/* ==========================================================================
   Ledger — Student Expense Tracker
   Design: ink/paper ledger aesthetic. Space Grotesk (display), Inter (body),
   JetBrains Mono (all money figures — tabular numerals so amounts align).
   ========================================================================== */

:root{
  --font-display:'Space Grotesk',sans-serif;
  --font-body:'Inter',sans-serif;
  --font-mono:'JetBrains Mono',monospace;

  --radius-sm:8px;
  --radius-md:14px;
  --radius-lg:20px;
  --shadow-sm:0 1px 2px rgba(16,24,32,.04),0 1px 1px rgba(16,24,32,.03);
  --shadow-md:0 4px 16px rgba(16,24,32,.06),0 1px 2px rgba(16,24,32,.04);
  --shadow-lg:0 12px 32px rgba(16,24,32,.10);

  --sidebar-w:230px;
  --topbar-ink:#0F1620;
}

/* ---------- Light theme (default) ---------- */
body[data-theme="light"]{
  --bg:#F6F7F9;
  --surface:#FFFFFF;
  --surface-2:#F0F2F5;
  --border:#E3E7EC;
  --ink:#16202B;
  --ink-soft:#616B7A;
  --ink-faint:#9AA3B0;
  --accent:#0F6B5C;
  --accent-ink:#FFFFFF;
  --accent-soft:#E3F1ED;
  --income:#1E8E5A;
  --income-soft:#E5F5EC;
  --expense:#C24A3B;
  --expense-soft:#FBEAE7;
  --warn:#B4801F;
  --warn-soft:#FBF1DD;
  --danger:#C24A3B;
  --danger-soft:#FBEAE7;
  --grid-line:rgba(15,107,92,.08);
}

/* ---------- Dark theme ---------- */
body[data-theme="dark"]{
  --bg:#0D1420;
  --surface:#141D2C;
  --surface-2:#1A2436;
  --border:#28334A;
  --ink:#E9EDF4;
  --ink-soft:#9CA9BE;
  --ink-faint:#67728A;
  --accent:#41C0A2;
  --accent-ink:#08201A;
  --accent-soft:rgba(65,192,162,.12);
  --income:#4FC988;
  --income-soft:rgba(79,201,136,.12);
  --expense:#E68872;
  --expense-soft:rgba(230,136,114,.12);
  --warn:#E3B25F;
  --warn-soft:rgba(227,178,95,.12);
  --danger:#E68872;
  --danger-soft:rgba(230,136,114,.12);
  --grid-line:rgba(65,192,162,.10);
}

*{box-sizing:border-box;margin:0;padding:0;}
html{-webkit-font-smoothing:antialiased;}
body{
  font-family:var(--font-body);
  background:var(--bg);
  color:var(--ink);
  transition:background .2s ease,color .2s ease;
}
svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;flex-shrink:0;}
button,input,select{font-family:inherit;font-size:inherit;color:inherit;}
button{cursor:pointer;background:none;border:none;}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;}

/* ================= Layout ================= */
.app{display:flex;min-height:100vh;}

.sidebar{
  width:var(--sidebar-w);
  background:var(--topbar-ink);
  color:#C7D0DE;
  display:flex;
  flex-direction:column;
  padding:22px 14px;
  position:sticky;top:0;height:100vh;
  flex-shrink:0;
}
.sidebar-brand{
  display:flex;align-items:center;gap:10px;
  padding:8px 10px 26px;
}
.brand-mark{
  font-family:var(--font-mono);
  font-weight:700;
  color:var(--accent);
  background:rgba(65,192,162,.15);
  padding:4px 8px;border-radius:6px;
  font-size:14px;
}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:18px;color:#fff;letter-spacing:.2px;}

.sidebar-nav{display:flex;flex-direction:column;gap:2px;flex:1;}
.nav-item{
  display:flex;align-items:center;gap:12px;
  padding:11px 12px;border-radius:10px;
  color:#9DAAC0;font-weight:500;font-size:14.5px;
  text-align:left;width:100%;
  transition:background .15s ease,color .15s ease;
}
.nav-item svg{width:18px;height:18px;}
.nav-item:hover{background:rgba(255,255,255,.06);color:#fff;}
.nav-item.active{background:rgba(65,192,162,.15);color:var(--accent);}

