/* ==========================================
   比較頁 + AI 流程加強(返回鍵 / 預算拉桿 / 置中)
   ========================================== */

/* ---------- AI 步驟:返回上一步 ---------- */
.ai-back-btn {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    margin-bottom: 12px;
    padding: 8px 14px;
    min-height: 40px;
    border: 1px solid rgba(31, 143, 138, 0.24);
    border-radius: 999px;
    background: rgba(31, 143, 138, 0.08);
    color: var(--accent);
    font-weight: 800;
    font-size: 13px;
    cursor: pointer;
    transition: transform 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

.ai-back-btn:hover {
    transform: translateX(-2px);
    background: rgba(31, 143, 138, 0.16);
    border-color: var(--accent);
}

.ai-back-btn.is-hidden { display: none; }

/* ---------- AI 步驟內容置中 ---------- */
#ai-modal .ai-step { max-width: 720px; margin: 0 auto; }
#ai-modal .conversation-final-summary { text-align: center; }
#ai-modal .usage-group-label { text-align: center; }
#ai-modal .usage-groups .ai-usage-list {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
}
#ai-modal .usage-groups .btn-opt {
    align-items: center;
    text-align: center;
    width: auto;
    flex: 0 1 210px;
    min-width: 160px;
    margin-bottom: 0;
}
#ai-modal .case-style-option { text-align: center; }
#ai-modal .case-style-option b, #ai-modal .case-style-option span { text-align: center; }
#ai-modal .conversation-option { text-align: center; }
#ai-modal .monitor-need-row { justify-content: center; }
#ai-modal .ai-decision-options .conversation-option b,
#ai-modal .ai-decision-options .conversation-option span { text-align: center; }

#ai-modal .usage-group {
    --usage-color: var(--accent);
    --usage-color-2: var(--accent-4);
    --usage-tint: rgba(31, 143, 138, 0.08);
    padding: 12px;
    border: 1px solid color-mix(in srgb, var(--usage-color) 34%, var(--border));
    border-left: 5px solid var(--usage-color);
    border-radius: 8px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--usage-color) 14%, transparent), transparent 58%),
        var(--usage-tint);
}

#ai-modal .usage-group-game {
    --usage-color: #2b82d4;
    --usage-color-2: #7c5cff;
    --usage-tint: rgba(43, 130, 212, 0.08);
}

#ai-modal .usage-group-work {
    --usage-color: #1f8f8a;
    --usage-color-2: #24c6b8;
    --usage-tint: rgba(31, 143, 138, 0.09);
}

#ai-modal .usage-group-ai {
    --usage-color: #e9573f;
    --usage-color-2: #f0a231;
    --usage-tint: rgba(233, 87, 63, 0.08);
}

#ai-modal .usage-group-label {
    color: var(--usage-color);
    margin-bottom: 10px;
}

#ai-modal .usage-groups .usage-group .btn-opt {
    border-color: color-mix(in srgb, var(--usage-color) 28%, var(--border));
}

#ai-modal .usage-groups .usage-group .btn-opt:hover,
#ai-modal .usage-groups .usage-group .btn-opt.is-selected {
    border-color: var(--usage-color);
    box-shadow: 0 12px 24px color-mix(in srgb, var(--usage-color) 18%, transparent);
}

#ai-modal .usage-groups .usage-group .btn-opt.is-selected {
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--usage-color) 18%, transparent), transparent 62%),
        var(--bg-container);
}

#ai-modal .usage-group-work .ai-usage-list {
    display: grid;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    justify-content: stretch;
}

#ai-modal .usage-group-work .btn-opt {
    width: 100%;
    min-width: 0;
    flex: none;
}

#ai-modal .monitor-need-row {
    position: relative;
    margin-top: 20px;
    border: 2px solid color-mix(in srgb, var(--accent-2) 42%, var(--border));
    border-radius: 8px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 54%),
        linear-gradient(270deg, color-mix(in srgb, var(--accent) 14%, transparent), transparent 48%),
        var(--bg-container);
    box-shadow: 0 16px 34px rgba(31, 143, 138, 0.14);
}

