/* ==========================================================================
   KALA.CLOCK — FULLY RESPONSIVE IoT CLOCK & RUNNING TEXT DASHBOARD
   Auto-adjusts across Mobile, Tablet, and Desktop interfaces.
   Design Tokens:
   - Base Color: #fdfdfd (White)
   - Secondary Color: #2c2c2c (Charcoal Black)
   - Accent Color: #edeae0 (Warm Ecru)
   - Headings: Helvetica, 'Helvetica Neue', Arial, sans-serif
   - Body & Captions: 'Inter', sans-serif (Font Weight: 700)
   ========================================================================== */

/* --- ROOT VARIABLES & RESET --- */
:root {
  --color-base: #fdfdfd;
  --color-secondary: #2c2c2c;
  --color-secondary-light: #3d3d3d;
  --color-secondary-dark: #1a1a1a;
  --color-accent: #edeae0;
  --color-accent-dark: #ded9cb;
  --color-accent-soft: #f7f6f2;
  --color-text-main: #2c2c2c;
  --color-text-muted: #5f5f5f;
  --color-border: #edeae0;
  --color-card-bg: #fdfdfd;
  --color-online: #1e8449;
  --color-offline: #c0392b;
  --color-led-amber: #ffaa33;
  --color-led-red: #ff3b30;

  --shadow-sm: 0 2px 8px rgba(44, 44, 44, 0.06);
  --shadow-md: 0 4px 16px rgba(44, 44, 44, 0.09);
  --shadow-lg: 0 8px 24px rgba(44, 44, 44, 0.14);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --sidebar-width-desktop: 260px;
  --sidebar-width-tablet: 220px;
  --mobile-navbar-height: 64px;
}

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

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

body {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  font-weight: 700;
  background-color: var(--color-base);
  color: var(--color-text-main);
  line-height: 1.5;
  min-height: 100vh;
  overflow-x: hidden;
}

/* --- TYPOGRAPHY --- */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  color: var(--color-secondary);
  letter-spacing: -0.02em;
  font-weight: 700;
}

p,
span,
label,
button,
input,
textarea,
select,
caption,
.status-box {
  font-family:
    "Inter",
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    Roboto,
    sans-serif;
  font-weight: 700;
}

/* ==========================================================================
   MOBILE TOP BAR (Desktop/Tablet: HIDDEN, Mobile: STICKY HEADER)
   ========================================================================== */
.mobile-navbar {
  display: none !important; /* Tersembunyi penuh di Desktop & Tablet */
}

.sidebar-backdrop {
  display: none !important; /* Tersembunyi penuh di Desktop & Tablet */
}

.sidebar-close-btn {
  display: none !important; /* Tersembunyi penuh di Desktop & Tablet */
}

/* ==========================================================================
   CONTAINER 1 (SIDEBAR + MAIN)
   ========================================================================== */
.container1 {
  min-height: 100vh;
  display: flex;
  width: 100%;
  background-color: var(--color-base);
  position: relative;
}

/* ==========================================================================
   SIDEBAR (DESKTOP & TABLET DEFAULT)
   Strict Requirement: Logo in middle of sidebar, top center alignment, 40px top padding
   ========================================================================== */
.sidebar {
  width: var(--sidebar-width-desktop);
  min-height: 100vh;
  padding: 40px 20px 24px 20px; /* 40px padding from top strictly maintained */
  background-color: var(--color-secondary);
  color: var(--color-base);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  align-items: center; /* Top-center alignment / middle of sidebar horizontally */
  border-right: 1px solid var(--color-secondary-light);
  box-shadow: 3px 0 15px rgba(0, 0, 0, 0.08);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
  z-index: 100;
}

/* LOGO WRAPPER */
.logo-wrapper {
  width: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  margin-bottom: 16px;
  text-align: center;
}

.sidebar-logo {
  max-width: 140px;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 4px 10px rgba(0, 0, 0, 0.35));
  transition: transform 0.3s ease;
}

