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

/* SDK-08: Use --tg-viewport-stable-height (NOT --tg-viewport-height)
   to prevent layout jump when keyboard opens on login password field */
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  background-color: var(--tg-theme-bg-color, #ffffff);
  color: var(--tg-theme-text-color, #000000);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  min-height: var(--tg-viewport-stable-height, 100vh);
  display: flex;
  flex-direction: column;
}

/* === Screens === */
.screen {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}

.screen-content {
  width: 100%;
  max-width: 400px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* === Typography === */
.app-title {
  font-size: 24px;
  font-weight: 700;
  text-align: center;
}

h2 {
  font-size: 20px;
  font-weight: 600;
}

.hint {
  color: var(--tg-theme-hint-color, #999999);
  font-size: 14px;
  text-align: center;
}

/* === Form Inputs === */
.input-field {
  width: 100%;
  padding: 12px 16px;
  font-size: 16px;
  border: 1px solid var(--tg-theme-hint-color, #cccccc);
  border-radius: 12px;
  background-color: var(--tg-theme-secondary-bg-color, #f4f4f5);
  color: var(--tg-theme-text-color, #000000);
  outline: none;
  transition: border-color 0.2s;
}

.input-field:focus {
  border-color: var(--tg-theme-button-color, #2481cc);
}

.input-field::placeholder {
  color: var(--tg-theme-hint-color, #999999);
}

/* === Buttons === */
.btn-primary {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background-color: var(--tg-theme-button-color, #2481cc);
  color: var(--tg-theme-button-text-color, #ffffff);
  transition: opacity 0.2s;
}

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

.btn-primary:active:not(:disabled) {
  opacity: 0.8;
}

.btn-secondary {
  width: 100%;
  padding: 14px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  background-color: var(--tg-theme-secondary-bg-color, #f4f4f5);
  color: var(--tg-theme-text-color, #000000);
  transition: opacity 0.2s;
}

.btn-secondary:active {
  opacity: 0.8;
}

/* === File Drop Zones (FE-03) === */
.file-zone {
  border: 2px dashed var(--tg-theme-hint-color, #cccccc);
  border-radius: 12px;
  padding: 20px;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.2s, background-color 0.2s;
  background-color: var(--tg-theme-secondary-bg-color, #f4f4f5);
  position: relative;
}

.file-zone.dragover {
  border-color: var(--tg-theme-button-color, #2481cc);
  background-color: var(--tg-theme-bg-color, #ffffff);
}

.file-zone.has-file {
  border-style: solid;
  border-color: var(--tg-theme-button-color, #2481cc);
}

.file-zone.has-partial {
  border-style: dashed;
  border-color: var(--tg-theme-button-color, #2481cc);
}

.file-input-hidden {
  position: absolute;
  width: 0;
  height: 0;
  opacity: 0;
  overflow: hidden;
}

.file-zone-content,
.file-zone-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.file-zone-icon {
  font-size: 32px;
}

.file-zone-text {
  color: var(--tg-theme-hint-color, #999999);
  font-size: 14px;
}

.file-zone-hint {
  font-size: 12px;
  color: var(--tg-theme-hint-color, #bbbbbb);
}

/* File rows inside combined zone */
.file-zone-files {
  width: 100%;
}

.file-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 0;
}

.file-row + .file-row {
  border-top: 1px solid var(--tg-theme-hint-color, #e0e0e0);
}

.file-row-icon {
  font-size: 20px;
  flex-shrink: 0;
}

.file-row-name {
  flex: 1;
  font-size: 13px;
  font-weight: 500;
  word-break: break-all;
}

.file-row-pending .file-row-name,
.pending-text {
  color: var(--tg-theme-hint-color, #aaaaaa);
  font-weight: 400;
}

.file-zone-selected {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.file-name {
  font-size: 14px;
  font-weight: 500;
  word-break: break-all;
}

.btn-clear-file {
  background: none;
  border: none;
  font-size: 20px;
  cursor: pointer;
  color: var(--tg-theme-hint-color, #999999);
  padding: 4px 8px;
}

/* === Progress Bar (FE-05) === */
.progress-bar {
  width: 100%;
  height: 8px;
  background-color: var(--tg-theme-secondary-bg-color, #e0e0e0);
  border-radius: 4px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background-color: var(--tg-theme-button-color, #2481cc);
  border-radius: 4px;
  transition: width 0.15s ease;
}

.progress-text {
  text-align: center;
  font-size: 14px;
  color: var(--tg-theme-hint-color, #999999);
  margin-top: 8px;
}

/* === Error Messages === */
.error-message {
  color: #e53935;
  font-size: 13px;
  padding: 4px 0;
}

/* === Result Screen === */
.result-icon {
  font-size: 64px;
  text-align: center;
  color: #4caf50;
}

/* === Utility === */
.hidden {
  display: none !important;
}