/* ============================================================================
 * Mira 觅画 · Buttons v1 (印社案头 — 朱砂印章 + 古铜金硬阴影)
 *
 * 4 种语义：
 *   primary    朱砂实底 + 古铜金硬阴影 (主 CTA)
 *   secondary  线框朱砂 (次级动作)
 *   ghost      无边纯文 (link / 取消 / cancel)
 *   danger     朱砂深 (危险动作: 删除 / 停止)
 *
 * 3 种 size：
 *   sm  高 28px / padding 4×12 / font 12
 *   md  高 36px / padding 8×16 / font 13   (default)
 *   lg  高 44px / padding 12×24 / font 14  (touch target ≥44pt)
 *
 * state：default / hover / active / disabled / loading
 *
 * 兼容：保留所有旧 class 名 (btn-primary / btn-secondary / btn-large /
 *      btn-sm / btn-generate / btn-auto / btn-stop / btn-icon / btn-link /
 *      btn-test / btn-cancel / btn-confirm / dist-publish-btn / dist-ai-title)
 *      重新映射到新规范。
 *
 * 必须在 tokens.css 之后加载。
 * ============================================================================ */

/* ----------------------------------------------------------------------------
 * Base — 所有按钮的共同基础
 * ---------------------------------------------------------------------------- */
.btn,
button.primary,
button[type="submit"] {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: 0 var(--space-4);
    height: 36px;                 /* default: md */
    min-width: 64px;
    border: 1px solid transparent;
    border-radius: 4px;            /* 印社直角感 */
    font-family: var(--font-display);
    font-size: var(--text-sm);
    font-weight: 500;
    line-height: 1;
    letter-spacing: 0.04em;
    cursor: pointer;
    white-space: nowrap;
    user-select: none;
    transition: background var(--motion-fast) var(--ease-out),
                border-color var(--motion-fast) var(--ease-out),
                box-shadow var(--motion-fast) var(--ease-out),
                transform var(--motion-fast) var(--ease-out),
                color var(--motion-fast) var(--ease-out);
    position: relative;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
}
.btn:focus-visible,
button.primary:focus-visible {
    outline: none;
    box-shadow: var(--shadow-ring);
}
.btn:disabled,
button.primary:disabled {
    opacity: .45;
    cursor: not-allowed;
    transform: none !important;
    box-shadow: none !important;
}

/* ----------------------------------------------------------------------------
 * Variant — primary (朱砂实底 + 古铜金硬阴影 hover)
 * ---------------------------------------------------------------------------- */
.btn-primary,
.btn-confirm,
.btn-create,
.dist-publish-btn,
button.primary,
button[type="submit"] {
    background: var(--btn-primary-bg) !important;
    color: var(--btn-primary-fg) !important;
    border: 1px solid var(--btn-primary-bg) !important;
}
.btn-primary:hover:not(:disabled),
.btn-confirm:hover:not(:disabled),
.btn-create:hover:not(:disabled),
.dist-publish-btn:hover:not(:disabled),
button.primary:hover:not(:disabled),
button[type="submit"]:hover:not(:disabled) {
    background: var(--btn-primary-hover) !important;
    border-color: var(--btn-primary-hover) !important;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--gold-500);
}
.btn-primary:active:not(:disabled),
.btn-confirm:active:not(:disabled),
.btn-create:active:not(:disabled),
.dist-publish-btn:active:not(:disabled),
button.primary:active:not(:disabled),
button[type="submit"]:active:not(:disabled) {
    background: var(--btn-primary-press) !important;
    transform: translate(0, 0);
    box-shadow: none;
}

/* ----------------------------------------------------------------------------
 * Variant — secondary (线框朱砂)
 * ---------------------------------------------------------------------------- */
.btn-secondary,
.btn-test,
.btn-regen,
.ad-add-btn {
    background: var(--btn-secondary-bg) !important;
    color: var(--btn-secondary-fg) !important;
    border: 1px solid var(--btn-secondary-bd) !important;
}
.btn-secondary:hover:not(:disabled),
.btn-test:hover:not(:disabled),
.btn-regen:hover:not(:disabled),
.ad-add-btn:hover:not(:disabled) {
    background: var(--btn-secondary-hover-bg) !important;
    border-color: var(--accent-base) !important;
    color: var(--accent-hover) !important;
}