.sidebar-footer{border-top:1px solid rgba(255,255,255,.08);padding-top:14px;}
.theme-toggle{
  display:flex;align-items:center;gap:10px;width:100%;
  padding:10px 12px;border-radius:10px;color:#9DAAC0;font-size:14px;font-weight:500;
}
.theme-toggle:hover{background:rgba(255,255,255,.06);color:#fff;}
.icon-moon{display:none;}
body[data-theme="dark"] .icon-sun{display:none;}
body[data-theme="dark"] .icon-moon{display:block;}

.mobile-nav{display:none;}

.main{flex:1;min-width:0;padding:32px 40px 64px;max-width:1180px;}

.view{display:none;animation:fadeIn .25s ease;}
.view.active{display:block;}
@keyframes fadeIn{from{opacity:0;transform:translateY(4px);}to{opacity:1;transform:translateY(0);}}

.view-header{
  display:flex;align-items:flex-start;justify-content:space-between;
  gap:16px;margin-bottom:26px;flex-wrap:wrap;
}
.view-header h1{font-family:var(--font-display);font-size:26px;font-weight:700;letter-spacing:-.2px;}
.view-sub{color:var(--ink-soft);font-size:14px;margin-top:4px;}

/* ================= Buttons ================= */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:10px;
  font-weight:600;font-size:14px;
  transition:transform .12s ease,background .15s ease,box-shadow .15s ease;
  white-space:nowrap;
}
.btn:active{transform:translateY(1px);}
.btn svg{width:16px;height:16px;}
.btn-primary{background:var(--accent);color:var(--accent-ink);box-shadow:var(--shadow-sm);}
.btn-primary:hover{box-shadow:var(--shadow-md);filter:brightness(1.04);}
.btn-secondary{background:var(--surface-2);color:var(--ink);border:1px solid var(--border);}
.btn-secondary:hover{background:var(--border);}
.btn-ghost{background:transparent;color:var(--ink-soft);}
.btn-ghost:hover{color:var(--ink);}
.btn-danger{background:var(--danger-soft);color:var(--danger);}
.btn-danger:hover{filter:brightness(.95);}
.link-btn{color:var(--accent);font-weight:600;font-size:13.5px;}
.link-btn:hover{text-decoration:underline;}

/* ================= Ledger hero (signature element) ================= */
.ledger-hero{
  position:relative;overflow:hidden;
  background:var(--surface);
  border:1px solid var(--border);
  border-radius:var(--radius-lg);
  padding:28px 32px 30px;
  margin-bottom:20px;
  box-shadow:var(--shadow-sm);
}
.ledger-hero-grid{
  position:absolute;inset:0;
  background-image:
    linear-gradient(var(--grid-line) 1px,transparent 1px),
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px);
  background-size:24px 24px;
  mask-image:linear-gradient(to right,black,transparent 75%);
  -webkit-mask-image:linear-gradient(to right,black,transparent 75%);
  pointer-events:none;
}
.ledger-hero-label{
  position:relative;font-family:var(--font-mono);font-size:12px;
  letter-spacing:1.5px;color:var(--ink-faint);font-weight:600;
}
.ledger-hero-value{
  position:relative;font-family:var(--font-mono);font-weight:700;
  font-size:clamp(34px,5vw,52px);letter-spacing:-1px;
  margin-top:4px;color:var(--ink);
}
.ledger-hero-sub{position:relative;color:var(--ink-soft);font-size:13.5px;margin-top:6px;}
.ledger-hero-sub.positive{color:var(--income);}
.ledger-hero-sub.negative{color:var(--expense);}
.ledger-hero-top{position:relative;display:flex;justify-content:space-between;align-items:flex-start;gap:16px;}
.savings-badge{
  display:flex;flex-direction:column;align-items:flex-end;
  background:var(--accent-soft);border-radius:var(--radius-md);padding:10px 14px;
}
.savings-badge[hidden]{display:none;}
.savings-value{font-size:22px;font-weight:700;color:var(--accent);line-height:1.1;}
.savings-label{font-size:11.5px;color:var(--ink-soft);font-weight:500;}

.flow-bar{position:relative;margin-top:22px;}
.flow-bar[hidden]{display:none;}
.flow-track{display:flex;height:10px;border-radius:6px;overflow:hidden;background:var(--surface-2);gap:3px;}
.flow-income{background:var(--income);transition:flex-basis .4s ease;}
.flow-expense{background:var(--expense);transition:flex-basis .4s ease;}
.flow-legend{display:flex;gap:20px;flex-wrap:wrap;margin-top:10px;font-size:12.5px;color:var(--ink-soft);}
.flow-legend b{color:var(--ink);font-weight:600;margin-left:4px;}
.dot{display:inline-block;width:8px;height:8px;border-radius:50%;margin-right:6px;vertical-align:middle;}
.dot.income{background:var(--income);}
.dot.expense{background:var(--expense);}

