/* ── Design System ─────────────────────────────────────────────── */
:root {
  --bg:            #f9fafb;
  --surface:       #ffffff;
  --border:        #e5e7eb;
  --border-input:  #d1d5db;
  --text:          #111827;
  --text-secondary:#6b7280;
  --text-tertiary: #9ca3af;
  --primary:       #111827;
  --primary-hover: #374151;
  --green:         #16a34a;
  --green-bg:      #f0fdf4;
  --green-border:  #bbf7d0;
  --red:           #dc2626;
  --red-bg:        #fef2f2;
  --red-border:    #fecaca;
  --amber:         #d97706;
  --amber-bg:      #fffbeb;
  --amber-border:  #fde68a;
  --shadow:        0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md:     0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.05);
  --radius:        12px;
  --radius-sm:     8px;
  --radius-xs:     6px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:16px;scroll-behavior:smooth}
body{
  font-family:'Inter',system-ui,sans-serif;
  background:var(--bg);
  min-height:100vh;
  color:var(--text);
}

/* ── Nav ───────────────────────────────────────────────────────── */
.app-nav{
  position:sticky;top:0;z-index:100;
  display:flex;align-items:center;gap:16px;
  padding:12px 24px;
  background:var(--surface);
  border-bottom:1px solid var(--border);
}
.nav-brand{display:flex;align-items:center}
.nav-title{color:var(--text);font-weight:700;font-size:.9rem;letter-spacing:-.01em}
.nav-center{flex:1;display:flex;justify-content:center}
.live-estimate{
  background:var(--bg);border:1px solid var(--border);
  border-radius:var(--radius-xs);padding:5px 14px;
  display:flex;align-items:center;gap:8px;
}
.le-label{color:var(--text-secondary);font-size:.78rem;font-weight:500}
.le-value{color:var(--text);font-weight:600;font-size:.875rem}
.nav-right{display:flex;align-items:center;gap:6px;position:relative}
.nav-btn{
  background:transparent;border:none;
  color:var(--text-secondary);padding:6px 12px;border-radius:var(--radius-xs);
  font-size:.82rem;font-weight:500;cursor:pointer;transition:.15s;
}
.nav-btn:hover{background:var(--bg);color:var(--text)}
.nav-btn-pro{color:var(--amber)}
.nav-btn-pro:hover{background:var(--amber-bg)}
.nav-avatar{
  width:30px;height:30px;border-radius:50%;
  background:var(--primary);
  color:#fff;font-weight:600;font-size:.8rem;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
}
.user-menu{
  position:absolute;top:calc(100% + 8px);right:0;
  background:var(--surface);border-radius:var(--radius-sm);
  box-shadow:var(--shadow-md);border:1px solid var(--border);
  padding:12px;min-width:180px;z-index:200;
}
.user-menu-name{font-weight:600;font-size:.875rem}
.user-menu-tier{font-size:.78rem;color:var(--text-secondary);margin-bottom:8px}
.user-menu hr{border:none;border-top:1px solid var(--border);margin:8px 0}
.user-menu button{
  background:none;border:none;color:var(--red);
  font-size:.85rem;cursor:pointer;font-weight:500;padding:4px 0;
}

/* ── Screens ───────────────────────────────────────────────────── */
.screen{min-height:100vh;padding-bottom:60px}
.hidden{display:none!important}

/* ── Auth Screen ───────────────────────────────────────────────── */
.screen-auth{
  display:flex;align-items:center;justify-content:center;
  min-height:100vh;padding:40px 24px;
}
.auth-center{width:100%;max-width:420px}
.auth-header{text-align:center;margin-bottom:28px}
.auth-title{font-size:1.35rem;font-weight:700;color:var(--text);margin-bottom:6px}
.auth-tagline{font-size:.875rem;color:var(--text-secondary);line-height:1.5}
.auth-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:28px 32px;
  box-shadow:var(--shadow);
}
.auth-tabs{display:flex;margin-bottom:24px;border-bottom:1px solid var(--border)}
.auth-tab{
  flex:1;background:none;border:none;padding:10px;cursor:pointer;
  font-size:.875rem;font-weight:500;color:var(--text-secondary);
  border-bottom:2px solid transparent;margin-bottom:-1px;transition:.15s;
}
.auth-tab.active{color:var(--text);border-bottom-color:var(--text)}

