/* ── Variables ─────────────────────────────────────── */
:root {
    --bg:           #050711;
    --bg-elevated:  #0b0f1f;
    --bg-soft:      #111729;
    --accent:       #3b82f6;
    --accent-glow:  rgba(59, 130, 246, 0.4);
    --text:         #e5e7eb;
    --text-soft:    #9ca3af;
    --success:      #22c55e;
    --success-glow: rgba(34, 197, 94, 0.8);
    --danger:       #f97373;
    --danger-glow:  rgba(249, 115, 115, 0.8);
    --warning:      #f59e0b;
    --border:       rgba(148, 163, 184, 0.2);
    --radius:       14px;
    --shadow:       0 18px 45px rgba(15, 23, 42, 0.9);
}

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

html, body {
    height: 100%;
    background: radial-gradient(circle at top, #111827 0, #020617 55%);
    color: var(--text);
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ── App Shell ─────────────────────────────────────── */
.app-shell {
    display: grid;
    grid-template-columns: 240px minmax(0, 1fr);
    min-height: 100vh;
}

/* ── Sidebar ───────────────────────────────────────── */
.sidebar {
    background: radial-gradient(circle at top left, #111827 0, #020617 60%);
    border-right: 1px solid var(--border);
    padding: 20px 16px;
    display: flex;
    flex-direction: column;
    gap: 20px;
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
}

.brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding-bottom: 18px;
    border-bottom: 1px solid var(--border);
}

.brand-logo {
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: radial-gradient(circle at 30% 0, #60a5fa, #1d4ed8 60%, #020617);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 18px;
    color: white;
    box-shadow: 0 0 18px rgba(59, 130, 246, 0.7);
    flex-shrink: 0;
}

.brand-title {
    font-size: 15px;
    font-weight: 700;
    letter-spacing: 0.05em;
}

.brand-subtitle {
    font-size: 11px;
    color: var(--text-soft);
}

.nav { display: flex; flex-direction: column; gap: 4px; }

.nav-section {
    font-size: 10px;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-soft);
    margin: 10px 4px 4px;
}

.nav-item {
    width: 100%;
    text-align: left;
    padding: 8px 10px;
    border-radius: 8px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-soft);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}

.nav-item:hover { background: rgba(15,23,42,0.9); border-color: var(--border); color: var(--text); }

.nav-item.active {
    background: radial-gradient(circle at top left, #1d4ed8, #020617 70%);
    border-color: rgba(59, 130, 246, 0.7);
    color: white;
    box-shadow: 0 0 14px rgba(37, 99, 235, 0.5);
}

.user-block {
    margin-top: auto;
    padding-top: 14px;
    border-top: 1px solid var(--border);
    font-size: 12px;
}

.user-name  { font-weight: 600; margin-bottom: 2px; }
.user-email { color: var(--text-soft); font-size: 11px; margin-bottom: 10px; }

.logout-btn {
    width: 100%;
    padding: 7px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--danger);
    font-size: 12px;
    cursor: pointer;
    transition: all 0.15s;
}
.logout-btn:hover { background: rgba(249,115,115,0.1); border-color: var(--danger); }

/* ── Main ──────────────────────────────────────────── */
.main {
    padding: 24px 28px;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.main-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.main-header h1 { font-size: 22px; font-weight: 700; }
.subtitle { margin-top: 4px; font-size: 13px; color: var(--text-soft); }

.btn-add {
    padding: 9px 18px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
    box-shadow: 0 0 16px var(--accent-glow);
}
.btn-add:hover { background: #2563eb; box-shadow: 0 0 24px var(--accent-glow); }

/* ── Device Grid ───────────────────────────────────── */
.device-grid {
    display: grid;
    gap: 16px;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.loading-state {
    grid-column: 1/-1;
    text-align: center;
    padding: 60px 20px;
    color: var(--text-soft);
    font-size: 14px;
}

/* ── Device Card ───────────────────────────────────── */
.device-card {
    background: radial-gradient(circle at top, #111827 0, #020617 70%);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    flex-direction: column;
    gap: 12px;
    box-shadow: var(--shadow);
}

