/* Theme Variables */
:root {
  --bg-color: #f8fafc;
  --card-bg: #ffffff;
  --text-color: #1e293b;
  --subtext-color: #64748b;
  --border-color: #e2e8f0;
  --input-bg: rgba(241, 245, 249, 0.8);
  --primary-brand: #5851ea;

  /* Financial Accent Colors */
  --income-color: #10b981;
  --expense-color: #f43f5e;
  --interest-color: #8b5cf6;
}

[data-theme="dark"] {
  --bg-color: #0f172a;
  --card-bg: #1e293b;
  --text-color: #f8fafc;
  --subtext-color: #94a3b8;
  --border-color: #334155;
  --input-bg: rgba(15, 23, 42, 0.6);
  --primary-brand: #6366f1;
}

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

html {
  font-size: 62.5%; /* 1rem = 10px */
  overflow-x: hidden;
  width: 100%;
}

body {
  overflow-x: hidden;
  width: 100%;
  font-family: "Poppins", sans-serif;
  background-color: var(--bg-color);
  color: var(--text-color);
  transition:
    background-color 0.3s,
    color 0.3s;
  min-height: 100vh;
  padding: 2rem;
}

/* Accessibility Helper */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* LOGO & BRANDING STYLES */
.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--primary-brand);
  letter-spacing: -0.5px;
}

.brand-icon {
  font-size: 3.2rem;
}

/* NAVIGATION */
nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  width: 100%;
}

.nav__left,
.nav__auth {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex: 1;
}

.nav__left {
  justify-content: flex-start;
}

.nav__auth {
  justify-content: flex-end;
}

.welcome {
  font-size: 1.9rem;
  font-weight: 500;
}

.logo {
  height: 5.25rem;
  flex-shrink: 0;
}

/* Theme Toggle Button */
.theme-btn {
  background: none;
  border: none;
  font-size: 2.2rem;
  color: var(--text-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.5rem;
  border-radius: 50%;
  transition:
    transform 0.2s,
    color 0.3s;
}

.theme-btn:hover {
  transform: scale(1.1);
}

.login {
  display: flex;
  align-items: center;
}

.login__input {
  border: none;
  padding: 0.5rem 1.5rem;
  font-size: 1.6rem;
  font-family: inherit;
  text-align: center;
  width: 12rem;
  border-radius: 10rem;
  margin-right: 1rem;
  color: #1e293b;
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  transition: all 0.3s;
}

.login__input:focus {
  outline: none;
  border: 1px solid var(--primary-brand);
}

.login__input::placeholder {
  color: #94a3b8;
}

.login__btn {
  border: none;
  background: none;
  font-size: 2.2rem;
  color: inherit;
  cursor: pointer;
  transition: all 0.3s;
}

.login__btn:hover,
.login__btn:focus,
.btn--sort:hover,
.btn--sort:focus {
  outline: none;
  color: #777;
}

/* Logout Button */
.btn--logout {
  border: none;
  background-color: var(--expense-color);
  color: #fff;
  font-family: inherit;
  font-size: 1.4rem;
  font-weight: 500;
  padding: 0.6rem 1.8rem;
  border-radius: 10rem;
  cursor: pointer;
  transition: background-color 0.3s;
}

.btn--logout:hover {
  background-color: #e11d48;
}

.hidden {
  display: none !important;
}

/* MAIN APP */
.app {
  position: relative;
  max-width: 100rem;
  margin: 4rem auto;
  display: grid;
  grid-template-columns: 4fr 3fr;
  grid-template-rows: auto auto auto;
  gap: 2rem;
  opacity: 0;
  transition: all 1s;
}

.balance {
  grid-column: 1 / span 2;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.balance__label {
  font-size: 2.2rem;
  font-weight: 500;
  margin-bottom: -0.2rem;
}

.balance__date {
  font-size: 1.4rem;
  color: #888;
}

.balance__value {
  font-size: 4.5rem;
  font-weight: 400;
}

/* MOVEMENTS */
.movements {
  grid-column: 1;
  grid-row: 2 / span 4;
  background-color: var(--card-bg, #fff);
  border-radius: 1rem;
  overflow-y: auto;
  max-height: 50rem;
}

.movements__row {
  padding: 2.25rem 2.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 1px solid var(--border-color);
}

.movements__type {
  font-size: 1.1rem;
  text-transform: uppercase;
  font-weight: 500;
  color: #fff;
  padding: 0.2rem 1rem;
  border-radius: 10rem;
  margin-right: 1.5rem;
  white-space: nowrap;
}

.movements__date {
  font-size: 1.1rem;
  text-transform: uppercase;
  font-weight: 500;
  color: #666;
}

.movements__type--deposit {
  background-image: linear-gradient(to top left, #059669, #10b981);
}

.movements__type--withdrawal {
  background-image: linear-gradient(to top left, #e11d48, #f43f5e);
}

.movements__value {
  font-size: 1.7rem;
  margin-left: auto;
  font-weight: 500;
}

/* SUMMARY (DESKTOP) */
.summary {
  grid-column: 1;
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0 0.3rem;
  margin-top: 1rem;
}

.summary__item {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
}

.summary__label {
  font-size: 1.2rem;
  font-weight: 500;
  text-transform: uppercase;
}

.summary__value {
  font-size: 2.2rem;
}

.summary__value--in {
  color: var(--income-color);
}

.summary__value--out {
  color: var(--expense-color);
}

.summary__value--interest {
  color: var(--interest-color);
}

.btn--sort {
  margin-left: auto;
  border: none;
  background: none;
  font-size: 1.3rem;
  font-weight: 500;
  cursor: pointer;
  color: inherit;
}

