/* ============================================
   AU Power System - 全站樣式
   DPM-C530A 電力監控系統
   Dark Industrial / Power Grid Theme
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    --bg-body: #080c14;
    --bg-page: #0b1120;
    --bg-card: rgba(13, 20, 38, 0.75);
    --bg-card-solid: #0d1426;
    --bg-input: rgba(15, 23, 42, 0.6);
    --bg-hover: rgba(22, 33, 62, 0.5);

    --border: rgba(34, 211, 238, 0.12);
    --border-hover: rgba(34, 211, 238, 0.35);
    --border-active: rgba(34, 211, 238, 0.6);

    --cyan: #22d3ee;
    --cyan-dim: rgba(34, 211, 238, 0.10);
    --cyan-glow: rgba(34, 211, 238, 0.25);
    --cyan-grad: linear-gradient(135deg, #06b6d4, #22d3ee, #67e8f9);

    --green: #10b981;
    --red: #ef4444;
    --amber: #f59e0b;
    --purple: #8b5cf6;

    --text: #e2e8f0;
    --text-sec: #8892a6;
    --text-dim: #4b5563;

    --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --mono: 'JetBrains Mono', 'Consolas', monospace;

    --r-sm: 8px;
    --r-md: 12px;
    --r-lg: 16px;
    --r-xl: 20px;

    --shadow: 0 4px 24px rgba(0,0,0,0.4);
    --glow: 0 0 30px rgba(34,211,238,0.08);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* === Reset === */
*,*::before,*::after { margin:0; padding:0; box-sizing:border-box; }
html { font-size:16px; scroll-behavior:smooth; }

body {
    font-family: var(--font);
    background: var(--bg-body);
    color: var(--text);
    min-height: 100vh;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

/* === Animated Grid Background === */
.bg-grid {
    position: fixed; inset: 0;
    z-index: 0; pointer-events: none;
    background:
        linear-gradient(rgba(34,211,238,0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(34,211,238,0.03) 1px, transparent 1px);
    background-size: 60px 60px;
}
.bg-grid::before {
    content:''; position:absolute; inset:0;
    background:
        radial-gradient(ellipse 50% 50% at 20% 50%, rgba(34,211,238,0.06), transparent 70%),
        radial-gradient(ellipse 40% 40% at 80% 70%, rgba(6,182,212,0.05), transparent 70%);
}
.bg-grid::after {
    content:''; position:absolute; top:0; left:0; right:0; height:1px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    opacity:0.15;
    animation: scanDown 8s linear infinite;
}
@keyframes scanDown {
    0%{top:-1px} 100%{top:100%}
}

/* ======================
   LOGIN PAGE
   ====================== */
.login-wrapper {
    display:flex; align-items:center; justify-content:center;
    min-height:100vh; position:relative; z-index:1; padding:20px;
}

/* Floating electric nodes */
.login-wrapper::before {
    content:''; position:absolute; inset:0;
    background:
        radial-gradient(2px 2px at 15% 25%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 75% 15%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 85% 65%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 25% 80%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 55% 45%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 40% 10%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 90% 90%, var(--cyan) 50%, transparent 50%),
        radial-gradient(2px 2px at 10% 60%, var(--cyan) 50%, transparent 50%);
    opacity:0.3;
    animation: twinkle 4s ease-in-out infinite alternate;
}
@keyframes twinkle { 0%{opacity:0.2} 100%{opacity:0.5} }

.login-card {
    background: var(--bg-card);
    backdrop-filter: blur(24px) saturate(1.2);
    border: 1px solid var(--border);
    border-radius: var(--r-xl);
    padding: 48px 44px;
    width: 100%; max-width: 420px;
    box-shadow: var(--shadow), var(--glow);
    animation: fadeUp 0.7s ease-out;
    position: relative;
}
.login-card::before {
    content:''; position:absolute; top:0; left:20%; right:20%; height:1px;
    background: linear-gradient(90deg, transparent, var(--cyan), transparent);
    opacity:0.5;
}

@keyframes fadeUp {
    from { opacity:0; transform:translateY(30px); }
    to { opacity:1; transform:translateY(0); }
}

.login-logo {
    width:80px; height:80px; margin:0 auto 24px;
    display:flex; align-items:center; justify-content:center;
    position:relative;
}
.login-logo svg { width:72px; height:72px; filter: drop-shadow(0 0 12px rgba(34,211,238,0.4)); }

.login-title {
    font-size:1.5rem; font-weight:700; text-align:center;
    margin-bottom:4px; color: var(--text);
}
.login-title span { color: var(--cyan); }

