:root{--glass: rgba(255,255,255,.55);--glass-hover: rgba(255,255,255,.72);--glass-active: rgba(255,255,255,.8);--glass-border: rgba(255,255,255,.45);--glass-shadow: 0 8px 32px rgba(0,0,0,.06), 0 1px 3px rgba(0,0,0,.04);--blur: 24px;--text: #1a1a2e;--text-secondary: #64748b;--text-tertiary: #94a3b8;--accent: #007AFF;--accent-light: rgba(0,122,255,.12);--danger: #FF3B30;--danger-light: rgba(255,59,48,.1);--success: #34C759;--warning: #FF9500;--radius: 20px;--radius-sm: 14px;--radius-xs: 10px;--font: "Inter",-apple-system,BlinkMacSystemFont,"SF Pro Display","Segoe UI",sans-serif;--safe-bottom: env(safe-area-inset-bottom,0px);--bottombar-h: 64px}*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{font-family:var(--font);color:var(--text);background:#dbeafe;overflow-x:hidden;-webkit-font-smoothing:antialiased}body{min-height:100vh;min-height:100dvh}.app-shell{position:relative;min-height:100vh;min-height:100dvh}.app-bg{position:fixed;top:0;right:0;bottom:0;left:0;z-index:0;background:radial-gradient(ellipse 80% 60% at 20% 10%,#93c5fd 0%,transparent 50%),radial-gradient(ellipse 60% 50% at 85% 20%,#c4b5fd 0%,transparent 50%),radial-gradient(ellipse 70% 55% at 50% 80%,#f9a8d4 0%,transparent 50%),radial-gradient(ellipse 50% 40% at 10% 90%,#67e8f9 0%,transparent 50%),linear-gradient(180deg,#eff6ff,#faf5ff,#fdf2f8);animation:bgShift 25s ease-in-out infinite alternate}@keyframes bgShift{0%{background-position:0% 0%,100% 0%,50% 100%,0% 100%,center}to{background-position:10% 5%,90% 10%,40% 90%,15% 85%,center}}.app-content{position:relative;z-index:1;max-width:480px;margin:0 auto;padding:0 16px 16px}.page{padding-top:calc(env(safe-area-inset-top,12px) + 8px)}.page-with-bottombar{padding-bottom:calc(140px + var(--safe-bottom))}.page-header{padding:24px 4px 20px}.page-title{font-size:34px;font-weight:700;letter-spacing:-.5px;background:linear-gradient(135deg,var(--text) 0%,#4338ca 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.page-subtitle{margin-top:6px;font-size:15px;color:var(--text-secondary)}.nav-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 0;position:sticky;top:0;z-index:10}.nav-back{display:flex;align-items:center;gap:2px;background:none;border:none;color:var(--accent);font-size:16px;font-weight:500;cursor:pointer;padding:8px 4px;font-family:var(--font)}.nav-title{font-size:17px;font-weight:600;display:flex;align-items:center;gap:8px}.glass-card{background:var(--glass);backdrop-filter:blur(var(--blur));-webkit-backdrop-filter:blur(var(--blur));border-radius:var(--radius);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow);padding:18px;transition:all .3s cubic-bezier(.25,.46,.45,.94)}.glass-card:hover{background:var(--glass-hover)}.badge{display:inline-flex;align-items:center;padding:2px 10px;border-radius:20px;font-size:12px;font-weight:600}.badge.ended{background:var(--danger-light);color:var(--danger);margin-left:8px}.badge.ended.small{font-size:11px;padding:1px 8px}.admin-tag{font-size:11px;color:var(--warning);font-weight:500;margin-left:6px}.trip-list{display:flex;flex-direction:column;gap:14px}.trip-card{cursor:pointer}.trip-card:active{transform:scale(.98);background:var(--glass-active)}.trip-card-header{display:flex;align-items:center;gap:12px}.trip-card-icon{width:44px;height:44px;border-radius:14px;background:linear-gradient(135deg,#dbeafe,#e9d5ff);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.trip-card-info{flex:1;min-width:0}.trip-card-info h3{font-size:17px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;display:flex;align-items:center}.trip-card-meta{font-size:13px;color:var(--text-secondary);margin-top:2px}.trip-card-members{display:flex;flex-wrap:wrap;gap:6px;margin-top:14px}.member-chip{display:inline-flex;align-items:center;gap:5px;padding:4px 12px 4px 4px;border-radius:20px;background:#ffffff80;font-size:13px;font-weight:500;color:var(--text-secondary);border:1px solid rgba(255,255,255,.3)}.chip-avatar{width:22px;height:22px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:10px;font-weight:600;flex-shrink:0}.trip-card-footer{display:flex;justify-content:space-between;align-items:center;margin-top:14px;padding-top:14px;border-top:1px solid rgba(255,255,255,.3)}.trip-card-total{font-size:16px;font-weight:600;color:var(--accent)}.trip-card-date{font-size:12px;color:var(--text-tertiary)}.summary-card{text-align:center;padding:28px 