/* === 颜色变量 === */
:root {
  --c-primary: #3B82F6;
  --c-primary-light: #DBEAFE;
  --c-primary-dark: #1D4ED8;
  --c-bg: #F8FAFC;
  --c-white: #FFFFFF;
  --c-text: #1E293B;
  --c-secondary: #64748B;
  --c-hint: #94A3B8;
  --c-border: #E2E8F0;
  --c-danger: #EF4444;
  --c-success: #10B981;
  --c-warning: #F59E0B;
  --c-card: #FFFFFF;
  --c-gray-50: #F1F5F9;
  --c-gray-100: #E2E8F0;
  --radius: 12px;
  --shadow: 0 0 0 1px rgba(0,0,0,.03), 0 2px 8px rgba(0,0,0,.06);
  --nav-h: 60px;
  --header-h: 56px;
}

/* === Reset === */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;background:var(--c-bg);color:var(--c-text);line-height:1.5;overflow:hidden;height:100dvh}
input,select,textarea,button{font:inherit;color:inherit;border:1px solid var(--c-border);border-radius:8px;padding:.5rem .75rem;background:var(--c-white);font-size:.9rem}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--c-primary);box-shadow:0 0 0 3px rgba(59,130,246,.15)}
textarea{resize:vertical;min-height:60px}
button{cursor:pointer;border:none;background:none;padding:.5rem .75rem;font-size:.9rem}
a{color:var(--c-primary);text-decoration:none}
h1{font-size:1.5rem;font-weight:700}
h2{font-size:1.1rem;font-weight:600}
h3{font-size:1rem;font-weight:600}

/* === Layout === */
#app{max-width:480px;margin:0 auto;height:100dvh;display:flex;flex-direction:column;background:var(--c-white);position:relative;overflow:hidden}
.screen{display:none;flex-direction:column;flex:1;overflow:hidden}
.screen.active{display:flex}
.center{display:flex;align-items:center;justify-content:center;flex:1}
.scroll{overflow-y:auto;-webkit-overflow-scrolling:touch;flex:1}

/* === Page === */
.page{display:none;flex-direction:column;flex:1;overflow:hidden}
.page.active{display:flex}
.page-header{display:flex;align-items:center;justify-content:space-between;padding:.75rem 1rem;border-bottom:1px solid var(--c-border);min-height:var(--header-h);background:var(--c-white)}
.page-body{padding:.75rem 1rem;padding-bottom:1.5rem}
.page-footer{padding:.75rem 1rem;border-top:1px solid var(--c-border);background:var(--c-white)}

/* === Bottom Nav === */
.bottom-nav{display:flex;border-top:1px solid var(--c-border);min-height:var(--nav-h);background:var(--c-white);padding-bottom:env(safe-area-inset-bottom)}
.nav-item{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;color:var(--c-hint);font-size:.7rem;padding:.4rem 0;background:none;border:none;border-radius:0}
.nav-item.active{color:var(--c-primary)}
.nav-icon{font-size:1.3rem;line-height:1}

/* === Cards === */
.card{background:var(--c-card);border-radius:var(--radius);padding:1rem;box-shadow:var(--shadow);margin-bottom:.75rem}
.card-row{display:flex;align-items:center;gap:.75rem}
.card-icon{width:44px;height:44px;border-radius:12px;display:flex;align-items:center;justify-content:center;font-size:1.2rem;flex-shrink:0}
.card-icon.blue{background:var(--c-primary-light);color:var(--c-primary)}
.card-icon.green{background:#D1FAE5;color:#059669}
.card-icon.amber{background:#FEF3C7;color:#D97706}
.card-body{flex:1;min-width:0}
.card-title{font-weight:600;font-size:.95rem}
.card-sub{font-size:.8rem;color:var(--c-secondary);margin-top:2px}