/* ----------------------------------------------------------------------------
 * Variant — ghost (link / cancel / 弱化动作)
 * ---------------------------------------------------------------------------- */
.btn-link,
.btn-cancel,
.dist-ai-title {
    background: var(--btn-ghost-bg) !important;
    color: var(--btn-ghost-fg) !important;
    border: 1px solid transparent !important;
    padding: 0 var(--space-3);
    height: 32px;
    min-width: 0;
    font-weight: 400;
    letter-spacing: 0;
}
.btn-link:hover:not(:disabled),
.btn-cancel:hover:not(:disabled),
.dist-ai-title:hover:not(:disabled) {
    background: var(--btn-ghost-hover-bg) !important;
    color: var(--text-primary) !important;
}

/* link 风格 — 文字下划线扫过 */
.btn-link {
    color: var(--accent-base) !important;
    background: transparent !important;
    text-decoration: none;
    position: relative;
}
.btn-link::after {
    content: "";
    position: absolute;
    bottom: 6px;
    left: var(--space-3);
    right: var(--space-3);
    height: 1px;
    background: currentColor;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform var(--motion-base) var(--ease-out);
}
.btn-link:hover::after {
    transform: scaleX(1);
}

/* ----------------------------------------------------------------------------
 * Variant — danger (停止 / 删除 / 危险)
 * ---------------------------------------------------------------------------- */
.btn-stop,
.btn-danger {
    background: var(--btn-danger-bg) !important;
    color: var(--btn-danger-fg) !important;
    border: 1px solid var(--btn-danger-bg) !important;
}
.btn-stop:hover:not(:disabled),
.btn-danger:hover:not(:disabled) {
    background: var(--seal-700) !important;
    border-color: var(--seal-700) !important;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--ink-700);
}
.btn-stop:active:not(:disabled),
.btn-danger:active:not(:disabled) {
    transform: translate(0, 0);
    box-shadow: none;
}

/* ----------------------------------------------------------------------------
 * Size — sm / md (default) / lg
 * ---------------------------------------------------------------------------- */
.btn-sm {
    height: 28px;
    padding: 0 var(--space-3);
    font-size: var(--text-xs);
    min-width: 56px;
}
.btn-large,
.btn-lg {
    height: 44px;
    padding: 0 var(--space-5);
    font-size: var(--text-md);
    min-width: 96px;
}

/* ----------------------------------------------------------------------------
 * Variant — generate (主生成按钮，全宽 + 大尺寸)
 * 等价于 btn-primary btn-lg + width 100%
 * ---------------------------------------------------------------------------- */
.btn-generate {
    background: var(--btn-primary-bg) !important;
    color: var(--btn-primary-fg) !important;
    border: 1px solid var(--btn-primary-bg) !important;
    width: 100%;
    min-height: 56px;
    padding: var(--space-2) var(--space-5);
    font-size: var(--text-md);
    font-weight: 600;
    letter-spacing: 0.06em;
    border-radius: 4px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2px;
    line-height: 1.2;
}
.btn-generate .btn-generate-title {
    font-size: var(--text-md);
    font-weight: 600;
    letter-spacing: 0.08em;
}
.btn-generate .btn-generate-sub {
    font-size: 11px;
    font-weight: 400;
    letter-spacing: 0.02em;
    opacity: 0.85;
    line-height: 1.3;
    font-family: var(--font-body);
}
.btn-generate:hover:not(:disabled) {
    background: var(--btn-primary-hover) !important;
    border-color: var(--btn-primary-hover) !important;
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--gold-500);
}
.btn-generate:active:not(:disabled) {
    background: var(--btn-primary-press) !important;
    transform: translate(0, 0);
    box-shadow: none;
}