/* ================= Welcome card ================= */
.welcome-card{
  position:relative;overflow:hidden;
  display:flex;align-items:center;justify-content:space-between;gap:24px;flex-wrap:wrap;
  background:var(--topbar-ink);color:#C7D0DE;
  border-radius:var(--radius-lg);padding:26px 30px;margin-bottom:20px;
  box-shadow:var(--shadow-md);
  animation:fadeIn .3s ease;
}
.welcome-card[hidden]{display:none;}
body[data-theme="dark"] .welcome-card{border:1px solid rgba(65,192,162,.25);}
.welcome-card::after{
  content:"";position:absolute;right:-60px;top:-60px;width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,rgba(65,192,162,.28),transparent 70%);pointer-events:none;
}
.welcome-text{position:relative;max-width:560px;}
.welcome-eyebrow{font-size:11.5px;letter-spacing:1.5px;color:#41C0A2;font-weight:600;}
.welcome-card h2{font-family:var(--font-display);font-size:21px;color:#fff;margin:6px 0 8px;letter-spacing:-.2px;}
.welcome-card p{font-size:14px;line-height:1.55;color:#9DAAC0;}
.welcome-actions{position:relative;display:flex;gap:10px;flex-wrap:wrap;}
.welcome-card .btn-primary{background:#41C0A2;color:#08201A;}
.welcome-card .btn-secondary{background:rgba(255,255,255,.06);color:#fff;border-color:rgba(255,255,255,.12);}
.welcome-card .btn-secondary:hover{background:rgba(255,255,255,.12);}

/* ================= Stat cards ================= */
.stat-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:20px;
}
.stat-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:18px;
  display:flex;align-items:center;gap:14px;
  box-shadow:var(--shadow-sm);
  transition:transform .15s ease,box-shadow .15s ease;
}
.stat-card:hover{transform:translateY(-2px);box-shadow:var(--shadow-md);}
.stat-icon{
  width:42px;height:42px;border-radius:10px;flex-shrink:0;
  display:flex;align-items:center;justify-content:center;
}
.stat-icon svg{width:20px;height:20px;}
.icon-income{background:var(--income-soft);color:var(--income);}
.icon-expense{background:var(--expense-soft);color:var(--expense);}
.icon-month{background:var(--accent-soft);color:var(--accent);}
.icon-count{background:var(--surface-2);color:var(--ink-soft);}
.stat-body{display:flex;flex-direction:column;gap:3px;min-width:0;}
.stat-label{font-size:12.5px;color:var(--ink-soft);font-weight:500;}
.stat-value{font-size:19px;font-weight:600;}

/* ================= Budget progress ================= */
.budget-card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-md);padding:18px 20px;margin-bottom:20px;
  box-shadow:var(--shadow-sm);
}
.budget-head{display:flex;justify-content:space-between;font-size:13.5px;margin-bottom:10px;color:var(--ink-soft);font-weight:500;}
.progress-track{height:8px;border-radius:6px;background:var(--surface-2);overflow:hidden;}
.progress-fill{height:100%;border-radius:6px;background:var(--accent);width:0%;transition:width .3s ease,background .3s ease;}
.progress-fill.warn{background:var(--warn);}
.progress-fill.danger{background:var(--danger);}

/* ================= Cards ================= */
.card{
  background:var(--surface);border:1px solid var(--border);
  border-radius:var(--radius-lg);padding:22px;margin-bottom:20px;
  box-shadow:var(--shadow-sm);
}
.card h2{font-family:var(--font-display);font-size:16px;font-weight:600;margin-bottom:16px;}
.card-head-row{display:flex;align-items:center;justify-content:space-between;margin-bottom:14px;}
.card-head-row h2{margin-bottom:0;}

.chart-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:20px;}
.chart-card{margin-bottom:0;}
.chart-wrap{position:relative;height:230px;}
.empty-note{color:var(--ink-faint);font-size:13px;text-align:center;padding-top:60px;}

