:root{--bg:#F2F2F7;--card:#fff;--primary:#007AFF;--text:#1C1C1E;--sub:#8E8E93;--muted:#AEAEB2;--border:#F2F2F7;--danger:#FF3B30;--ease:cubic-bezier(0.4,0,0.2,1)}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:var(--tg-vh,100vh);max-height:var(--tg-vh,100vh);font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","Helvetica Neue",sans-serif;font-size:16px;color:var(--text);background:var(--bg);overflow:hidden;-webkit-font-smoothing:antialiased;position:fixed;width:100%;}
button{border:none;background:none;cursor:pointer;font:inherit;color:inherit}
input,select{font:inherit}
#app{height:100%;width:100%;display:flex;flex-direction:column;position:relative;overflow:hidden}

/* Screens */
.screen{display:none;flex-direction:column;flex:1;overflow:hidden;padding:0 16px}
.screen.active{display:flex}
.screen-hdr{display:flex;align-items:center;justify-content:space-between;padding:14px 0;flex-shrink:0;background:var(--bg)}
.screen-ttl{font-size:28px;font-weight:700;letter-spacing:-.4px}
.scroll{flex:1;overflow-y:auto;overflow-x:hidden;padding-bottom:80px;-webkit-overflow-scrolling:touch}

/* Tab bar */
.tab-bar{display:flex;justify-content:space-around;align-items:flex-start;padding:6px 0 12px;padding-bottom:calc(12px + env(safe-area-inset-bottom, 0px));background:var(--card);border-top:1px solid #F5F5F5;flex-shrink:0}
.tab{display:flex;flex-direction:column;align-items:center;gap:2px;padding:4px 6px;min-width:0;flex:1;color:var(--muted);transition:color .35s var(--ease)}
.tab.on{color:var(--primary)}
.tab svg{transition:transform .35s var(--ease)}
.tab.on svg{transform:translateY(-1px)}
.tab span{font-size:10px;font-weight:500}
.tab.on span{font-weight:600}

/* FAB */
.fab{position:fixed;bottom:calc(env(safe-area-inset-bottom,0px) + 80px);right:20px;width:56px;height:56px;border-radius:16px;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 20px rgba(0,122,255,.3);z-index:200}

/* Habit card grid */
.habit-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px;overflow:hidden}
.habit-card{border-radius:14px;padding:16px;cursor:pointer;min-height:150px;min-width:0;display:flex;flex-direction:column;justify-content:space-between;opacity:0;transform:translateY(5px);transition:opacity .4s var(--ease),transform .4s var(--ease)}
.habit-card.show{opacity:1;transform:translateY(0)}

/* Empty state */
.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;gap:8px;text-align:center;padding:32px}
.empty-icon{font-size:48px;margin-bottom:8px;opacity:.7}
.empty-title{font-size:18px;font-weight:600;color:#3C3C43}
.empty-sub{font-size:14px;color:var(--muted);max-width:240px;line-height:1.5}

/* Detail */
.detail-hdr{display:flex;align-items:center;padding:12px 16px;flex-shrink:0;background:var(--bg)}
.back-btn{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:#fff;box-shadow:0 1px 4px rgba(0,0,0,.08);color:var(--primary)}
.detail-title{flex:1;text-align:center;font-size:18px;font-weight:700}
.act-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:14px 0;background:#fff;border-radius:12px;font-size:15px;font-weight:500;color:var(--primary);border:1px solid #F0F0F0;transition:background .3s var(--ease)}
.detail-card{background:#fff;border-radius:14px;padding:20px;margin-bottom:14px;border:1px solid #F0F0F5}
.detail-card h3{font-size:20px;font-weight:700;margin-bottom:16px}
.stat-row{display:flex;justify-content:space-between;align-items:center;padding:10px 0;border-bottom:1px solid #F5F5F7;font-size:15px}
.stat-row:last-child{border-bottom:none}
.stat-label{color:var(--sub)}
.stat-value{font-weight:600}

/* Overlay / Modal */
.overlay{position:fixed;top:0;left:0;width:100%;height:100%;z-index:100;display:none;align-items:flex-end;background:rgba(0,0,0,.25);backdrop-filter:blur(4px);-webkit-backdrop-filter:blur(4px)}
.overlay.open{display:flex}
.modal{width:100%;background:#fff;border-radius:18px 18px 0 0;display:flex;flex-direction:column;animation:slideUp .35s var(--ease)}
.modal-head{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid #F5F5F5;flex-shrink:0}
.modal-body{flex:1;overflow-y:auto;padding:0 20px 24px}