/* GRAPH CHART */
.analytics-container {
  grid-column: 1 / span 2;
  background-color: var(--card-bg, #fff);
  border-radius: 1rem;
  padding: 2rem 3rem;
  margin-top: 1rem;
  width: 100%;
}

.analytics-container h2 {
  color: var(--text-color);
}

.chart-box {
  position: relative;
  width: 100%;
  max-height: 22rem;
}

/* OPERATIONS */
.operation {
  grid-column: 2;
  border-radius: 1rem;
  padding: 2.5rem 3rem;
  color: #333;
}

.operation h2 {
  color: #ffffff;
}

.operation--transfer {
  background-image: linear-gradient(to top left, #4f46e5, #6366f1);
  color: #fff;
  grid-row: 2;
}

.operation--loan {
  background-image: linear-gradient(to top left, #059669, #10b981);
  color: #fff;
  grid-row: 3;
}

.operation--close {
  background-image: linear-gradient(to top left, #e11d48, #f43f5e);
  color: #fff;
  grid-row: 4;
}

h2 {
  margin-bottom: 1.5rem;
  font-size: 1.7rem;
  font-weight: 600;
  color: #333;
}

.form {
  display: grid;
  grid-template-columns: 2.5fr 2.5fr 1fr;
  grid-template-rows: auto auto;
  gap: 0.4rem 1rem;
}

.form.form--loan {
  grid-template-columns: 2.5fr 1fr 2.5fr;
}

.form__label--loan {
  grid-row: 2;
}

.form__input {
  width: 100%;
  border: none;
  background-color: var(--input-bg);
  font-family: inherit;
  font-size: 1.5rem;
  text-align: center;
  color: var(--text-color);
  padding: 0.3rem 1rem;
  border-radius: 0.7rem;
  transition: all 0.3s;
}

.form__input:focus {
  outline: none;
  background-color: rgba(255, 255, 255, 0.6);
}

.form__label {
  font-size: 1.3rem;
  text-align: center;
}

.form__btn {
  border: none;
  border-radius: 0.7rem;
  font-size: 1.8rem;
  background-color: #fff;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  justify-content: center;
}

.form__btn:focus {
  outline: none;
  background-color: rgba(255, 255, 255, 0.8);
}

.logout-timer {
  padding: 0 0.3rem;
  margin-top: 1.9rem;
  text-align: right;
  font-size: 1.25rem;
}

.timer {
  font-weight: 600;
}

/* RESPONSIVE MEDIA QUERIES */
@media (max-width: 768px) {
  body {
    padding: 1.5rem 1rem;
  }

  nav {
    flex-direction: column;
    gap: 1.2rem;
    padding: 0;
    text-align: center;
  }

  .nav__left,
  .nav__auth {
    width: 100%;
    justify-content: center;
  }

  .logo {
    order: -1;
  }

  .login {
    width: 100%;
    justify-content: center;
  }

  .login__input {
    width: 38%;
    max-width: 11rem;
  }

  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    margin: 2rem 0;
    width: 100%;
    gap: 1.5rem;
  }

  .balance {
    grid-column: 1;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .balance__value {
    font-size: 3.5rem;
  }

  /* RESET LAYOUT ASSIGNMENTS FOR 1 COLUMN */
  .movements,
  .summary,
  .operation,
  .analytics-container {
    grid-column: 1 !important;
    grid-row: auto !important;
    width: 100%;
  }

  /* MOVEMENTS FIX */
  .movements {
    max-height: 32rem;
  }

  .movements__row {
    padding: 1.2rem 1rem;
  }

  .movements__type {
    margin-right: 0.5rem;
    padding: 0.2rem 0.5rem;
    font-size: 0.95rem;
  }

  .movements__date {
    font-size: 0.95rem;
  }

  .movements__value {
    font-size: 1.35rem;
  }

  /* SUMMARY DISPLAY (MOBILE CARD) */
  .summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    padding: 1.2rem 1rem;
    margin-top: 1rem;
    background-color: var(--card-bg);
    border-radius: 1rem;
  }

  .summary__item {
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    text-align: center;
  }

  .summary__label {
    font-size: 1rem;
    color: var(--subtext-color);
  }

  .summary__value {
    font-size: 1.5rem;
    font-weight: 600;
  }

  .btn--sort {
    grid-column: 1 / -1;
    margin: 0.5rem auto 0 auto;
    font-size: 1.2rem;
    padding: 0.4rem;
  }

  /* OPERATIONS FORM GRID FIX */
  .operation {
    padding: 2rem 1.5rem;
  }

  /* Keep 3-column inline grid on mobile with narrower inputs */
  .form {
    grid-template-columns: 1fr 1fr 4.5rem;
    grid-template-rows: auto auto;
    gap: 0.4rem 0.6rem;
  }

  .form.form--loan {
    grid-template-columns: 1fr 4.5rem;
  }

  .form.form--loan .form__input {
    grid-column: 1;
  }

  .form.form--loan .form__btn {
    grid-column: 2;
    grid-row: 1;
  }

  .form.form--loan .form__label {
    grid-column: 1;
    grid-row: 2;
  }

  .form__input {
    font-size: 1.3rem;
    padding: 0.5rem;
  }

  .form__btn {
    font-size: 1.8rem;
    height: 100%;
  }

  .analytics-container {
    padding: 1.5rem 1rem;
  }

  .logout-timer {
    text-align: center;
  }
}