/* ══════════════════════════════════════════════════════════
   IoT Platform — Shared Dashboard Design System
   Used by: channel_dashboard, super_dashboard, devices, control
   ══════════════════════════════════════════════════════════ */

/* ── Tokens ───────────────────────────────────────────────── */
:root {
  --sb-w: 240px;
  --sb-bg: #0f172a;
  --sb-border: rgba(255,255,255,.06);
  --sb-text: #94a3b8;
  --sb-hover-bg: #1e293b;
  --sb-active-bg: rgba(59,130,246,.18);
  --sb-active-text: #60a5fa;
  --sb-section-label: #475569;

  --page-bg: #f0f4f8;
  --card: #fff;
  --card-border: rgba(0,0,0,.07);
  --shadow-sm: 0 2px 10px rgba(0,0,0,.06);
  --shadow-md: 0 4px 18px rgba(0,0,0,.09);
  --shadow-lg: 0 10px 36px rgba(0,0,0,.13);

  --text-h: #0f172a;
  --text-p: #475569;
  --text-muted: #94a3b8;

  --blue:        #3b82f6;
  --blue-dark:   #1d4ed8;
  --blue-bg:     #eff6ff;
  --blue-text:   #1d4ed8;
  --green:       #22c55e;
  --green-dark:  #15803d;
  --green-bg:    #f0fdf4;
  --amber:       #f59e0b;
  --amber-bg:    #fffbeb;
  --red:         #ef4444;
  --red-bg:      #fef2f2;
  --slate:       #64748b;

  --r-sm: 8px;  --r-md: 12px;  --r-lg: 16px;  --r-xl: 20px;
  --ease: .2s cubic-bezier(.4,0,.2,1);
}

/* ── Reset ────────────────────────────────────────────────── */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter','Segoe UI',-apple-system,BlinkMacSystemFont,sans-serif;
  background: var(--page-bg);
  color: var(--text-h);
  line-height: 1.6;
  display: flex;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ══════════════════════════════════════════════════════════
   SIDEBAR
   ══════════════════════════════════════════════════════════ */
.sidebar {
  width: var(--sb-w);
  background: var(--sb-bg);
  height: 100vh;
  position: fixed;
  top: 0; left: 0;
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  z-index: 200;
  border-right: 1px solid var(--sb-border);
  scrollbar-width: none;
}
.sidebar::-webkit-scrollbar { display: none; }

/* Logo */
.sb-logo {
  padding: 22px 20px 18px;
  border-bottom: 1px solid var(--sb-border);
  display: flex;
  align-items: center;
  gap: 10px;
}
.sb-logo-icon {
  width: 34px; height: 34px;
  background: linear-gradient(135deg,#3b82f6,#1d4ed8);
  border-radius: 8px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  flex-shrink: 0;
}
.sb-logo-text {
  font-weight: 800;
  font-size: 1rem;
  color: #f1f5f9;
  letter-spacing: -.02em;
  line-height: 1.2;
}
.sb-logo-sub {
  font-size: .65rem;
  color: var(--sb-text);
  font-weight: 500;
  display: block;
  margin-top: 1px;
}

/* Nav sections */
.sb-section-label {
  padding: 16px 16px 6px;
  font-size: .62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--sb-section-label);
}
.sb-nav {
  padding: 4px 10px 8px;
  display: flex;
  flex-direction: column;
  gap: 1px;
}
.sb-nav a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  color: var(--sb-text);
  text-decoration: none;
  font-size: .875rem;
  font-weight: 500;
  transition: background var(--ease), color var(--ease);
  position: relative;
}
.sb-nav a .nav-icon { font-size: 1rem; width: 20px; text-align: center; flex-shrink: 0; }
.sb-nav a .nav-label { flex: 1; }
.sb-nav a:hover  { background: var(--sb-hover-bg); color: #e2e8f0; }
.sb-nav a.active { background: var(--sb-active-bg); color: var(--sb-active-text); font-weight: 700; }

.sb-divider { height: 1px; background: var(--sb-border); margin: 8px 10px; }

/* Channel info box */
.sb-channel-box {
  margin: 8px 10px;
  padding: 10px 12px;
  background: rgba(255,255,255,.04);
  border-radius: var(--r-md);
  border: 1px solid var(--sb-border);
}
.sb-channel-label {
  font-size: .6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  color: #475569;
  margin-bottom: 4px;
}
.sb-channel-name {
  font-size: .82rem;
  font-weight: 700;
  color: #e2e8f0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.sb-channel-key {
  font-size: .7rem;
  color: #60a5fa;
  font-family: monospace;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Bottom area */
.sb-bottom {
  margin-top: auto;
  padding: 10px;
  border-top: 1px solid var(--sb-border);
}
.sb-logout {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 10px;
  border-radius: var(--r-sm);
  color: #ef4444;
  text-decoration: none;
  font-size: .875rem;
  font-weight: 600;
  transition: background var(--ease);
  cursor: pointer;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
}
.sb-logout:hover { background: rgba(239,68,68,.12); }