/* Confirm popup */
.confirm-overlay{position:fixed;top:0;left:0;right:0;bottom:0;z-index:200;display:none;align-items:center;justify-content:center;background:rgba(0,0,0,.3);backdrop-filter:blur(4px)}
.confirm-overlay.open{display:flex}
.confirm-box{background:#fff;border-radius:16px;padding:28px 24px 20px;width:85%;max-width:320px;text-align:center;animation:fadeIn .25s ease both}
.confirm-msg{font-size:17px;font-weight:600;line-height:1.4;margin-bottom:20px}
.confirm-btns{display:flex;gap:10px}
.confirm-btns button{flex:1;padding:14px 0;border-radius:12px;font-size:15px;font-weight:600}

/* Form */
.f-label{display:block;font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.4px;margin:20px 0 8px}
.f-section{font-size:18px;font-weight:700;margin:28px 0 12px;color:var(--text)}
.f-input{width:100%;padding:14px 16px;border:1px solid var(--border);border-radius:10px;font-size:17px;outline:none;background:#FAFAFA;color:var(--text);box-sizing:border-box;transition:border-color .3s var(--ease)}
.f-input:focus{border-color:var(--primary)}
.f-hint{font-size:13px;color:var(--sub);line-height:1.55;margin-top:0}
.chip-row{display:flex;gap:8px;overflow-x:auto;padding-bottom:4px}
.chip{flex-shrink:0;padding:8px 14px;border-radius:20px;border:1px solid var(--border);font-size:14px;font-weight:500;white-space:nowrap;transition:all .3s var(--ease)}
.chip.on{background:rgba(0,122,255,.1);border-color:var(--primary);color:var(--primary)}
.days-row{display:flex;gap:8px}
.day-btn{width:42px;height:42px;border-radius:50%;font-size:16px;font-weight:600;display:flex;align-items:center;justify-content:center;border:1.5px solid #E5E5EA;transition:all .3s var(--ease)}
.color-row{display:flex;flex-wrap:wrap;gap:12px}
.color-dot{width:40px;height:40px;border-radius:50%;border:3px solid transparent;position:relative;display:flex;align-items:center;justify-content:center;transition:all .25s var(--ease)}
.color-dot.on{border-color:#1C1C1E;box-shadow:inset 0 0 0 2px #fff}

/* Settings blocks */
.s-block{background:#fff;border-radius:14px;padding:16px 20px;margin-bottom:12px}
.s-label{font-size:12px;font-weight:600;color:var(--muted);text-transform:uppercase;letter-spacing:.4px;margin-bottom:10px}
.seg{display:flex;background:var(--bg);border-radius:8px;padding:3px}
.seg button{flex:1;padding:8px 14px;border-radius:6px;font-size:14px;font-weight:500;color:var(--sub);transition:all .3s var(--ease)}
.seg button.on{background:#fff;color:var(--text);font-weight:600;box-shadow:0 1px 4px rgba(0,0,0,.06)}

/* Toast */
.toast{position:fixed;bottom:100px;left:50%;transform:translateX(-50%) translateY(20px);background:#1C1C1E;color:#fff;padding:12px 24px;border-radius:12px;font-size:14px;font-weight:500;opacity:0;transition:all .35s var(--ease);pointer-events:none;z-index:300;white-space:nowrap}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Onboarding */
.onboard{position:absolute;inset:0;z-index:500;display:flex;flex-direction:column;background:var(--bg)}
.onboard-dots{display:flex;gap:8px;justify-content:center;padding-top:22px}
.onboard-dot{width:24px;height:4px;border-radius:2px;transition:background .4s var(--ease)}
.onboard-content{flex:1;display:flex;align-items:center;justify-content:center;padding:32px;text-align:center}
.onboard-slide{display:flex;flex-direction:column;align-items:center;animation:fadeIn .4s ease both}
.onboard-icon{width:96px;height:96px;border-radius:24px;display:flex;align-items:center;justify-content:center;font-size:44px;margin-bottom:28px}
.onboard-title{font-size:24px;font-weight:700;margin-bottom:10px}
.onboard-text{font-size:15px;line-height:1.6;color:var(--sub);max-width:260px}
.onboard-cta{width:100%;padding:16px 0;border-radius:14px;background:var(--primary);color:#fff;font-size:17px;font-weight:600}

/* Profile card */
.profile-card{display:flex;align-items:center;gap:16px}
.avatar{width:52px;height:52px;border-radius:50%;background:linear-gradient(145deg,#007AFF,#5AC8FA);display:flex;align-items:center;justify-content:center;color:#fff;font-size:22px;font-weight:700;flex-shrink:0;overflow:hidden}
.avatar img{width:100%;height:100%;object-fit:cover}

/* Past dates */
.past-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;border-bottom:1px solid #F7F7F7}
.past-check{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;border:2px solid #E5E5EA;transition:all .3s var(--ease)}
.past-check.on{color:#fff}

/* Delete row */
.del-btn{width:100%;padding:14px 0;border-radius:12px;background:#FFF5F5;color:var(--danger);font-size:15px;font-weight:600;display:flex;align-items:center;justify-content:center;gap:6px;margin-top:4px}

