@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+TC:wght@300;400;500;700&family=Kaisei+Opti:wght@400;700&display=swap');

:root {
  --accent:      #2b9fd8;
  --accent-l:    #45b8ef;
  --accent-d:    #1a7aaa;
  --accent-bg:   rgba(43,159,216,0.08);
  --green:       #22a86a;
  --green-bg:    rgba(34,168,106,0.08);
  --red:         #e05050;
  --red-bg:      rgba(224,80,80,0.08);
  --text:        #1a2a38;
  --text-2:      #4a6070;
  --text-3:      #8aa0b0;
  --card:        rgba(255,255,255,0.95);
  --card-border: rgba(255,255,255,0.98);
  --input-bg:    #f4f8fc;
  --input-bd:    #d0dde8;
  --shadow-card: 0 20px 60px rgba(0,0,0,0.15), 0 4px 16px rgba(0,0,0,0.08);
  --radius:      18px;
  --radius-sm:   12px;
  --radius-xs:   10px;
}

* { margin:0; padding:0; box-sizing:border-box; -webkit-tap-highlight-color:transparent; }

html, body {
  width:100%; min-height:100vh;
  font-family:'Noto Sans TC', sans-serif;
  -webkit-font-smoothing:antialiased;
  color:var(--text);
}

/* 背景 */
#pwa-bg {
  position:fixed; inset:0; z-index:0;
  background-size:cover; background-position:center; background-repeat:no-repeat;
  transition:opacity .6s;
}
#pwa-bg.default {
  background:
    radial-gradient(ellipse 75% 55% at 15% 10%, rgba(180,215,240,0.85) 0%, transparent 55%),
    radial-gradient(ellipse 65% 50% at 85% 90%, rgba(160,205,235,0.7) 0%, transparent 52%),
    linear-gradient(145deg, #c8dff0 0%, #d8eaf6 40%, #e4f0f8 70%, #cce0ee 100%);
}
#pwa-bg-mask {
  position:fixed; inset:0; z-index:1;
  background:rgba(0,0,0,0); pointer-events:none; transition:background .4s;
}

/* 頁面容器 */
.page-center {
  position:relative; z-index:10;
  min-height:100vh;
  display:flex; flex-direction:column;
  align-items:center; justify-content:center;
  padding:24px 20px 32px;
}

/* 主卡片 */
.main-card {
  width:100%; max-width:400px;
  background:var(--card);
  border-radius:var(--radius);
  box-shadow:var(--shadow-card);
  border:1px solid var(--card-border);
  overflow:hidden;
  animation:cardIn .45s cubic-bezier(.2,.8,.4,1) both;
}
@keyframes cardIn { from{opacity:0;transform:translateY(24px) scale(.97)} to{opacity:1;transform:translateY(0) scale(1)} }

.card-top-bar {
  height:5px;
  background:linear-gradient(90deg,#2b9fd8,#45c8e8,#2b9fd8);
  background-size:200%;
  animation:shimmer 3s linear infinite;
}
@keyframes shimmer { 0%{background-position:0%} 100%{background-position:200%} }

.card-body { padding:32px 28px 28px; }

/* Logo */
.logo-block {
  display:flex; flex-direction:column; align-items:center;
  gap:12px; margin-bottom:28px; text-align:center;
}
.logo-icon {
  width:68px; height:68px; border-radius:20px;
  background:linear-gradient(145deg,#45b8ef,#1a88c8);
  display:flex; align-items:center; justify-content:center;
  font-size:1.9rem;
  box-shadow:0 8px 28px rgba(43,159,216,0.35), inset 0 1px 0 rgba(255,255,255,0.3);
}
.logo-name {
  font-family:'Kaisei Opti',serif;
  font-size:1.28rem; font-weight:700;
  color:var(--text); letter-spacing:.04em; line-height:1.2;
}
.logo-sub { font-size:.68rem; color:var(--text-3); letter-spacing:.28em; text-transform:uppercase; margin-top:-4px; }

