/*
 * Bankist — Modern Fintech UI
 * Theme: Dark / Glassmorphism
 * Palette: Deep Navy, Electric Blue, subtle gradients
 */

/* ========== CSS Custom Properties ========== */
:root {
  /* Core palette */
  --bg-deep: #0f1419;
  --bg-navy: #15202b;
  --bg-card: #1c2938;
  --glass-bg: rgba(28, 41, 56, 0.6);
  --glass-border: rgba(255, 255, 255, 0.08);
  --electric-blue: #1d9bf0;
  --electric-blue-dim: rgba(29, 155, 240, 0.25);
  --accent-cyan: #00d4aa;
  --accent-green: #00ba88;
  --accent-red: #f4212e;
  --accent-amber: #ffad1f;
  --text-primary: #e7e9ea;
  --text-secondary: #8b98a5;
  --text-muted: #6e767d;
  /* Spacing & shape */
  --radius-sm: 0.5rem;
  --radius-md: 0.75rem;
  --radius-lg: 1rem;
  --radius-xl: 1.25rem;
  --radius-full: 10rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 2.5rem;
  --space-3xl: 3rem;
  /* Motion */
  --ease-out: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 0.2s;
  --duration-normal: 0.3s;
  --duration-slow: 0.5s;
}

/* ========== Reset & Base ========== */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: inherit;
}

html {
  font-size: 62.5%;
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: 'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-primary);
  background: var(--bg-deep);
  min-height: 100vh;
  padding: var(--space-xl);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

/* Subtle gradient background */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: radial-gradient(ellipse 80% 50% at 50% -20%, var(--electric-blue-dim), transparent),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg-navy) 100%);
  pointer-events: none;
  z-index: 0;
}

/* ========== Navigation — Glassmorphism ========== */
nav {
  position: relative;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--space-lg) var(--space-xl);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-2xl);
}

.welcome {
  font-size: 1.75rem;
  font-weight: 500;
  color: var(--text-primary);
}

.logo {
  height: 4rem;
  filter: brightness(1.1);
}

.login {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.login__input {
  border: 1px solid var(--glass-border);
  padding: var(--space-sm) var(--space-lg);
  font-size: 1.5rem;
  font-family: inherit;
  text-align: center;
  width: 11rem;
  border-radius: var(--radius-full);
  color: var(--text-primary);
  background: rgba(255, 255, 255, 0.06);
  transition: border-color var(--duration-normal) var(--ease-out),
    background-color var(--duration-normal) var(--ease-out),
    transform var(--duration-fast) var(--ease-out);
}

.login__input:focus {
  outline: none;
  border-color: var(--electric-blue);
  background: rgba(255, 255, 255, 0.08);
}

.login__input::placeholder {
  color: var(--text-muted);
}

.login__btn {
  border: none;
  background: linear-gradient(135deg, var(--electric-blue), #1a8cd8);
  color: #fff;
  font-size: 2rem;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--duration-fast) var(--ease-bounce),
    box-shadow var(--duration-normal) var(--ease-out);
  box-shadow: 0 4px 14px rgba(29, 155, 240, 0.35);
}

.login__btn:hover {
  transform: scale(1.05);
  box-shadow: 0 6px 20px rgba(29, 155, 240, 0.45);
}

.login__btn:active {
  transform: scale(0.96);
}

/* ========== Main App Container ========== */
.app {
  position: relative;
  z-index: 1;
  max-width: 100rem;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 4fr 3fr;
  grid-template-rows: auto repeat(3, 15rem) auto;
  gap: var(--space-xl);
  opacity: 0;
  transition: opacity 0.6s var(--ease-out);
}

.app.app--visible {
  opacity: 1;
}

.app > * {
  animation: fadeInUp 0.5s var(--ease-out) backwards;
}

.app .balance { animation-delay: 0.05s; }
.app .movements { animation-delay: 0.1s; }
.app .summary { animation-delay: 0.15s; }
.app .operation--transfer { animation-delay: 0.2s; }
.app .operation--loan { animation-delay: 0.25s; }
.app .operation--close { animation-delay: 0.3s; }
.app .logout-timer { animation-delay: 0.35s; }