.device-card:hover {
    border-color: var(--accent);
    box-shadow: 0 0 24px var(--accent-glow);
    transform: translateY(-2px);
}

.device-card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
}

.device-card-photo {
    width: 48px;
    height: 48px;
    border-radius: 10px;
    background: radial-gradient(circle at 30% 0, #60a5fa, #1d4ed8 60%, #020617);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    font-weight: 700;
    color: white;
    box-shadow: 0 0 14px rgba(59, 130, 246, 0.5);
    flex-shrink: 0;
    overflow: hidden;
}

.device-card-photo img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
}

.device-card-info { flex: 1; min-width: 0; }

.device-card-name {
    font-size: 15px;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.device-card-mac {
    font-size: 11px;
    color: var(--text-soft);
    font-family: monospace;
    margin-top: 2px;
}

.status-pill {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 4px 10px;
    border-radius: 999px;
    font-size: 11px;
    font-weight: 600;
    border: 1px solid rgba(148,163,184,0.3);
    white-space: nowrap;
}

.status-dot {
    width: 7px;
    height: 7px;
    border-radius: 50%;
}

.status-pill.online  { background: rgba(34,197,94,0.1);  border-color: rgba(34,197,94,0.4); }
.status-pill.offline { background: rgba(249,115,115,0.1); border-color: rgba(249,115,115,0.4); }
.status-pill.unknown { background: rgba(156,163,175,0.1); border-color: rgba(156,163,175,0.4); }

.status-pill.online  .status-dot { background: var(--success); box-shadow: 0 0 8px var(--success-glow); }
.status-pill.offline .status-dot { background: var(--danger);  box-shadow: 0 0 8px var(--danger-glow); }
.status-pill.unknown .status-dot { background: var(--text-soft); }

/* ── Sensor Grid ───────────────────────────────────── */
.sensor-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.sensor-item {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 8px 10px;
}

.sensor-label {
    font-size: 10px;
    color: var(--text-soft);
    text-transform: uppercase;
    letter-spacing: 0.06em;
    margin-bottom: 3px;
}

.sensor-value {
    font-size: 16px;
    font-weight: 600;
    color: var(--text);
}

.sensor-value.voltage { color: #facc15; }
.sensor-value.temp    { color: #f97316; }
.sensor-value.signal  { color: var(--accent); }
.sensor-value.uptime  { color: var(--success); }

/* Signal bar */
.signal-bar-wrap {
    margin-top: 4px;
    height: 4px;
    border-radius: 999px;
    background: rgba(15,23,42,0.9);
    overflow: hidden;
}

.signal-bar {
    height: 100%;
    border-radius: inherit;
    background: linear-gradient(90deg, #f97316, #facc15, #22c55e);
    transition: width 0.4s ease;
}

/* ── Last seen ─────────────────────────────────────── */
.device-card-footer {
    font-size: 11px;
    color: var(--text-soft);
    border-top: 1px solid var(--border);
    padding-top: 10px;
}

/* ── Modal ─────────────────────────────────────────── */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.6);
    display: none;
    align-items: center;
    justify-content: center;
    z-index: 200;
    padding: 20px;
}

.modal-overlay.open { display: flex; }

.modal {
    background: radial-gradient(circle at top, #111827 0, #020617 70%);
    border: 1px solid rgba(59,130,246,0.4);
    border-radius: 16px;
    padding: 24px;
    width: 100%;
    max-width: 440px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 0 60px rgba(59,130,246,0.2);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 { font-size: 18px; font-weight: 700; }

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-soft);
    font-size: 18px;
    cursor: pointer;
    padding: 4px 8px;
    border-radius: 6px;
    transition: all 0.15s;
}
.modal-close:hover { color: var(--text); background: rgba(148,163,184,0.1); }

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--text);
}

.optional { font-weight: 400; color: var(--text-soft); }

.form-group input[type="text"],
.form-group input[type="url"],
.form-group input[type="file"] {
    padding: 9px 12px;
    background: rgba(15,23,42,0.8);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 13px;
    outline: none;
    transition: border-color 0.2s;
}