/* Heatmap */
.heatmap{display:grid;gap:4px}
.heat-cell{aspect-ratio:1;border-radius:4px;transition:background .35s var(--ease)}
.year-months{display:grid;grid-template-columns:1fr 1fr 1fr;gap:20px}
.mini-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:3px}
.mini-cell{aspect-ratio:1;border-radius:2.5px;transition:background .35s var(--ease)}

/* Week dots on card */
.week-dots{display:flex;align-items:center;gap:3px;margin-top:10px}
.wd-col{display:flex;flex-direction:column;align-items:center;gap:3px}
.wd-label{font-size:7px;font-weight:600;transition:color .3s var(--ease)}
.wd-dot{width:14px;height:14px;border-radius:50%;transition:all .35s var(--ease)}

/* Animations */
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes slideUp{from{transform:translateY(100%)}to{transform:translateY(0)}}

/* Upgrade banner (Today screen) */
.upgrade-banner{width:100%;display:flex;align-items:center;gap:10px;padding:14px 16px;background:linear-gradient(135deg,rgba(0,122,255,.08),rgba(255,149,0,.08));border-radius:14px;margin-bottom:14px;cursor:pointer;border:1px solid rgba(0,122,255,.12);transition:all .3s var(--ease)}
.upgrade-star{font-size:20px}
.upgrade-text{flex:1;font-size:14px;font-weight:600;color:var(--primary);text-align:left}
.upgrade-banner svg{color:var(--primary);opacity:.5}

/* Locked habit card */
.habit-card.locked{pointer-events:auto;filter:grayscale(.3)}

/* Landing page */
.landing-hero{text-align:center;padding:32px 24px 24px;background:linear-gradient(180deg,#fff 0%,var(--bg) 100%)}
.landing-photo{width:100px;height:100px;border-radius:50%;overflow:hidden;margin:0 auto 16px;box-shadow:0 4px 20px rgba(0,0,0,.1);border:3px solid #fff}
.landing-photo img{width:100%;height:100%;object-fit:cover}
.landing-badge{display:inline-block;padding:6px 14px;border-radius:20px;background:rgba(255,149,0,.1);color:#FF9500;font-size:12px;font-weight:600;letter-spacing:.3px;margin-bottom:16px}
.landing-title{font-size:26px;font-weight:800;letter-spacing:-.5px;color:var(--text);margin-bottom:10px;line-height:1.2}
.landing-sub{font-size:15px;line-height:1.6;color:var(--sub);max-width:320px;margin:0 auto}

.landing-section{padding:20px 24px}
.landing-section-title{font-size:18px;font-weight:700;margin-bottom:14px;color:var(--text)}
.landing-features{display:flex;flex-direction:column;gap:12px}
.landing-feature{font-size:14px;line-height:1.55;color:#3C3C43;padding:12px 16px;background:#fff;border-radius:12px;border:1px solid #F0F0F5}

.landing-steps{display:flex;flex-direction:column;gap:10px}
.landing-step{display:flex;align-items:center;gap:14px;padding:12px 16px;background:#fff;border-radius:12px;border:1px solid #F0F0F5}
.step-num{width:32px;height:32px;border-radius:50%;background:var(--primary);color:#fff;display:flex;align-items:center;justify-content:center;font-size:15px;font-weight:700;flex-shrink:0}
.step-text{font-size:14px;font-weight:500;color:var(--text)}

.landing-offer{font-size:14px;line-height:1.6;color:var(--sub);padding:16px;background:rgba(255,149,0,.06);border-radius:12px;border-left:4px solid #FF9500}

.landing-cta-block{padding:24px;text-align:center}
.landing-cta-text{font-size:16px;font-weight:600;color:var(--text);line-height:1.5;margin-bottom:20px}
.landing-cta-btn{width:100%;padding:18px 0;border-radius:14px;background:var(--primary);color:#fff;font-size:17px;font-weight:700;letter-spacing:.2px;cursor:pointer;transition:all .35s var(--ease);box-shadow:0 4px 16px rgba(0,122,255,.25)}
.landing-cta-btn:active{transform:scale(.98)}
.landing-cta-btn.subscribed{background:#34C759;box-shadow:none;cursor:default}
.landing-expires{margin-top:10px;font-size:13px;color:var(--sub)}

/* Landing habit preview cards */
.landing-habits-preview{display:flex;flex-direction:column;gap:10px}
.landing-habit-card{display:flex;align-items:center;gap:14px;padding:14px 16px;background:#fff;border-radius:12px;border:1px solid #F0F0F5}
.lhc-emoji{font-size:28px;flex-shrink:0}
.lhc-info{flex:1}
.lhc-name{font-size:15px;font-weight:700;color:#1C1C1E}
.lhc-desc{font-size:13px;color:#8E8E93;margin-top:2px}