/* ── Forms ─────────────────────────────────────────────────────── */
.field{margin-bottom:16px}
.field label{display:block;font-size:.82rem;font-weight:500;color:var(--text);margin-bottom:5px}
.field label small{font-weight:400;color:var(--text-secondary);margin-left:4px}
.field input[type=number],.field input[type=text],.field input[type=email],.field input[type=password],.select-field{
  width:100%;padding:9px 12px;border:1px solid var(--border-input);border-radius:var(--radius-sm);
  font-size:.875rem;font-family:inherit;outline:none;transition:.15s;background:var(--surface);color:var(--text);
}
.field input:focus,.select-field:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(17,24,39,.08)}
.input-wrap{position:relative;display:flex;align-items:center}
.input-wrap input{padding-left:26px!important;width:100%}
.input-prefix{position:absolute;left:10px;color:var(--text-secondary);font-weight:500;font-size:.8rem;pointer-events:none}
.form-error{color:var(--red);font-size:.82rem;margin-bottom:12px;padding:9px 12px;background:var(--red-bg);border-radius:var(--radius-xs);border:1px solid var(--red-border)}

/* ── Buttons ───────────────────────────────────────────────────── */
.btn-primary{
  background:var(--primary);
  color:#fff;border:none;padding:10px 20px;border-radius:var(--radius-sm);
  font-size:.875rem;font-weight:500;cursor:pointer;transition:.15s;
}
.btn-primary:hover{background:var(--primary-hover)}
.btn-primary:active{opacity:.9}
.btn-primary.btn-calculate{padding:11px 28px;font-size:.9rem}
.btn-ghost{
  background:transparent;border:1px solid var(--border);color:var(--text-secondary);
  padding:9px 18px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;cursor:pointer;transition:.15s;
}
.btn-ghost:hover{background:var(--bg);color:var(--text)}
.btn-outline{
  background:transparent;border:1px solid var(--border-input);color:var(--text);
  padding:9px 18px;border-radius:var(--radius-sm);font-size:.875rem;font-weight:500;cursor:pointer;transition:.15s;
}
.btn-outline:hover{border-color:var(--primary)}
.w-full{width:100%}

/* ── Option buttons ────────────────────────────────────────────── */
.option-group{display:flex;gap:6px;flex-wrap:wrap;margin-top:5px}
.option-btn{
  flex:1;min-width:80px;padding:8px 14px;border:1px solid var(--border-input);
  border-radius:var(--radius-sm);background:var(--surface);font-size:.82rem;font-weight:500;cursor:pointer;
  transition:.15s;color:var(--text-secondary);
}
.option-btn.active{background:var(--primary);color:#fff;border-color:var(--primary)}
.option-btn:hover:not(.active){border-color:var(--text-secondary);color:var(--text)}

/* ── Wizard ────────────────────────────────────────────────────── */
.screen-wizard{padding-top:0}
.wizard-progress{
  background:var(--surface);
  padding:14px 40px;position:sticky;top:0;z-index:50;
  border-bottom:1px solid var(--border);
}
.wp-steps{display:flex;align-items:center;justify-content:center;gap:0;margin-bottom:10px}
.wp-step{display:flex;align-items:center;gap:6px;opacity:.45;transition:.2s}
.wp-step.active,.wp-step.done{opacity:1}
.wps-dot{
  width:26px;height:26px;border-radius:50%;
  background:var(--surface);border:1px solid var(--border);
  color:var(--text-tertiary);font-size:.75rem;font-weight:600;
  display:flex;align-items:center;justify-content:center;transition:.2s;
}
.wp-step.active .wps-dot{background:var(--primary);color:#fff;border-color:var(--primary)}
.wp-step.done .wps-dot{background:var(--green);color:#fff;border-color:var(--green)}
.wps-label{color:var(--text-secondary);font-size:.72rem;font-weight:500;white-space:nowrap}
.wp-step.active .wps-label{color:var(--text);font-weight:600}
.wp-line{flex:1;height:1px;background:var(--border);max-width:60px;margin:0 4px}
.wp-bar{background:var(--border);border-radius:4px;height:2px;max-width:560px;margin:0 auto}
.wp-fill{height:100%;background:var(--primary);border-radius:4px;transition:width .4s ease}

