/* ============================================================
   TW Decision｜銷售頁樣式
   版本：V1.01 | 2026-02-24 14:00

   --- 版本紀錄 ---
   V1.01 | 2026-02-24 14:00
     - 銷售頁改版：依轉單強化版 V3/V4 重新設計
     - 移除 VIP，僅保留免費 + Pro（2 欄定價）
     - 新增：痛點 X 標記、卡關區、價值主張、對比卡片、FAQ、風險提醒
   V1.00 | 2026-02-24 12:00
     - 初始建立：7 區塊銷售頁排版、響應式、登入 Modal

   功能：銷售頁（Landing Page）的所有視覺樣式
   設計：深色主題（與主程式一致）、行動優先、轉換導向
   關聯：index.html（銷售頁）、landing.js
   ============================================================ */

/* ---------- CSS 變數（與主程式 styles.css 一致） ---------- */
:root {
  --bg-primary:   #0f172a;
  --bg-secondary: #1e293b;
  --bg-card:      #1e293b;
  --bg-hover:     #334155;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted:   #64748b;
  --accent:       #3b82f6;
  --accent-hover: #2563eb;
  --green:        #22c55e;
  --red:          #ef4444;
  --orange:       #f59e0b;
  --purple:       #a855f7;
  --border:       #334155;
  --radius:       12px;
  --shadow:       0 4px 24px rgba(0, 0, 0, 0.3);
}

/* ---------- 基礎 ---------- */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 導覽列 ---------- */
.landing-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.landing-nav-inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.landing-logo {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.5px;
}

.landing-logo-icon {
  width: 28px;
  height: 28px;
  border-radius: 6px;
}

.landing-nav-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.landing-nav-btn {
  padding: 0.4rem 1rem;
  border-radius: 8px;
  font-size: 0.85rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  text-decoration: none;
  transition: all 0.2s;
}

.landing-nav-btn--ghost {
  background: transparent;
  color: var(--text-secondary);
}

.landing-nav-btn--ghost:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.landing-nav-btn--primary {
  background: var(--accent);
  color: #fff;
}

.landing-nav-btn--primary:hover {
  background: var(--accent-hover);
}

/* ---------- 共用容器 ---------- */
.landing-container {
  max-width: 860px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* ---------- 區塊通用 ---------- */
.landing-section {
  padding: 4.5rem 0;
}

.landing-section--alt {
  background: var(--bg-secondary);
}

.landing-section-title {
  text-align: center;
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.75rem;
  color: var(--text-primary);
}

.landing-section-sub {
  text-align: center;
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

/* ---------- Hero ---------- */
.landing-hero {
  padding: 7.5rem 1.25rem 4.5rem;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% 0%, rgba(59, 130, 246, 0.12) 0%, transparent 70%),
    var(--bg-primary);
}

.landing-hero-inner {
  max-width: 680px;
  margin: 0 auto;
}

.landing-hero-title {
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.landing-hero-sub {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
  line-height: 1.7;
}

.landing-hero-points {
  list-style: none;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 2rem;
}

.landing-hero-points li {
  font-size: 1rem;
  color: var(--text-secondary);
}

.landing-hero-points li::before {
  content: "\279C  ";
  color: var(--accent);
}

.landing-hero-cta {
  margin-bottom: 1rem;
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  flex-wrap: wrap;
}

.landing-hero-note {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ---------- 按鈕 ---------- */
.landing-btn {
  display: inline-block;
  padding: 0.65rem 1.75rem;
  border-radius: 10px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
  text-decoration: none;
}

.landing-btn--primary {
  background: var(--accent);
  color: #fff;
}

.landing-btn--primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
}

.landing-btn--outline {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}

.landing-btn--outline:hover {
  background: rgba(59, 130, 246, 0.1);
  transform: translateY(-1px);
}

.landing-btn--lg {
  padding: 0.85rem 2.5rem;
  font-size: 1.1rem;
  border-radius: 12px;
}

.landing-btn--lg.landing-btn--primary,
.landing-btn--lg:not(.landing-btn--outline) {
  background: var(--accent);
  color: #fff;
}

.landing-btn--lg:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 28px rgba(59, 130, 246, 0.4);
}

/* ---------- Grid 系統 ---------- */
.landing-grid {
  display: grid;
  gap: 1.25rem;
}

.landing-grid--2 {
  grid-template-columns: repeat(2, 1fr);
}

.landing-grid--3 {
  grid-template-columns: repeat(3, 1fr);
}

.landing-grid--4 {
  grid-template-columns: repeat(4, 1fr);
}

/* ---------- 卡片通用 ---------- */
.landing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  transition: all 0.2s;
}

.landing-card:hover {
  border-color: rgba(59, 130, 246, 0.4);
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.landing-card-icon {
  font-size: 1.75rem;
  margin-bottom: 0.5rem;
  line-height: 1;
}

.landing-card-icon--accent {
  color: var(--accent);
}

.landing-card h3 {
  font-size: 1.05rem;
  font-weight: 700;
  margin-bottom: 0.4rem;
  color: var(--text-primary);
}

