/* 方案與帳務（/billing）專屬樣式。命名空間 .billing，不影響其他後台頁。 */
.billing { --b-ink: #1c2233; --b-muted: #6b7280; --b-line: #e6e8ef; --b-soft: #f6f7fb; --b-card: #ffffff;
  --b-accent: var(--primary, #727cf5); --b-accent-dark: var(--primary-dark, #5a63d8); --b-accent-50: var(--primary-50, #f5f3ff);
  --b-success: #16a34a; --b-warning: #d97706; --b-danger: #dc2626; --b-info: #2563eb; --b-radius: 16px; color: var(--b-ink); }
.billing a { color: var(--b-accent-dark); }

/* 頁首 */
.billing-head { display: flex; align-items: flex-end; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin: 4px 0 20px; }
.billing-head__eyebrow { font-size: 11px; letter-spacing: .18em; color: var(--b-muted); text-transform: uppercase; }
.billing-head__title { font-size: 26px; font-weight: 700; margin: 2px 0 0; letter-spacing: -.01em; }
.billing-head__sub { color: var(--b-muted); margin: 4px 0 0; font-size: 14px; }

/* 子導覽 */
.billing-nav { display: flex; gap: 6px; flex-wrap: wrap; margin: 0 0 20px; padding: 4px; background: #eceef3; border-radius: 12px; width: fit-content; max-width: 100%; }
.billing-nav__item { display: inline-flex; align-items: center; gap: 6px; padding: 7px 14px; border-radius: 9px; font-size: 13.5px; font-weight: 600; color: var(--b-muted); text-decoration: none; transition: background .15s, color .15s; }
.billing-nav__item i { font-size: 16px; }
.billing-nav__item:hover { color: var(--b-ink); text-decoration: none; }
.billing-nav__item.is-active { background: #fff; color: var(--b-accent-dark); box-shadow: 0 1px 2px rgba(16, 24, 40, .08); }

/* 卡片 */
.billing-card { background: var(--b-card); border: 1px solid var(--b-line); border-radius: var(--b-radius); padding: 22px 24px; margin-bottom: 20px; box-shadow: 0 1px 2px rgba(16, 24, 40, .04); }
.billing-card__title { font-size: 15px; font-weight: 700; margin: 0 0 4px; display: flex; align-items: center; gap: 8px; }
.billing-card__title i { color: var(--b-accent-dark); font-size: 17px; }
.billing-card__hint { color: var(--b-muted); font-size: 12.5px; margin: 0 0 14px; line-height: 1.6; }
.billing-card__head { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }

/* 目前方案 hero */
.billing-hero { position: relative; overflow: hidden; border: 0; color: #fff;
  background: linear-gradient(135deg, var(--b-accent-dark) 0%, var(--b-accent) 55%, #9aa3ff 100%); }
.billing-hero::after { content: ""; position: absolute; right: -60px; top: -60px; width: 220px; height: 220px; border-radius: 50%; background: rgba(255, 255, 255, .12); }
.billing-hero::before { content: ""; position: absolute; right: 40px; bottom: -90px; width: 180px; height: 180px; border-radius: 50%; background: rgba(255, 255, 255, .08); }
.billing-hero > * { position: relative; z-index: 1; }
.billing-hero__label { font-size: 12px; letter-spacing: .14em; opacity: .85; text-transform: uppercase; }
.billing-hero__plan { font-size: 34px; font-weight: 800; letter-spacing: -.02em; line-height: 1.1; margin: 6px 0 4px; }
.billing-hero__tagline { opacity: .9; font-size: 13.5px; margin: 0 0 14px; }
.billing-hero__meta { display: flex; flex-wrap: wrap; gap: 8px 18px; font-size: 13px; opacity: .95; }
.billing-hero__meta strong { font-weight: 700; }
.billing-hero__actions { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }
.billing-hero .btn-light { color: var(--b-accent-dark); font-weight: 600; border: 0; }
.billing-hero .btn-outline-light { border-color: rgba(255, 255, 255, .6); }
.billing-hero .btn-outline-light:hover { background: rgba(255, 255, 255, .15); }

/* 狀態 pill */
.billing-pill { display: inline-flex; align-items: center; gap: 6px; padding: 4px 11px; border-radius: 999px; font-size: 12.5px; font-weight: 600; line-height: 1.4; background: var(--b-soft); color: var(--b-ink); white-space: nowrap; }
.billing-pill::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: currentColor; }
.billing-pill--success { background: #ecfdf3; color: #067647; }
.billing-pill--info    { background: #eff4ff; color: #1d4ed8; }
.billing-pill--warning { background: #fff7e6; color: #b45309; }
.billing-pill--danger  { background: #fef2f2; color: #b91c1c; }
.billing-pill--dark    { background: #eceef3; color: #374151; }
.billing-pill--secondary { background: #eceef3; color: #4b5563; }
.billing-pill--light { background: rgba(255, 255, 255, .22); color: #fff; }

