:root {
    /* Color Palette */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-blue: #3b82f6;
    --accent-blue-hover: #2563eb;
    --accent-indigo: #6366f1;
    --danger: #ef4444;
    --warning: #f59e0b;
    --success: #10b981;
    
    /* Glassmorphism */
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
    
    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    
    /* Geometry */
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-pill: 9999px;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}

body {
    background: radial-gradient(circle at top right, #1e1b4b, #0f172a);
    color: var(--text-main);
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* Background Noise overlay for premium feel */
#noise-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    pointer-events: none;
    z-index: 0;
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}

/* Base Glassmatic Component */
.glass-panel {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

/* Views Management */
.screen {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.4s ease, visibility 0.4s;
    z-index: 10;
}

.screen.view-active {
    opacity: 1;
    visibility: visible;
    position: relative;
}

/* =========================================================================
   LOGIN SCREEN
   ========================================================================= */
#login-screen {
    justify-content: center;
    align-items: center;
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: 3rem 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    animation: slideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

.logo-area {
    text-align: center;
}

.logo-area .radar-icon {
    font-size: 3rem;
    color: var(--accent-indigo);
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 0.5rem;
    display: inline-block;
}

.logo-area h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.logo-area p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

#login-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.input-group {
    position: relative;
    display: flex;
    align-items: center;
}

.input-group i {
    position: absolute;
    left: 1rem;
    color: var(--text-muted);
    font-size: 1.2rem;
}

.input-group input {
    width: 100%;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 0.8rem 1rem 0.8rem 3rem;
    color: white;
    font-size: 1rem;
    outline: none;
    transition: var(--transition-fast);
}

.input-group input:focus {
    border-color: var(--accent-indigo);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-blue), var(--accent-indigo));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.btn-primary:active {
    transform: translateY(0);
}

.error-text {
    color: var(--danger);
    font-size: 0.85rem;
    text-align: center;
    min-height: 1.2rem;
}

/* =========================================================================
   DASHBOARD SCREEN
   ========================================================================= */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    margin: 1rem;
    z-index: 20;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.nav-brand h1 {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.5px;
}

.nav-brand .pulse {
    font-size: 1.5rem;
    color: var(--accent-indigo);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.user-badge {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    background: rgba(255,255,255,0.05);
    padding: 0.4rem 1rem;
    border-radius: var(--radius-pill);
    font-size: 0.9rem;
    color: var(--text-muted);
}

.user-badge i {
    color: var(--text-main);
}

.btn-icon {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1.25rem;
    cursor: pointer;
    transition: var(--transition-fast);
    padding: 0.5rem;
    border-radius: var(--radius-md);
}

.btn-icon:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

.dashboard-content {
    flex: 1;
    padding: 0 1rem 2rem 1rem;
    display: flex;
    flex-direction: column;
    gap: 2.5rem;
    max-width: 1600px;
    margin: 0 auto;
    width: 100%;
}

/* Controls */
.controls-panel {
    padding: 1.5rem;
    display: flex;
    flex-wrap: wrap;
    align-items: flex-end;
    gap: 1.5rem;
    justify-content: space-between;
    margin-bottom: 1rem;
}

.date-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

.date-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.date-input-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.date-input-group input[type="datetime-local"] {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    color: var(--text-main);
    padding: 0.6rem 1rem;
    border-radius: var(--radius-md);
    outline: none;
    font-family: inherit;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

/* Chrome/Safari Calendar Icon color fix */
::-webkit-calendar-picker-indicator {
    filter: invert(1);
    opacity: 0.6;
    cursor: pointer;
}

.preset-controls {
    display: flex;
    gap: 0.5rem;
    padding-bottom: 0.2rem;
}

.btn-preset {
    background: rgba(255,255,255,0.05);
    border: 1px solid rgba(255,255,255,0.1);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-pill);
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-preset:hover {
    background: rgba(255,255,255,0.1);
    color: var(--text-main);
}

.btn-preset.active {
    background: rgba(99, 102, 241, 0.2);
    border-color: var(--accent-indigo);
    color: var(--accent-indigo);
}