/* 5/11 余额不足态：暗灰底 + 朱砂边 + 文字偏弱（仍可点 → 跳充值页） */
.btn-generate.insufficient {
    background: var(--paper-300) !important;
    border-color: var(--seal-500) !important;
    color: var(--seal-700) !important;
}
.btn-generate.insufficient:hover:not(:disabled) {
    background: var(--seal-500) !important;
    border-color: var(--seal-500) !important;
    color: var(--paper-50) !important;
    box-shadow: 4px 4px 0 var(--ink-700);
}
.btn-generate.insufficient .btn-generate-title { color: inherit; }
.btn-generate.insufficient .btn-generate-sub { color: inherit; opacity: 0.75; }

/* generate.btn-auto — secondary 全宽 */
.btn-generate.btn-auto {
    background: var(--btn-secondary-bg) !important;
    color: var(--btn-secondary-fg) !important;
    border: 1px solid var(--btn-secondary-bd) !important;
}
.btn-generate.btn-auto:hover:not(:disabled) {
    background: var(--btn-secondary-hover-bg) !important;
    border-color: var(--accent-base) !important;
    box-shadow: 4px 4px 0 var(--gold-500);
}

/* generate.btn-stop — danger 全宽 */
.btn-generate.btn-stop {
    background: var(--btn-danger-bg) !important;
    color: var(--btn-danger-fg) !important;
    border: 1px solid var(--btn-danger-bg) !important;
}

/* loading — 朱砂转圈：支持 .btn-generate / .btn / 任何按钮 */
.btn-generate.loading,
.btn.btn-loading,
button.btn-loading {
    color: transparent !important;
    cursor: wait !important;
    position: relative;
    pointer-events: none;
}
.btn-generate.loading::after,
.btn.btn-loading::after,
button.btn-loading::after {
    content: "";
    position: absolute;
    top: 50%;
    left: 50%;
    width: 18px;
    height: 18px;
    margin: -9px 0 0 -9px;
    border: 2px solid rgba(255,255,255,.4);
    border-top-color: #fff;
    border-radius: 50%;
    animation: btn-spin .7s linear infinite;
}
/* 浅底按钮 (btn-secondary / btn-ghost) 用深色 spinner */
.btn-secondary.btn-loading::after,
.btn-ghost.btn-loading::after {
    border: 2px solid rgba(0,0,0,.15);
    border-top-color: var(--accent-base, #c7321a);
}
@keyframes btn-spin {
    to { transform: rotate(360deg); }
}

/* ----------------------------------------------------------------------------
 * Variant — icon (仅图标 / 圆形 / 36×36)
 * ---------------------------------------------------------------------------- */
.btn-icon {
    width: 36px;
    height: 36px;
    min-width: 36px;
    padding: 0;
    border-radius: 50%;
    background: transparent;
    color: var(--text-secondary);
    border: 1px solid var(--border-subtle);
}
.btn-icon:hover:not(:disabled) {
    background: var(--surface-raised);
    color: var(--accent-base);
    border-color: var(--accent-line);
}

/* ----------------------------------------------------------------------------
 * Variant — download / regen (作品库内联小动作)
 * ---------------------------------------------------------------------------- */
.btn-download {
    background: var(--btn-secondary-bg) !important;
    color: var(--btn-secondary-fg) !important;
    border: 1px solid var(--btn-secondary-bd) !important;
    height: 32px;
    padding: 0 var(--space-3);
    font-size: var(--text-xs);
    border-radius: 4px;
}
.btn-download:hover:not(:disabled) {
    background: var(--btn-secondary-hover-bg) !important;
    border-color: var(--accent-base) !important;
}

/* ----------------------------------------------------------------------------
 * 兼容补丁 — confirm/cancel 老对的 padding 更紧凑
 * ---------------------------------------------------------------------------- */
.btn-confirm,
.btn-cancel {
    height: 36px;
    padding: 0 var(--space-5);
    font-size: var(--text-md);
    border-radius: 4px;
}