/* ============================================================
   Spend — iOS-Inspired Expense Tracker
   style.css
   ============================================================ */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

/* ---------- Variables ---------- */
:root {
  --bg:           #000000;
  --bg2:          #0e0e0f;
  --bg3:          #1c1c1e;
  --bg4:          #2c2c2e;
  --bg5:          #3a3a3c;
  --text:         #ffffff;
  --text-2:       rgba(255,255,255,0.6);
  --text-3:       rgba(255,255,255,0.3);
  --separator:    rgba(255,255,255,0.08);
  --green:        #30d158;
  --red:          #ff453a;
  --blue:         #0a84ff;
  --orange:       #ff9f0a;
  --purple:       #bf5af2;
  --teal:         #5ac8fa;
  --yellow:       #ffd60a;
  --pink:         #ff375f;
  --radius-sm:    10px;
  --radius-md:    14px;
  --radius-lg:    20px;
  --radius-xl:    28px;

  /* category colors */
  --cat-food:          #ff9f0a;
  --cat-transport:     #30d158;
  --cat-shopping:      #bf5af2;
  --cat-health:        #ff453a;
  --cat-entertainment: #0a84ff;
  --cat-income:        #30d158;
  --cat-other:         #636366;
}

/* ---------- Base ---------- */
html { -webkit-text-size-adjust: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'DM Sans', -apple-system, sans-serif;
  min-height: 100vh;
  max-width: 430px;
  margin: 0 auto;
  padding-bottom: 3rem;
  -webkit-font-smoothing: antialiased;
}

/* ---------- Header ---------- */
.header {
  padding: 3.5rem 1.5rem 1.5rem;
  background: var(--bg);
  position: sticky;
  top: 0;
  z-index: 100;
  border-bottom: 1px solid var(--separator);
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.8rem;
}

.app-title {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text);
}

.icon-btn {
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--blue);
  border: none;
  color: #fff;
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  transition: transform 0.15s, opacity 0.15s;
}

.icon-btn:active { transform: scale(0.9); opacity: 0.8; }

/* Balance hero */
.balance-hero { margin-bottom: 1.2rem; }

.balance-label {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  letter-spacing: 0.02em;
  margin-bottom: 0.2rem;
  text-transform: uppercase;
}

.balance-amount {
  font-size: 3rem;
  font-weight: 700;
  letter-spacing: -0.04em;
  line-height: 1;
  color: var(--text);
  transition: all 0.3s cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* Summary pills */
.summary-pills {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.pill {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  background: var(--bg3);
  border-radius: var(--radius-md);
  padding: 0.85rem 1rem;
}

.pill-icon {
  font-size: 1rem;
  font-weight: 700;
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
}

.pill-income .pill-icon  { background: rgba(48,209,88,0.18);  color: var(--green); }
.pill-expense .pill-icon { background: rgba(255,69,58,0.18);  color: var(--red); }

.pill-label {
  font-size: 0.7rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 0.1rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.pill-val {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.pill-income .pill-val  { color: var(--green); }
.pill-expense .pill-val { color: var(--red); }

/* ---------- Main ---------- */
.main { padding: 1.5rem; display: flex; flex-direction: column; gap: 2rem; }

/* ---------- Section ---------- */
.section { display: flex; flex-direction: column; gap: 0.75rem; overflow: hidden; }

.section-header {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: space-between;
  gap: 15px;
  margin-bottom: 20px;
}
.section-title {
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

/* ---------- Filter Tabs ---------- */
.filter-tabs {
  max-width: 382px;
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  padding-bottom: 10px;
  -webkit-overflow-scrolling: touch;
  cursor: grab;
  user-select: none;
}

.filter-tabs::-webkit-scrollbar {
  height: 6px;
  background: var(--bg3);
}

.filter-tabs::-webkit-scrollbar-thumb {
  background: var(--text-3);
  border-radius: 3px;
}

.filter-tabs::-webkit-scrollbar-thumb:hover {
  background: var(--text-2);
}

.tab {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.72rem;
  font-weight: 500;
  padding: 0.3rem 0.75rem;
  border-radius: 20px;
  border: 1px solid var(--bg4);
  background: var(--bg3);
  color: var(--text-2);
  cursor: pointer;
  white-space: nowrap;
  transition: all 0.15s;
  flex-shrink: 0;
}

.tab.active {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

/* ---------- Chart ---------- */
.chart-card {
  background: var(--bg3);
  border-radius: var(--radius-lg);
  padding: 1.2rem;
  overflow: hidden;
}

/* ---------- Category Grid ---------- */
.category-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
}

.cat-card {
  background: var(--bg3);
  border-radius: var(--radius-md);
  padding: 1rem;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  animation: fade-up 0.3s ease both;
}

@keyframes fade-up {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.cat-dot {
  width: 10px; height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.cat-info { flex: 1; min-width: 0; }

.cat-name {
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-2);
  margin-bottom: 0.15rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.cat-amount {
  font-size: 1rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.cat-bar-wrap {
  height: 3px;
  background: var(--bg4);
  border-radius: 2px;
  margin-top: 0.4rem;
  overflow: hidden;
}

.cat-bar {
  height: 100%;
  border-radius: 2px;
  transition: width 0.6s cubic-bezier(0.34, 1.2, 0.64, 1);
}