#ai-modal .monitor-need-row > span {
    color: var(--text-main);
    font-size: 1rem;
    font-weight: 900;
}

#ai-modal .monitor-need-options {
    padding: 4px;
    border-radius: 8px;
    background: color-mix(in srgb, var(--accent) 8%, var(--soft-bg));
}

#ai-modal .monitor-need-btn {
    border: 1.5px solid transparent;
    background: transparent;
}

#ai-modal .monitor-need-btn.is-selected {
    color: #fff;
    border-color: transparent;
    background: linear-gradient(135deg, var(--accent), var(--accent-4));
    box-shadow: 0 10px 22px rgba(31, 143, 138, 0.24);
}

.device-tab[data-device-tab="monitor"] {
    border-color: color-mix(in srgb, var(--accent) 34%, var(--border));
}

.device-tab[data-device-tab="monitor"].active {
    background: linear-gradient(135deg, #2b82d4, #24c6b8);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 12px 26px rgba(36, 198, 184, 0.22);
}

.monitor-size-guide {
    border-left: 5px solid var(--accent);
    box-shadow: 0 14px 30px rgba(31, 143, 138, 0.12);
}

.btn-add-monitor {
    background: linear-gradient(135deg, var(--accent), var(--accent-4));
    color: #fff;
    border-color: transparent;
    box-shadow: 0 10px 22px rgba(31, 143, 138, 0.18);
}

.compare-nav-btn {
    border-color: color-mix(in srgb, var(--accent-2) 42%, transparent);
}

.compare-nav-btn.active,
.compare-nav-btn:hover {
    background: linear-gradient(135deg, var(--accent-2), #f0a231);
    color: #fff;
    border-color: transparent;
}

.compare-empty-state {
    display: grid;
    gap: 14px;
    justify-items: start;
    padding: 28px;
    border: 1px solid var(--border);
    border-left: 5px solid var(--accent-2);
    border-radius: 8px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--accent-2) 12%, transparent), transparent 56%),
        var(--bg-container);
}

.compare-empty-state h2 {
    margin: 0;
    font-size: 22px;
}

.compare-empty-state p {
    max-width: 680px;
    margin: 0;
    color: var(--text-muted);
    line-height: 1.7;
}

.manual-compare-shell {
    width: 100%;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
    align-items: stretch;
    margin: 4px 0 18px;
}

.manual-compare-controls {
    width: 100%;
    display: flex;
    justify-content: flex-end;
    margin: 0 0 10px;
}

.manual-compare-clear {
    min-height: 40px;
    border-color: color-mix(in srgb, var(--accent-2) 36%, var(--border));
}

.manual-compare-slot {
    min-height: 168px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 18px;
    border: 2px dashed color-mix(in srgb, var(--accent) 36%, var(--border));
    border-radius: 8px;
    background:
        linear-gradient(135deg, color-mix(in srgb, var(--accent) 10%, transparent), transparent 60%),
        var(--bg-container);
    color: var(--text-main);
    text-align: center;
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.manual-compare-slot:hover,
.manual-compare-slot.has-machine {
    border-style: solid;
    border-color: var(--accent);
    box-shadow: 0 16px 34px rgba(31, 143, 138, 0.14);
}

.manual-compare-slot:hover { transform: translateY(-2px); }

.manual-compare-slot.has-machine {
    align-items: flex-start;
    justify-content: flex-start;
    text-align: left;
}

.manual-compare-slot b {
    max-width: 100%;
    font-size: 17px;
    line-height: 1.45;
}

.manual-compare-slot small {
    color: var(--text-muted);
    line-height: 1.55;
}

.manual-compare-options {
    width: 100%;
    display: grid;
    gap: 12px;
    margin-top: -4px;
    padding: 16px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--header-bg);
}

.manual-compare-options-head h3 {
    margin: 4px 0 0;
    font-size: 18px;
}

.manual-compare-device-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 10px;
    max-height: 420px;
    overflow: auto;
    padding-right: 4px;
}