/* ================= Recent txn list ================= */
.txn-list{display:flex;flex-direction:column;gap:2px;}
.txn-row{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 4px;border-bottom:1px solid var(--border);
  gap:12px;
}
.txn-row:last-child{border-bottom:none;}
.txn-left{display:flex;align-items:center;gap:12px;min-width:0;}
.txn-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0;}
.txn-dot.income{background:var(--income);}
.txn-dot.expense{background:var(--expense);}
.txn-info{min-width:0;}
.txn-desc{font-weight:500;font-size:14px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;}
.txn-meta{font-size:12.5px;color:var(--ink-soft);}
.txn-amount{font-weight:600;font-size:14px;flex-shrink:0;}
.txn-amount.income{color:var(--income);}
.txn-amount.expense{color:var(--expense);}

/* ================= Empty states ================= */
.empty-state{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  text-align:center;padding:44px 20px;color:var(--ink-soft);
}
.empty-state[hidden]{display:none;}
.empty-state svg{width:34px;height:34px;color:var(--ink-faint);margin-bottom:12px;}
.empty-state p{font-weight:600;color:var(--ink);margin-bottom:4px;}
.empty-state span{font-size:13.5px;}

/* ================= Form ================= */
.form-card{padding:24px;}
.type-switch{
  display:inline-flex;background:var(--surface-2);border-radius:10px;padding:4px;margin-bottom:18px;
}
.type-btn{
  padding:8px 22px;border-radius:8px;font-weight:600;font-size:13.5px;color:var(--ink-soft);
  transition:background .15s ease,color .15s ease;
}
.type-btn.active[data-type="expense"]{background:var(--expense);color:#fff;}
.type-btn.active[data-type="income"]{background:var(--income);color:#fff;}

.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.field{display:flex;flex-direction:column;gap:6px;}
.field-wide{grid-column:1 / -1;}
.field label{font-size:13px;font-weight:600;color:var(--ink-soft);}
.field input,.field select{
  padding:10px 12px;border-radius:9px;border:1px solid var(--border);
  background:var(--bg);color:var(--ink);font-size:14px;
}
.field input:focus,.field select:focus{outline:2px solid var(--accent);outline-offset:1px;}
.field-error{font-size:12px;color:var(--danger);min-height:14px;}
.field.has-error input,.field.has-error select{border-color:var(--danger);}
.form-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:20px;}

/* ================= Filters + table ================= */
.filters-row{display:flex;gap:10px;margin-bottom:18px;flex-wrap:wrap;}
.search-field{
  flex:1;min-width:200px;display:flex;align-items:center;gap:8px;
  border:1px solid var(--border);border-radius:9px;padding:9px 12px;background:var(--bg);
}
.search-field svg{width:16px;height:16px;color:var(--ink-faint);}
.search-field input{border:none;background:none;flex:1;font-size:14px;}
.search-field input:focus{outline:none;}
.filters-row select{
  border:1px solid var(--border);border-radius:9px;padding:9px 12px;background:var(--bg);font-size:13.5px;
}

.table-wrap{overflow-x:auto;}
.txn-table{width:100%;border-collapse:collapse;font-size:14px;}
.txn-table th{
  text-align:left;font-size:12px;letter-spacing:.4px;color:var(--ink-faint);
  font-weight:600;text-transform:uppercase;padding:0 10px 10px;border-bottom:1px solid var(--border);
}
.txn-table td{padding:12px 10px;border-bottom:1px solid var(--border);vertical-align:middle;}
.txn-table tbody tr{transition:background .12s ease;}
.txn-table tbody tr:hover{background:var(--surface-2);}
.txn-table tr:last-child td{border-bottom:none;}
.align-right{text-align:right;}
.cat-pill{
  display:inline-block;padding:3px 10px;border-radius:20px;font-size:12px;font-weight:600;
  background:var(--surface-2);color:var(--ink-soft);
}
.type-indicator{
  display:inline-flex;align-items:center;gap:6px;font-size:12.5px;font-weight:600;
}
.type-indicator.income{color:var(--income);}
.type-indicator.expense{color:var(--expense);}
.del-btn{
  color:var(--ink-faint);padding:6px;border-radius:8px;
}
.del-btn:hover{color:var(--danger);background:var(--danger-soft);}
.del-btn svg{width:16px;height:16px;}

