/* ── THEME: Classic (Navy + White) ── */
:root, [data-theme="classic"] {
  --bg:#eef2ff; --surface:#ffffff; --surface2:#e8eeff; --surface3:#d0dbff;
  --accent:#00143c; --accent2:#0038a8; --green:#007a5e; --red:#cc2233;
  --text:#00091a; --muted:#5a6e8a; --border:rgba(0,20,60,0.1);
  --radius:16px; --radius-sm:10px;
  --grad-start:#00143c; --grad-end:#0038a8;
  --card-glass:rgba(255,255,255,0.9); --card-border:rgba(0,20,60,0.1);
}
/* ── THEME: Purple Haze ── */
[data-theme="purple"] {
  --bg:#0d0d1a; --surface:rgba(255,255,255,0.07); --surface2:rgba(255,255,255,0.05); --surface3:rgba(255,255,255,0.03);
  --accent:#7c3aed; --accent2:#ec4899; --green:#10b981; --red:#f43f5e;
  --text:#ffffff; --muted:rgba(255,255,255,0.5); --border:rgba(255,255,255,0.1);
  --radius:16px; --radius-sm:10px;
  --grad-start:#7c3aed; --grad-end:#ec4899;
  --card-glass:rgba(124,58,237,0.08); --card-border:rgba(124,58,237,0.2);
}
/* ── THEME: Ocean Cyan ── */
[data-theme="ocean"] {
  --bg:#030d1a; --surface:rgba(255,255,255,0.06); --surface2:rgba(255,255,255,0.04); --surface3:rgba(255,255,255,0.02);
  --accent:#06b6d4; --accent2:#3b82f6; --green:#10b981; --red:#f43f5e;
  --text:#ffffff; --muted:rgba(255,255,255,0.5); --border:rgba(6,182,212,0.2);
  --radius:16px; --radius-sm:10px;
  --grad-start:#06b6d4; --grad-end:#3b82f6;
  --card-glass:rgba(6,182,212,0.08); --card-border:rgba(6,182,212,0.2);
}
/* ── THEME: Emerald Night ── */
[data-theme="emerald"] {
  --bg:#030f0a; --surface:rgba(255,255,255,0.06); --surface2:rgba(255,255,255,0.04); --surface3:rgba(255,255,255,0.02);
  --accent:#10b981; --accent2:#06b6d4; --green:#10b981; --red:#f43f5e;
  --text:#ffffff; --muted:rgba(255,255,255,0.5); --border:rgba(16,185,129,0.2);
  --radius:16px; --radius-sm:10px;
  --grad-start:#10b981; --grad-end:#06b6d4;
  --card-glass:rgba(16,185,129,0.08); --card-border:rgba(16,185,129,0.2);
}
/* ── THEME: Sunset Amber ── */
[data-theme="sunset"] {
  --bg:#0f0a00; --surface:rgba(255,255,255,0.06); --surface2:rgba(255,255,255,0.04); --surface3:rgba(255,255,255,0.02);
  --accent:#f59e0b; --accent2:#ef4444; --green:#10b981; --red:#f43f5e;
  --text:#ffffff; --muted:rgba(255,255,255,0.5); --border:rgba(245,158,11,0.2);
  --radius:16px; --radius-sm:10px;
  --grad-start:#f59e0b; --grad-end:#ef4444;
  --card-glass:rgba(245,158,11,0.08); --card-border:rgba(245,158,11,0.2);
}
*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}
body{font-family:'DM Sans',sans-serif;background:var(--bg);color:var(--text);min-height:100dvh;max-width:480px;margin:0 auto;overflow-x:hidden}
h1,h2,h3{font-family:'Syne',sans-serif}

/* SCREENS */
.screen{display:none;min-height:100dvh;flex-direction:column}
.screen.active{display:flex}