.manual-compare-device {
    display: grid;
    gap: 5px;
    padding: 13px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-container);
    color: var(--text-main);
    text-align: left;
    cursor: pointer;
    transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.manual-compare-device:hover {
    transform: translateY(-2px);
    border-color: var(--accent);
    box-shadow: 0 12px 26px rgba(31, 143, 138, 0.14);
}

.manual-compare-device span {
    width: fit-content;
    padding: 3px 8px;
    border-radius: 999px;
    background: color-mix(in srgb, var(--accent) 12%, transparent);
    color: var(--accent);
    font-size: 12px;
    font-weight: 900;
}

.manual-compare-device b {
    line-height: 1.45;
}

.manual-compare-device small {
    color: var(--text-muted);
    line-height: 1.45;
}

.manual-compare-device em {
    color: var(--accent-2);
    font-style: normal;
    font-weight: 900;
}

/* ---------- 預算拉桿 ---------- */
.budget-slider-shell {
    max-width: 560px;
    margin: 6px auto 16px;
    text-align: center;
}

#ai-budget {
    --budget-progress: 12%;
    width: 100%;
    height: 14px;
    appearance: none;
    -webkit-appearance: none;
    border-radius: 999px;
    border: 1px solid var(--border);
    background:
        linear-gradient(90deg, var(--accent), var(--accent-4) 55%, var(--accent-2)) 0 / var(--budget-progress) 100% no-repeat,
        var(--soft-bg, rgba(127, 127, 127, 0.14));
    cursor: pointer;
    outline-offset: 4px;
}

#ai-budget::-webkit-slider-thumb {
    appearance: none;
    -webkit-appearance: none;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    background:
        radial-gradient(circle at 32% 30%, rgba(255,255,255,0.85), rgba(255,255,255,0) 42%),
        linear-gradient(135deg, var(--accent), var(--accent-4));
    box-shadow: 0 4px 14px rgba(31, 143, 138, 0.4);
    cursor: grab;
    transition: transform 0.15s ease;
}

#ai-budget::-webkit-slider-thumb:hover { transform: scale(1.12); }
#ai-budget::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.18); }

#ai-budget::-moz-range-thumb {
    width: 28px;
    height: 28px;
    border-radius: 50%;
    border: 3px solid var(--accent);
    background: linear-gradient(135deg, var(--accent), var(--accent-4));
    box-shadow: 0 4px 14px rgba(31, 143, 138, 0.4);
    cursor: grab;
}

.budget-scale {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    color: var(--text-muted);
    font-size: 11px;
    font-weight: 700;
    letter-spacing: 0.02em;
}

.budget-tier {
    display: inline-block;
    margin-top: 8px;
    padding: 8px 16px;
    border-radius: 999px;
    border: 1px solid rgba(124, 92, 255, 0.26);
    background:
        linear-gradient(90deg, rgba(31, 143, 138, 0.1), rgba(124, 92, 255, 0.12)),
        var(--bg-container);
    font-size: 13px;
    font-weight: 800;
    color: var(--text-main);
}

/* ---------- 入口更醒目 ---------- */
@keyframes ai-cta-pulse {
    0%, 100% {
        box-shadow:
            0 18px 42px rgba(31, 143, 138, 0.24),
            0 0 0 5px rgba(124, 92, 255, 0.1);
    }
    50% {
        box-shadow:
            0 20px 48px rgba(31, 143, 138, 0.34),
            0 0 0 11px rgba(124, 92, 255, 0.18);
    }
}

.hero-ai-cta { animation: ai-cta-pulse 2.6s ease-in-out infinite; }

.ai-btn-nav { position: relative; }
.ai-btn-nav::after {
    content: "";
    position: absolute;
    top: -3px;
    right: -3px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--accent-3);
    box-shadow: 0 0 0 0 rgba(214, 155, 31, 0.6);
    animation: ai-cta-pulse-dot 2.2s ease-out infinite;
}

@keyframes ai-cta-pulse-dot {
    0% { box-shadow: 0 0 0 0 rgba(214, 155, 31, 0.55); }
    70% { box-shadow: 0 0 0 8px rgba(214, 155, 31, 0); }
    100% { box-shadow: 0 0 0 0 rgba(214, 155, 31, 0); }
}