/* === Buttons === */
.btn-primary{background:var(--c-primary);color:#fff;font-weight:600;padding:.6rem 1.2rem;border-radius:8px;text-align:center;display:inline-block;font-size:.9rem}
.btn-primary:active{background:var(--c-primary-dark)}
.btn-outline{background:var(--c-white);border:1px solid var(--c-border);color:var(--c-text)}
.btn-sm{font-size:.8rem;padding:.4rem .8rem}
.btn-icon{width:36px;height:36px;display:flex;align-items:center;justify-content:center;border-radius:8px;font-size:1rem}
.btn-back{font-size:.9rem;color:var(--c-secondary);padding:.3rem .5rem;border-radius:6px}
.btn-block{display:block;width:100%;margin-top:.75rem}
.danger{color:var(--c-danger)}

/* === Progress bar === */
.progress-bar{height:6px;background:var(--c-gray-100);border-radius:3px;overflow:hidden;margin:8px 0}
.progress-fill{height:100%;background:var(--c-primary);border-radius:3px;transition:width .3s}

/* === Streak === */
.streak-badge{display:inline-flex;align-items:center;gap:4px;font-size:.8rem;color:var(--c-warning);font-weight:600}

/* === Auth === */
.auth-page{max-width:340px;margin:auto;padding:2rem 1.5rem;flex:1;display:flex;flex-direction:column;justify-content:center}
.logo{text-align:center;margin-bottom:2rem}
.logo-icon{width:64px;height:64px;background:var(--c-primary);color:#fff;border-radius:18px;display:flex;align-items:center;justify-content:center;font-size:1.5rem;font-weight:700;margin:0 auto 1rem}
.sub{color:var(--c-secondary);font-size:.85rem;margin-top:.25rem}
.field{display:block;margin-bottom:1rem}
.field span{display:block;font-size:.8rem;font-weight:600;margin-bottom:.25rem;color:var(--c-secondary)}
.field input,.field select,.field textarea{width:100%}
.switch{text-align:center;margin-top:1.5rem;font-size:.85rem;color:var(--c-secondary)}
.switch a{font-weight:600}

/* === Auth page screen === */
#screen-login,#screen-register,#screen-pending{background:var(--c-bg)}

/* === Status === */
.status-done{color:var(--c-success);font-size:.8rem;font-weight:600}
.status-active{color:var(--c-primary);font-size:.8rem;font-weight:600}
.status-pending{color:var(--c-hint);font-size:.8rem}

/* === List items === */
.list-item{display:block;width:100%;text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--c-border);font-size:.9rem;background:var(--c-white)}
.list-item:last-child{border-bottom:none}

/* === Toast === */
#toast{position:fixed;top:1rem;left:50%;transform:translateX(-50%);z-index:999;background:var(--c-text);color:#fff;padding:.6rem 1.2rem;border-radius:8px;font-size:.85rem;pointer-events:none;opacity:0;transition:opacity .2s;white-space:nowrap}
#toast.show{opacity:1}
#toast.error{background:var(--c-danger)}

/* === Misc === */
.empty{text-align:center;padding:3rem 1rem;color:var(--c-hint)}
.empty-icon{font-size:3rem;margin-bottom:.5rem}
.tag{display:inline-block;padding:.15rem .5rem;border-radius:4px;font-size:.7rem;font-weight:600}
.tag-approved{background:#D1FAE5;color:#065F46}
.tag-pending{background:#FEF3C7;color:#92400E}
.tag-rejected{background:#FEE2E2;color:#991B1B}
.date-text{font-size:.85rem;color:var(--c-secondary)}
.select-sm{font-size:.8rem;padding:.25rem .5rem}
.spinner{width:36px;height:36px;border:3px solid var(--c-gray-100);border-top-color:var(--c-primary);border-radius:50%;animation:spin .6s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* === Progress === */
.goal-meta{display:flex;gap:.75rem;flex-wrap:wrap;font-size:.8rem;color:var(--c-secondary);margin-top:4px}
.meta-item{display:flex;align-items:center;gap:3px}
.checkin-card{border-left:3px solid var(--c-primary);padding-left:.75rem}
.score-big{font-size:2rem;font-weight:700;color:var(--c-primary)}
.feedback-text{font-size:.85rem;color:var(--c-secondary);line-height:1.6}