20px;margin-bottom:8px;background:linear-gradient(135deg,#fff9,#fff6)}.summary-card.compact{padding:20px}.summary-label{font-size:14px;font-weight:500;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.summary-amount{font-size:42px;font-weight:700;margin-top:4px;letter-spacing:-1px;background:linear-gradient(135deg,var(--text),#4338ca);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.summary-card.compact .summary-amount{font-size:34px}.summary-meta{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:8px;font-size:14px;color:var(--text-secondary)}.dot{width:4px;height:4px;border-radius:50%;background:var(--text-tertiary)}.tab-content{display:flex;flex-direction:column;gap:12px}.section-header{padding:20px 4px 10px}.section-header h3{font-size:17px;font-weight:600}.date-filter{display:flex;gap:8px;overflow-x:auto;padding:4px 0 12px;-ms-overflow-style:none;scrollbar-width:none}.date-filter::-webkit-scrollbar{display:none}.date-chip{padding:6px 16px;border:1.5px solid rgba(255,255,255,.4);border-radius:20px;background:#fff6;font-size:13px;font-weight:500;color:var(--text-secondary);cursor:pointer;white-space:nowrap;transition:all .2s ease;font-family:var(--font)}.date-chip.active{background:var(--accent);color:#fff;border-color:var(--accent);box-shadow:0 2px 8px #007aff40}.expense-list{display:flex;flex-direction:column;gap:10px}.expense-card{padding:14px 16px;position:relative;cursor:pointer}.expense-main{display:flex;justify-content:space-between;align-items:flex-start;gap:12px}.expense-info{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}.expense-desc{font-size:16px;font-weight:600}.expense-meta{font-size:13px;color:var(--text-secondary)}.cny-equiv{color:var(--accent);font-weight:500}.expense-amount{font-size:18px;font-weight:700;white-space:nowrap;flex-shrink:0}.expense-splits{margin-top:12px;padding-top:10px;border-top:1px dashed rgba(0,0,0,.06)}.split-label{font-size:12px;color:var(--text-tertiary);font-weight:500}.split-avatars{display:flex;flex-wrap:wrap;gap:8px;margin-top:6px}.split-person{display:flex;align-items:center;gap:4px}.split-avatar{width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:11px;font-weight:600;flex-shrink:0}.split-amount{font-size:12px;color:var(--text-secondary);font-weight:500}.expense-popover{position:absolute;top:8px;right:8px;z-index:20;display:flex;gap:4px;background:#fff;border-radius:var(--radius-xs);box-shadow:0 4px 16px #0000001f;padding:4px;animation:popIn .15s ease}@keyframes popIn{0%{opacity:0;transform:scale(.9)}to{opacity:1;transform:scale(1)}}.popover-btn{display:flex;align-items:center;gap:6px;padding:8px 14px;border:none;background:transparent;border-radius:8px;font-size:13px;font-weight:500;cursor:pointer;color:var(--text);transition:background .15s;font-family:var(--font)}.popover-btn:hover{background:var(--accent-light);color:var(--accent)}.popover-btn.danger:hover{background:var(--danger-light);color:var(--danger)}.settlement-list{display:flex;flex-direction:column;gap:12px}.settlement-card{text-align:center;padding:20px}.settlement-arrow{display:flex;align-items:center;justify-content:center;gap:16px;margin-bottom:12px}.settlement-person{display:flex;flex-direction:column;align-items:center;gap:6px}.settlement-person span{font-size:14px;font-weight:500}.arrow-icon{color:var(--text-tertiary)}.settlement-amount{font-size:28px;font-weight:700;color:var(--danger)}.balance-list{display:flex;flex-direction:column;gap:8px;padding-bottom:20px}.balance-card{display:flex;align-items:center;justify-content:space-between;padding:14px 16px}.balance-main{display:flex;align-items:center;gap:12px}.balance-info{display:flex;flex-direction:column;gap:2px}.balance-name{font-size:15px;font-weight:600}.balance-detail{font-size:12px;color:var(--text-secondary)}.balance-net{font-size:18px;font-weight:700;min-width:80px;text-align:right}.balance-net.positive{color:var(--success)}.balance-net.negative{color:var(--danger)}.balance-net.neutral{color:var(--text-tertiary)}.add-member-card{padding:14px}.inline-form{display:flex;gap:10px;align-items:center}.inline-form .glass-input{flex:1}.member-list{display:flex;flex-direction:column;gap:8px}.member-card{display:flex;align-items:center;gap:12px;padding:12px 