@media (prefers-reduced-motion: reduce) {
    .hero-ai-cta, .ai-btn-nav::after { animation: none; }
}

/* ---------- 結果卡片上的比較按鈕 ---------- */
.compare-launch-btn {
    margin-top: 8px;
    padding: 10px;
    min-height: 42px;
    border: 1px dashed rgba(124, 92, 255, 0.4);
    border-radius: 8px;
    background: rgba(124, 92, 255, 0.07);
    color: var(--text-main);
    font-weight: 800;
    cursor: pointer;
    transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.compare-launch-btn:hover {
    background: rgba(124, 92, 255, 0.14);
    border-color: var(--accent-4);
    transform: translateY(-1px);
}

/* ---------- 比較頁 ---------- */
.compare-container { max-width: 1080px; }

.compare-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 14px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.compare-heading h1 { margin: 2px 0 0; }

.compare-mode-toggle {
    display: inline-flex;
    gap: 4px;
    padding: 4px;
    border: 1px solid var(--border);
    border-radius: 999px;
    background: var(--bg-container);
}

.compare-mode-btn {
    padding: 9px 16px;
    min-height: 42px;
    border: none;
    border-radius: 999px;
    background: transparent;
    color: var(--text-muted);
    font-weight: 800;
    cursor: pointer;
    transition: background 0.18s ease, color 0.18s ease;
}

.compare-mode-btn.active {
    background: linear-gradient(135deg, var(--accent), var(--accent-4));
    color: white;
}

.compare-rival-picker {
    display: flex;
    align-items: flex-start;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 16px;
    color: var(--text-muted);
    font-size: 13px;
    font-weight: 800;
}

.compare-rival-picker > span { padding-top: 10px; }

.compare-rival-chips { display: flex; gap: 8px; flex-wrap: wrap; }

.compare-rival-chip {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 2px;
    padding: 8px 12px;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-container);
    color: var(--text-main);
    font-weight: 800;
    font-size: 13px;
    cursor: pointer;
    transition: border-color 0.18s ease, background 0.18s ease;
}

.compare-rival-chip small { color: var(--text-muted); font-weight: 600; }

.compare-rival-chip:hover { border-color: var(--accent); }

.compare-rival-chip.active {
    border-color: var(--accent-4);
    background: rgba(124, 92, 255, 0.1);
    box-shadow: 0 0 0 3px rgba(124, 92, 255, 0.12);
}

.compare-duel {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 14px;
    align-items: stretch;
    margin-bottom: 18px;
}

.compare-vs {
    align-self: center;
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--accent), var(--accent-2));
    color: white;
    font-weight: 950;
    font-size: 17px;
    box-shadow: 0 8px 22px rgba(233, 95, 70, 0.3);
}

.compare-machine-card {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-container);
    padding: 18px;
    box-shadow: var(--shadow-card);
}

.compare-machine-card.compare-base { border-top: 4px solid var(--accent); }
.compare-machine-card.compare-rival { border-top: 4px solid var(--accent-2); }

.compare-machine-type {
    font-size: 12px;
    font-weight: 900;
    letter-spacing: 0.04em;
    color: var(--accent);
}

.compare-machine-card.compare-rival .compare-machine-type { color: var(--accent-2); }

.compare-machine-card h3 { margin: 6px 0 8px; line-height: 1.4; font-size: 17px; }

.compare-machine-price {
    font-size: 24px;
    font-weight: 900;
    color: var(--accent);
    margin-bottom: 10px;
}

.compare-machine-card.compare-rival .compare-machine-price { color: var(--accent-2); }

.compare-machine-specs {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 6px;
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.5;
}

.compare-verdict {
    border: 1px solid rgba(31, 143, 138, 0.22);
    border-radius: 8px;
    background:
        linear-gradient(90deg, rgba(31, 143, 138, 0.1), rgba(124, 92, 255, 0.08)),
        var(--bg-container);
    padding: 16px 18px;
    margin-bottom: 18px;
}