.sidebar-logo:hover {
  transform: scale(1.03);
}

.sidebar-brand-title {
  text-align: center;
  margin-bottom: 28px;
}

.sidebar-brand-title h2 {
  color: var(--color-base);
  font-size: 1.35rem;
  letter-spacing: 0.04em;
  margin-bottom: 4px;
}

.badge-iot {
  display: inline-block;
  background-color: var(--color-accent);
  color: var(--color-secondary);
  font-size: 0.65rem;
  padding: 2px 10px;
  border-radius: 20px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

/* NAVIGATION */
.sidebar nav {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 8px;
  flex: 1;
}

.nav-link {
  color: #cfcfcf;
  text-decoration: none;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.92rem;
  transition: all 0.2s ease-in-out;
  border-left: 3px solid transparent;
}

.nav-link:hover {
  background-color: var(--color-secondary-light);
  color: var(--color-base);
  border-left-color: var(--color-accent);
}

.nav-link.active {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  border-left-color: var(--color-secondary-dark);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.nav-icon {
  font-size: 1.15rem;
  flex-shrink: 0;
}

/* SIDEBAR FOOTER */
.sidebar-footer {
  width: 100%;
  padding-top: 20px;
  border-top: 1px solid var(--color-secondary-light);
  text-align: center;
  margin-top: auto;
}

.system-status-indicator {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-size: 0.8rem;
  color: #c0c0c0;
  margin-bottom: 8px;
}

.indicator-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-online);
  box-shadow: 0 0 6px var(--color-online);
  animation: pulseDot 2s infinite;
  flex-shrink: 0;
}

@keyframes pulseDot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(0.85);
  }
}

.sidebar-version {
  font-size: 0.72rem;
  color: #888888;
}

/* ==========================================================================
   MAIN CONTENT AREA (DESKTOP & TABLET & MOBILE)
   ========================================================================== */
.main {
  flex: 1;
  padding: 36px 44px;
  min-width: 0;
  display: flex;
  flex-direction: column;
  background-color: var(--color-base);
  max-width: 100%;
}

/* ==========================================================================
   HEADER
   ========================================================================== */
.header {
  margin-bottom: 28px;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  flex-wrap: wrap;
  gap: 16px;
  border-bottom: 2px solid var(--color-accent);
  padding-bottom: 20px;
}

.header-text {
  flex: 1 1 320px;
}

.header h1 {
  font-size: clamp(1.6rem, 2.5vw, 2.1rem);
  margin-bottom: 6px;
  color: var(--color-secondary);
  line-height: 1.2;
}

.header p {
  color: var(--color-text-muted);
  font-size: clamp(0.85rem, 1.2vw, 0.95rem);
}

.header-actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.btn-sync-time,
.btn-refresh-conn {
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-secondary);
  background-color: var(--color-secondary);
  color: var(--color-base);
  font-size: 0.88rem;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  white-space: nowrap;
  min-height: 42px;
}

.btn-sync-time {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  border-color: var(--color-accent-dark);
}

.btn-sync-time:hover {
  background-color: var(--color-accent-dark);
  transform: translateY(-1px);
}

.btn-refresh-conn:hover {
  background-color: var(--color-secondary-light);
  transform: translateY(-1px);
}

/* ==========================================================================
   VIRTUAL LED MATRIX CLOCK PREVIEW (RESPONSIVE)
   ========================================================================== */
.preview-panel {
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: clamp(16px, 2.5vw, 24px);
  margin-bottom: 28px;
  box-shadow: var(--shadow-md);
  width: 100%;
}

.preview-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 15px;
  flex-wrap: wrap;
  gap: 10px;
}

.preview-title-box {
  display: flex;
  align-items: center;
  gap: 10px;
}

.preview-title-box h3 {
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  color: var(--color-secondary);
}

.preview-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: var(--color-online);
  display: inline-block;
  box-shadow: 0 0 8px var(--color-online);
  flex-shrink: 0;
}