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ========== Balance Card ========== */
.balance {
  grid-column: 1 / -1;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  padding: var(--space-xl) var(--space-2xl);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  margin-bottom: var(--space-md);
}

.balance__label {
  font-size: 2rem;
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xs);
}

.balance__date {
  font-size: 1.35rem;
  color: var(--text-muted);
}

.balance__value {
  font-size: 4rem;
  font-weight: 600;
  background: linear-gradient(135deg, var(--text-primary), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.02em;
}

/* ========== Movements (Transaction List) ========== */
.movements {
  grid-row: 2 / span 3;
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-xl);
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  max-height: 48rem;
}

.movements__row {
  padding: var(--space-lg) var(--space-2xl);
  display: flex;
  align-items: center;
  gap: var(--space-lg);
  border-bottom: 1px solid var(--glass-border);
  transition: background var(--duration-fast) var(--ease-out);
}

.movements__row:last-child {
  border-bottom: none;
}

.movements__row:hover {
  background: rgba(255, 255, 255, 0.03);
}

.movements__type {
  font-size: 1.05rem;
  text-transform: uppercase;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #fff;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.movements__type--deposit {
  background: linear-gradient(135deg, var(--accent-green), var(--accent-cyan));
  box-shadow: 0 2px 8px rgba(0, 212, 170, 0.3);
}

.movements__type--withdrawal {
  background: linear-gradient(135deg, var(--accent-red), #ff6b6b);
  box-shadow: 0 2px 8px rgba(244, 33, 46, 0.3);
}

.movements__date {
  font-size: 1.05rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.movements__value {
  font-size: 1.6rem;
  font-weight: 600;
  margin-left: auto;
  flex-shrink: 0;
}

.movements__value:not([data-type="withdrawal"]) {
  color: var(--accent-cyan);
}

.movements__value[data-type="withdrawal"] {
  color: var(--accent-red);
}

/* ========== Summary ========== */
.summary {
  grid-row: 5 / 6;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-sm) var(--space-xl);
  padding: var(--space-md) var(--space-xs);
  margin-top: var(--space-md);
}

.summary__label {
  font-size: 1.15rem;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-right: var(--space-xs);
}

.summary__value {
  font-size: 2rem;
  font-weight: 600;
  margin-right: var(--space-xl);
}

.summary__value--in,
.summary__value--interest {
  color: var(--accent-cyan);
}

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

.btn--sort {
  margin-left: auto;
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  font-size: 1.25rem;
  font-weight: 500;
  padding: var(--space-sm) var(--space-lg);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-bounce),
    color var(--duration-normal), background var(--duration-normal),
    border-color var(--duration-normal);
}

.btn--sort:hover {
  color: var(--electric-blue);
  border-color: var(--electric-blue);
  background: var(--electric-blue-dim);
}

.btn--sort:active {
  transform: scale(0.97);
}

/* ========== Operation Cards (Glassmorphism) ========== */
.operation {
  border-radius: var(--radius-xl);
  padding: var(--space-3xl) var(--space-2xl);
  background: var(--glass-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--glass-border);
  transition: transform var(--duration-fast) var(--ease-out),
    box-shadow var(--duration-normal) var(--ease-out);
}

.operation:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.operation--transfer {
  background: linear-gradient(135deg, rgba(255, 173, 31, 0.15), rgba(255, 173, 31, 0.05));
  border-color: rgba(255, 173, 31, 0.2);
}

.operation--loan {
  background: linear-gradient(135deg, rgba(0, 212, 170, 0.12), rgba(0, 212, 170, 0.04));
  border-color: rgba(0, 212, 170, 0.2);
}