.landing-card p {
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- 痛點卡片 ---------- */
.landing-card--pain {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1.25rem;
  text-align: left;
}

.landing-pain-x {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--red);
  flex-shrink: 0;
  line-height: 1.5;
}

.landing-pain-conclusion {
  text-align: center;
  margin-top: 2rem;
  font-size: 1.05rem;
  color: var(--text-secondary);
  line-height: 1.8;
}

.landing-pain-conclusion strong {
  color: var(--accent);
}

/* ---------- 卡關區 ---------- */
.landing-stuck-box {
  max-width: 600px;
  margin: 2rem auto 0;
  text-align: center;
  padding: 2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 2;
}

.landing-stuck-result {
  margin-top: 1rem;
  font-size: 1.1rem;
  color: var(--text-primary);
}

.landing-stuck-result strong {
  color: var(--red);
}

/* ---------- 價值主張 ---------- */
.landing-value-box {
  max-width: 600px;
  margin: 2rem auto 0;
  text-align: center;
  font-size: 1.15rem;
  color: var(--text-secondary);
  line-height: 2;
}

.landing-value-highlight {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  margin-top: 0.5rem;
}

/* ---------- 功能卡片 ---------- */
.landing-card--feature {
  padding: 1.75rem 1.5rem;
}

.landing-feature-point {
  margin-top: 0.75rem;
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
}

.landing-feature-point::before {
  content: "\279C  ";
}

.landing-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: 0.75rem;
}

.landing-tags span {
  display: inline-block;
  padding: 0.2rem 0.55rem;
  border-radius: 4px;
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(59, 130, 246, 0.15);
  color: var(--accent);
}

.landing-tag--rocket { background: rgba(239, 68, 68, 0.2) !important; color: var(--red) !important; }
.landing-tag--strong { background: rgba(245, 158, 11, 0.2) !important; color: var(--orange) !important; }
.landing-tag--normal { background: rgba(100, 116, 139, 0.2) !important; color: var(--text-secondary) !important; }
.landing-tag--weak   { background: rgba(100, 116, 139, 0.15) !important; color: var(--text-muted) !important; }

/* ---------- 判斷理由 ---------- */
.landing-reason-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1.5rem;
}

.landing-reason-tags span {
  padding: 0.4rem 1rem;
  border-radius: 20px;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  color: var(--text-primary);
}

.landing-reason-conclusion {
  text-align: center;
  font-size: 1.05rem;
  color: var(--text-secondary);
}

.landing-reason-conclusion strong {
  color: var(--accent);
}

/* ---------- 對比卡片 ---------- */
.landing-compare-grid {
  max-width: 700px;
  margin: 2rem auto 0;
}

.landing-card--compare {
  padding: 1.75rem;
}

.landing-card--compare h3 {
  font-size: 1.1rem;
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.landing-compare-icon {
  font-size: 1.2rem;
  font-weight: 700;
}

.landing-card--compare-bad .landing-compare-icon {
  color: var(--red);
}

.landing-card--compare-good .landing-compare-icon {
  color: var(--green);
}

.landing-card--compare ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.landing-card--compare-bad ul li {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.landing-card--compare-bad ul li::before {
  content: "- ";
  color: var(--text-muted);
}

.landing-card--compare-good ul li {
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.landing-card--compare-good ul li::before {
  content: "- ";
  color: var(--green);
}

.landing-card--compare-good {
  border-color: rgba(34, 197, 94, 0.3);
}

.landing-card--compare-good:hover {
  border-color: var(--green);
}

/* ---------- 使用流程 ---------- */
.landing-steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0.75rem;
  margin-top: 2rem;
}

.landing-step {
  text-align: center;
  flex: 1;
  max-width: 180px;
}

.landing-step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 1.15rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 0.6rem;
}

.landing-step p {
  font-size: 0.88rem;
  color: var(--text-secondary);
}

.landing-step-arrow {
  font-size: 1.25rem;
  color: var(--text-muted);
  padding-top: 0.6rem;
  flex-shrink: 0;
}

.landing-steps-conclusion {
  text-align: center;
  margin-top: 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--accent);
}

.landing-steps-conclusion::before {
  content: "\279C  ";
}

/* ---------- 定價卡片 ---------- */
.landing-pricing-grid {
  max-width: 700px;
  margin: 2rem auto 0;
  align-items: start;
}

.landing-card--pricing {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 2rem 1.5rem;
  text-align: center;
}

.landing-card--pricing-featured {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent), 0 8px 32px rgba(59, 130, 246, 0.15);
  transform: scale(1.03);
}

.landing-card--pricing-featured:hover {
  transform: scale(1.05);
}

.landing-pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.2rem 1rem;
  border-radius: 20px;
}

.landing-pricing-header {
  margin-bottom: 0.75rem;
}

.landing-pricing-header h3 {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.landing-pricing-price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.25rem;
}

.landing-price-amount {
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-primary);
}

.landing-price-unit {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.landing-pricing-daily {
  font-size: 0.85rem;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 1rem;
}

.landing-pricing-list {
  list-style: none;
  text-align: left;
  margin-bottom: 1rem;
  flex: 1;
}