.preview-meta {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
}

.preview-mode-tag {
  background-color: var(--color-accent-soft);
  padding: 2px 8px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
}

.preview-res {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  padding: 2px 8px;
  border-radius: 4px;
  font-size: 0.75rem;
}

/* LED DISPLAY FRAME & MATRIX SIMULATION */
.led-screen-outer {
  background-color: #121212;
  border-radius: var(--radius-md);
  padding: clamp(8px, 1.5vw, 14px);
  border: 4px solid var(--color-secondary);
  box-shadow:
    inset 0 0 18px rgba(0, 0, 0, 0.85),
    0 4px 14px rgba(0, 0, 0, 0.15);
  width: 100%;
  overflow: hidden;
}

.led-screen-bezel {
  position: relative;
  background-color: #080808;
  border: 2px solid #222;
  border-radius: 8px;
  overflow: hidden;
  min-height: 130px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
}

/* Simulated Dot Matrix Grid Pattern */
.led-matrix-overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: radial-gradient(#000000 30%, transparent 35%);
  background-size: 4px 4px;
  pointer-events: none;
  background-color: rgba(0, 0, 0, 0.25);
  transition: background-color 0.2s ease;
  z-index: 2;
}

.led-screen-display {
  width: 100%;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: clamp(12px, 2vw, 18px) clamp(10px, 2vw, 20px);
  z-index: 1;
  position: relative;
}

.led-clock-box {
  text-align: center;
  margin-bottom: 6px;
  width: 100%;
}

.led-time {
  font-family: "Courier New", Courier, monospace;
  font-size: clamp(1.8rem, 5vw, 2.7rem);
  font-weight: 900;
  letter-spacing: 0.1em;
  color: var(--color-led-amber);
  text-shadow:
    0 0 12px rgba(255, 170, 51, 0.75),
    0 0 24px rgba(255, 170, 51, 0.35);
  line-height: 1.15;
  word-break: keep-all;
  white-space: nowrap;
}

.led-date {
  font-family: "Courier New", Courier, monospace;
  font-size: clamp(0.72rem, 1.8vw, 0.86rem);
  letter-spacing: 0.08em;
  color: #ffd080;
  text-shadow: 0 0 8px rgba(255, 208, 128, 0.5);
  margin-top: 3px;
}

.led-divider {
  width: 90%;
  height: 2px;
  background-color: #332200;
  box-shadow: 0 0 4px var(--color-led-amber);
  margin: 6px auto 10px auto;
}

/* MARQUEE RUNNING TEXT */
.led-ticker-wrapper {
  width: 100%;
  overflow: hidden;
  white-space: nowrap;
  background-color: rgba(0, 0, 0, 0.55);
  padding: 6px 0;
  border-radius: 4px;
}

.led-ticker-text {
  display: inline-block;
  font-family: "Courier New", Courier, monospace;
  font-size: clamp(0.92rem, 2.2vw, 1.15rem);
  font-weight: bold;
  letter-spacing: 0.08em;
  color: var(--color-led-red);
  text-shadow:
    0 0 10px rgba(255, 59, 48, 0.75),
    0 0 20px rgba(255, 59, 48, 0.4);
  animation: scrollLeft 18s linear infinite;
  padding-left: 100%;
}

@keyframes scrollLeft {
  0% {
    transform: translateX(0%);
  }
  100% {
    transform: translateX(-100%);
  }
}

@keyframes scrollRight {
  0% {
    transform: translateX(-100%);
  }
  100% {
    transform: translateX(0%);
  }
}

.preview-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  font-size: 0.78rem;
  color: var(--color-text-muted);
  flex-wrap: wrap;
  gap: 8px;
}

.preview-indicator {
  display: flex;
  align-items: center;
  gap: 6px;
}

.badge-dot-live {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background-color: var(--color-led-red);
  display: inline-block;
  animation: pulseDot 1.5s infinite;
  flex-shrink: 0;
}

