/* ============================================================
   SmartCash — Design System & Component Styles
   Neutral dark theme with accent highlights
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* --- Design Tokens --- */
:root {
  /* Color palette */
  --color-bg-primary: #0a0a0f;
  --color-bg-secondary: #12121a;
  --color-bg-elevated: #1a1a25;
  --color-bg-card: rgba(255, 255, 255, 0.04);
  --color-bg-card-hover: rgba(255, 255, 255, 0.06);

  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-hover: rgba(255, 255, 255, 0.15);

  --color-text-primary: rgba(255, 255, 255, 0.92);
  --color-text-secondary: rgba(255, 255, 255, 0.55);
  --color-text-muted: rgba(255, 255, 255, 0.35);

  --color-accent: #34d399;
  --color-accent-hover: #6ee7b7;
  --color-accent-glow: rgba(52, 211, 153, 0.15);
  --color-accent-text: #022c22;

  --color-error: #f87171;
  --color-error-bg: rgba(248, 113, 113, 0.1);

  /* Typography */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Radii */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 0.875rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px var(--color-accent-glow);

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 400ms ease;

  /* Navbar */
  --navbar-height: 3.5rem;

  color-scheme: dark;
}

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

html {
  font-size: 100%;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  min-height: 100dvh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-accent-hover);
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

input {
  font-family: inherit;
}

/* --- Utility: Screen-reader only --- */
.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;
}

/* --- View Management --- */
.view {
  display: none;
}

.view.active {
  display: block;
  animation: viewFadeIn var(--transition-slow) ease;
}

.view.active.landing,
.view.active.login,
.view.active.app {
  display: flex;
}

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

/* ============================================================
   LANDING PAGE
   ============================================================ */
.landing {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: var(--space-xl);
  position: relative;
  overflow: hidden;
}

/* Ambient background glow */
.landing::before {
  content: '';
  position: absolute;
  top: -40%;
  left: 50%;
  transform: translateX(-50%);
  width: 60vw;
  height: 60vw;
  max-width: 600px;
  max-height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
  pointer-events: none;
  z-index: 0;
}

.landing__content {
  position: relative;
  z-index: 1;
  max-width: 600px;
}

.landing__logo {
  font-size: clamp(2.5rem, 1.5rem + 4vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-sm);
  text-wrap: balance;
}

.landing__logo-accent {
  color: var(--color-accent);
}

.landing__tagline {
  font-size: clamp(1rem, 0.875rem + 0.5vw, 1.25rem);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2xl);
  text-wrap: pretty;
  max-width: 480px;
}

.landing__features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: var(--space-md);
  margin-bottom: var(--space-2xl);
  width: 100%;
}

.feature-chip {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.feature-chip__icon {
  font-size: 1.125rem;
  line-height: 1;
}

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 0.75rem 2rem;
  font-size: 0.9375rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  min-block-size: 44px;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-accent-text);
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 0 30px var(--color-accent-glow);
}

.btn--primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border: 1px solid var(--color-border);
}

.btn--ghost:hover:not(:disabled) {
  border-color: var(--color-border-hover);
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.btn--sm {
  padding: 0.5rem 1rem;
  font-size: 0.8125rem;
}

.btn--danger {
  background: var(--color-error);
  color: #0f172a;
  box-shadow: 0 0 16px rgba(248, 113, 113, 0.15);
}

.btn--danger:hover:not(:disabled) {
  background: #fca5a5;
  transform: translateY(-1px);
  box-shadow: 0 0 30px rgba(248, 113, 113, 0.3);
}

.btn--danger:active:not(:disabled) {
  transform: translateY(0);
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--loading {
  position: relative;
  color: transparent;
}

.btn--loading::after {
  content: '';
  position: absolute;
  width: 1.125rem;
  height: 1.125rem;
  border: 2px solid transparent;
  border-top-color: currentColor;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

.btn--primary.btn--loading::after {
  border-top-color: var(--color-accent-text);
}

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

/* ============================================================
   LOGIN VIEW
   ============================================================ */
.login {
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-xl);
  position: relative;
}

.login__card {
  width: 100%;
  max-width: 400px;
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  box-shadow: var(--shadow-lg);
}