.wizard-body{max-width:660px;margin:0 auto;padding:36px 24px}
.wizard-step{display:none;animation:fadeIn .2s ease}
.wizard-step.active{display:block}
@keyframes fadeIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

.step-card{
  background:var(--surface);border-radius:var(--radius);
  padding:32px;box-shadow:var(--shadow);border:1px solid var(--border);
}
.step-title{font-size:1.2rem;font-weight:700;color:var(--text);margin-bottom:5px}
.step-sub{color:var(--text-secondary);margin-bottom:24px;font-size:.82rem;line-height:1.6}
.step-actions{display:flex;gap:8px;margin-top:28px;justify-content:flex-end}
.field-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
@media(max-width:540px){.field-grid{grid-template-columns:1fr}}

/* ── Deduction sections ────────────────────────────────────────── */
.deduction-section{margin-bottom:14px;padding:14px;background:var(--bg);border-radius:var(--radius-sm);border:1px solid var(--border)}
.deduction-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.deduction-label{font-size:.82rem;font-weight:600;color:var(--text)}
.deduction-limit{font-size:.72rem;color:var(--text-secondary);font-weight:500;background:var(--surface);border:1px solid var(--border);padding:2px 8px;border-radius:10px}
.progress-mini{height:3px;background:var(--border);border-radius:2px;margin-top:8px}
.progress-mini-fill{height:100%;background:var(--primary);border-radius:2px;transition:width .3s}
.progress-mini-labels{display:flex;justify-content:space-between;font-size:.7rem;color:var(--text-tertiary);margin-top:3px}
.checkbox-label{display:flex;align-items:center;gap:8px;font-size:.82rem;color:var(--text-secondary);cursor:pointer;margin-top:8px}
.toggle-label{display:flex;align-items:center;gap:10px;font-size:.875rem;font-weight:500;color:var(--text);cursor:pointer;padding:10px 12px;background:var(--bg);border-radius:var(--radius-sm);border:1px solid var(--border);margin-bottom:12px}
.toggle-label input{width:15px;height:15px;accent-color:var(--primary)}
.divider{border:none;border-top:1px solid var(--border);margin:20px 0}
.sub-heading{font-size:.875rem;font-weight:600;margin-bottom:12px;color:var(--text)}

/* ── Capital Gains ─────────────────────────────────────────────── */
.cg-grid{display:flex;flex-direction:column;gap:8px}
.cg-card{
  display:flex;align-items:center;gap:16px;
  padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);transition:.15s;
}
.cg-card:hover{border-color:var(--text-secondary)}
.cg-info{flex:1}
.cg-name{font-weight:600;font-size:.875rem;color:var(--text)}
.cg-rate{font-size:.75rem;color:var(--text-secondary);font-weight:500;margin:2px 0}
.cg-desc{font-size:.72rem;color:var(--text-tertiary)}
.cg-input{width:150px;flex-shrink:0}