/* 分隔線 */
.divider { display:flex; align-items:center; gap:12px; margin:20px 0; }
.divider-line { flex:1; height:1px; background:var(--input-bd); }
.divider-text { font-size:.7rem; color:var(--text-3); letter-spacing:.1em; white-space:nowrap; }

/* 輸入框 */
.field { display:flex; flex-direction:column; gap:8px; margin-bottom:16px; }
.field-label { font-size:.8rem; color:var(--text-2); font-weight:700; letter-spacing:.05em; display:flex; align-items:center; gap:6px; }
.field-optional { font-size:.62rem; background:#eef3f8; color:var(--text-3); padding:1px 8px; border-radius:100px; font-weight:400; }
.input-wrap { position:relative; }
.field-input {
  width:100%; padding:14px 18px;
  background:var(--input-bg); border:2px solid var(--input-bd);
  border-radius:var(--radius-sm);
  font-family:'Noto Sans TC',sans-serif;
  font-size:.96rem; color:var(--text); outline:none;
  transition:border-color .2s, box-shadow .2s, background .2s;
  -webkit-font-smoothing:antialiased;
}
.field-input:focus { border-color:var(--accent); background:#fff; box-shadow:0 0 0 3px rgba(43,159,216,0.14); }
.field-input::placeholder { color:var(--text-3); font-size:.88rem; }
.field-input.has-icon { padding-right:46px; }
.input-icon { position:absolute; right:14px; top:50%; transform:translateY(-50%); color:var(--text-3); font-size:1.05rem; cursor:pointer; background:none; border:none; padding:2px; transition:color .2s; }
.input-icon:hover { color:var(--accent); }

/* 注意事項 */
.notice-box { background:#fffbf0; border:1.5px solid #f0d890; border-radius:var(--radius-xs); padding:12px 16px; margin-bottom:16px; display:flex; align-items:flex-start; gap:10px; }
.notice-icon { font-size:1rem; flex-shrink:0; margin-top:1px; }
.notice-text { font-size:.76rem; color:#806020; line-height:1.75; letter-spacing:.04em; font-weight:500; }

/* 按鈕 */
.btn-main {
  width:100%; padding:16px; border:none; border-radius:var(--radius-xs); cursor:pointer;
  font-family:'Noto Sans TC',sans-serif; font-size:1rem; font-weight:700; letter-spacing:.14em;
  transition:all .22s; -webkit-font-smoothing:antialiased;
}
.btn-main:active { transform:scale(0.98); }
.btn-accent { background:linear-gradient(135deg,#3ab8f0,#1a90d0); color:#fff; box-shadow:0 6px 24px rgba(43,159,216,0.4), inset 0 1px 0 rgba(255,255,255,0.25); }
.btn-accent:hover { background:linear-gradient(135deg,#4ac8ff,#2aa0e0); transform:translateY(-1px); box-shadow:0 8px 28px rgba(43,159,216,0.48); }
.btn-green  { background:linear-gradient(135deg,#30c878,#18a058); color:#fff; box-shadow:0 6px 24px rgba(34,168,106,0.35), inset 0 1px 0 rgba(255,255,255,0.2); }
.btn-green:hover  { background:linear-gradient(135deg,#40d888,#28b068); transform:translateY(-1px); }
.btn-light  { background:#f0f6fc; color:var(--text-2); border:2px solid var(--input-bd); box-shadow:none; }
.btn-light:hover  { background:#e4f0f8; border-color:#b0cce0; }

/* 連結列 */
.link-row { text-align:center; font-size:.8rem; color:var(--text-3); margin-top:16px; letter-spacing:.04em; line-height:1.8; }
.link-row a { color:var(--accent-d); text-decoration:none; font-weight:700; }
.link-row a:hover { text-decoration:underline; }

