/* ==========================================================================
   sprite.novice.tw — 工具頁專屬樣式
   ==========================================================================
   載入順序：theme-dark.css 之後。只放本站工具介面專屬的元件，
   通用元件（card / btn / badge / tools-grid）一律沿用 theme-dark.css。
   ========================================================================== */

/* ── 上傳區 ─────────────────────────────────────────────── */
.drop-zone {
    border: 2px dashed var(--border-strong);
    border-radius: 12px;
    padding: 2.5rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: border-color .18s ease, background-color .18s ease;
    background: var(--bg-subtle, rgba(255,255,255,.02));
}
.drop-zone:hover,
.drop-zone:focus-visible {
    border-color: #6ea8fe;
    outline: none;
}
.drop-zone.is-dragover {
    border-color: #6ea8fe;
    background: rgba(110, 168, 254, .08);
}
.drop-zone__icon { font-size: 2.25rem; color: var(--text-tertiary); margin-bottom: .75rem; }
.drop-zone__title { font-size: 1.05rem; font-weight: 600; color: var(--text-primary); margin-bottom: .35rem; }
.drop-zone__hint { font-size: .82rem; color: var(--text-tertiary); margin: 0; }

/* ── 影片資訊列 ──────────────────────────────────────────── */
.clip-info {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: .9rem 1rem;
    border: 1px solid var(--border);
    border-radius: 10px;
    background: var(--bg-subtle, rgba(255,255,255,.02));
}
.clip-info__item { min-width: 0; }
.clip-info__label {
    display: block;
    font-size: .72rem;
    letter-spacing: .04em;
    color: var(--text-tertiary);
    text-transform: uppercase;
    margin-bottom: .15rem;
}
.clip-info__value {
    font-size: .95rem;
    font-weight: 600;
    color: var(--text-primary);
    font-variant-numeric: tabular-nums;
    word-break: break-all;
}

/* ── 設定面板 ────────────────────────────────────────────── */
.setting-row { margin-bottom: 1.1rem; }
.setting-row:last-child { margin-bottom: 0; }
.setting-label {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    font-size: .875rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: .4rem;
}
.setting-label__value {
    font-size: .82rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
    font-weight: 600;
}
.setting-help { font-size: .78rem; color: var(--text-tertiary); margin: .35rem 0 0; }

/* 讓 range 在深色底看得清楚 */
.form-control-range { width: 100%; }

/* ── 即時預覽 ────────────────────────────────────────────── */
.preview-stage {
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: .75rem;
    background:
        /* 棋盤格背景，讓透明區域看得出來 */
        linear-gradient(45deg, rgba(128,128,128,.12) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(128,128,128,.12) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(128,128,128,.12) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(128,128,128,.12) 75%);
    background-size: 16px 16px;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    overflow: auto;
    max-height: 60vh;
    text-align: center;
}
.preview-stage img,
.preview-stage canvas {
    max-width: 100%;
    height: auto;
    image-rendering: pixelated; /* 精靈圖縮放時保持銳利，避免模糊 */
}

/* ── 進度條 ──────────────────────────────────────────────── */
.progress-wrap { margin-top: 1rem; }
.progress {
    height: 6px;
    border-radius: 3px;
    background-color: var(--bg-hover);
    overflow: hidden;
}
.progress-bar {
    background-color: #6ea8fe;
    transition: width .2s ease;
}
.progress-text {
    font-size: .8rem;
    color: var(--text-secondary);
    margin-top: .4rem;
    text-align: center;
}

/* ── 訊息方塊 ────────────────────────────────────────────── */
.msg {
    border-radius: 8px;
    padding: .8rem 1rem;
    font-size: .875rem;
    line-height: 1.6;
    margin-top: 1rem;
    border: 1px solid transparent;
}
.msg-error { background: var(--err-bg); border-color: #fecaca; color: #991b1b; }
.msg-ok    { background: var(--ok-bg);  border-color: #bbf7d0; color: #166534; }
.msg-info  { background: var(--warn-bg); border-color: #fde68a; color: #92400e; }
.msg i { margin-right: .4rem; }

/* ── 隱藏原生 file input ─────────────────────────────────── */
.visually-hidden-file {
    position: absolute;
    width: 1px; height: 1px;
    padding: 0; margin: -1px;
    overflow: hidden;
    clip: rect(0 0 0 0);
    white-space: nowrap;
    border: 0;
}

/* ── 步驟提示（教學頁共用） ─────────────────────────────── */
.steps { counter-reset: step; list-style: none; padding-left: 0; margin: 0; }
.steps > li {
    position: relative;
    padding-left: 2.6rem;
    padding-bottom: 1.4rem;
}
.steps > li::before {
    counter-increment: step;
    content: counter(step);
    position: absolute;
    left: 0; top: 0;
    width: 1.8rem; height: 1.8rem;
    border-radius: 50%;
    background: var(--bg-hover);
    border: 1px solid var(--border-strong);
    color: var(--text-primary);
    font-size: .85rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    justify-content: center;
}
.steps > li:not(:last-child)::after {
    content: '';
    position: absolute;
    left: .9rem;
    top: 2rem;
    bottom: 0;
    width: 1px;
    background: var(--border);
}
.steps > li h3 { font-size: 1rem; font-weight: 600; margin-bottom: .3rem; color: var(--text-primary); }
.steps > li p { font-size: .9rem; color: var(--text-secondary); margin: 0; }

/* ── 序列圖格狀顯示 ─────────────────────────────────────── */
.frame-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(110px, 1fr));
    gap: .6rem;
}
.frame-item {
    position: relative;
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    background: var(--bg-subtle, rgba(255,255,255,.02));
}
.frame-item canvas {
    display: block;
    width: 100%;
    height: auto;
    background:
        linear-gradient(45deg, rgba(128,128,128,.12) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(128,128,128,.12) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(128,128,128,.12) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(128,128,128,.12) 75%);
    background-size: 12px 12px;
    background-position: 0 0, 0 6px, 6px -6px, -6px 0;
}
.frame-item__label {
    position: absolute;
    left: .35rem; bottom: .35rem;
    font-size: .68rem;
    color: #fff;
    background: rgba(0,0,0,.6);
    padding: .05rem .3rem;
    border-radius: 3px;
    font-variant-numeric: tabular-nums;
}
.frame-item__btn {
    position: absolute;
    right: .35rem; top: .35rem;
    width: 1.7rem; height: 1.7rem;
    border: 0;
    border-radius: 50%;
    background: rgba(0,0,0,.6);
    color: #fff;
    cursor: pointer;
    font-size: .72rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background-color .15s ease;
}
.frame-item__btn:hover { background: rgba(0,0,0,.85); }

@media (max-width: 575px) {
    .drop-zone { padding: 1.75rem 1rem; }
    .clip-info { gap: 1rem; }
}