecm-studio-muted);
    box-shadow: none;
    cursor: pointer;
    transition: background-color .16s ease, border-color .16s ease, color .16s ease, box-shadow .16s ease, transform .08s ease;
}

.ecm-icon-button:hover,
.ecm-attachment-button:hover {
    border-color: var(--ecm-studio-border);
    background: var(--ecm-studio-subtle-strong);
    color: var(--ecm-studio-text);
}

.ecm-icon-button:active:not(:disabled):not([aria-disabled="true"]),
.ecm-attachment-button:active:not(:disabled):not([aria-disabled="true"]) {
    transform: scale(.96);
}

.ecm-icon-button > svg,
.ecm-icon-button > [data-lucide],
.ecm-attachment-button > svg,
.ecm-attachment-button > [data-lucide] {
    width: 19px;
    height: 19px;
}

.ecm-icon-button.is-active,
.ecm-icon-button[aria-pressed="true"],
.ecm-attachment-button.is-active,
.ecm-attachment-button[aria-expanded="true"],
.ecm-attachment-button[aria-pressed="true"] {
    border-color: var(--ecm-studio-accent-border);
    background: var(--ecm-studio-accent-soft);
    color: var(--ecm-studio-accent-text);
}

.ecm-composer-shell {
    width: 100%;
    min-width: 0;
    display: flex;
    align-items: flex-end;
    gap: 8px;
    padding: 9px 10px;
    border: 1px solid var(--ecm-studio-border);
    border-radius: 22px;
    background: var(--ecm-studio-surface-raised);
    color: var(--ecm-studio-text);
    box-shadow: var(--ecm-studio-shadow-soft);
    transition: border-color .16s ease, box-shadow .16s ease, background-color .16s ease;
}

.ecm-composer-shell:focus-within {
    border-color: var(--ecm-studio-accent-border);
    box-shadow: 0 0 0 3px var(--ecm-studio-focus), var(--ecm-studio-shadow-soft);
}

.ecm-composer-shell > textarea,
.ecm-composer-shell > input,
.ecm-composer-shell .ecm-composer-input {
    min-width: 0;
    min-height: 42px;
    max-height: 180px;
    flex: 1 1 auto;
    padding: 10px 8px;
    border: 0;
    border-radius: 12px;
    outline: 0;
    background: transparent;
    color: var(--ecm-studio-text);
    box-shadow: none;
    font: inherit;
    line-height: 1.55;
    resize: none;
}

.ecm-composer-shell > textarea::placeholder,
.ecm-composer-shell > input::placeholder,
.ecm-composer-shell .ecm-composer-input::placeholder {
    color: var(--ecm-studio-muted);
    opacity: .82;
}

.ecm-composer-main {
    min-width: 0;
    flex: 1 1 auto;
    display: flex;
    align-items: flex-end;
    gap: 6px;
}

.ecm-composer-actions {
    flex: 0 0 auto;
    display: flex;
    align-items: center;
    gap: 6px;
}

.ecm-attachment-button {
    color: var(--ecm-studio-muted);
}

.ecm-attachment-tray {
    width: 100%;
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 8px;
    margin: 8px 0 0;
    padding: 8px;
    border: 1px solid var(--ecm-studio-border);
    border-radius: 14px;
    background: var(--ecm-studio-subtle);
    color: var(--ecm-studio-text);
}

.ecm-attachment-tray:empty,
.ecm-attachment-tray[hidden] {
    display: none;
}

.ecm-attachment-chip {
    max-width: min(100%, 300px);
    min-height: 36px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 8px 6px 11px;
    border: 1px solid var(--ecm-studio-border);
    border-radius: 999px;
    background: var(--ecm-studio-surface);
    color: var(--ecm-studio-text);
    box-shadow: none;
    font-size: 12px;
    line-height: 1.25;
}

.ecm-attachment-chip.is-uploading,
.ecm-attachment-chip[aria-busy="true"] {
    border-color: var(--ecm-studio-accent-border);
    background: var(--ecm-studio-accent-soft);
}

.ecm-attachment-chip.is-error {
    border-color: var(--ecm-studio-danger-border);
    background: var(--ecm-studio-danger-soft);
    color: var(--ecm-studio-danger);
}

.ecm-attachment-chip__icon {
    width: 18px;
    height: 18px;
    flex: 0 0 auto;
    color: var(--ecm-studio-accent-text);
}

.ecm-attachment-chip__label {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.ecm-attachment-chip__meta {
    flex: 0 0 auto;
    color: var(--ecm-studio-muted);
    font-size: 10px;
}

.ecm-attachment-chip__remove {
    width: 26px;
    height: 26px;
    flex: 0 0 26px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--ecm-studio-muted);
    cursor: pointer;
}