/* ---------- Transaction List ---------- */
.tx-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
}

.empty-icon { font-size: 2.5rem; margin-bottom: 0.8rem; }

.empty-text {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 0.3rem;
}

.empty-sub {
  font-size: 0.82rem;
  color: var(--text-3);
}

/* Transaction row */
.tx-row {
  background: var(--bg3);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
  display: flex;
  align-items: center;
  gap: 0.9rem;
  animation: slide-in 0.25s cubic-bezier(0.34, 1.3, 0.64, 1) both;
  cursor: default;
  transition: background 0.15s;
}

@keyframes slide-in {
  from { opacity: 0; transform: translateX(-10px); }
  to   { opacity: 1; transform: translateX(0); }
}

.tx-row:active { background: var(--bg4); }

.tx-icon {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.1rem;
  flex-shrink: 0;
}

.tx-info { flex: 1; min-width: 0; }

.tx-desc {
  font-size: 0.92rem;
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-bottom: 0.15rem;
}

.tx-meta {
  font-size: 0.72rem;
  color: var(--text-2);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.tx-cat-dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  display: inline-block;
}

.tx-amount {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  flex-shrink: 0;
}

.tx-amount.income { color: var(--green); }
.tx-amount.expense { color: var(--text); }

.tx-delete {
  background: none;
  border: none;
  color: var(--text-3);
  cursor: pointer;
  font-size: 1rem;
  padding: 0.2rem;
  border-radius: 50%;
  transition: color 0.15s;
  flex-shrink: 0;
  line-height: 1;
}

.tx-delete:hover { color: var(--red); }

/* ---------- Buttons ---------- */
.text-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.82rem;
  font-weight: 500;
  background: none;
  border: none;
  cursor: pointer;
  transition: opacity 0.15s;
}

.text-btn.danger { color: var(--red); }
.text-btn:active { opacity: 0.6; }

/* ---------- Bottom Sheet ---------- */
.sheet-overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.6);
  z-index: 200;
  align-items: flex-end;
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

.sheet-overlay.active { display: flex; }

.bottom-sheet {
  width: 100%;
  max-width: 430px;
  margin: 0 auto;
  background: var(--bg3);
  border-radius: var(--radius-xl) var(--radius-xl) 0 0;
  padding: 0.75rem 1.5rem 2.5rem;
  transform: translateY(100%);
  transition: transform 0.38s cubic-bezier(0.32, 0.72, 0, 1);
  max-height: 92vh;
  overflow-y: auto;
}

.bottom-sheet.open { transform: translateY(0); }

.sheet-handle {
  width: 36px; height: 4px;
  border-radius: 2px;
  background: var(--bg5);
  margin: 0 auto 1.4rem;
}

.sheet-title {
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1.4rem;
}

/* Form */
.form-group { margin-bottom: 1.1rem; }

.form-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-2);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.45rem;
}

.form-input {
  width: 100%;
  background: var(--bg4);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--text);
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 400;
  padding: 0.8rem 1rem;
  outline: none;
  transition: border-color 0.15s;
  -webkit-appearance: none;
}

.form-input:focus { border-color: var(--blue); }
.form-input::placeholder { color: var(--text-3); }
.form-amount { font-family: 'DM Mono', monospace; font-size: 1.2rem; }

/* Date input */
input[type="date"] { color-scheme: dark; }

/* Category picker */
.cat-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.cat-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.45rem 0.9rem;
  border-radius: 20px;
  border: 1px solid var(--bg5);
  background: var(--bg4);
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.15s;
}

.cat-btn.active {
  background: var(--blue);
  border-color: var(--blue);
  color: #fff;
}

/* Type toggle */
.type-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  background: var(--bg4);
  border-radius: var(--radius-sm);
  padding: 3px;
  gap: 3px;
}

.type-btn {
  font-family: 'DM Sans', sans-serif;
  font-size: 0.88rem;
  font-weight: 500;
  padding: 0.55rem;
  border-radius: 8px;
  border: none;
  background: transparent;
  color: var(--text-2);
  cursor: pointer;
  transition: all 0.18s;
}

.type-btn.active {
  background: var(--bg3);
  color: var(--text);
  box-shadow: 0 1px 4px rgba(0,0,0,0.3);
}

/* Buttons */
.submit-btn {
  width: 100%;
  padding: 1rem;
  border-radius: var(--radius-md);
  border: none;
  background: var(--blue);
  color: #fff;
  font-family: 'DM Sans', sans-serif;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  margin-top: 0.5rem;
  transition: opacity 0.15s, transform 0.12s;
  letter-spacing: -0.01em;
}

.submit-btn:active { opacity: 0.85; transform: scale(0.98); }

.cancel-btn {
  width: 100%;
  padding: 0.9rem;
  border-radius: var(--radius-md);
  border: none;
  background: transparent;
  color: var(--text-2);
  font-family: 'DM Sans', sans-serif;
  font-size: 0.95rem;
  font-weight: 500;
  cursor: pointer;
  margin-top: 0.4rem;
  transition: color 0.15s;
}

.cancel-btn:active { color: var(--text); }

/* ---------- Footer ---------- */
.footer {
  text-align: center;
  padding: 1rem;
  color: var(--text-2);
  font-size: 0.8rem;
  font-weight: 500;
}

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 0; }