/* Tab */
.tab-wrap { display:flex; background:var(--input-bg); border:2px solid var(--input-bd); border-radius:var(--radius-xs); padding:3px; margin-bottom:20px; }
.tab-btn { flex:1; padding:9px; border:none; border-radius:8px; cursor:pointer; font-family:'Noto Sans TC',sans-serif; font-size:.82rem; font-weight:700; letter-spacing:.06em; color:var(--text-3); background:transparent; transition:all .2s; }
.tab-btn.active { background:#fff; color:var(--accent-d); box-shadow:0 2px 8px rgba(0,0,0,0.1); }

/* 已記住帳號 */
.saved-list { display:flex; flex-direction:column; gap:8px; margin-bottom:4px; }
.saved-item { display:flex; align-items:center; gap:14px; padding:13px 16px; background:var(--input-bg); border:2px solid var(--input-bd); border-radius:var(--radius-sm); cursor:pointer; transition:all .18s; }
.saved-item:hover { background:#fff; border-color:var(--accent); box-shadow:0 2px 12px rgba(43,159,216,0.12); }
.saved-ava { width:40px; height:40px; border-radius:50%; flex-shrink:0; background:linear-gradient(145deg,#45b8ef,#1a88c8); display:flex; align-items:center; justify-content:center; font-family:'Kaisei Opti',serif; font-size:1.05rem; color:#fff; font-weight:700; box-shadow:0 3px 10px rgba(43,159,216,0.28); }
.saved-info { flex:1; }
.saved-name { font-size:.92rem; color:var(--text); font-weight:700; }
.saved-meta { font-size:.7rem; color:var(--text-3); margin-top:2px; }
.saved-arrow { font-size:1rem; color:var(--text-3); }

/* 密碼強度 */
.pwd-meter { height:4px; border-radius:4px; background:var(--input-bd); margin-top:8px; overflow:hidden; }
.pwd-bar   { height:100%; border-radius:4px; transition:width .35s, background .35s; width:0; }
.rule-list { display:flex; flex-direction:column; gap:4px; margin-top:8px; }
.rule-item { display:flex; align-items:center; gap:7px; font-size:.72rem; color:var(--text-3); transition:color .2s; }
.rule-item.ok { color:var(--green); }
.rule-dot  { width:5px; height:5px; border-radius:50%; background:currentColor; flex-shrink:0; }

/* 步驟條 */
.step-bar { display:flex; align-items:center; margin-bottom:20px; }
.step-item { flex:1; display:flex; flex-direction:column; align-items:center; gap:5px; position:relative; }
.step-item:not(:last-child)::after { content:''; position:absolute; top:13px; left:calc(50% + 14px); right:calc(-50% + 14px); height:2px; background:var(--input-bd); transition:background .3s; }
.step-item.done::after { background:var(--green); }
.step-dot { width:26px; height:26px; border-radius:50%; background:var(--input-bg); border:2px solid var(--input-bd); display:flex; align-items:center; justify-content:center; font-size:.66rem; color:var(--text-3); font-weight:700; transition:all .25s; z-index:1; }
.step-item.active .step-dot { background:var(--accent); border-color:var(--accent); color:#fff; box-shadow:0 3px 10px rgba(43,159,216,0.3); }
.step-item.done   .step-dot { background:var(--green); border-color:var(--green); color:#fff; }
.step-lbl { font-size:.6rem; color:var(--text-3); letter-spacing:.06em; font-weight:700; white-space:nowrap; }
.step-item.active .step-lbl { color:var(--accent); }
.step-item.done   .step-lbl { color:var(--green); }

