/* Base styles — layout, typography, structure */

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

body {
  margin: 0;
  background:
    radial-gradient(ellipse at 15% 0%, rgba(0,153,153,0.04) 0%, transparent 50%),
    var(--bg-color);
  background-attachment: fixed;
  color: var(--text-color);
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  padding-top: var(--header-height);
  transition: background var(--duration-normal) var(--ease-out),
              color var(--duration-normal) var(--ease-out);
}

body.dark-mode {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(0,153,153,0.12) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 100%, rgba(22,33,62,0.8) 0%, transparent 50%),
    var(--bg-color);
  background-attachment: fixed;
}

/* ═══ FIXED HEADER ═══ */

.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border-color);
  z-index: 1000;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 100%;
  display: flex;
  align-items: center;
  flex-wrap: nowrap;
  padding: 0 var(--space-md);
  gap: var(--space-sm);
}

@media (max-width: 480px) {
  .header-inner { padding: 0 var(--space-sm); gap: 4px; }
  .header-brand { font-size: 0.7rem; }
  .header-title { font-size: var(--text-sm); }
  .icon-btn { width: 30px; height: 30px; font-size: 0.95rem; }
  .theme-option { width: 26px; height: 22px; font-size: 0.7rem; }
  .theme-slider { width: 26px; height: 22px; }
  .theme-switcher[data-active="light"] .theme-slider { transform: translateX(26px); }
  .theme-switcher[data-active="dark"] .theme-slider { transform: translateX(52px); }
}

.header-brand {
  font-weight: 700;
  font-size: var(--text-sm);
  color: var(--siemens-teal);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  flex-shrink: 0;
}

.header-title {
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--text-color);
  margin-left: var(--space-xs);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
  margin-left: auto;
}

.icon-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.1rem;
  transition: background var(--duration-fast),
              color var(--duration-fast);
}

.icon-btn:hover {
  background: var(--section-hover);
  color: var(--text-color);
}

/* ── Theme Switcher Pill ── */

.theme-switcher {
  display: flex;
  align-items: center;
  position: relative;
  background: var(--input-bg);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  padding: 2px;
}

.theme-option {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 30px;
  height: 26px;
  border: none;
  background: transparent;
  color: var(--text-muted);
  cursor: pointer;
  font-size: 0.8rem;
  border-radius: 14px;
  transition: color var(--duration-fast);
}

.theme-option:focus-visible {
  outline: 2px solid var(--siemens-teal);
  outline-offset: -2px;
}

.theme-option.active {
  color: var(--siemens-teal);
}

.theme-option:hover:not(.active) {
  color: var(--text-color);
}

.theme-slider {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 30px;
  height: 26px;
  background: var(--section-hover);
  border-radius: 14px;
  transition: transform var(--duration-normal) var(--ease-out);
  z-index: 0;
  pointer-events: none;
}

.theme-switcher[data-active="system"] .theme-slider { transform: translateX(0); }
.theme-switcher[data-active="light"] .theme-slider { transform: translateX(30px); }
.theme-switcher[data-active="dark"] .theme-slider { transform: translateX(60px); }

body.dark-mode .theme-slider {
  background: var(--border-strong);
}

/* ═══ MAIN CONTENT ═══ */

.app-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-xl);
}

/* ═══ SECTIONS ═══ */

.section {
  background: var(--container-bg);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  margin-bottom: var(--space-md);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  transition: background var(--duration-normal) var(--ease-out),
              border-color var(--duration-normal) var(--ease-out),
              box-shadow var(--duration-normal) var(--ease-out);
}

.section-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 600;
  font-size: var(--text-base);
  color: var(--text-color);
  margin-bottom: var(--space-md);
}

.step-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--siemens-teal);
  color: #fff;
  font-weight: 700;
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.step-badge-success {
  background: #28a745;
}

/* ═══ FIELDS ═══ */

.field-row {
  display: flex;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.field-group {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.field-label {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
}

.field-input {
  width: 100%;
  max-width: 100%;
  min-width: 0;
  box-sizing: border-box;
  padding: 10px 12px;
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  background: var(--input-bg);
  color: var(--form-text);
  font-size: var(--text-base);
  font-family: inherit;
  transition: border-color var(--duration-fast),
              box-shadow var(--duration-fast),
              background var(--duration-fast);
  outline: none;
  -webkit-appearance: none;
}

.field-input:focus {
  border-color: var(--siemens-teal);
  box-shadow: 0 0 0 3px rgba(0, 153, 153, 0.15);
}

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

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

/* Form-control compatibility (JS-generated inputs) */
.form-control {
  background-color: var(--input-bg);
  color: var(--form-text);
  border: 1px solid var(--input-border);
  border-radius: var(--radius-sm);
  transition: border-color var(--duration-fast),
              box-shadow var(--duration-fast);
}