.preview-stats {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.stats-sep {
  opacity: 0.5;
}

/* ==========================================================================
   NOTIFICATION / PESAN
   ========================================================================== */
.pesan-alert {
  padding: 0;
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
  font-size: 0.92rem;
  text-align: center;
  transition: all 0.3s ease;
  empty-cells: hide;
}

.pesan-alert:not(:empty) {
  padding: 12px 18px;
  background-color: var(--color-accent);
  border: 1px solid var(--color-secondary);
  color: var(--color-secondary);
  box-shadow: var(--shadow-sm);
}

/* ==========================================================================
   CONTAINER 2 (CARD-CARD CONTROLS - 2 KOLOM RAPI)
   Strict Requirement: Exactly matches 113238.png (2 Column Grid on Desktop/Tablet)
   ========================================================================== */
.container2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr); /* 2 Kolom Seimbang */
  gap: 24px;
  width: 100%;
  margin-bottom: 28px;
}

/* CARD */
.card {
  padding: clamp(18px, 2.5vw, 24px);
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s ease;
  min-width: 0;
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-accent-dark);
}

.card-header-icon {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.card-icon {
  font-size: 1.25rem;
  flex-shrink: 0;
}

.card h3 {
  font-size: clamp(1.05rem, 1.4vw, 1.2rem);
  color: var(--color-secondary);
}

.card-desc {
  margin-bottom: 16px;
  color: var(--color-text-muted);
  font-size: 0.85rem;
  font-weight: 700;
}

/* CARD 1: DEVICE DETAILS & STATUS STACK */
.device-details {
  background-color: var(--color-accent);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  border: 1px solid rgba(44, 44, 44, 0.08);
}

.device-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  margin-bottom: 4px;
  flex-wrap: wrap;
  gap: 4px;
}

.device-row:last-child {
  margin-bottom: 0;
}

.device-label {
  color: var(--color-text-muted);
}

.device-val {
  color: var(--color-secondary);
}

.topic-code {
  font-family: monospace;
  font-size: 0.75rem;
  background-color: var(--color-base);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--color-border);
  word-break: break-all;
}

.status-stack {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 18px;
  flex: 1;
}

/* STATUS BOX (Preserved from index2) */
.status-box {
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 0.84rem;
  transition: background-color 0.3s ease;
  letter-spacing: 0.02em;
  min-height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.online {
  background-color: var(--color-online);
  color: var(--color-base);
}

.offline {
  background-color: var(--color-offline);
  color: var(--color-base);
}

/* ==========================================================================
   CUSTOM POWER SLIDE / SWIPE SWITCH
   Inactive: White bg, #3D2B1F outline (4px)
   Circle/dot: White, #3D2B1F outline (6px)
   Active: #966E53 bg, retaining 4px outline and circle/dot
   ========================================================================== */
.power-switch-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--color-accent);
  padding: 10px 14px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
  border: 1px solid var(--color-accent-dark);
}

.power-switch-label {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.power-title {
  font-size: 0.86rem;
  color: var(--color-secondary);
  font-weight: 700;
}

.power-state-badge {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--color-online);
  letter-spacing: 0.05em;
}

.power-state-badge.off {
  color: var(--color-offline);
}

.custom-slide-switch {
  position: relative;
  width: 72px;
  height: 38px;
  background-color: #ffffff;
  border: 4px solid #3d2b1f;
  border-radius: 38px;
  cursor: pointer;
  outline: none;
  padding: 0;
  transition:
    background-color 0.25s ease,
    border-color 0.25s ease;
  display: inline-flex;
  align-items: center;
  box-sizing: border-box;
  flex-shrink: 0;
  touch-action: manipulation;
}

.custom-slide-switch .switch-dot {
  position: absolute;
  left: 2px;
  top: 50%;
  transform: translateY(-50%);
  width: 28px;
  height: 28px;
  background-color: #ffffff;
  border: 6px solid #3d2b1f;
  border-radius: 50%;
  box-sizing: border-box;
  transition: transform 0.25s cubic-bezier(0.4, 0, 0.2, 1);
  pointer-events: none;
}