/* AUTH SCREEN */
#authScreen{
  align-items:center;justify-content:center;
  background:linear-gradient(160deg,#00143c 0%,#0038a8 40%,#eef2ff 100%);
  padding:40px 28px;text-align:center;
}
.auth-logo{width:100px;height:100px;border-radius:28px;
  background:linear-gradient(135deg,var(--grad-start),var(--grad-end));
  display:flex;align-items:center;justify-content:center;
  font-size:48px;margin:0 auto 24px;
  box-shadow:0 20px 60px rgba(255,107,53,.4);
}
.auth-title{font-size:36px;font-weight:800;letter-spacing:-1px;margin-bottom:8px;color:#ffffff}
.auth-title span{color:#a8d4ff}
.auth-sub{color:rgba(255,255,255,0.75);font-size:14px;line-height:1.6;margin-bottom:40px}
.google-btn{
  display:flex;align-items:center;justify-content:center;gap:12px;
  width:100%;padding:16px 24px;border-radius:var(--radius);
  background:#ffffff;color:#001433;border:none;cursor:pointer;
  font-family:'Syne',sans-serif;font-size:16px;font-weight:700;
  transition:transform .15s,box-shadow .15s;
  box-shadow:0 4px 20px rgba(0,0,0,.3);
}
.google-btn:active{transform:scale(0.97)}
.google-btn:hover{box-shadow:0 6px 30px rgba(0,0,0,.4)}
.google-btn img{width:24px;height:24px}
.auth-divider{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--muted);font-size:12px}
.auth-divider::before,.auth-divider::after{content:'';flex:1;height:1px;background:var(--border)}
.auth-terms{font-size:11px;color:rgba(255,255,255,0.6);margin-top:20px;line-height:1.7}
.auth-terms a{color:#a8d4ff;text-decoration:none}

/* BUTTONS */
.btn{display:flex;align-items:center;justify-content:center;gap:8px;
  padding:16px 24px;border-radius:var(--radius);border:none;cursor:pointer;
  font-family:'Syne',sans-serif;font-size:15px;font-weight:700;
  transition:all .2s ease;width:100%;text-decoration:none;box-shadow:0 4px 12px rgba(0,0,0,0.1)}
.btn:active{transform:scale(0.98)}
.btn:hover{transform:translateY(-2px);box-shadow:0 6px 16px rgba(0,0,0,0.15)}
.btn-primary{background:linear-gradient(135deg,var(--grad-start),var(--grad-end));color:#ffffff;font-weight:700;box-shadow:0 8px 20px rgba(0,0,0,0.2)}
.btn-primary:hover{box-shadow:0 10px 24px rgba(0,0,0,0.28)}
.btn-secondary{background:var(--surface);color:var(--text);border:1.5px solid var(--border);box-shadow:0 2px 6px rgba(0,0,0,0.05)}
.btn-ghost{background:transparent;color:var(--accent2);font-weight:400;font-family:'DM Sans',sans-serif}
.btn-green{background:var(--green);color:#fff}
.btn-red{background:rgba(255,71,87,.15);color:var(--red);border:1px solid rgba(255,71,87,.3)}
.btn-sm{padding:10px 16px;font-size:13px;width:auto;border-radius:var(--radius-sm)}
.btn-stack{display:flex;flex-direction:column;gap:12px;width:100%}

/* FORMS */
.form-group{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}
label{font-size:13px;color:var(--muted);font-weight:500;letter-spacing:.5px;text-transform:uppercase}
input,textarea{background:var(--surface2);border:1.5px solid var(--border);border-radius:var(--radius-sm);
  color:var(--text);font-family:'DM Sans',sans-serif;font-size:15px;
  padding:14px 16px;outline:none;transition:border-color .2s;width:100%}
input:focus,textarea:focus{border-color:var(--accent);background:var(--surface)}
input::placeholder,textarea::placeholder{color:var(--muted)}

