/* app.css — Global layout and component styles
   Imports tokens.css for design tokens.
   Validates: Requirements 6.1, 6.3, 6.4, 6.6 */

@import url("tokens.css");

/* ============================================================
   Global Reset & Base
   ============================================================ */

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  line-height: 1.6;
  min-height: 100dvh;
  overflow-x: hidden;
}

img,
svg {
  display: block;
  max-width: 100%;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ============================================================
   Layout Container
   Responsive from 320px to 2560px, no horizontal scroll
   ============================================================ */

.container {
  width: 100%;
  max-width: 860px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {
  .container {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1280px) {
  .container {
    padding-inline: var(--space-8);
  }
}

main {
  padding-block: var(--space-8);
}

/* ============================================================
   Nav Bar — Req 6.3
   .nav, .nav-brand, .nav-actions
   ============================================================ */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding-block: var(--space-4);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xl);
  font-weight: 700;
  color: var(--color-text);
  text-decoration: none;
  white-space: nowrap;
}

.nav-brand:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.nav-brand svg,
.nav-brand img {
  width: 1.75rem;
  height: 1.75rem;
  flex-shrink: 0;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.nav-actions a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.nav-actions a:hover {
  color: var(--color-primary);
}

/* ============================================================
   Card Component
   ============================================================ */

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  padding: var(--space-6);
  box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.07);
}

.card + .card {
  margin-top: var(--space-4);
}

/* ============================================================
   Button Styles
   .btn, .btn-primary, .btn-secondary, .btn-ghost
   ============================================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1.5;
  border-radius: 0.5rem;
  border: 1px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: background-color 0.15s ease, border-color 0.15s ease,
    color 0.15s ease, box-shadow 0.15s ease;
  text-decoration: none;
  user-select: none;
}

.btn:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

.btn:disabled,
.btn[aria-disabled="true"] {
  opacity: 0.5;
  cursor: not-allowed;
  pointer-events: none;
}

.btn-primary {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #ffffff;
}

.btn-primary:hover {
  background-color: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  text-decoration: none;
  color: #ffffff;
}

.btn-secondary {
  background-color: var(--color-surface-alt);
  border-color: var(--color-border);
  color: var(--color-text);
}

.btn-secondary:hover {
  background-color: var(--color-border);
  text-decoration: none;
  color: var(--color-text);
}

.btn-ghost {
  background-color: transparent;
  border-color: transparent;
  color: var(--color-text-muted);
}

.btn-ghost:hover {
  background-color: var(--color-surface-alt);
  color: var(--color-text);
  text-decoration: none;
}

/* ============================================================
   Input & Form Styles
   .input, .form-group, .label
   ============================================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
}

.input {
  width: 100%;
  padding: var(--space-2) var(--space-4);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  line-height: 1.5;
  transition: border-color 0.15s ease, box-shadow 0.15s ease;
  appearance: none;
}

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

.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgb(37 99 235 / 0.15);
}

.input:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  background-color: var(--color-surface-alt);
}

/* ============================================================
   Loading Indicator — Req 6.6
   ============================================================ */

.loading-spinner {
  display: inline-block;
  width: 1.5rem;
  height: 1.5rem;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  flex-shrink: 0;
}

.loading-spinner--lg {
  width: 2.5rem;
  height: 2.5rem;
  border-width: 3px;
}

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

.loading-overlay {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-8);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}

/* ============================================================
   Error Toast
   .toast, .toast-error
   ============================================================ */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-4);
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-width: min(calc(100vw - 2 * var(--space-4)), 400px);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  padding: var(--space-4);
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  box-shadow: 0 4px 12px 0 rgb(0 0 0 / 0.12);
  font-size: var(--text-sm);
  color: var(--color-text);
  pointer-events: auto;
  animation: toast-in 0.2s ease;
}

.toast-error {
  border-color: #fca5a5;
  background-color: #fef2f2;
  color: #991b1b;
}

@media (prefers-color-scheme: dark) {
  .toast-error {
    border-color: #7f1d1d;
    background-color: #1c0a0a;
    color: #fca5a5;
  }
}