/* Active State: Background #966E53 while retaining outline and circle/dot */
.custom-slide-switch.active {
  background-color: #be8c6a;
  border: 4px solid #3d2b1f;
}

.custom-slide-switch.active .switch-dot {
  transform: translate(34px, -50%);
  background-color: #ffffff;
  border: 6px solid #3d2b1f;
}

/* SLIDER CONTROLS */
.slider-control-group {
  margin-bottom: 16px;
}

.slider-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 8px;
  flex-wrap: wrap;
  gap: 6px;
}

.form-label {
  font-size: 0.85rem;
  color: var(--color-secondary);
}

.slider-badge {
  background-color: var(--color-accent);
  color: var(--color-secondary);
  padding: 2px 8px;
  border-radius: 6px;
  font-size: 0.8rem;
  border: 1px solid var(--color-accent-dark);
}

/* CUSTOM RANGE SLIDER (Styling with #2c2c2c & #edeae0) */
.form-range {
  width: 100%;
  height: 10px;
  border-radius: 6px;
  background: var(--color-accent);
  outline: none;
  -webkit-appearance: none;
  cursor: pointer;
}

.form-range::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-base);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
  cursor: pointer;
  transition:
    transform 0.1s ease,
    background-color 0.2s ease;
}

.form-range::-webkit-slider-thumb:hover,
.form-range::-webkit-slider-thumb:active {
  transform: scale(1.15);
  background-color: var(--color-secondary-light);
}

.form-range::-moz-range-thumb {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  border: 2px solid var(--color-base);
  box-shadow: 0 1px 6px rgba(0, 0, 0, 0.35);
  cursor: pointer;
}

.preset-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 18px;
}

.btn-preset {
  min-height: 38px;
  padding: 8px 6px;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-accent);
  color: var(--color-secondary);
  font-size: 0.82rem;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  text-overflow: ellipsis;
}

.btn-preset:hover {
  background-color: var(--color-secondary);
  color: var(--color-base);
  border-color: var(--color-secondary);
}

/* CLOCK OPTIONS IN CARD 3 */
.clock-quick-display {
  background-color: var(--color-accent);
  padding: 14px;
  border-radius: var(--radius-sm);
  text-align: center;
  margin-bottom: 14px;
  border: 1px solid var(--color-accent-dark);
}

.clock-display-val {
  display: block;
  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: clamp(1.5rem, 2.5vw, 1.9rem);
  color: var(--color-secondary);
  line-height: 1.15;
  letter-spacing: 0.05em;
}

.clock-timezone {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* TIMEZONE CONTROLS (CARD 3) */
.timezone-input-wrap {
  display: flex;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.timezone-num-input {
  width: 75px !important;
  text-align: center;
  font-weight: 700;
  padding: 8px !important;
}

.timezone-quick-pills {
  display: flex;
  gap: 6px;
  flex: 1;
  min-width: 140px;
}

.btn-tz-pill {
  flex: 1;
  padding: 8px 4px;
  font-size: 0.74rem;
  border-radius: 6px;
  border: 1px solid var(--color-border);
  background-color: var(--color-accent);
  color: var(--color-secondary);
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  text-align: center;
  font-weight: 700;
}

.btn-tz-pill:hover {
  background-color: var(--color-secondary-light);
  color: var(--color-base);
}

.btn-tz-pill.active {
  background-color: var(--color-secondary);
  color: var(--color-base);
  border-color: var(--color-secondary);
}

/* MANUAL TIME GRID (CARD 3) */
.manual-time-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.time-input-field,
.date-input-field {
  padding: 8px 10px;
  font-size: 0.84rem;
}

.clock-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 18px;
  flex: 1;
}

.checkbox-option {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.84rem;
  color: var(--color-secondary);
  cursor: pointer;
  user-select: none;
  min-height: 30px;
}