/* 提示列 */
.billing-notice { display: flex; gap: 12px; align-items: flex-start; border-radius: 12px; padding: 14px 16px; margin-bottom: 16px; font-size: 14px; line-height: 1.6; border: 1px solid transparent; }
.billing-notice i { font-size: 18px; margin-top: 1px; }
.billing-notice--info    { background: #eff6ff; border-color: #bfdbfe; color: #1e3a8a; }
.billing-notice--warning { background: #fffbeb; border-color: #fde68a; color: #78350f; }
.billing-notice--danger  { background: #fef2f2; border-color: #fecaca; color: #7f1d1d; }
.billing-notice--success { background: #f0fdf4; border-color: #bbf7d0; color: #14532d; }
.billing-notice .btn { margin-left: auto; white-space: nowrap; }

/* KPI 數字格 */
.billing-kpis { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 12px; margin: 6px 0 16px; }
.billing-kpi { background: var(--b-soft); border-radius: 12px; padding: 12px 14px; }
.billing-kpi__label { font-size: 12px; color: var(--b-muted); }
.billing-kpi__value { font-size: 24px; font-weight: 800; letter-spacing: -.02em; line-height: 1.2; margin-top: 2px; font-variant-numeric: tabular-nums; }
.billing-kpi__value small { font-size: 13px; font-weight: 500; color: var(--b-muted); }
.billing-kpi--accent { background: var(--b-accent-50); }
.billing-kpi--accent .billing-kpi__value { color: var(--b-accent-dark); }

/* 用量進度條 */
.billing-usage { display: grid; gap: 12px; }
.billing-usage__row { display: grid; grid-template-columns: 110px 1fr auto; gap: 12px; align-items: center; font-size: 13.5px; }
.billing-usage__name { font-weight: 600; }
.billing-usage__bar { height: 8px; background: #eceef3; border-radius: 999px; overflow: hidden; }
.billing-usage__fill { height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--b-accent-dark), var(--b-accent)); transition: width .4s ease; }
.billing-usage__fill--warn { background: linear-gradient(90deg, #f59e0b, #fbbf24); }
.billing-usage__fill--over { background: linear-gradient(90deg, #dc2626, #f87171); }
.billing-usage__num { color: var(--b-muted); font-variant-numeric: tabular-nums; white-space: nowrap; text-align: right; }
.billing-usage__num strong { color: var(--b-ink); }
@media (max-width: 575px) { .billing-usage__row { grid-template-columns: 1fr; gap: 4px; } .billing-usage__num { text-align: left; } }

/* 方案卡 */
.billing-plans { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 14px; }
.billing-plan { position: relative; border: 1px solid var(--b-line); border-radius: 14px; padding: 18px 18px 16px; background: #fff; display: flex; flex-direction: column; min-height: 100%; transition: transform .15s ease, box-shadow .15s ease; }
.billing-plan:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(16, 24, 40, .08); }
.billing-plan--recommended { border-color: var(--b-accent); box-shadow: 0 0 0 3px var(--b-accent-50); }
.billing-plan--current { background: var(--b-accent-50); }
.billing-plan__flag { position: absolute; top: -10px; left: 16px; background: var(--b-accent-dark); color: #fff; font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 999px; letter-spacing: .04em; }
.billing-plan__name { font-size: 17px; font-weight: 800; margin: 4px 0 2px; display: flex; align-items: center; gap: 8px; }
.billing-plan__tagline { font-size: 12.5px; color: var(--b-muted); line-height: 1.5; min-height: 38px; }
.billing-plan__price { margin: 12px 0 2px; font-size: 26px; font-weight: 800; letter-spacing: -.02em; line-height: 1; }
.billing-plan__price small { font-size: 13px; font-weight: 500; color: var(--b-muted); letter-spacing: 0; }
.billing-plan__sub { font-size: 12px; color: var(--b-muted); margin-bottom: 10px; }
.billing-plan__points { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; background: #fff7e6; color: #92400e; padding: 3px 9px; border-radius: 999px; margin-bottom: 10px; align-self: flex-start; }
.billing-plan__list { list-style: none; padding: 0; margin: 0 0 14px; font-size: 12.5px; color: #374151; line-height: 1.55; }
.billing-plan__list li { padding-left: 18px; position: relative; margin-bottom: 4px; }
.billing-plan__list li::before { content: "✓"; position: absolute; left: 0; color: var(--b-success); font-weight: 700; }
.billing-plan__actions { margin-top: auto; display: flex; flex-wrap: wrap; gap: 6px; }
.billing-plan__actions form { display: inline; }
.billing-plan__note { font-size: 12px; color: var(--b-muted); margin-top: auto; }