.landing-pricing-list li {
  padding: 0.4rem 0;
  font-size: 0.88rem;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(51, 65, 85, 0.5);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.landing-pricing-list li::before {
  content: "\2713";
  color: var(--green);
  font-weight: 700;
  flex-shrink: 0;
}

.landing-pricing-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.landing-pricing-btn {
  width: 100%;
}

/* ---------- 信任 / 為什麼選擇 ---------- */
.landing-card--trust {
  text-align: center;
  padding: 1.25rem 1rem;
}

.landing-card--trust .landing-card-icon {
  font-size: 1.5rem;
  margin-bottom: 0.35rem;
}

/* ---------- FAQ ---------- */
.landing-faq-list {
  max-width: 640px;
  margin: 2rem auto 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.landing-faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.landing-faq-item summary {
  padding: 1rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--text-primary);
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.landing-faq-item summary::after {
  content: "+";
  font-size: 1.25rem;
  color: var(--text-muted);
  flex-shrink: 0;
  transition: transform 0.2s;
}

.landing-faq-item[open] summary::after {
  content: "\2212";
}

.landing-faq-item summary::-webkit-details-marker {
  display: none;
}

.landing-faq-item p {
  padding: 0 1.25rem 1rem;
  font-size: 0.9rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ---------- 風險提醒 ---------- */
.landing-disclaimer {
  max-width: 640px;
  margin: 0 auto;
  padding: 1.5rem;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.85rem;
  color: var(--text-muted);
  line-height: 1.8;
}

.landing-disclaimer strong {
  color: var(--text-secondary);
}

/* ---------- CTA 收尾區 ---------- */
.landing-section--cta {
  padding: 5rem 0;
  text-align: center;
  background:
    radial-gradient(ellipse 60% 50% at 50% 100%, rgba(59, 130, 246, 0.1) 0%, transparent 70%),
    var(--bg-primary);
}

.landing-cta-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 0.5rem;
  color: var(--text-primary);
}

.landing-cta-sub {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-bottom: 2rem;
}

.landing-cta-login {
  margin-top: 1rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.landing-link-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  text-decoration: underline;
  padding: 0;
}

.landing-link-btn:hover {
  color: var(--accent-hover);
}

/* ---------- Footer ---------- */
.landing-footer {
  padding: 2rem 1.25rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
}

/* ---------- 登入 Modal（與主程式 styles.css 一致） ---------- */
.auth-modal {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(0, 0, 0, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.auth-modal-content {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  width: 100%;
  max-width: 380px;
  box-shadow: var(--shadow);
}

.auth-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1rem;
}

.auth-header h2 {
  font-size: 1.25rem;
  color: var(--text-primary);
}

.auth-close {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.5rem;
  cursor: pointer;
  line-height: 1;
  padding: 0 0.25rem;
}

.auth-close:hover {
  color: var(--text-primary);
}

.auth-tabs {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1rem;
}

.auth-tab {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
}

.auth-tab:hover {
  color: var(--text-primary);
}

.auth-tab.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.auth-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.auth-form input {
  padding: 0.6rem 0.9rem;
  background: var(--bg-primary);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 0.95rem;
}

.auth-form input::placeholder {
  color: var(--text-muted);
}

.auth-submit {
  padding: 0.6rem 1rem;
  background: var(--accent);
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}

.auth-submit:hover {
  opacity: 0.9;
}

.auth-link-hint {
  font-size: 0.8rem;
  color: var(--orange);
}

.auth-divider {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.85rem;
  margin: 1rem 0;
}

.auth-social {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.auth-btn-google,
.auth-btn-apple {
  padding: 0.6rem 1rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 0.9rem;
  cursor: pointer;
  transition: background 0.2s;
}

.auth-btn-google:hover,
.auth-btn-apple:hover {
  background: var(--bg-hover);
}

.auth-error {
  margin-top: 1rem;
  padding: 0.5rem;
  font-size: 0.85rem;
  color: var(--red);
  background: rgba(239, 68, 68, 0.1);
  border-radius: 8px;
}

/* ---------- 響應式 ---------- */

@media (max-width: 1024px) {
  .landing-grid--4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .landing-hero {
    padding: 6rem 1rem 3rem;
  }

  .landing-hero-title {
    font-size: 1.75rem;
  }

  .landing-hero-sub {
    font-size: 1rem;
  }

  .landing-section {
    padding: 3rem 0;
  }

  .landing-section-title {
    font-size: 1.35rem;
  }

  .landing-grid--2,
  .landing-grid--3,
  .landing-grid--4 {
    grid-template-columns: 1fr;
  }

  .landing-card--pricing-featured {
    transform: none;
  }

  .landing-card--pricing-featured:hover {
    transform: translateY(-2px);
  }

  .landing-steps {
    flex-direction: column;
    align-items: center;
  }

  .landing-step-arrow {
    transform: rotate(90deg);
    padding: 0;
  }

  .landing-btn--lg {
    width: 100%;
    text-align: center;
  }

  .landing-cta-title {
    font-size: 1.35rem;
  }

  .landing-value-highlight {
    font-size: 1.25rem;
  }
}