/* HEADER */
.header{display:flex;align-items:center;justify-content:space-between;
  padding:14px 20px;background:var(--surface);border-bottom:1px solid var(--border);
  position:sticky;top:0;z-index:10;box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.avatar-btn{width:38px;height:38px;border-radius:50%;border:2px solid var(--accent);
  cursor:pointer;overflow:hidden;display:flex;align-items:center;justify-content:center;
  font-size:16px;font-family:'Syne',sans-serif;font-weight:700;color:#fff;
  background:linear-gradient(135deg,var(--grad-start),var(--grad-end));flex-shrink:0;
  transition:all .2s ease;box-shadow:0 4px 12px rgba(0,0,0,0.15)}
.avatar-btn:hover{transform:scale(1.05);box-shadow:0 6px 16px rgba(0,0,0,0.2)}
.avatar-btn img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.back-btn{background:none;border:none;color:var(--text);cursor:pointer;
  font-size:20px;padding:4px;display:flex;align-items:center;transition:all .2s}
.back-btn:hover{transform:scale(1.1);color:var(--accent)}
.header-title{font-family:'Syne',sans-serif;font-weight:700;font-size:17px;flex:1;text-align:center}

/* CONTENT */
.content{flex:1;overflow-y:auto;padding:20px}
.content-padded{padding:24px}

/* TAB BAR */
.tab-bar{display:flex;background:var(--surface);border-bottom:1px solid var(--border);padding:0}
.tab{flex:1;display:flex;flex-direction:column;align-items:center;gap:3px;
  padding:10px 4px 8px;background:none;border:none;
  border-bottom:2px solid transparent;cursor:pointer;
  color:var(--muted);font-weight:500;font-size:10px;font-family:'DM Sans',sans-serif;
  font-weight:500;transition:color .2s,border-color .2s;margin-bottom:-1px}
.tab.active{color:var(--accent);border-bottom-color:var(--accent)}
.tab-icon{font-size:18px;line-height:1}

/* CARDS */
.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;margin-bottom:14px;
  box-shadow:0 4px 12px rgba(0,0,0,0.08);transition:all .2s ease}
.card:hover{box-shadow:0 6px 16px rgba(0,0,0,0.12)}

/* GROUP CARDS */
.group-card{background:var(--surface);border:1px solid var(--border);box-shadow:0 3px 10px rgba(0,0,0,0.08);border-radius:var(--radius);
  padding:18px 20px;margin-bottom:12px;display:flex;align-items:center;gap:16px;cursor:pointer;
  transition:all .2s ease}
.group-card:active{transform:scale(0.98)}
.group-card:hover{border-color:var(--accent);box-shadow:0 6px 16px rgba(0,0,0,0.12);transform:translateY(-2px)}
.group-emoji{font-size:36px;flex-shrink:0}
.group-info{flex:1}
.group-name{font-family:'Syne',sans-serif;font-weight:700;font-size:16px;margin-bottom:4px}
.group-desc{font-size:13px;color:var(--muted)}
.delete-trip-btn{background:none;border:none;color:var(--muted);font-size:20px;cursor:pointer;
  padding:6px;line-height:1;border-radius:8px;flex-shrink:0}

/* CHECKLIST */
.checklist-item{display:flex;align-items:center;gap:14px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;
  margin-bottom:10px;transition:opacity .3s}
.checklist-item.done{opacity:.55}
.check-circle{width:26px;height:26px;border-radius:50%;border:2px solid var(--muted);
  display:flex;align-items:center;justify-content:center;flex-shrink:0;
  transition:all .2s;font-size:13px;cursor:pointer}
.checklist-item.done .check-circle{background:var(--accent);border-color:var(--accent)}
.check-text{flex:1;cursor:pointer}
.check-label{font-size:15px;transition:all .2s}
.checklist-item.done .check-label{text-decoration:line-through;color:var(--muted)}
.check-who{font-size:12px;color:var(--muted);margin-top:2px}
.qty-badge{font-size:12px;padding:3px 10px;border-radius:99px;
  background:rgba(77,159,255,0.15);color:var(--accent2);font-weight:600;flex-shrink:0}