/* ══════════════════════════════════════════════════════════
   MAIN CONTENT
   ══════════════════════════════════════════════════════════ */
.main {
  margin-left: var(--sb-w);
  flex: 1;
  padding: 28px 32px 72px;
  min-height: 100vh;
}

/* ── Topbar ── */
.topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 14px;
}
.topbar-title { font-size: 1.55rem; font-weight: 800; color: var(--text-h); margin: 0 0 3px; }
.topbar-sub   { font-size: .85rem; color: var(--text-muted); margin: 0; }
.topbar-right { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }

/* API Key Pill */
.apikey-pill {
  display: flex; align-items: center; gap: 8px;
  background: var(--card); border: 1px solid var(--card-border);
  border-radius: var(--r-md); padding: 7px 13px;
  box-shadow: var(--shadow-sm);
}
.apikey-pill .ap-label {
  font-size: .65rem; font-weight: 700;
  text-transform: uppercase; letter-spacing: .06em;
  color: var(--text-muted);
}
.apikey-pill code {
  font-family: 'Fira Code',monospace;
  font-size: .78rem; font-weight: 700;
  color: var(--blue-text); background: var(--blue-bg);
  padding: 2px 7px; border-radius: 5px;
  cursor: pointer; letter-spacing: .04em;
  transition: opacity var(--ease);
}
.apikey-pill code:hover { opacity: .75; }

/* ── Stats grid ── */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px,1fr));
  gap: 16px;
  margin-bottom: 28px;
}
.stat-card {
  background: var(--card);
  border-radius: var(--r-lg);
  padding: 18px 20px;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--card-border);
  display: flex; align-items: center; gap: 14px;
  transition: box-shadow var(--ease), transform var(--ease);
}
.stat-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.stat-icon {
  width: 46px; height: 46px;
  border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; flex-shrink: 0;
}
.si-blue  { background: var(--blue-bg); }
.si-green { background: var(--green-bg); }
.si-amber { background: var(--amber-bg); }
.si-red   { background: var(--red-bg); }
.si-slate { background: #f1f5f9; }
.stat-body {}
.stat-value { font-size: 1.65rem; font-weight: 800; color: var(--text-h); line-height: 1; }
.stat-label { font-size: .7rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--text-muted); margin-top: 4px; }

/* ── Card ── */
.card {
  background: var(--card);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--card-border);
  overflow: hidden;
}
.card-hd {
  padding: 16px 20px 14px;
  border-bottom: 1px solid #f1f5f9;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
}
.card-hd h2,.card-hd h3 { font-size: 1rem; font-weight: 700; color: var(--text-h); }
.card-bd { padding: 20px; }
.card-ft { padding: 14px 20px; background: #f8fafc; border-top: 1px solid #f1f5f9; }

/* ── Buttons ── */
.btn {
  display: inline-flex; align-items: center; gap: 7px;
  padding: 10px 20px; border-radius: var(--r-sm); border: none;
  font-size: .875rem; font-weight: 700; cursor: pointer;
  transition: all var(--ease); text-decoration: none;
  white-space: nowrap; line-height: 1;
}
.btn:hover   { transform: translateY(-1px); }
.btn:active  { transform: translateY(0); }
.btn-primary { background: #1e293b; color: #fff; }
.btn-primary:hover { background: #334155; box-shadow: 0 4px 14px rgba(0,0,0,.22); }
.btn-blue    { background: var(--blue); color: #fff; }
.btn-blue:hover { background: #2563eb; box-shadow: 0 4px 14px rgba(59,130,246,.35); }
.btn-green   { background: var(--green); color: #fff; }
.btn-green:hover { background: var(--green-dark); box-shadow: 0 4px 14px rgba(34,197,94,.35); }
.btn-red     { background: var(--red); color: #fff; }
.btn-red:hover { background: #dc2626; }
.btn-ghost   { background: transparent; color: var(--text-p); border: 1.5px solid #e2e8f0; }
.btn-ghost:hover { background: #f1f5f9; }
.btn-sm { padding: 7px 14px; font-size: .8rem; }
.btn-lg { padding: 13px 28px; font-size: .98rem; }
.btn-icon { padding: 9px 12px; }

/* ── Form elements ── */
.form-group { display: flex; flex-direction: column; gap: 6px; margin-bottom: 16px; }
.form-label { font-size: .78rem; font-weight: 700; color: var(--text-p); text-transform: uppercase; letter-spacing: .04em; }
.form-input {
  padding: 11px 14px; border-radius: var(--r-sm);
  border: 1.5px solid #e2e8f0; font-size: .92rem;
  color: var(--text-h); background: #f8fafc;
  outline: none; width: 100%;
  transition: border var(--ease), background var(--ease), box-shadow var(--ease);
}
.form-input:focus { border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(59,130,246,.1); }
.form-input::placeholder { color: var(--text-muted); }