.form-control:focus {
  background-color: var(--input-bg);
  color: var(--form-text);
  border-color: var(--siemens-teal);
  box-shadow: 0 0 0 3px rgba(0, 153, 153, 0.15);
}

.form-control:disabled,
.form-control[disabled] {
  background-color: var(--input-bg) !important;
  color: var(--form-text) !important;
  opacity: 0.5;
}

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

.form-control.is-invalid,
.field-input.is-invalid {
  border-color: #dc3545 !important;
  box-shadow: 0 0 0 3px rgba(220, 53, 69, 0.15) !important;
}

/* Form select theming */
.form-select {
  background-color: var(--input-bg);
  color: var(--form-text);
  border: 1px solid var(--input-border);
}

body.dark-mode .form-select {
  background-color: var(--input-bg);
  color: var(--form-text);
  border-color: var(--input-border);
}

/* ═══ FOOTER ═══ */

.app-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: var(--space-lg) var(--space-md) var(--space-2xl);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--text-muted);
}

.footer-links {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--siemens-teal);
  text-decoration: none;
  font-weight: 500;
  transition: color var(--duration-fast);
}

.footer-links a:hover {
  color: var(--siemens-teal-light);
  text-decoration: underline;
}

.footer-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-muted);
  flex-shrink: 0;
}

.footer-meta {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
  color: var(--text-muted);
  font-size: var(--text-xs);
}

.footer-privacy {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-sm);
}

.footer-disclaimer {
  font-size: var(--text-xs);
  color: var(--text-muted);
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.4;
}

.footer-disclaimer strong {
  color: var(--text-secondary);
}

/* ═══ MODAL THEMING ═══ */

.modal-content {
  background-color: var(--container-bg);
  color: var(--text-color);
  border: 1px solid var(--border-color);
}

/* Always show scrollbar in scrollable modals so users know there's more content */
.modal-dialog-scrollable .modal-body {
  overflow-y: scroll !important;
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}

.modal-dialog-scrollable .modal-body::-webkit-scrollbar {
  -webkit-appearance: none;
  width: 6px;
}

.modal-dialog-scrollable .modal-body::-webkit-scrollbar-thumb {
  background-color: var(--border-color);
  border-radius: 3px;
}

.modal-dialog-scrollable .modal-body::-webkit-scrollbar-track {
  background: transparent;
}

body.dark-mode .modal-content .form-label,
body.dark-mode .modal-content label,
body.dark-mode .modal-content p,
body.dark-mode .modal-content li,
body.dark-mode .modal-content small,
body.dark-mode .modal-content h6 {
  color: var(--text-color);
}

body.dark-mode .text-muted {
  color: var(--text-muted) !important;
}

body.dark-mode .modal-content .form-text {
  color: var(--text-muted);
}

body.dark-mode .modal-content .text-muted {
  color: var(--text-muted) !important;
}

body.dark-mode .btn-close {
  filter: invert(1) grayscale(100%) brightness(200%);
}

/* pre inside modals */
pre {
  background-color: var(--pre-bg);
  padding: 10px;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
}

/* ═══ SKIP NAVIGATION — ADA requirement ═══ */

.skip-link {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

.skip-link:focus {
  position: fixed !important;
  top: calc(var(--header-height) + 8px) !important;
  left: 50% !important;
  transform: translateX(-50%);
  width: auto !important;
  height: auto !important;
  padding: 8px 16px !important;
  margin: 0 !important;
  overflow: visible !important;
  clip: auto !important;
  white-space: normal !important;
  background: var(--siemens-teal) !important;
  color: #fff !important;
  font-weight: 600 !important;
  border-radius: var(--radius-sm) !important;
  z-index: 9999 !important;
  text-decoration: none !important;
  box-shadow: var(--shadow-md) !important;
}

/* ═══ FOCUS VISIBLE — Keyboard navigation indicators ═══ */

:focus:not(:focus-visible) {
  outline: none;
}

:focus-visible {
  outline: 2px solid var(--siemens-teal);
  outline-offset: 2px;
}

.btn-icon-sm:focus-visible,
.icon-btn:focus-visible,
.btn-text:focus-visible,
.btn-export:focus-visible,
.btn-primary-cta:focus-visible,
.btn-sm-action:focus-visible,
.collapsible-header:focus-visible,
.star:focus-visible,
.storage-clear-btn:focus-visible {
  outline: 2px solid var(--siemens-teal);
  outline-offset: 2px;
}

/* ═══ COMPATIBILITY: old classes used by JS ═══ */

/* billing-box — used by scrollToAndHighlight in ui.js */
.billing-box {
  border-radius: var(--radius-lg);
}

/* siemens-header — referenced nowhere in new HTML but kept for safety */
.siemens-header {
  color: var(--siemens-teal);
  font-weight: 700;
}

/* Utility: visually hidden (Bootstrap has this too, but just in case) */
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}