/* 點數包 */
.billing-packs { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.billing-pack { border: 1px solid var(--b-line); background: #fff; border-radius: 10px; padding: 8px 12px; font-size: 13px; font-weight: 600; color: var(--b-ink); }
.billing-pack:hover { border-color: var(--b-accent); color: var(--b-accent-dark); }
.billing-pack small { display: block; font-weight: 500; color: var(--b-muted); font-size: 11.5px; }
.billing-pack--disabled { opacity: .6; }

/* 表格 */
.billing-table { width: 100%; border-collapse: separate; border-spacing: 0; font-size: 13.5px; }
.billing-table th { font-size: 11.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--b-muted); font-weight: 600; padding: 8px 10px; border-bottom: 1px solid var(--b-line); white-space: nowrap; }
.billing-table td { padding: 10px; border-bottom: 1px solid var(--b-line); vertical-align: middle; }
.billing-table tr:last-child td { border-bottom: 0; }
.billing-table tbody tr:hover td { background: var(--b-soft); }
.billing-table .num { text-align: right; font-variant-numeric: tabular-nums; }
.billing-table .muted { color: var(--b-muted); font-size: 12.5px; }
.billing-table__wrap { overflow-x: auto; }
.billing-table a.billing-table__link { font-weight: 600; text-decoration: none; }
.billing-table a.billing-table__link:hover { text-decoration: underline; }
.billing-amount--plus { color: var(--b-success); font-weight: 600; }
.billing-amount--minus { color: var(--b-danger); font-weight: 600; }

/* 帳務資料 */
.billing-profile__grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px 16px; }
.billing-profile__grid .form-label { font-size: 12.5px; color: var(--b-muted); margin-bottom: 4px; }
.billing-profile__summary { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 10px 20px; font-size: 13.5px; }
.billing-profile__summary dt { font-size: 12px; color: var(--b-muted); font-weight: 500; }
.billing-profile__summary dd { margin: 0; font-weight: 600; }

.billing-empty { color: var(--b-muted); font-size: 13.5px; padding: 18px 0; text-align: center; }
.billing-empty i { font-size: 28px; display: block; margin-bottom: 6px; opacity: .5; }
.billing-fine { font-size: 12px; color: var(--b-muted); line-height: 1.6; }
.billing details summary { cursor: pointer; }

/* 帳單明細頁 */
.billing-invoice { max-width: 860px; }
.billing-invoice__head { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; padding-bottom: 16px; border-bottom: 2px solid var(--b-ink); margin-bottom: 18px; }
.billing-invoice__brand { font-size: 22px; font-weight: 800; letter-spacing: .04em; }
.billing-invoice__brand small { display: block; font-size: 12px; color: var(--b-muted); letter-spacing: .12em; font-weight: 600; }
.billing-invoice__no { text-align: right; font-size: 13px; color: var(--b-muted); }
.billing-invoice__no strong { display: block; font-size: 18px; color: var(--b-ink); }
.billing-invoice__parties { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 16px; margin-bottom: 18px; font-size: 13.5px; line-height: 1.7; }
.billing-invoice__parties h6 { font-size: 11.5px; letter-spacing: .1em; text-transform: uppercase; color: var(--b-muted); margin: 0 0 4px; }
.billing-invoice__total { display: flex; justify-content: flex-end; margin-top: 8px; }
.billing-invoice__total div { min-width: 260px; }
.billing-invoice__total .row-line { display: flex; justify-content: space-between; padding: 6px 0; font-size: 14px; }
.billing-invoice__total .row-line--grand { border-top: 2px solid var(--b-ink); margin-top: 6px; padding-top: 10px; font-size: 20px; font-weight: 800; }
.billing-invoice__meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 8px 16px; font-size: 13px; margin-top: 18px; padding-top: 14px; border-top: 1px solid var(--b-line); }
.billing-invoice__meta dt { color: var(--b-muted); font-weight: 500; font-size: 12px; }
.billing-invoice__meta dd { margin: 0; font-weight: 600; }
.billing-toolbar { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 16px; }
@media print { .billing-toolbar, .billing-noprint { display: none !important; } .billing-card { border: 0; box-shadow: none; padding: 0; } }