.login__back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: 0.8125rem;
  color: var(--color-text-muted);
  margin-bottom: var(--space-lg);
  background: none;
  border: none;
  cursor: pointer;
  transition: color var(--transition-fast);
}

.login__back:hover {
  color: var(--color-text-secondary);
}

.login__title {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--space-xs);
  letter-spacing: -0.02em;
}

.login__subtitle {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xl);
}

/* --- Form --- */
.form-group {
  margin-bottom: var(--space-md);
}

.form-label {
  display: block;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-xs);
}

.form-input {
  width: 100%;
  padding: 0.75rem 1rem;
  font-size: 0.9375rem;
  color: var(--color-text-primary);
  background: var(--color-bg-secondary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
  outline: none;
}

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

.form-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

.form-input:user-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px var(--color-error-bg);
}

.login__submit {
  width: 100%;
  margin-top: var(--space-lg);
}

/* --- Error Alert --- */
.alert--error {
  display: none;
  padding: var(--space-sm) var(--space-md);
  background: var(--color-error-bg);
  border: 1px solid rgba(248, 113, 113, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  color: var(--color-error);
  margin-bottom: var(--space-md);
}

.alert--error.visible {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  animation: shakeX 0.4s ease;
}

@keyframes shakeX {
  0%, 100% { transform: translateX(0); }
  20% { transform: translateX(-6px); }
  40% { transform: translateX(6px); }
  60% { transform: translateX(-4px); }
  80% { transform: translateX(4px); }
}

/* --- Success Alert --- */
.alert--success {
  display: none;
  padding: var(--space-sm) var(--space-md);
  background: rgba(52, 211, 153, 0.1);
  border: 1px solid rgba(52, 211, 153, 0.2);
  border-radius: var(--radius-md);
  font-size: 0.8125rem;
  color: var(--color-accent);
  margin-bottom: var(--space-md);
}

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

/* ============================================================
   APP SHELL (Authenticated)
   ============================================================ */
.app {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* --- Navbar --- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  height: var(--navbar-height);
  padding: 0 var(--space-lg);
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
}

.navbar__brand {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.navbar__brand-accent {
  color: var(--color-accent);
}

.navbar__nav {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-inline-start: var(--space-xl);
  list-style: none;
}

.navbar__link {
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
}

.navbar__link:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.navbar__link.active {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.navbar__spacer {
  flex: 1;
}

/* --- User Menu --- */
.user-menu {
  position: relative;
}

.user-menu__trigger {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-xs) var(--space-sm);
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  color: var(--color-text-primary);
  font-size: 0.8125rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast);
  min-block-size: 36px;
}

.user-menu__trigger:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
}

.user-menu__avatar {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-accent-text);
  font-size: 0.6875rem;
  font-weight: 700;
}

.user-menu__chevron {
  font-size: 0.625rem;
  transition: transform var(--transition-fast);
  color: var(--color-text-muted);
}

.user-menu.open .user-menu__chevron {
  transform: rotate(180deg);
}

.user-menu__dropdown {
  display: none;
  position: absolute;
  top: calc(100% + var(--space-xs));
  right: 0;
  min-width: 180px;
  background: var(--color-bg-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xs);
  box-shadow: var(--shadow-lg);
  z-index: 200;
}

.user-menu.open .user-menu__dropdown {
  display: block;
  animation: dropdownIn var(--transition-fast) ease;
}

@keyframes dropdownIn {
  from {
    opacity: 0;
    transform: translateY(-4px) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.user-menu__item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.8125rem;
  color: var(--color-text-secondary);
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-align: start;
}

.user-menu__item:hover {
  color: var(--color-text-primary);
  background: var(--color-bg-card);
}

.user-menu__divider {
  height: 1px;
  background: var(--color-border);
  margin: var(--space-xs) 0;
}

.user-menu__item--danger {
  color: var(--color-error);
}

.user-menu__item--danger:hover {
  background: var(--color-error-bg);
  color: var(--color-error);
}

/* --- Main Content --- */
.main-content {
  flex: 1;
  padding: var(--space-2xl) var(--space-lg);
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

/* --- Welcome Section --- */
.welcome {
  text-align: center;
  padding: var(--space-3xl) 0;
}

.welcome__greeting {
  font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
  font-weight: 600;
  margin-bottom: var(--space-sm);
  letter-spacing: -0.02em;
}