/* ================= Settings ================= */
.settings-card h2{margin-bottom:4px;}
.setting-row{
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  padding:16px 0;border-top:1px solid var(--border);
}
.settings-card h2 + .setting-row{border-top:none;padding-top:14px;}
.setting-row strong{font-size:14.5px;font-weight:600;}
.setting-row p{font-size:13px;color:var(--ink-soft);margin-top:3px;max-width:420px;}
.setting-row.wrap{flex-wrap:wrap;}

.switch{position:relative;display:inline-block;width:44px;height:26px;flex-shrink:0;}
.switch input{opacity:0;width:0;height:0;}
.slider{
  position:absolute;cursor:pointer;inset:0;background:var(--surface-2);
  border:1px solid var(--border);border-radius:20px;transition:.2s;
}
.slider::before{
  content:"";position:absolute;height:18px;width:18px;left:3px;top:3px;
  background:#fff;border-radius:50%;transition:.2s;box-shadow:0 1px 3px rgba(0,0,0,.2);
}
.switch input:checked + .slider{background:var(--accent);}
.switch input:checked + .slider::before{transform:translateX(18px);}

.budget-form{display:flex;gap:8px;}
.budget-form input{
  width:130px;padding:9px 12px;border-radius:9px;border:1px solid var(--border);background:var(--bg);font-size:14px;
}

/* ================= Toasts ================= */
.toast-stack{position:fixed;bottom:24px;right:24px;display:flex;flex-direction:column;gap:10px;z-index:200;}
.toast{
  display:flex;align-items:center;gap:10px;
  background:var(--surface);border:1px solid var(--border);color:var(--ink);
  padding:12px 16px;border-radius:10px;box-shadow:var(--shadow-lg);
  font-size:13.5px;font-weight:500;min-width:220px;
  animation:slideIn .2s ease;
}
.toast.success{border-left:3px solid var(--income);}
.toast.error{border-left:3px solid var(--danger);}
@keyframes slideIn{from{opacity:0;transform:translateX(16px);}to{opacity:1;transform:translateX(0);}}

/* ================= Modal ================= */
.modal-backdrop{
  position:fixed;inset:0;background:rgba(10,14,20,.5);
  display:flex;align-items:center;justify-content:center;z-index:300;padding:20px;
}
.modal-backdrop[hidden]{display:none;}
.modal{
  background:var(--surface);border-radius:var(--radius-lg);padding:24px;max-width:360px;width:100%;
  box-shadow:var(--shadow-lg);
}
.modal h3{font-family:var(--font-display);font-size:17px;margin-bottom:8px;}
.modal p{font-size:14px;color:var(--ink-soft);margin-bottom:20px;}
.modal-actions{display:flex;justify-content:flex-end;gap:10px;}

/* ================= Responsive ================= */
@media (max-width:980px){
  .stat-grid{grid-template-columns:repeat(2,1fr);}
  .chart-grid{grid-template-columns:1fr;}
}

@media (max-width:760px){
  .sidebar{display:none;}
  .mobile-nav{
    display:flex;position:fixed;bottom:0;left:0;right:0;z-index:100;
    background:var(--topbar-ink);padding:8px 6px calc(8px + env(safe-area-inset-bottom));
    justify-content:space-around;
  }
  .mnav-item{
    display:flex;flex-direction:column;align-items:center;gap:3px;
    color:#8D99AF;font-size:11px;font-weight:500;padding:6px 10px;border-radius:10px;
  }
  .mnav-item svg{width:19px;height:19px;}
  .mnav-item.active{color:var(--accent);}
  .main{padding:20px 16px 90px;}
  .view-header{margin-bottom:18px;}
  .form-grid{grid-template-columns:1fr;}
  .filters-row{flex-direction:column;}
  .filters-row select{width:100%;}
  .stat-grid{grid-template-columns:1fr 1fr;gap:10px;}
  .ledger-hero-value{font-size:36px;}
  .ledger-hero{padding:22px 20px 24px;}
  .welcome-card{padding:22px 20px;}
  .welcome-actions{width:100%;}
  .welcome-actions .btn{flex:1;justify-content:center;}
  .toast-stack{bottom:84px;right:16px;left:16px;}
  .setting-row{flex-direction:column;align-items:flex-start;gap:10px;}
  .budget-form{width:100%;}
  .budget-form input{flex:1;width:auto;}
}

@media (max-width:420px){
  .stat-grid{grid-template-columns:1fr;}
}

/* Reduced motion */
@media (prefers-reduced-motion:reduce){
  *{animation-duration:.001ms !important;transition-duration:.001ms !important;}
}

/* Visible keyboard focus */
a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}