/* FLOATING ACTION BUTTON */
.fab-container{position:fixed;bottom:max(16px,calc(16px + env(safe-area-inset-bottom)));right:max(16px,calc(16px + env(safe-area-inset-right)));z-index:1001;pointer-events:auto;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:0;width:70px;height:70px}
.fab{width:70px;height:70px;border-radius:50%;background:linear-gradient(135deg,var(--grad-start),var(--grad-end));
  border:3px solid #ffffff;color:#fff;font-size:38px;cursor:pointer;display:flex;align-items:center;justify-content:center;line-height:1;
  box-shadow:0 10px 28px rgba(0,0,0,0.32);transition:all .3s cubic-bezier(.32,.72,0,1);
  font-family:'Syne',sans-serif;font-weight:800;position:relative;
  -webkit-appearance:none;-moz-appearance:none;appearance:none;
  padding:0;margin:0;box-sizing:border-box;flex-shrink:0;outline:none;touch-action:manipulation}
.fab:focus{outline:none}
.fab:active{transform:scale(0.86)}
.fab:hover{transform:scale(1.12);box-shadow:0 14px 36px rgba(0,0,0,0.40)}
.fab.hidden{display:none !important;pointer-events:none}

/* ADD BAR */
.add-bar{display:flex;gap:10px;background:var(--surface);border-top:1px solid var(--border);
  padding:12px 16px;padding-bottom:max(12px,env(safe-area-inset-bottom))}

/* ITINERARY */
.day-block{margin-bottom:20px}
.day-label{display:flex;align-items:center;gap:10px;font-family:'Syne',sans-serif;
  font-weight:700;font-size:14px;color:var(--accent2);margin-bottom:12px;
  letter-spacing:.5px;text-transform:uppercase}
.day-label::after{content:'';flex:1;height:1px;background:var(--border)}
.event-item{display:flex;gap:14px;margin-bottom:12px}
.event-time-col{display:flex;flex-direction:column;align-items:center;width:48px;flex-shrink:0}
.event-time{font-size:12px;color:var(--muted);font-weight:500;text-align:center}
.event-dot{width:10px;height:10px;border-radius:50%;background:var(--accent);margin:6px 0;
  box-shadow:0 0 0 3px rgba(0,20,60,.1)}
.event-line{flex:1;width:2px;background:var(--border);min-height:20px}
.event-card{flex:1;background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-sm);padding:12px 14px;margin-bottom:4px}
.event-card-title{font-weight:600;font-size:14px;margin-bottom:3px}
.event-card-note{font-size:12px;color:var(--muted)}

/* INVITE */
.invite-box{background:var(--surface2);border:1.5px dashed var(--border);
  border-radius:var(--radius);padding:20px;text-align:center;margin-bottom:20px}
.invite-box p{font-size:14px;color:var(--muted);margin-bottom:16px}
.invite-link{background:var(--surface2);border-radius:var(--radius-sm);padding:12px 16px;
  font-size:13px;color:var(--accent2);word-break:break-all;margin-bottom:14px;
  border:1px solid var(--border)}

/* MEMBERS */
.member-row-full{display:flex;align-items:center;gap:14px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:10px}
.member-avatar-lg{width:40px;height:40px;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-start),var(--grad-end));
  display:flex;align-items:center;justify-content:center;
  font-size:16px;font-weight:700;font-family:'Syne',sans-serif;color:#fff;flex-shrink:0;overflow:hidden}
.member-avatar-lg img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.member-info{flex:1}
.member-name{font-weight:600;font-size:15px}
.member-email{font-size:12px;color:var(--muted);margin-top:2px}
.member-badge{font-size:11px;padding:3px 10px;border-radius:99px}
.badge-admin{background:rgba(255,107,53,.2);color:var(--accent)}
.badge-member{background:rgba(255,255,255,.07);color:var(--muted)}

/* PROGRESS */
.progress-bar-bg{height:6px;background:var(--surface2);border-radius:99px;overflow:hidden}
.progress-bar-fill{height:100%;background:linear-gradient(90deg,var(--grad-start),var(--grad-end));
  border-radius:99px;transition:width .4s ease}
.progress-label{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin-top:6px}