.ecm-attachment-chip__remove:hover {
    background: var(--ecm-studio-subtle-strong);
    color: var(--ecm-studio-danger);
}

.ecm-button:focus-visible,
.ecm-icon-button:focus-visible,
.ecm-attachment-button:focus-visible,
.ecm-attachment-chip:focus-visible,
.ecm-attachment-chip__remove:focus-visible,
.ecm-composer-shell > textarea:focus-visible,
.ecm-composer-shell > input:focus-visible,
.ecm-composer-shell .ecm-composer-input:focus-visible {
    outline: 2px solid var(--ecm-studio-accent);
    outline-offset: 2px;
    box-shadow: 0 0 0 4px var(--ecm-studio-focus);
}

.ecm-composer-shell > textarea:focus-visible,
.ecm-composer-shell > input:focus-visible,
.ecm-composer-shell .ecm-composer-input:focus-visible {
    outline: 0;
    box-shadow: none;
}

.ecm-button:disabled,
.ecm-button[aria-disabled="true"],
.ecm-button.is-disabled,
.ecm-icon-button:disabled,
.ecm-icon-button[aria-disabled="true"],
.ecm-icon-button.is-disabled,
.ecm-attachment-button:disabled,
.ecm-attachment-button[aria-disabled="true"],
.ecm-attachment-button.is-disabled,
.ecm-attachment-chip__remove:disabled,
.ecm-attachment-chip__remove[aria-disabled="true"] {
    pointer-events: none;
    cursor: not-allowed;
    opacity: .5;
    box-shadow: none;
    transform: none;
}

.ecm-button.is-loading,
.ecm-button[aria-busy="true"],
.ecm-icon-button.is-loading,
.ecm-icon-button[aria-busy="true"],
.ecm-attachment-button.is-loading,
.ecm-attachment-button[aria-busy="true"] {
    cursor: wait;
}

.ecm-button.is-loading::before,
.ecm-button[aria-busy="true"]::before,
.ecm-icon-button.is-loading::before,
.ecm-icon-button[aria-busy="true"]::before,
.ecm-attachment-button.is-loading::before,
.ecm-attachment-button[aria-busy="true"]::before {
    content: "";
    width: 14px;
    height: 14px;
    flex: 0 0 14px;
    border: 2px solid currentColor;
    border-right-color: transparent;
    border-radius: 50%;
    opacity: .82;
    animation: ecm-studio-spin .72s linear infinite;
}

.ecm-icon-button.is-loading > svg,
.ecm-icon-button[aria-busy="true"] > svg,
.ecm-attachment-button.is-loading > svg,
.ecm-attachment-button[aria-busy="true"] > svg {
    display: none;
}

.ecm-button.is-stop,
.ecm-button[data-state="stop"],
.ecm-icon-button.is-stop,
.ecm-icon-button[data-state="stop"] {
    border-color: var(--ecm-studio-danger-solid);
    background: var(--ecm-studio-danger-solid);
    color: var(--ecm-studio-on-danger);
}

.ecm-button.is-stop:hover,
.ecm-button[data-state="stop"]:hover,
.ecm-icon-button.is-stop:hover,
.ecm-icon-button[data-state="stop"]:hover {
    border-color: var(--ecm-studio-danger-solid-hover);
    background: var(--ecm-studio-danger-solid-hover);
    color: var(--ecm-studio-on-danger);
}

.ecm-button.is-stopping,
.ecm-icon-button.is-stopping {
    cursor: wait;
    opacity: .78;
}

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

@media (max-width: 640px) {
    .ecm-button {
        min-height: 44px;
        padding-inline: 16px;
    }

    .ecm-icon-button,
    .ecm-attachment-button {
        width: 44px;
        height: 44px;
        min-width: 44px;
    }

    .ecm-composer-shell {
        gap: 6px;
        padding: 7px 8px;
        border-radius: 18px;
    }

    .ecm-composer-shell > textarea,
    .ecm-composer-shell > input,
    .ecm-composer-shell .ecm-composer-input {
        min-height: 44px;
        padding-inline: 6px;
    }

    .ecm-attachment-tray {
        gap: 6px;
        padding: 7px;
        border-radius: 12px;
    }

    .ecm-attachment-chip {
        max-width: 100%;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ecm-button,
    .ecm-icon-button,
    .ecm-attachment-button,
    .ecm-composer-shell {
        transition: none;
    }

    .ecm-button.is-loading::before,
    .ecm-button[aria-busy="true"]::before,
    .ecm-icon-button.is-loading::before,
    .ecm-icon-button[aria-busy="true"]::before,
    .ecm-attachment-button.is-loading::before,
    .ecm-attachment-button[aria-busy="true"]::before {
        animation-duration: 1.4s;
    }
}