/* ── Result ────────────────────────────────────────────────────── */
.result-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;padding:80px;color:var(--text-secondary)}
.result-winner{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius);padding:24px 28px;margin-bottom:18px;
  box-shadow:var(--shadow);
}
.result-winner .rw-label{font-size:.72rem;font-weight:600;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.07em;margin-bottom:4px}
.result-winner .rw-regime{font-size:.9rem;font-weight:600;color:var(--text);margin:4px 0}
.result-winner .rw-tax{font-size:2.25rem;font-weight:800;color:var(--text);line-height:1.1}
.result-winner .rw-eff{font-size:.82rem;color:var(--text-secondary);margin-top:5px}
.regime-compare{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:18px}
@media(max-width:500px){.regime-compare{grid-template-columns:1fr}}
.rc-box{background:var(--surface);border-radius:var(--radius-sm);padding:18px 20px;box-shadow:var(--shadow);border:1px solid var(--border);transition:.15s}
.rc-box.winner{border-color:var(--green)}
.rc-label{font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-secondary);margin-bottom:6px}
.rc-tax{font-size:1.4rem;font-weight:800;color:var(--text)}
.rc-eff{font-size:.78rem;color:var(--text-secondary);margin-top:2px}
.rc-bar-wrap{background:var(--bg);border:1px solid var(--border);border-radius:2px;height:5px;margin-top:12px;overflow:hidden}
.rc-bar{height:100%;border-radius:2px;transition:width .7s ease}
.rc-bar.new{background:var(--primary)}
.rc-bar.old{background:var(--text-secondary)}
.rc-winner-tag{display:inline-block;background:var(--green-bg);color:var(--green);border:1px solid var(--green-border);font-size:.7rem;font-weight:600;padding:3px 8px;border-radius:10px;margin-top:8px}
.savings-card{
  background:var(--green-bg);border:1px solid var(--green-border);
  border-radius:var(--radius-sm);padding:18px 22px;margin-bottom:18px;
}
.savings-label{font-size:.72rem;font-weight:600;color:var(--green);text-transform:uppercase;letter-spacing:.06em;margin-bottom:4px}
.savings-amount{font-size:1.75rem;font-weight:800;color:var(--green);line-height:1.1}
.savings-regime{font-size:.82rem;color:#15803d;margin-top:4px}
.breakdown-section{margin-bottom:18px}
.bd-header{
  display:flex;justify-content:space-between;align-items:center;
  padding:11px 16px;background:var(--surface);border-radius:var(--radius-sm) var(--radius-sm) 0 0;
  cursor:pointer;font-weight:600;font-size:.82rem;
  border:1px solid var(--border);margin-bottom:0;transition:.15s;
}
.bd-header:hover{background:var(--bg)}
.bd-body{
  background:var(--surface);border-radius:0 0 var(--radius-sm) var(--radius-sm);padding:10px 16px;
  border:1px solid var(--border);border-top:none;display:none;
}
.bd-body.open{display:block}
.bd-row{display:flex;justify-content:space-between;padding:6px 0;border-bottom:1px solid var(--bg);font-size:.82rem;color:var(--text-secondary)}
.bd-row:last-child{border:none;font-weight:600;color:var(--text)}
.result-cta{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}

/* ── Spinner ───────────────────────────────────────────────────── */
.spinner{width:32px;height:32px;border:2px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}
.spinner-wrap{display:flex;justify-content:center;padding:60px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ── Secondary screens ─────────────────────────────────────────── */
.screen-secondary{padding:24px;max-width:760px;margin:0 auto}
.secondary-header{display:flex;align-items:center;gap:14px;margin-bottom:22px;margin-top:12px}
.secondary-header h2{color:var(--text);font-size:1.1rem;font-weight:700}
.back-btn{background:var(--surface);border:1px solid var(--border);color:var(--text-secondary);padding:6px 14px;border-radius:var(--radius-sm);cursor:pointer;font-size:.82rem;font-weight:500;transition:.15s}
.back-btn:hover{color:var(--text)}
.pro-tag{background:var(--amber-bg);color:var(--amber);border:1px solid var(--amber-border);font-size:.7rem;font-weight:600;padding:3px 9px;border-radius:10px}
.screen-hint{color:var(--text-secondary);margin-bottom:14px;font-size:.875rem}