.welcome__message {
  color: var(--color-text-secondary);
  font-size: 0.9375rem;
  margin-bottom: var(--space-2xl);
}

.welcome__cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-md);
  max-width: 720px;
  margin: 0 auto;
}

.stat-card {
  background: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  text-align: start;
  transition: all var(--transition-base);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.stat-card:hover {
  border-color: var(--color-border-hover);
  background: var(--color-bg-card-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.stat-card__icon {
  font-size: 1.5rem;
  margin-bottom: var(--space-sm);
}

.stat-card__label {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-xs);
}

.stat-card__value {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

/* --- Mobile Nav Toggle --- */
.navbar__toggle {
  display: none;
  background: none;
  border: none;
  color: var(--color-text-primary);
  font-size: 1.25rem;
  padding: var(--space-sm);
  cursor: pointer;
  min-block-size: 44px;
  min-inline-size: 44px;
  align-items: center;
  justify-content: center;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 768px) {
  .navbar__toggle {
    display: flex;
    margin-inline-start: auto;
    margin-inline-end: var(--space-sm);
  }

  .navbar__nav {
    display: none;
    position: absolute;
    top: var(--navbar-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg-secondary);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-sm);
    margin: 0;
  }

  .navbar__nav.open {
    display: flex;
  }

  .navbar__link {
    padding: var(--space-md);
    width: 100%;
  }

  .landing__features {
    grid-template-columns: 1fr 1fr;
  }

  .welcome__cards {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .landing__features {
    grid-template-columns: 1fr;
  }

  .login__card {
    padding: var(--space-xl);
  }
}

/* --- Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  .view.active {
    animation: none;
  }

  .alert--error.visible {
    animation: none;
  }

  .btn--primary:hover:not(:disabled) {
    transform: none;
  }

  .stat-card:hover {
    transform: none;
  }

  .user-menu.open .user-menu__dropdown {
    animation: none;
  }
}

/* --- Slow Operations Loading States --- */
.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100vw;
  height: 100vh;
  background: rgba(10, 10, 15, 0.85);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.loading-overlay.visible {
  opacity: 1;
  pointer-events: auto;
}

.loading-overlay__spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-bottom: var(--space-md);
}

.loading-overlay__text {
  color: var(--color-text-primary);
  font-size: 1.1rem;
  font-weight: 500;
  letter-spacing: -0.01em;
}

tr.row-loading {
  opacity: 0.5;
  pointer-events: none;
  transition: opacity var(--transition-fast);
}

/* Micro-spinner for day adjustment cell */
.day-adjust-wrapper.loading {
  position: relative;
  min-width: 16px;
  min-height: 24px;
}

.day-adjust-wrapper.loading .day-adjust-btn {
  visibility: hidden;
}

.day-adjust-wrapper.loading::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 12px;
  height: 12px;
  margin-left: -6px;
  margin-top: -6px;
  border: 2px solid var(--color-text-secondary);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* --- Dev Indicator --- */
.dev-indicator {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 5px var(--space-sm);
  margin-inline-start: var(--space-md);
  color: hsl(35, 100%, 60%);
  background: hsla(35, 100%, 50%, 0.08);
  border: 1px solid hsla(35, 100%, 50%, 0.25);
  border-radius: var(--radius-sm);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  user-select: none;
  box-shadow: 0 0 8px hsla(35, 100%, 50%, 0.05);
  animation: dev-pulse 2.5s infinite ease-in-out;
}

.dev-indicator__icon {
  flex-shrink: 0;
  stroke: hsl(35, 100%, 60%);
}

.dev-indicator__text {
  line-height: 1;
}

@keyframes dev-pulse {
  0%, 100% {
    border-color: hsla(35, 100%, 50%, 0.25);
    box-shadow: 0 0 8px hsla(35, 100%, 50%, 0.05);
  }
  50% {
    border-color: hsla(35, 100%, 50%, 0.50);
    box-shadow: 0 0 12px hsla(35, 100%, 50%, 0.15);
  }
}

@media (max-width: 480px) {
  .dev-indicator {
    padding: var(--space-xs);
    margin-inline-start: var(--space-xs);
  }
  .dev-indicator__text {
    display: none;
  }
}