16px}.member-card.selectable{cursor:pointer}.member-card.selectable:active{transform:scale(.98)}.member-card.selected{border-color:var(--accent);background:var(--accent-light)}.member-avatar{width:40px;height:40px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:600;flex-shrink:0;background:linear-gradient(135deg,#c4b5fd,#93c5fd);color:#fff}.member-name{flex:1;font-size:16px;font-weight:500;display:flex;align-items:center}.share-code-box{display:flex;align-items:center;gap:12px;padding:16px;background:#ffffff80;border-radius:var(--radius-sm);margin-bottom:16px}.share-label{font-size:13px;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.3px}.share-code{font-size:28px;font-weight:700;letter-spacing:4px;color:var(--accent);flex:1;text-align:center;font-family:SF Mono,Fira Code,monospace}.share-link-section{margin-bottom:16px}.share-link-section 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.date-icon{position:absolute;right:14px;pointer-events:none;color:var(--text-secondary)}input[type=date].date-input::-webkit-calendar-picker-indicator{opacity:0;position:absolute;top:0;left:0;width:100%;height:100%;cursor:pointer}input[type=date]::-webkit-datetime-edit{border-radius:var(--radius-xs)}input[type=date]::-webkit-datetime-edit-fields-wrapper{border-radius:var(--radius-xs)}.form-hint{display:block;font-size:12px;color:var(--text-tertiary);margin-top:4px}.rate-hint{padding:8px 14px;margin-bottom:16px;border-radius:var(--radius-xs);background:var(--accent-light);color:var(--accent);font-size:14px;font-weight:500}.rate-source{font-size:12px;color:var(--text-tertiary);margin-left:6px}.split-type-toggle{display:flex;gap:4px;padding:3px;background:#fff6;border-radius:var(--radius-xs);border:1px solid rgba(255,255,255,.3)}.toggle-btn{flex:1;padding:10px 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#ff3b304d}.icon-btn{width:36px;height:36px;border:none;background:transparent;border-radius:50%;display:flex;align-items:center;justify-content:center;cursor:pointer;transition:all .2s;color:var(--text-tertiary);flex-shrink:0}.icon-btn:hover{background:#0000000d}.icon-btn.danger{color:var(--danger)}.icon-btn.danger:hover{background:var(--danger-light)}.bottom-bar{position:fixed;bottom:0;left:50%;transform:translate(-50%);width:100%;max-width:480px;z-index:60;display:flex;align-items:center;justify-content:space-around;height:calc(var(--bottombar-h) + var(--safe-bottom));padding-bottom:var(--safe-bottom);background:#ffffffe0;backdrop-filter:blur(40px) saturate(180%);-webkit-backdrop-filter:blur(40px) saturate(180%);border-top:.5px solid rgba(0,0,0,.1);border-radius:var(--radius) var(--radius) 0 0;box-shadow:0 -4px 24px #00000014}.bottom-tab{display:flex;flex-direction:column;align-items:center;gap:2px;padding:8px 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rgba(255,255,255,.5)}@media(max-width:520px){.fab-group{right:20px}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#00000040;backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);display:flex;align-items:flex-end;justify-content:center;animation:fadeIn .2s ease}.modal-sheet{width:100%;max-width:480px;max-height:90vh;max-height:90dvh;overflow-y:auto;border-radius:var(--radius) var(--radius) 0 0;padding:12px 24px calc(24px + var(--safe-bottom));animation:slideUp .35s cubic-bezier(.25,.46,.45,.94);background:#ffffffd1;backdrop-filter:blur(40px);-webkit-backdrop-filter:blur(40px)}.modal-sheet.large{max-height:92vh;max-height:92dvh}.modal-handle{width:36px;height:5px;border-radius:3px;background:#00000026;margin:0 auto 16px}.modal-title{font-size:22px;font-weight:700;margin-bottom:20px;text-align:center}.modal-actions{display:flex;gap:12px;margin-top:24px}.modal-actions .glass-btn{flex:1}.empty-state{text-align:center;padding:60px 20px;color:var(--text-secondary)}.empty-state.small{padding:30px 20px}.empty-icon{font-size:48px;margin-bottom:12px}.empty-state h3{font-size:18px;font-weight:600;margin-bottom:6px;color:var(--text)}.empty-state p{font-size:14px}.loading-state{display:flex;align-items:center;justify-content:center;min-height:60vh}.loading-spinner{width:36px;height:36px;border:3px solid rgba(0,122,255,.15);border-top-color:var(--accent);border-radius:50%;animation:spin .8s linear infinite}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes slideUp{0%{transform:translateY(100%)}to{transform:translateY(0)}}@keyframes spin{to{transform:rotate(360deg)}}@media(max-width:520px){.app-content{padding:0 12px 12px}.page-title{font-size:28px}.summary-amount{font-size:36px}.glass-card{padding:14px;border-radius:var(--radius-sm)}.modal-sheet{padding:12px 18px calc(20px + var(--safe-bottom))}.settlement-arrow{gap:10px}.settlement-amount{font-size:24px}}::-webkit-scrollbar{width:0;height:0}::selection{background:var(--accent-light);color:var(--accent)}