.compare-verdict b { display: block; margin-bottom: 8px; }
.compare-verdict p { margin: 0 0 6px; color: var(--text-muted); line-height: 1.7; }
.compare-verdict p:last-child { margin-bottom: 0; }

.compare-metrics { display: grid; gap: 14px; margin-bottom: 18px; }

.compare-metric-row {
    border: 1px solid var(--border);
    border-radius: 8px;
    background: var(--bg-container);
    padding: 14px 16px;
}

.compare-metric-head {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 10px;
}

.compare-metric-head small { color: var(--text-muted); font-weight: 800; }

.compare-metric-bars { display: grid; gap: 8px; }

.compare-bar-line {
    display: grid;
    grid-template-columns: minmax(90px, 180px) 1fr;
    align-items: center;
    gap: 10px;
}

.compare-bar-name {
    font-size: 12px;
    font-weight: 700;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.compare-bar-track {
    height: 12px;
    border-radius: 999px;
    background: var(--soft-bg, rgba(127, 127, 127, 0.14));
    border: 1px solid var(--border);
    overflow: hidden;
}

.compare-bar {
    display: block;
    height: 100%;
    border-radius: 999px;
    opacity: 0.6;
    transition: width 0.4s ease;
}

.compare-bar.base { background: linear-gradient(90deg, var(--accent), var(--accent-4)); }
.compare-bar.rival { background: linear-gradient(90deg, var(--accent-2), var(--accent-3)); }
.compare-bar.lead { opacity: 1; }

.compare-metric-plain {
    margin: 10px 0 0;
    color: var(--text-muted);
    font-size: 13px;
    line-height: 1.7;
}

.compare-spec-table-wrap { overflow-x: auto; }

.compare-spec-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-container);
    border: 1px solid var(--border);
    border-radius: 8px;
    overflow: hidden;
    font-size: 13px;
}

.compare-spec-table th,
.compare-spec-table td {
    padding: 10px 14px;
    text-align: left;
    border-bottom: 1px solid var(--border);
    vertical-align: top;
}

.compare-spec-table th { background: var(--header-bg); font-weight: 900; }
.compare-spec-table td:first-child { color: var(--text-muted); font-weight: 800; white-space: nowrap; }
.compare-spec-table tr:last-child td { border-bottom: none; }

/* ---------- 手機版 ---------- */
@media (max-width: 820px) {
    .navbar {
        height: auto;
        flex-wrap: wrap;
        row-gap: 8px;
        padding: 10px 12px;
    }

    .nav-links {
        display: grid;
        grid-auto-flow: column;
        grid-auto-columns: max-content;
        grid-template-columns: none;
        width: 100%;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        padding-bottom: 2px;
    }

    body { padding-top: 132px; }

    .nav-btn { white-space: nowrap; flex: 0 0 auto; }
}

@media (max-width: 700px) {
    #ai-modal .usage-group-work .ai-usage-list { grid-template-columns: repeat(2, minmax(0, 1fr)); }

    .compare-header { justify-content: center; text-align: center; }
    .compare-heading { width: 100%; order: -1; }
    .compare-mode-toggle { width: 100%; justify-content: center; }
    .compare-mode-btn { flex: 1; }

    .compare-duel { grid-template-columns: 1fr; }
    .compare-vs { justify-self: center; width: 44px; height: 44px; font-size: 14px; }

    .compare-bar-line { grid-template-columns: 1fr; gap: 4px; }
    .compare-rival-picker > span { padding-top: 0; width: 100%; }
    .compare-rival-chip { width: 100%; }

    .level-options { grid-template-columns: 1fr; }

    .compare-empty-state { justify-items: stretch; padding: 20px; }
    .manual-compare-shell {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    .manual-compare-controls { justify-content: stretch; }
    .manual-compare-clear { width: 100%; }
    .manual-compare-device-grid { grid-template-columns: 1fr; }

    .ai-back-btn { min-height: 44px; }
    .budget-scale span:nth-child(even) { display: none; }
}

@media (max-width: 460px) {
    #ai-modal .usage-group-work .ai-usage-list { grid-template-columns: 1fr; }
}