/* 成功卡 */
.success-card { width:100%; max-width:400px; background:var(--card); border-radius:var(--radius); box-shadow:var(--shadow-card); border:1px solid var(--card-border); overflow:hidden; display:none; animation:cardIn .45s cubic-bezier(.2,.8,.4,1) both; }
.success-body { padding:40px 28px 32px; text-align:center; }
.s-emoji { font-size:4.5rem; display:block; margin-bottom:14px; animation:bounceIn .5s ease both; }
.s-title { font-family:'Kaisei Opti',serif; font-size:1.45rem; color:var(--green); font-weight:700; margin-bottom:6px; }
.s-sub   { font-size:.78rem; color:var(--text-3); line-height:1.85; letter-spacing:.05em; }
.id-box  { background:linear-gradient(135deg,#f0fdf6,#e4f8ed); border:2px solid #90d8b0; border-radius:var(--radius-sm); padding:16px; margin:14px 0; font-family:'Kaisei Opti',serif; font-size:1.7rem; font-weight:700; color:var(--text); letter-spacing:.22em; }

/* 底部導航 */
.bottom-nav { position:fixed; bottom:0; left:0; right:0; z-index:100; background:rgba(250,253,255,0.96); border-top:2px solid #e0eaf4; backdrop-filter:blur(24px); display:flex; padding-bottom:env(safe-area-inset-bottom,0); box-shadow:0 -2px 20px rgba(0,0,0,0.06); }
.nav-item { flex:1; display:flex; flex-direction:column; align-items:center; gap:3px; padding:11px 0; cursor:pointer; text-decoration:none; color:var(--text-3); transition:color .18s; }
.nav-item.active { color:var(--accent); }
.nav-icon  { font-size:1.3rem; line-height:1; }
.nav-label { font-size:.6rem; letter-spacing:.1em; font-weight:700; }

/* Toast */
#pwa-toast { position:fixed; bottom:82px; left:50%; transform:translateX(-50%) translateY(10px); padding:12px 26px; border-radius:100px; font-size:.84rem; font-weight:700; letter-spacing:.06em; opacity:0; transition:all .32s ease; z-index:9999; white-space:nowrap; pointer-events:none; font-family:'Noto Sans TC',sans-serif; -webkit-font-smoothing:antialiased; box-shadow:0 6px 24px rgba(0,0,0,0.14); }
#pwa-toast.show { opacity:1; transform:translateX(-50%) translateY(0); }
#pwa-toast.info    { background:#fff; border:2px solid #b0d8f0; color:#1a6080; }
#pwa-toast.success { background:#fff; border:2px solid #90d8b0; color:#1a6040; }
#pwa-toast.error   { background:#fff; border:2px solid #f0a0a0; color:#802020; }
#pwa-toast.warn    { background:#fff; border:2px solid #f0d090; color:#806020; }

/* 換背景按鈕 */
#bg-change-btn { position:fixed; bottom:75px; right:16px; z-index:200; width:38px; height:38px; border-radius:50%; cursor:pointer; background:rgba(255,255,255,0.82); border:2px solid rgba(255,255,255,0.95); display:flex; align-items:center; justify-content:center; font-size:.9rem; box-shadow:0 3px 14px rgba(0,0,0,0.14); transition:all .2s; backdrop-filter:blur(10px); }
#bg-change-btn:hover { background:#fff; transform:scale(1.08); }
#bg-file { display:none; }

/* 載入 */
.spinner { width:24px; height:24px; border-radius:50%; border:2.5px solid rgba(43,159,216,0.12); border-top-color:var(--accent); animation:spin .8s linear infinite; margin:0 auto; }
@keyframes spin { to { transform:rotate(360deg); } }

/* 動畫 */
@keyframes fadeUp   { from{opacity:0;transform:translateY(14px)} to{opacity:1;transform:translateY(0)} }
@keyframes bounceIn { 0%{transform:scale(.2);opacity:0} 60%{transform:scale(1.1)} 100%{transform:scale(1);opacity:1} }
.a1 { animation:fadeUp .4s ease both; }
.a2 { animation:fadeUp .4s .07s ease both; }
.a3 { animation:fadeUp .4s .14s ease both; }
.a4 { animation:fadeUp .4s .21s ease both; }