/* ── Flash ── */
.flash {
  display: flex; align-items: center; gap: 10px;
  padding: 12px 16px; border-radius: var(--r-md);
  margin-bottom: 20px; font-weight: 600; font-size: .875rem;
}
.flash-success { background: var(--green-bg); color: var(--green-dark); border: 1px solid #bbf7d0; }
.flash-error   { background: var(--red-bg);   color: #dc2626;           border: 1px solid #fecaca; }
.flash-info    { background: var(--blue-bg);  color: var(--blue-dark);  border: 1px solid #bfdbfe; }

/* ── Badges ── */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  font-size: .66rem; font-weight: 800; padding: 3px 9px;
  border-radius: 999px; text-transform: uppercase; letter-spacing: .05em;
}
.badge-blue  { background: var(--blue-bg);  color: var(--blue-dark); }
.badge-green { background: var(--green-bg); color: var(--green-dark); }
.badge-amber { background: var(--amber-bg); color: #92400e; }
.badge-red   { background: var(--red-bg);   color: #dc2626; }
.badge-gray  { background: #f1f5f9;         color: #64748b; }

/* ── Chart cards ── */
.charts-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
  margin-bottom: 24px;
}
.chart-card {
  background: var(--card); border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm); border: 1px solid var(--card-border);
  overflow: hidden; transition: box-shadow var(--ease);
}
.chart-card:hover { box-shadow: var(--shadow-md); }
.chart-card-hd {
  padding: 14px 18px 12px;
  display: flex; align-items: center; justify-content: space-between;
  border-bottom: 1px solid #f1f5f9;
}
.chart-card-title { font-size: .92rem; font-weight: 700; color: var(--text-h); margin-bottom: 2px; }
.chart-card-device { font-size: .72rem; color: var(--text-muted); font-weight: 500; }
.chart-card-bd { padding: 8px; }

/* ── Download bar ── */
.dl-bar {
  position: fixed; bottom: 0;
  left: var(--sb-w); right: 0;
  background: rgba(255,255,255,.96);
  backdrop-filter: blur(8px);
  border-top: 1px solid #e2e8f0;
  padding: 12px 32px;
  display: none; align-items: center; gap: 12px; justify-content: center;
  z-index: 100; box-shadow: 0 -4px 20px rgba(0,0,0,.06);
}
.dl-bar.visible { display: flex; }

/* ── Section header ── */
.section-hd {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 16px; flex-wrap: wrap; gap: 10px;
}
.section-title {
  font-size: 1.1rem; font-weight: 800; color: var(--text-h);
  display: flex; align-items: center; gap: 8px;
}
.section-count {
  background: #f1f5f9; color: #64748b;
  font-size: .66rem; font-weight: 700;
  padding: 2px 8px; border-radius: 999px;
  text-transform: uppercase; letter-spacing: .05em;
}

/* ── Loading / Empty states ── */
.loading-state {
  text-align: center; padding: 48px 20px; color: var(--text-muted);
}
.loading-spinner {
  width: 36px; height: 36px; margin: 0 auto 16px;
  border: 3px solid #e2e8f0; border-top-color: var(--blue);
  border-radius: 50%; animation: spin .7s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }
.empty-state {
  text-align: center; padding: 52px 20px;
  background: var(--card); border-radius: var(--r-lg);
  border: 2px dashed #e2e8f0; color: var(--text-muted);
}
.empty-icon { font-size: 3rem; margin-bottom: 12px; }

/* ── Quick action row ── */
.quick-row {
  display: flex; gap: 12px; flex-wrap: wrap;
  margin-bottom: 28px;
}
.quick-card {
  flex: 1; min-width: 160px;
  background: var(--card);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--card-border);
  padding: 18px 20px;
  display: flex; align-items: center; gap: 12px;
  text-decoration: none; color: var(--text-h);
  transition: all var(--ease); cursor: pointer;
}
.quick-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.quick-card-icon {
  width: 42px; height: 42px; border-radius: var(--r-md);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.25rem; flex-shrink: 0;
}
.quick-card-label { font-size: .85rem; font-weight: 700; color: var(--text-h); }
.quick-card-sub   { font-size: .72rem; color: var(--text-muted); margin-top: 1px; }

/* ── Mobile sidebar ── */
.mobile-toggle {
  display: none; position: fixed;
  top: 14px; left: 14px; z-index: 1100;
  background: var(--sb-bg); color: #fff; border: none;
  width: 44px; height: 44px; border-radius: var(--r-sm);
  font-size: 1.2rem; cursor: pointer;
  align-items: center; justify-content: center;
  box-shadow: 0 4px 12px rgba(0,0,0,.28);
}
.sb-backdrop {
  display: none; position: fixed; inset: 0;
  background: rgba(0,0,0,.5); z-index: 190;
}
.sb-backdrop.show { display: block; }