.checkbox-option input[type="checkbox"] {
  accent-color: var(--color-secondary);
  width: 18px;
  height: 18px;
  cursor: pointer;
  flex-shrink: 0;
}

/* FORM CONTROLS IN CARD 4 */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.mb-2 {
  margin-bottom: 10px;
}
.mb-3 {
  margin-bottom: 14px;
}

.form-control,
.form-select {
  width: 100%;
  padding: 10px 12px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: var(--color-base);
  color: var(--color-secondary);
  font-size: 16px;
  transition:
    border-color 0.2s ease,
    box-shadow 0.2s ease;
  resize: vertical;
}

.form-control:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(44, 44, 44, 0.1);
}

/* CARD ACTION BUTTONS */
.btn-card {
  margin-top: auto;
  min-height: 44px;
  padding: 11px 18px;
  border: none;
  border-radius: var(--radius-sm);
  background-color: var(--color-secondary);
  color: var(--color-base);
  font-size: 0.88rem;
  cursor: pointer;
  transition:
    background-color 0.2s ease,
    transform 0.1s ease;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-card:hover {
  background-color: var(--color-secondary-light);
  transform: translateY(-1px);
}

/* ==========================================================================
   PRIMARY ACTION DOCK (KIRIM REAL-TIME MQTT)
   ========================================================================== */
.action-dock {
  background-color: var(--color-secondary);
  color: var(--color-base);
  border-radius: var(--radius-md);
  padding: clamp(18px, 2.5vw, 26px) clamp(18px, 3vw, 32px);
  margin-bottom: 28px;
  box-shadow: var(--shadow-lg);
  width: 100%;
}

.action-dock-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
}

.action-info {
  flex: 1 1 300px;
}

.action-info h4 {
  color: var(--color-base);
  font-size: clamp(1.1rem, 1.6vw, 1.3rem);
  margin-bottom: 4px;
}

.action-info p {
  color: #b8b8b8;
  font-size: 0.85rem;
  max-width: 650px;
}

.btn-send-main {
  min-height: 50px;
  padding: 14px 28px;
  border: 2px solid var(--color-accent);
  border-radius: var(--radius-sm);
  background-color: var(--color-accent);
  color: var(--color-secondary);
  font-size: 1rem;
  letter-spacing: 0.04em;
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
  transition: all 0.2s ease;
  white-space: nowrap;
  display: flex;
  align-items: center;
  justify-content: center;
}

.btn-send-main:hover {
  background-color: var(--color-base);
  border-color: var(--color-base);
  transform: translateY(-2px);
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.35);
}

/* ==========================================================================
   PANDUAN SECTION
   ========================================================================== */
.panduan-card {
  margin-top: 10px;
  background-color: var(--color-card-bg);
  border: 1px solid var(--color-border);
}

.panduan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.panduan-item {
  display: flex;
  gap: 14px;
  background-color: var(--color-base);
  padding: 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border);
}

.panduan-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background-color: var(--color-secondary);
  color: var(--color-base);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  font-size: 0.9rem;
}

.panduan-content strong {
  display: block;
  font-size: 0.88rem;
  color: var(--color-secondary);
  margin-bottom: 4px;
}

.panduan-content p {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ==========================================================================
   BREAKPOINTS & RESPONSIVE DESIGN
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. DESKTOP WIDE & STANDARD (>= 1025px)
   -------------------------------------------------------------------------- */
@media (min-width: 1025px) {
  .sidebar {
    width: var(--sidebar-width-desktop);
  }

  .container2 {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* --------------------------------------------------------------------------
   2. TABLET INTERFACE (769px to 1024px)
   -------------------------------------------------------------------------- */
@media (max-width: 1024px) and (min-width: 769px) {
  .sidebar {
    width: var(--sidebar-width-tablet);
    padding: 40px 14px 20px 14px;
  }