/* SECTION HEADER */
.section-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px}
.section-title{font-family:'Syne',sans-serif;font-weight:700;font-size:16px}

/* MODAL */
.modal-overlay{display:none;position:fixed;inset:0;background:rgba(0,0,0,.6);
  z-index:100;align-items:flex-end;justify-content:center}
.modal-overlay.open{display:flex;animation:fadeIn .2s ease}
.modal{background:var(--surface);border-radius:24px 24px 0 0;border-top:1px solid var(--border);backdrop-filter:blur(20px);
  padding:24px 24px max(24px,env(safe-area-inset-bottom));
  width:100%;max-width:480px;animation:slideUp .3s cubic-bezier(.32,.72,0,1)}
.modal-handle{width:36px;height:4px;background:var(--border);border-radius:99px;margin:0 auto 20px}
.modal-title{font-family:'Syne',sans-serif;font-weight:800;font-size:20px;margin-bottom:20px}

/* TOAST */
.toast{position:fixed;bottom:80px;left:50%;transform:translateX(-50%) translateY(20px);
  background:#00143c;color:#ffffff;padding:12px 22px;border-radius:99px;
  font-size:14px;font-weight:500;opacity:0;transition:all .3s;pointer-events:none;
  z-index:200;white-space:nowrap;border:1px solid var(--border)}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* EMPTY STATE */
.empty-state{text-align:center;padding:40px 20px;color:var(--muted)}
.empty-icon{font-size:48px;margin-bottom:12px}
.empty-text{font-size:15px}

/* EXPENSES */
.expense-item{display:flex;align-items:center;gap:12px;background:var(--surface);
  border:1px solid var(--border);border-radius:var(--radius-sm);padding:12px 14px;margin-bottom:10px}
.expense-avatar{width:36px;height:36px;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-start),var(--grad-end));
  display:flex;align-items:center;justify-content:center;
  font-size:13px;font-weight:700;font-family:'Syne',sans-serif;color:#fff;flex-shrink:0;overflow:hidden}
.expense-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}
.expense-info{flex:1;min-width:0}
.expense-label{font-size:14px;font-weight:600;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.expense-meta{font-size:12px;color:var(--muted);margin-top:2px}
.expense-amount{font-size:15px;font-weight:700;color:var(--text);flex-shrink:0}
.split-row{display:flex;align-items:center;justify-content:space-between;
  padding:10px 0;border-bottom:1px solid var(--border)}
.split-row:last-child{border-bottom:none}
.split-badge{font-size:12px;font-weight:700;padding:4px 12px;border-radius:99px}
.badge-owes{background:rgba(255,71,87,.15);color:var(--red)}
.badge-gets{background:rgba(6,214,160,.15);color:var(--green)}
.badge-even{background:rgba(136,136,170,.15);color:var(--muted)}
.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px;flex:1}
.stat-label{font-size:12px;color:var(--muted);margin-bottom:4px}
.stat-value{font-size:22px;font-weight:700;font-family:'Syne',sans-serif}
.settlement-note{font-size:12px;color:var(--muted);margin-top:12px;padding-top:12px;
  border-top:1px solid var(--border);line-height:1.6}

/* MEMBER CHIPS */
.member-chip-select{display:flex;align-items:center;gap:8px;padding:8px 14px 8px 8px;
  border-radius:99px;border:2px solid var(--border);background:var(--surface2);
  cursor:pointer;transition:all .2s;font-size:14px;font-weight:600;color:var(--muted)}
.member-chip-select.selected{border-color:var(--accent);background:var(--surface2);color:var(--accent)}
.member-chip-select .chip-avatar{width:28px;height:28px;border-radius:50%;
  background:linear-gradient(135deg,var(--grad-start),var(--grad-end));
  display:flex;align-items:center;justify-content:center;
  font-size:11px;font-weight:700;color:#fff;flex-shrink:0;overflow:hidden}
.member-chip-select .chip-avatar img{width:100%;height:100%;object-fit:cover;border-radius:50%}