/* ── Responsive ── */
@media (max-width: 960px) { .stats-grid { grid-template-columns: repeat(2,1fr); } }
@media (max-width: 768px) {
  .sidebar { left: -260px; transition: left .3s ease; }
  .sidebar.open { left: 0; }
  .main { margin-left: 0; padding: 16px 16px 80px; }
  .mobile-toggle { display: flex; }
  .topbar { padding-top: 58px; }
  .charts-grid { grid-template-columns: 1fr; }
  .dl-bar { left: 0; padding: 10px 16px; }
  .quick-row { gap: 8px; }
  .quick-card { min-width: 140px; padding: 14px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: repeat(2,1fr); }
  .quick-row  { flex-direction: column; }
}

/* ── Auth pages (login / register) ── */
body.auth-body {
  display: flex; align-items: center; justify-content: center;
  min-height: 100vh; padding: 20px;
  background: linear-gradient(135deg,#0f172a 0%,#1a3a6e 50%,#0f172a 100%);
  background-size: 400% 400%;
  animation: authBg 16s ease infinite;
}
@keyframes authBg {
  0%,100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}
.auth-wrap { width: 100%; max-width: 420px; }
.auth-logo {
  text-align: center; margin-bottom: 28px;
}
.auth-logo-icon {
  width: 56px; height: 56px;
  background: linear-gradient(135deg,#3b82f6,#1d4ed8);
  border-radius: 16px;
  display: inline-flex; align-items: center; justify-content: center;
  font-size: 1.6rem; margin-bottom: 12px;
  box-shadow: 0 8px 24px rgba(59,130,246,.45);
}
.auth-logo h1 { color: #fff; font-size: 1.4rem; font-weight: 800; margin: 0 0 4px; }
.auth-logo p  { color: rgba(255,255,255,.55); font-size: .85rem; margin: 0; }
.auth-card {
  background: rgba(255,255,255,.97);
  backdrop-filter: blur(20px);
  border-radius: 20px;
  padding: 36px 32px 28px;
  box-shadow: 0 24px 64px rgba(0,0,0,.4);
  border: 1px solid rgba(255,255,255,.15);
}
.auth-card h2 { font-size: 1.25rem; font-weight: 800; color: var(--text-h); margin-bottom: 4px; }
.auth-card .auth-sub { font-size: .85rem; color: var(--text-muted); margin-bottom: 26px; }
.auth-form-group { margin-bottom: 16px; }
.auth-form-group label {
  display: block; font-size: .78rem; font-weight: 700;
  color: var(--text-p); text-transform: uppercase;
  letter-spacing: .04em; margin-bottom: 6px;
}
.auth-input {
  width: 100%; padding: 12px 14px;
  border-radius: var(--r-sm); border: 1.5px solid #e2e8f0;
  font-size: .95rem; color: var(--text-h); background: #f8fafc;
  outline: none; transition: border var(--ease), box-shadow var(--ease);
  box-sizing: border-box;
}
.auth-input:focus { border-color: var(--blue); background: #fff; box-shadow: 0 0 0 3px rgba(59,130,246,.12); }
.auth-btn {
  width: 100%; padding: 13px;
  background: linear-gradient(135deg,#3b82f6,#1d4ed8);
  color: #fff; border: none; border-radius: var(--r-sm);
  font-size: .98rem; font-weight: 700; cursor: pointer;
  margin-top: 8px; transition: all var(--ease);
  box-shadow: 0 4px 14px rgba(59,130,246,.35);
}
.auth-btn:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(59,130,246,.45); }
.auth-btn:active { transform: translateY(0); }
.auth-links { margin-top: 20px; display: flex; flex-direction: column; gap: 8px; text-align: center; }
.auth-links a { color: var(--blue); text-decoration: none; font-size: .85rem; font-weight: 600; }
.auth-links a:hover { text-decoration: underline; }
.auth-divider { color: var(--text-muted); font-size: .82rem; }
.auth-error {
  background: var(--red-bg); color: #dc2626;
  border: 1px solid #fecaca; border-radius: var(--r-sm);
  padding: 10px 14px; font-size: .85rem; font-weight: 600;
  margin-bottom: 16px; display: flex; align-items: center; gap: 8px;
}

/* ── Utility ── */
.mb-0  { margin-bottom: 0; }
.mb-16 { margin-bottom: 16px; }
.mb-24 { margin-bottom: 24px; }
.mt-auto { margin-top: auto; }
.text-center { text-align: center; }
.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.gap-8  { gap: 8px; }
.gap-12 { gap: 12px; }
.w-full { width: 100%; }