/* === Phase tasks === */
.phase-group{margin-bottom:1rem}
.phase-label{font-size:.8rem;font-weight:600;color:var(--c-secondary);padding:.3rem 0 .5rem}
.task-item{display:flex;align-items:flex-start;gap:.5rem;padding:.5rem .75rem;border-radius:8px;margin-bottom:4px;font-size:.85rem}
.task-item.done{background:var(--c-gray-50);color:var(--c-hint);text-decoration:line-through}
.task-item.active{border:1px solid var(--c-primary);background:var(--c-primary-light)}
.task-dot{width:8px;height:8px;border-radius:50%;margin-top:6px;flex-shrink:0}
.task-dot.done{background:var(--c-success)}
.task-dot.active{background:var(--c-primary)}
.task-dot.pending{background:var(--c-gray-100)}

/* === Responsive === */
@media(min-width:480px){#app{border-left:1px solid var(--c-border);border-right:1px solid var(--c-border)}}

/* === Pomodoro (两行布局，手机友好) === */
#pomodoro-bar{padding:.6rem 1rem .5rem;transition:background .3s}
.pomo-time-row{display:flex;align-items:center;justify-content:center;gap:.5rem;margin-bottom:.4rem}
.pomo-time-row .pomo-icon{font-size:1.2rem}
.pomo-time-row .pomo-time{font-size:1.5rem;font-weight:700;font-variant-numeric:tabular-nums;color:var(--c-primary)}
.pomo-time-row .pomo-label{font-size:.75rem;color:var(--c-secondary)}
.pomo-ctrl-row{display:flex;align-items:center;justify-content:center;gap:.4rem;flex-wrap:wrap}
.pomo-ctrl-row .select-sm{max-width:110px;font-size:.75rem}
#pomodoro-bar.running{background:var(--c-primary-light)}
#pomodoro-bar.break{background:#FEF3C7}
#pomodoro-bar.running .pomo-time{color:var(--c-primary-dark)}

/* === Celebration === */
.celebration-overlay{position:fixed;top:0;left:0;width:100%;height:100%;background:rgba(0,0,0,.5);z-index:1000;display:flex;align-items:center;justify-content:center;animation:fadeIn .3s}
.celebration-card{background:var(--c-white);border-radius:16px;padding:2rem;text-align:center;max-width:300px;width:90%;animation:scaleIn .4s cubic-bezier(.175,.885,.32,1.275)}
.celebration-icon{font-size:3rem;margin-bottom:.5rem;animation:bounce 1s infinite}
.celebration-title{font-size:1.3rem;font-weight:700;color:var(--c-primary);margin:.25rem 0}
.celebration-phase{font-size:.85rem;color:var(--c-secondary);margin-bottom:.5rem}
.celebration-text{font-size:.9rem;color:var(--c-secondary);margin-bottom:1rem}
@keyframes fadeIn{from{opacity:0}to{opacity:1}}
@keyframes scaleIn{from{transform:scale(.8);opacity:0}to{transform:scale(1);opacity:1}}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-10px)}}

/* === Mood Chart === */
.mood-chart{width:100%;height:120px;margin-top:.5rem}
.mood-legend{display:flex;gap:.75rem;font-size:.7rem;color:var(--c-hint);justify-content:center;margin-top:.25rem}

/* === Due date === */
.due-tag{font-size:.65rem;padding:.1rem .35rem;border-radius:3px;margin-left:.5rem;white-space:nowrap}
.due-tag.normal{background:var(--c-primary-light);color:var(--c-primary)}
.due-tag.soon{background:#FEF3C7;color:#D97706}
.due-tag.overdue{background:#FEE2E2;color:#DC2626}

/* === Today quote === */
.quote-card{text-align:center;padding:.75rem 1rem;background:linear-gradient(135deg,var(--c-primary-light),#EDE9FE);border-radius:var(--radius);margin-bottom:.75rem}
.quote-text{font-size:.85rem;color:var(--c-primary-dark);font-weight:500;font-style:italic}
.quote-label{font-size:.65rem;color:var(--c-hint);margin-top:4px}}