/* OFFLINE BANNER */
.offline-banner{display:none;background:#fff8e6;border-bottom:1px solid rgba(180,120,0,0.2);border-bottom:1px solid rgba(255,209,102,.3);
  padding:8px 16px;font-size:12px;color:var(--accent2);align-items:center;gap:8px;
  position:sticky;top:0;z-index:50}
.offline-banner.show{display:flex;color:#7a5a00}
.offline-dot{width:7px;height:7px;border-radius:50%;background:var(--accent2);
  flex-shrink:0;animation:blink 1.5s infinite}
@keyframes blink{0%,100%{opacity:1}50%{opacity:.3}}

/* SYNC DOT */
.sync-dot{width:8px;height:8px;border-radius:50%;background:var(--green);
  display:inline-block;margin-right:6px;box-shadow:0 0 0 0 rgba(6,214,160,.4);
  animation:pulse 2s infinite;box-shadow:0 0 0 0 rgba(0,122,94,.4)}
.sync-dot.offline{background:var(--muted);animation:none}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(6,214,160,.4)}50%{box-shadow:0 0 0 6px rgba(6,214,160,0)}}

/* STATUS PILL */
.status-pill{display:inline-flex;align-items:center;gap:6px;padding:6px 14px;
  border-radius:99px;font-size:13px;font-weight:600;font-family:'Syne',sans-serif}
.pill-planned{background:var(--surface2);color:var(--accent2)}

/* INSTALL BANNER */
.install-banner{background:rgba(0,32,96,0.4);
  border:1px solid rgba(77,159,255,0.2);border-radius:var(--radius);padding:16px;
  margin-bottom:16px;display:flex;align-items:center;gap:12px}
.install-banner-text{flex:1;font-size:13px;line-height:1.5}
.install-banner-text strong{display:block;font-size:14px;font-family:'Syne',sans-serif;margin-bottom:2px}

/* ACCOUNT SCREEN */
.account-section{background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);overflow:hidden;margin-bottom:16px;box-shadow:0 2px 8px rgba(0,0,0,0.06)}
.account-row{display:flex;align-items:center;gap:14px;padding:16px 20px;
  border-bottom:1px solid var(--border);cursor:pointer;transition:all .2s ease}
.account-row:last-child{border-bottom:none}
.account-row:active{background:var(--surface2);transform:scale(0.98)}
.account-row:hover{background:var(--surface2);padding-left:22px}
.account-row-icon{font-size:20px;width:32px;text-align:center;flex-shrink:0}
.account-row-text{flex:1}
.account-row-title{font-size:15px;font-weight:600;letter-spacing:-.3px}
.account-row-sub{font-size:12px;color:var(--muted);margin-top:2px}
.account-row-arrow{color:var(--muted);font-size:16px;transition:all .2s}
.account-row:hover .account-row-arrow{transform:translateX(2px)}

/* LOADING */
.loading{display:flex;align-items:center;justify-content:center;padding:40px;color:var(--muted);gap:10px}
.spinner{width:20px;height:20px;border:2px solid var(--border);border-top-color:var(--accent);
  border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ANIMATIONS */
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}
@keyframes popIn{from{transform:scale(0.5);opacity:0}to{transform:scale(1);opacity:1}}
@keyframes slideDown{from{transform:translateY(-100%)}to{transform:translateY(0)}}

.content{scrollbar-width:none}
.content::-webkit-scrollbar{display:none}

/* UPDATE NOTIFICATION */
#updateNotif{position:fixed;top:0;left:0;right:0;background:linear-gradient(135deg,var(--accent2),var(--accent));
  color:#fff;padding:14px 16px;text-align:center;font-weight:600;font-size:14px;display:none;z-index:1000;
  animation:slideDown .3s ease;box-shadow:0 6px 20px rgba(0,0,0,0.2)}