.operation--close {
  background: linear-gradient(135deg, rgba(244, 33, 46, 0.12), rgba(244, 33, 46, 0.04));
  border-color: rgba(244, 33, 46, 0.2);
}

.operation h2 {
  margin-bottom: var(--space-lg);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--text-primary);
}

.form {
  display: grid;
  grid-template-columns: 2.5fr 2.5fr 1fr;
  grid-template-rows: auto auto;
  gap: var(--space-sm) var(--space-md);
}

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

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

.form__input {
  width: 100%;
  border: 1px solid var(--glass-border);
  background: rgba(255, 255, 255, 0.06);
  font-family: inherit;
  font-size: 1.45rem;
  text-align: center;
  color: var(--text-primary);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: border-color var(--duration-normal), background var(--duration-normal);
}

.form__input:focus {
  outline: none;
  border-color: var(--electric-blue);
  background: rgba(255, 255, 255, 0.08);
}

.form__input::placeholder {
  color: var(--text-muted);
}

.form__label {
  font-size: 1.2rem;
  text-align: center;
  color: var(--text-muted);
}

.form__btn {
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.75rem;
  background: rgba(255, 255, 255, 0.12);
  color: var(--text-primary);
  cursor: pointer;
  transition: transform var(--duration-fast) var(--ease-bounce),
    background var(--duration-normal);
}

.form__btn:hover {
  background: rgba(255, 255, 255, 0.18);
}

.form__btn:active {
  transform: scale(0.94);
}

.form__btn--transfer {
  background: linear-gradient(135deg, var(--accent-amber), #e09b00);
  color: #0f1419;
}

.form__btn--loan {
  background: linear-gradient(135deg, var(--accent-cyan), var(--accent-green));
  color: #0f1419;
}

.form__btn--close {
  background: linear-gradient(135deg, var(--accent-red), #cc1a26);
  color: #fff;
}

/* ========== Logout Timer ========== */
.logout-timer {
  padding: var(--space-md) var(--space-xs);
  margin-top: var(--space-lg);
  text-align: right;
  font-size: 1.2rem;
  color: var(--text-muted);
}

.timer {
  font-weight: 600;
  color: var(--electric-blue);
}

/* ========== Loading Spinner ========== */
.spinner-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 20, 25, 0.85);
  backdrop-filter: blur(6px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-normal), visibility var(--duration-normal);
}

.spinner-overlay.spinner-overlay--active {
  opacity: 1;
  visibility: visible;
}

.spinner {
  width: 56px;
  height: 56px;
  border: 4px solid var(--glass-border);
  border-top-color: var(--electric-blue);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}

.spinner-overlay__text {
  position: absolute;
  margin-top: 5rem;
  font-size: 1.1rem;
  color: var(--text-secondary);
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* ========== Micro-interactions: global button scale ========== */
button {
  -webkit-tap-highlight-color: transparent;
}

/* ========== Responsive / Mobile ========== */
@media (max-width: 900px) {
  .app {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    gap: var(--space-lg);
  }

  .balance {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-md);
  }

  .movements {
    grid-row: auto;
    max-height: 28rem;
  }

  .summary {
    grid-row: auto;
  }

  .summary .btn--sort {
    margin-left: 0;
    width: 100%;
  }

  nav {
    flex-wrap: wrap;
    gap: var(--space-md);
  }

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

  .login__input {
    width: 100%;
    min-width: 0;
    flex: 1;
  }
}

@media (max-width: 560px) {
  body {
    padding: var(--space-md);
  }

  .form {
    grid-template-columns: 1fr;
    grid-template-rows: auto;
  }

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

  .form__btn {
    grid-column: 1;
  }

  .balance__value {
    font-size: 2.75rem;
  }

  .movements__row {
    flex-wrap: wrap;
    padding: var(--space-md) var(--space-lg);
  }

  .movements__date {
    width: 100%;
    order: -1;
    font-size: 0.95rem;
  }
}