.login-subtitle {
    text-align:center; color:var(--text-sec); font-size:0.9rem;
    margin-bottom:32px; letter-spacing:0.5px;
}

.form-group { margin-bottom:18px; }
.form-group label {
    display:block; font-size:0.75rem; font-weight:600; color:var(--text-sec);
    margin-bottom:6px; text-transform:uppercase; letter-spacing:0.8px;
}

.input-wrapper { position:relative; }
.input-wrapper .input-icon {
    position:absolute; left:16px; top:50%; transform:translateY(-50%);
    color:var(--text-dim); pointer-events:none; transition:var(--transition);
    display:flex; align-items:center;
}
.input-wrapper .input-icon svg { width:18px; height:18px; stroke:currentColor; fill:none; stroke-width:1.5; }

.form-input {
    width:100%; padding:14px 16px 14px 48px;
    background:var(--bg-input); border:1px solid var(--border);
    border-radius:var(--r-md); color:var(--text);
    font-family:var(--font); font-size:0.95rem;
    transition:var(--transition); outline:none;
}
.form-input:focus {
    border-color:var(--cyan);
    box-shadow:0 0 0 3px var(--cyan-dim), 0 0 16px rgba(34,211,238,0.08);
}
.form-input:focus ~ .input-icon { color:var(--cyan); }
.form-input::placeholder { color:var(--text-dim); }

.btn { display:inline-flex; align-items:center; justify-content:center; gap:8px;
    padding:14px 28px; border:none; border-radius:var(--r-md);
    font-family:var(--font); font-size:0.95rem; font-weight:600;
    cursor:pointer; transition:var(--transition); text-decoration:none; }

.btn-primary {
    width:100%; background:var(--cyan-grad); color:#0b1120;
    padding:15px; font-size:1rem; margin-top:8px;
    box-shadow:0 4px 16px rgba(34,211,238,0.25);
    position:relative; overflow:hidden;
}
.btn-primary::after {
    content:''; position:absolute; top:0; left:-100%; width:100%; height:100%;
    background:linear-gradient(90deg,transparent,rgba(255,255,255,0.25),transparent);
    transition:0.5s;
}
.btn-primary:hover::after { left:100%; }
.btn-primary:hover { transform:translateY(-2px); box-shadow:0 8px 28px rgba(34,211,238,0.35); }
.btn-primary:active { transform:translateY(0); }
.btn-primary:disabled { opacity:0.5; cursor:not-allowed; transform:none; }

.login-error {
    background:rgba(239,68,68,0.08); border:1px solid rgba(239,68,68,0.25);
    border-radius:var(--r-sm); color:var(--red);
    padding:10px 14px; font-size:0.85rem; margin-bottom:14px;
    display:none; animation:shake 0.4s ease;
}
@keyframes shake {
    0%,100%{transform:translateX(0)} 25%{transform:translateX(-6px)} 75%{transform:translateX(6px)}
}

.login-links {
    display:flex; justify-content:center; gap:24px;
    margin-top:24px; font-size:0.8rem;
}
.login-links a {
    color:var(--text-dim); text-decoration:none; transition:var(--transition);
}
.login-links a:hover { color:var(--cyan); }

.login-footer {
    text-align:center; margin-top:20px; color:var(--text-dim);
    font-size:0.7rem; letter-spacing:0.5px;
}

.spinner {
    display:inline-block; width:18px; height:18px;
    border:2px solid rgba(11,17,32,0.3); border-top-color:#0b1120;
    border-radius:50%; animation:spin 0.6s linear infinite;
}
@keyframes spin { to{transform:rotate(360deg)} }

/* ======================
   NAVIGATION
   ====================== */
.navbar {
    background:rgba(8,12,20,0.92); backdrop-filter:blur(16px);
    border-bottom:1px solid var(--border);
    padding:0 28px; height:60px;
    display:flex; align-items:center; justify-content:space-between;
    position:sticky; top:0; z-index:100;
}
.navbar::after {
    content:''; position:absolute; bottom:-1px; left:0; right:0; height:1px;
    background:linear-gradient(90deg,transparent,rgba(34,211,238,0.3),transparent);
}

.nav-brand { display:flex; align-items:center; gap:10px; }
.nav-brand-icon {
    width:34px; height:34px;
    display:flex; align-items:center; justify-content:center;
}
.nav-brand-icon svg {
    width:28px; height:28px;
    filter:drop-shadow(0 0 6px rgba(34,211,238,0.4));
}
.nav-brand-text {
    font-size:0.95rem; font-weight:700; color:var(--text);
    letter-spacing:0.5px;
}
.nav-brand-text span { color:var(--cyan); }