  .sidebar-logo {
    max-width: 115px;
  }

  .sidebar-brand-title h2 {
    font-size: 1.15rem;
  }

  .nav-link {
    padding: 10px 12px;
    font-size: 0.85rem;
  }

  .main {
    padding: 26px 24px;
  }

  .container2 {
    grid-template-columns: repeat(2, 1fr); /* 2 Kolom Seimbang di Tablet */
    gap: 18px;
  }

  /* Responsive button sizes on Tablet */
  .btn-sync-time,
  .btn-refresh-conn {
    padding: 9px 14px;
    font-size: 0.82rem;
    min-height: 38px;
  }

  .preset-buttons {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }

  .btn-preset {
    padding: 7px 4px;
    font-size: 0.73rem;
    min-height: 36px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .btn-card {
    padding: 10px 14px;
    font-size: 0.84rem;
    min-height: 40px;
  }

  .btn-send-main {
    padding: 12px 22px;
    font-size: 0.92rem;
    min-height: 46px;
  }
}

/* --------------------------------------------------------------------------
   3. MOBILE INTERFACE (<= 768px)
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  .container1 {
    flex-direction: column;
  }

  /* TAMPILKAN MOBILE TOP BAR */
  .mobile-navbar {
    display: flex !important;
    position: sticky;
    top: 0;
    left: 0;
    right: 0;
    height: var(--mobile-navbar-height);
    background-color: var(--color-secondary);
    color: var(--color-base);
    padding: 0 16px;
    z-index: 1000;
    border-bottom: 1px solid var(--color-secondary-light);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.25);
    align-items: center;
    justify-content: space-between;
  }

  .mobile-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
  }

  /* Menggunakan Logo.png normal pada mobile */
  .mobile-logo-img {
    max-height: 40px;
    max-width: 100px;
    object-fit: contain;
    display: block;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
  }

  .mobile-brand-info {
    display: flex;
    flex-direction: column;
  }

  .mobile-brand-title {
    font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
    font-size: 1.05rem;
    color: var(--color-base);
    line-height: 1.1;
  }

  .mobile-brand-sub {
    font-size: 0.62rem;
    color: var(--color-accent);
    letter-spacing: 0.05em;
    text-transform: uppercase;
  }

  .mobile-nav-actions {
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .mobile-status-pill {
    display: flex;
    align-items: center;
    gap: 6px;
    background-color: var(--color-secondary-light);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.72rem;
    color: #d0d0d0;
  }

  /* HAMBURGER BUTTON — Sangat Jelas & Kontras Tinggi */
  .mobile-menu-btn {
    width: 44px;
    height: 44px;
    background-color: var(--color-secondary-light);
    border: 1px solid rgba(237, 234, 224, 0.4);
    border-radius: var(--radius-sm);
    cursor: pointer;
    display: flex !important;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    padding: 8px;
    flex-shrink: 0;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
    transition: background-color 0.2s ease;
  }

  .mobile-menu-btn:hover,
  .mobile-menu-btn:active {
    background-color: #4a4a4a;
  }

  .hamburger-bar {
    width: 22px;
    height: 3px;
    background-color: #fdfdfd !important;
    border-radius: 2px;
    display: block !important;
    transition:
      transform 0.3s ease,
      opacity 0.3s ease;
  }

  /* Animasi Hamburger saat drawer terbuka */
  .sidebar-open .mobile-menu-btn .hamburger-bar:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  .sidebar-open .mobile-menu-btn .hamburger-bar:nth-child(2) {
    opacity: 0;
  }
  .sidebar-open .mobile-menu-btn .hamburger-bar:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }

  /* BACKDROP OVERLAY */
  .sidebar-backdrop {
    display: block !important;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.65);
    backdrop-filter: blur(2px);
    -webkit-backdrop-filter: blur(2px);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition:
      opacity 0.3s ease,
      visibility 0.3s ease;
  }