.form-group input:focus { border-color: var(--accent); }

.form-hint { font-size: 11px; color: var(--text-soft); }

/* Photo tabs */
.photo-options {
    display: flex;
    gap: 8px;
    margin-bottom: 6px;
}

.photo-tab {
    padding: 5px 14px;
    border-radius: 6px;
    font-size: 12px;
    font-weight: 600;
    cursor: pointer;
    border: 1px solid var(--border);
    color: var(--text-soft);
    transition: all 0.15s;
}

.photo-tab.active {
    background: var(--accent);
    border-color: var(--accent);
    color: white;
}

.upload-hint {
    padding: 20px;
    text-align: center;
    border: 1px dashed var(--border);
    border-radius: 8px;
    font-size: 13px;
    color: var(--text-soft);
    margin-top: 6px;
}

#photo-preview {
    width: 100%;
    max-height: 160px;
    object-fit: cover;
    border-radius: 8px;
    margin-top: 8px;
    border: 1px solid var(--border);
}

.modal-error {
    color: var(--danger);
    font-size: 13px;
    display: none;
}

.modal-error.visible { display: block; }

.modal-footer {
    display: flex;
    gap: 10px;
    justify-content: flex-end;
    padding-top: 4px;
    border-top: 1px solid var(--border);
}

.btn-cancel {
    padding: 9px 18px;
    background: transparent;
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text-soft);
    font-size: 13px;
    cursor: pointer;
    transition: all 0.15s;
}
.btn-cancel:hover { border-color: var(--text-soft); color: var(--text); }

.btn-submit {
    padding: 9px 20px;
    background: var(--accent);
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 13px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.15s;
}
.btn-submit:hover { background: #2563eb; }
.btn-submit:disabled { opacity: 0.6; cursor: not-allowed; }

/* ── Responsive ────────────────────────────────────── */
@media (max-width: 768px) {
    .app-shell {
        grid-template-columns: 1fr;
    }

    .sidebar {
        position: static;
        height: auto;
        flex-direction: row;
        flex-wrap: wrap;
        padding: 12px 16px;
        gap: 12px;
    }

    .nav { flex-direction: row; flex-wrap: wrap; }
    .nav-section { display: none; }
    .nav-item { width: auto; }
    .user-block { margin-top: 0; padding-top: 0; border-top: none; border-left: 1px solid var(--border); padding-left: 12px; }

    .main { padding: 16px; }
    .main-header { flex-direction: column; align-items: flex-start; gap: 12px; }

    .device-grid { grid-template-columns: 1fr; }
}

/* ── Bottom Nav (mobile PWA) ───────────────────────── */
:root {
    --safe-bot: env(safe-area-inset-bottom, 0px);
    --safe-top: env(safe-area-inset-top, 0px);
}

body {
    padding-bottom: calc(64px + var(--safe-bot));
    padding-top: var(--safe-top);
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: calc(64px + var(--safe-bot));
    padding-bottom: var(--safe-bot);
    background: rgba(11,15,31,0.97);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-top: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-around;
    z-index: 100;
}

.nav-tab {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    padding: 8px 0;
    background: none;
    border: none;
    color: var(--text-soft);
    font-size: 10px;
    cursor: pointer;
    transition: color 0.15s;
    font-family: inherit;
}

.nav-tab.active { color: var(--accent); }
.nav-tab-icon   { font-size: 22px; line-height: 1; }

/* Hide bottom nav on desktop */
@media (min-width: 769px) {
    .bottom-nav { display: none; }
    body { padding-bottom: 0; padding-top: 0; }
}

/* ── Device card hero photo ────────────────────────── */
.device-card-hero {
    width: calc(100% + 32px);
    margin: -16px -16px 12px -16px;
    height: 160px;
    border-radius: 14px 14px 0 0;
    overflow: hidden;
    position: relative;
    cursor: zoom-in;
}

.device-card-hero img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.3s ease;
}

.device-card-hero:hover img { transform: scale(1.04); }

.device-card-hero-hint {
    position: absolute;
    bottom: 8px;
    right: 10px;
    font-size: 16px;
    opacity: 0.7;
    background: rgba(0,0,0,0.4);
    border-radius: 6px;
    padding: 2px 6px;
}