/* ================================================================
   Tunable Reflectarray Antennas Driver — Web UI Stylesheet
   ================================================================ */

/* ---- CSS Custom Properties (Design Tokens) ---- */
:root {
  --color-bg: #F0F0F0;
  --color-surface: #FFFFFF;
  --color-accent: #C87533;
  --color-accent-hover: #A8612A;
  --color-accent-light: #E8C9A8;
  --color-title: #1A6B8A;
  --color-text: #333333;
  --color-text-muted: #666666;
  --color-border: #CCCCCC;
  --color-input-bg: #FFFFFF;
  --color-input-border: #C87533;
  --color-success: #2E7D32;
  --color-error: #C62828;
  --color-danger: #B71C1C;
  --color-danger-hover: #8E1515;

  --font-family: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
  --border-radius: 4px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 2px 8px rgba(0, 0, 0, 0.15);
  --transition: 0.2s ease;
}

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

html {
  font-size: 14px;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  padding: 16px;
}

/* ---- Main Container ---- */
.container {
  max-width: 960px;
  margin: 0 auto;
  background: var(--color-surface);
  border-radius: 8px;
  box-shadow: var(--shadow-md);
  padding: 20px 24px;
}

/* ================================================================
   HEADER — Logos + Title
   ================================================================ */
.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--color-accent-light);
  margin-bottom: 20px;
}

.header__logo {
  height: 64px;
  width: auto;
  object-fit: contain;
  flex-shrink: 0;
}

.header__title-block {
  text-align: center;
  flex: 1;
  padding: 0 16px;
}

.header__title {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-title);
  line-height: 1.3;
}

.header__subtitle {
  font-size: 1rem;
  font-weight: 400;
  color: var(--color-text-muted);
  margin-top: 4px;
}

/* ================================================================
   CONTROL BAR — Freq, Vref, Status
   ================================================================ */
.control-bar {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 20px;
  flex-wrap: wrap;
}

.control-bar__group {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.control-bar__field {
  display: flex;
  align-items: center;
  gap: 8px;
}

.control-bar__field label {
  font-weight: 600;
  min-width: 40px;
  color: var(--color-text);
}

.control-bar__field input {
  width: 120px;
  padding: 6px 10px;
  border: 1.5px solid var(--color-input-border);
  border-radius: var(--border-radius);
  background: var(--color-input-bg);
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--color-text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.control-bar__field input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(200, 117, 51, 0.2);
}

/* Status indicator */
.status {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--color-text-muted);
}

.status__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-border);
  transition: background-color 0.3s ease;
  flex-shrink: 0;
}

.status__dot--success {
  background-color: var(--color-success);
  box-shadow: 0 0 6px rgba(46, 125, 50, 0.5);
}

.status__dot--error {
  background-color: var(--color-error);
  box-shadow: 0 0 6px rgba(198, 40, 40, 0.5);
}

.status__text {
  max-width: 200px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ================================================================
   PRESETS BAR — Quick-fill dropdown
   ================================================================ */
.presets-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding: 10px 14px;
  background: #FAFAFA;
  border: 1px solid var(--color-border);
  border-radius: var(--border-radius);
}

.presets-bar label {
  font-weight: 600;
  color: var(--color-text);
  flex-shrink: 0;
}

.presets-bar select {
  flex: 1;
  padding: 6px 10px;
  border: 1.5px solid var(--color-input-border);
  border-radius: var(--border-radius);
  background: var(--color-input-bg);
  font-family: var(--font-family);
  font-size: 0.9rem;
  color: var(--color-text);
  cursor: pointer;
  min-width: 0;
}

.presets-bar select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(200, 117, 51, 0.2);
}

.btn--small {
  flex: 0 0 auto;
  padding: 6px 16px;
  font-size: 0.85rem;
}

/* ================================================================
   CHANNEL GRID — 48 voltage inputs (8 rows × 6 columns)
   ================================================================ */
.channel-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 6px 12px;
  margin-bottom: 20px;
}

.channel-cell {
  display: flex;
  align-items: center;
  gap: 4px;
}

.channel-cell label {
  font-size: 0.8rem;
  font-weight: 600;
  min-width: 28px;
  color: var(--color-text);
}

.channel-cell input {
  flex: 1;
  padding: 5px 8px;
  border: 1.5px solid var(--color-input-border);
  border-radius: var(--border-radius);
  background: var(--color-input-bg);
  font-family: var(--font-family);
  font-size: 0.85rem;
  color: var(--color-text);
  min-width: 0;
  transition: border-color var(--transition), box-shadow var(--transition);
}

.channel-cell input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(200, 117, 51, 0.2);
}

/* ================================================================
   ACTION BUTTONS — LOAD, SEND, RESET, STOP
   ================================================================ */
.actions {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-top: 16px;
  border-top: 2px solid var(--color-accent-light);
}

.btn {
  flex: 1;
  padding: 10px 16px;
  border: none;
  border-radius: var(--border-radius);
  font-family: var(--font-family);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: background-color var(--transition), transform 0.1s ease, box-shadow var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

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

.btn--primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

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

.btn--danger {
  background-color: var(--color-danger);
  color: #FFFFFF;
  box-shadow: var(--shadow-sm);
}

.btn--danger:hover {
  background-color: var(--color-danger-hover);
  box-shadow: var(--shadow-md);
}

/* Hidden file input for LOAD button */
#fileInput {
  display: none;
}

/* ================================================================
   TOAST NOTIFICATION
   ================================================================ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 24px;
  border-radius: 6px;
  color: #FFFFFF;
  font-weight: 600;
  font-size: 0.9rem;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  z-index: 1000;
  pointer-events: none;
}

.toast--visible {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.toast--success {
  background-color: var(--color-success);
}

.toast--error {
  background-color: var(--color-error);
}

/* ================================================================
   RESPONSIVE — Phone screens
   ================================================================ */
@media (max-width: 700px) {
  html {
    font-size: 13px;
  }

  .container {
    padding: 14px 12px;
  }

  .header {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
  }

  .header__logo {
    height: 48px;
  }

  .header__title-block {
    flex: 1 1 100%;
    order: 1;
  }

  .control-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }

  .control-bar__field input {
    width: 100%;
  }

  .presets-bar {
    flex-wrap: wrap;
  }

  .presets-bar .btn--small {
    flex: 1 1 100%;
  }

  .channel-grid {
    gap: 6px 8px;
  }

  .actions {
    flex-wrap: wrap;
    gap: 8px;
  }

  .btn {
    flex: 1 1 45%;
  }
}