  .sidebar-open .sidebar-backdrop {
    opacity: 1;
    visibility: visible;
  }

  /* SIDEBAR DRAWER */
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(300px, 82vw);
    height: 100vh;
    padding: 40px 20px 24px 20px;
    z-index: 1200;
    transform: translateX(-100%);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: 4px 0 25px rgba(0, 0, 0, 0.4);
  }

  .sidebar-open .sidebar {
    transform: translateX(0);
  }

  /* TOMBOL TUTUP DRAWER (Hanya di Layar Mobile) */
  .sidebar-close-btn {
    display: flex !important;
    position: absolute;
    top: 12px;
    right: 12px;
    width: 36px;
    height: 36px;
    border-radius: 50%;
    background-color: var(--color-secondary-light);
    color: var(--color-base);
    border: 1px solid rgba(255, 255, 255, 0.2);
    font-size: 1rem;
    cursor: pointer;
    align-items: center;
    justify-content: center;
    z-index: 10;
  }

  .main {
    padding: 18px 14px;
  }

  /* HEADER DI MOBILE */
  .header {
    flex-direction: column;
    align-items: stretch;
    gap: 14px;
    margin-bottom: 20px;
    padding-bottom: 16px;
  }

  .header-text {
    flex: initial !important;
    width: 100%;
  }

  .header-actions {
    display: grid;
    grid-template-columns: 1fr;
    gap: 8px;
    width: 100%;
  }

  /* RESPONSIVE BUTTONS DI MOBILE */
  .btn-sync-time,
  .btn-refresh-conn {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.88rem;
    min-height: 44px;
  }

  .btn-card {
    width: 100%;
    padding: 12px 16px;
    font-size: 0.9rem;
    min-height: 46px;
  }

  .btn-preset {
    padding: 10px 6px;
    font-size: 0.78rem;
    min-height: 42px;
  }

  .btn-send-main {
    width: 100%;
    padding: 14px 20px;
    font-size: 0.96rem;
    min-height: 48px;
  }

  .nav-link {
    padding: 14px 18px;
    font-size: 0.95rem;
    min-height: 48px;
  }

  /* PREVIEW PANEL DI MOBILE */
  .preview-panel {
    padding: 14px 12px;
    margin-bottom: 20px;
  }

  .preview-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .led-screen-outer {
    padding: 8px;
    border-width: 3px;
  }

  .led-screen-display {
    padding: 14px 8px;
  }

  .led-time {
    font-size: clamp(1.75rem, 7.5vw, 2.3rem);
    letter-spacing: 0.08em;
  }

  .led-date {
    font-size: clamp(0.7rem, 2.8vw, 0.82rem);
  }

  .led-ticker-text {
    font-size: clamp(0.9rem, 3.8vw, 1.05rem);
  }

  .preview-footer {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
  }

  /* KARTU KONTROL DI MOBILE: 1 Kolom Penuh */
  .container2 {
    grid-template-columns: 1fr;
    gap: 16px;
    margin-bottom: 20px;
  }

  .card {
    padding: 18px 16px;
  }

  /* ACTION DOCK DI MOBILE */
  .action-dock {
    padding: 20px 16px;
    margin-bottom: 20px;
  }

  .action-dock-inner {
    flex-direction: column;
    align-items: stretch;
    text-align: center;
  }

  .action-info {
    flex: initial !important;
    width: 100%;
  }

  .action-info p {
    margin-bottom: 12px;
  }

  /* PANDUAN GRID DI MOBILE */
  .panduan-grid {
    grid-template-columns: 1fr;
    gap: 12px;
  }
}

/* --------------------------------------------------------------------------
   4. EXTRA SMALL PHONES (<= 400px)
   -------------------------------------------------------------------------- */
@media (max-width: 400px) {
  .mobile-brand-title {
    font-size: 0.95rem;
  }

  .led-time {
    font-size: 1.6rem;
    letter-spacing: 0.06em;
  }

  .preset-buttons {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .btn-preset {
    font-size: 0.76rem;
  }
}