.toast-close {
  margin-left: auto;
  flex-shrink: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  opacity: 0.6;
  font-size: var(--text-lg);
  line-height: 1;
  padding: 0;
}

.toast-close:hover {
  opacity: 1;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateY(0.5rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================================
   Verse Picker Container — Req 6.4
   ============================================================ */

.verse-picker {
  border: 1px solid var(--color-border);
  border-radius: 0.75rem;
  background-color: var(--color-surface);
  overflow: hidden;
}

.verse-picker-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface-alt);
}

.verse-picker-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.verse-picker-breadcrumb button {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-primary);
  font-size: var(--text-sm);
  padding: 0;
  font-family: var(--font-sans);
}

.verse-picker-breadcrumb button:hover {
  text-decoration: underline;
}

.verse-picker-list {
  list-style: none;
  max-height: 280px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.verse-picker-item {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-4);
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-base);
  color: var(--color-text);
  transition: background-color 0.1s ease;
}

.verse-picker-item:last-child {
  border-bottom: none;
}

.verse-picker-item:hover,
.verse-picker-item:focus-visible {
  background-color: var(--color-surface-alt);
  outline: none;
}

.verse-picker-item[aria-selected="true"] {
  background-color: var(--color-surface-alt);
  color: var(--color-primary);
  font-weight: 600;
}

/* ============================================================
   Autocomplete Dropdown
   .autocomplete-dropdown, .autocomplete-item
   ============================================================ */

.autocomplete-wrapper {
  position: relative;
}

.autocomplete-dropdown {
  position: absolute;
  top: calc(100% + var(--space-1));
  left: 0;
  right: 0;
  z-index: 150;
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 0.5rem;
  box-shadow: 0 4px 12px 0 rgb(0 0 0 / 0.1);
  list-style: none;
  overflow: hidden;
  max-height: 280px;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.autocomplete-item {
  display: block;
  width: 100%;
  padding: var(--space-2) var(--space-4);
  text-align: left;
  background: none;
  border: none;
  border-bottom: 1px solid var(--color-border);
  cursor: pointer;
  font-family: var(--font-sans);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: background-color 0.1s ease;
}

.autocomplete-item:last-child {
  border-bottom: none;
}

.autocomplete-item:hover,
.autocomplete-item[aria-selected="true"] {
  background-color: var(--color-surface-alt);
  outline: none;
}

.autocomplete-item--empty {
  color: var(--color-text-muted);
  cursor: default;
  font-style: italic;
}

.autocomplete-item--empty:hover {
  background-color: transparent;
}

/* ============================================================
   Auth Modal
   .modal, .modal-overlay, .modal-content
   ============================================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 300;
  background-color: rgb(0 0 0 / 0.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-4);
  animation: fade-in 0.15s ease;
}

.modal-overlay:not([hidden]) {
  display: flex;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 440px;
  background-color: var(--color-surface);
  border-radius: 0.75rem;
  box-shadow: 0 20px 40px 0 rgb(0 0 0 / 0.2);
  animation: modal-in 0.2s ease;
  overflow: hidden;
}

.modal-content {
  padding: var(--space-6);
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-6);
  border-bottom: 1px solid var(--color-border);
}

.modal-title {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-muted);
  font-size: var(--text-xl);
  line-height: 1;
  padding: var(--space-1);
  border-radius: 0.25rem;
  transition: color 0.1s ease, background-color 0.1s ease;
}

.modal-close:hover {
  color: var(--color-text);
  background-color: var(--color-surface-alt);
}

@keyframes fade-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

@keyframes modal-in {
  from {
    opacity: 0;
    transform: translateY(-1rem) scale(0.97);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

/* ============================================================
   Responsive Utilities
   Ensures no horizontal scroll from 320px to 2560px — Req 6.1
   ============================================================ */

@media (max-width: 480px) {
  .nav-actions {
    gap: var(--space-1);
  }

  .card {
    padding: var(--space-4);
  }

  .modal-content {
    padding: var(--space-4);
  }

  .modal-header {
    padding: var(--space-4);
  }
}

@media (min-width: 1024px) {
  .verse-picker-list {
    max-height: 360px;
  }

  .autocomplete-dropdown {
    max-height: 360px;
  }
}