.action-controls {
    display: flex;
    gap: 1rem;
    margin-left: auto;
}

.btn-secondary {
    background: rgba(255,255,255,0.05);
    color: var(--text-main);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-fast);
}

.btn-secondary:not(:disabled):hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.2);
}

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

/* Stats */
.stats-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 1rem;
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

.stat-icon {
    width: 50px;
    height: 50px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-icon.warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--warning);
}

.stat-icon.info {
    background: rgba(59, 130, 246, 0.1);
    color: var(--accent-blue);
}

.stat-icon.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.stat-info h3 {
    font-size: 0.9rem;
    color: var(--text-muted);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.stat-info p {
    font-size: 1.8rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
}

/* Table */
.table-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
    min-height: 400px;
}

.table-header {
    padding: 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--glass-border);
}

.table-header h2 {
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-group {
    position: relative;
    width: 100%;
    max-width: 300px;
}

.filter-group i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
}

.filter-group input {
    width: 100%;
    background: rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.05);
    border-radius: var(--radius-pill);
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    color: white;
    font-size: 0.9rem;
    outline: none;
    transition: var(--transition-fast);
}

.filter-group input:focus {
    border-color: var(--accent-blue);
    background: rgba(0,0,0,0.4);
}

.table-wrapper {
    overflow-x: auto;
    overflow-y: auto;
    flex: 1;
}

table {
    width: max-content;
    min-width: 100%;
    border-collapse: collapse;
    text-align: left;
    white-space: nowrap;
    table-layout: fixed;
}

th {
    position: sticky;
    top: 0;
    background: rgba(30, 41, 59, 0.95);
    backdrop-filter: blur(8px);
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-bottom: 1px solid var(--glass-border);
    z-index: 2;
    /* 마우스로 열 폭 조정 가능 */
    resize: horizontal;
    overflow: hidden;
    min-width: 40px;
    box-sizing: border-box;
}

td {
    padding: 1rem;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(255,255,255,0.03);
    transition: background var(--transition-fast);
}

tbody tr:hover td {
    background: rgba(255,255,255,0.03);
}

/* ── 열 너비 클래스 (고정 너비 + 마우스 리사이즈 지원) ── */
.col-no      { width: 48px;  min-width: 40px;  }
.col-zone    { width: 160px; min-width: 100px; }
.col-customer{ width: 320px; min-width: 160px; }  /* 40자 기준 표시 */
.col-contact { width: 90px;  min-width: 60px;  }
.col-device  { width: 160px; min-width: 100px; }
.col-sensor  { width: 220px; min-width: 120px; }
.col-count   { width: 60px;  min-width: 50px;  }
.col-dt      { width: 170px; min-width: 140px; }
.col-msg     { width: 280px; min-width: 100px; }

th.number, td.number { text-align: right; font-variant-numeric: tabular-nums; }

td.highlight {
    color: var(--danger);
    font-weight: 600;
}

.empty-row td {
    text-align: center;
    padding: 3rem;
    color: var(--text-muted);
    font-style: italic;
}

/* Error Capture Column Styling */
.td-message {
    max-width: 300px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: help;
}

.td-message:hover {
    color: var(--text-main);
}

/* Loading Overlay */
#loading-overlay {
    position: absolute;
    top: 73px; /* below header */
    left: 0;
    width: 100%;
    height: calc(100% - 73px);
    background: rgba(15, 23, 42, 0.8);
    backdrop-filter: blur(4px);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 1rem;
    z-index: 5;
    transition: opacity var(--transition-base), visibility var(--transition-base);
}

#loading-overlay.hidden {
    opacity: 0;
    visibility: hidden;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 3px solid rgba(99, 102, 241, 0.2);
    border-top-color: var(--accent-indigo);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive constraints */
@media (max-width: 1024px) {
    .action-controls {
        margin-left: 0;
        width: 100%;
    }
    .action-controls button {
        flex: 1;
}

/* ── Tabs ── */

.view-content {
    display: none;
    animation: slideUp 0.4s ease;
}

.view-content.active {
    display: block;
}