/* ── History ───────────────────────────────────────────────────── */
.history-list{display:flex;flex-direction:column;gap:8px}
.hist-card{background:var(--surface);border-radius:var(--radius-sm);padding:14px 18px;border:1px solid var(--border)}
.hist-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.hist-fy{font-size:.78rem;color:var(--text-secondary);font-weight:500}
.hist-rec{font-size:.82rem;font-weight:600;color:var(--text)}
.hist-taxes{display:flex;gap:20px;flex-wrap:wrap}
.hist-tax-item span:first-child{font-size:.72rem;color:var(--text-secondary);display:block;margin-bottom:1px}
.hist-tax-item span:last-child{font-weight:600;font-size:.875rem}

/* ── Upload ────────────────────────────────────────────────────── */
.upload-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:0 0 20px}
@media(max-width:600px){.upload-grid{grid-template-columns:1fr}}
.upload-card{background:var(--surface);border-radius:var(--radius-sm);padding:22px;border:1px solid var(--border);text-align:center}
.upload-card h3{font-size:.9rem;font-weight:600;margin-bottom:5px;color:var(--text)}
.upload-card p{font-size:.82rem;color:var(--text-secondary);margin-bottom:16px;line-height:1.5}
.upload-label{display:block;cursor:pointer}
.upload-label input{display:none}

/* ── Optimize ──────────────────────────────────────────────────── */
.opt-content{padding:0 0 20px}
.opt-total{background:var(--surface);border-radius:var(--radius-sm);padding:18px 20px;margin:12px 0;border:1px solid var(--border);display:flex;gap:24px;flex-wrap:wrap}
.opt-total-item span:first-child{font-size:.72rem;color:var(--text-secondary);display:block;margin-bottom:2px;text-transform:uppercase;letter-spacing:.04em}
.opt-total-item span:last-child{font-size:1.2rem;font-weight:700}
.opt-total-item.savings span:last-child{color:var(--green)}
.opt-suggestion{background:var(--surface);border-radius:var(--radius-sm);padding:14px 16px;margin-bottom:8px;border:1px solid var(--border);border-left:3px solid var(--border)}
.opt-suggestion.high{border-left-color:var(--green)}
.opt-suggestion.medium{border-left-color:var(--amber)}
.opt-suggestion h4{font-size:.875rem;font-weight:600;margin-bottom:4px;color:var(--text)}
.opt-suggestion p{font-size:.82rem;color:var(--text-secondary);line-height:1.5}
.opt-saving{color:var(--green);font-weight:600}

/* ── Guide ─────────────────────────────────────────────────────── */
.guide-list{display:flex;flex-direction:column;border:1px solid var(--border);border-radius:var(--radius-sm);overflow:hidden}
.guide-step{
  display:flex;align-items:flex-start;gap:14px;padding:14px 18px;
  background:var(--surface);cursor:pointer;transition:.15s;border-bottom:1px solid var(--border);
}
.guide-step:last-child{border:none}
.guide-step:hover{background:var(--bg)}
.guide-step.done{background:var(--green-bg)}
.guide-step.done .gs-num{background:var(--green);border-color:var(--green)}
.guide-step.done .gs-check{opacity:1;color:var(--green)}
.gs-num{
  width:26px;height:26px;border-radius:50%;background:var(--primary);
  color:#fff;font-weight:700;font-size:.75rem;display:flex;align-items:center;
  justify-content:center;flex-shrink:0;transition:.2s;
}
.gs-body{flex:1}
.gs-title{font-weight:600;font-size:.875rem;margin-bottom:3px;color:var(--text)}
.gs-desc{font-size:.8rem;color:var(--text-secondary);line-height:1.5}
.gs-check{opacity:0;font-size:.9rem;transition:.2s;align-self:center;color:var(--green)}
.guide-footer{text-align:center;color:var(--text-secondary);font-size:.8rem;margin-top:14px}