.nav-links { display:flex; align-items:center; gap:2px; }
.nav-link {
    padding:8px 18px; border-radius:var(--r-sm);
    color:var(--text-sec); text-decoration:none;
    font-size:0.85rem; font-weight:500;
    transition:var(--transition); position:relative;
}
.nav-link:hover { color:var(--text); }
.nav-link.active { color:var(--text); font-weight:600; }
.nav-link.active::after {
    content:''; position:absolute; bottom:0; left:25%; right:25%; height:2px;
    background:var(--cyan); border-radius:1px;
    box-shadow:0 0 8px var(--cyan-glow);
}

.nav-right { display:flex; align-items:center; gap:16px; }
.nav-user {
    display:flex; align-items:center; gap:8px;
    color:var(--text-sec); font-size:0.85rem;
}
.nav-user-avatar {
    width:32px; height:32px; background:var(--cyan-dim);
    border:1px solid var(--border); border-radius:50%;
    display:flex; align-items:center; justify-content:center; font-size:14px;
}
.nav-status-dot {
    width:8px; height:8px; border-radius:50%;
    background:var(--green);
    box-shadow:0 0 6px rgba(16,185,129,0.5);
}

.btn-logout {
    padding:6px 16px;
    background:transparent; border:1px solid var(--border);
    border-radius:var(--r-sm); color:var(--text-sec);
    font-size:0.8rem; font-weight:500; cursor:pointer;
    transition:var(--transition); font-family:var(--font);
}
.btn-logout:hover { border-color:var(--border-hover); color:var(--text); }

/* ======================
   MAIN CONTENT
   ====================== */
.main-content {
    padding:24px 28px; max-width:1440px;
    margin:0 auto; position:relative; z-index:1;
}

/* Title bar */
.page-header {
    display:flex; align-items:baseline; justify-content:space-between;
    margin-bottom:24px; flex-wrap:wrap; gap:8px;
}
.page-title-group { display:flex; align-items:baseline; gap:16px; }
.page-title {
    font-size:1.1rem; font-weight:800; text-transform:uppercase;
    letter-spacing:1.5px; color:var(--text);
}
.page-divider {
    width:1px; height:18px; background:var(--text-dim);
    display:inline-block; vertical-align:middle; margin:0 4px;
}
.page-subtitle {
    font-size:0.9rem; color:var(--text-sec); font-weight:400;
}
.page-datetime {
    font-size:0.85rem; color:var(--text-sec);
    font-family:var(--mono); white-space:nowrap;
}

/* Status bar */
.status-bar {
    display:flex; align-items:center; gap:12px;
    margin-bottom:20px; padding:10px 18px;
    background:var(--bg-card); border:1px solid var(--border);
    border-radius:var(--r-md); font-size:0.8rem;
}
.status-dot {
    width:8px; height:8px; border-radius:50%; background:var(--green);
    box-shadow:0 0 8px rgba(16,185,129,0.4);
    animation:pulse 2s ease-in-out infinite;
}
.status-dot.offline { background:var(--red); box-shadow:0 0 8px rgba(239,68,68,0.4); animation:none; }
@keyframes pulse {
    0%,100%{box-shadow:0 0 6px rgba(16,185,129,0.3)} 50%{box-shadow:0 0 14px rgba(16,185,129,0.6)}
}
.status-text { color:var(--text-sec); }
.status-time { margin-left:auto; color:var(--text-dim); font-family:var(--mono); font-size:0.78rem; }

/* ======================
   METRIC CARDS
   ====================== */
.metrics-grid {
    display:grid; grid-template-columns:repeat(5,1fr);
    gap:14px; margin-bottom:24px;
}

.metric-card {
    background:var(--bg-card); border:1px solid var(--border);
    border-radius:var(--r-lg); padding:18px 20px;
    transition:var(--transition); position:relative; overflow:hidden;
}
.metric-card::before {
    content:''; position:absolute; top:0; left:0; right:0; height:2px;
    background:var(--cyan-grad); opacity:0;
    transition:var(--transition);
}
.metric-card:hover {
    border-color:var(--border-hover);
    transform:translateY(-3px);
    box-shadow:0 8px 30px rgba(0,0,0,0.3), 0 0 20px rgba(34,211,238,0.05);
}
.metric-card:hover::before { opacity:1; }

.metric-header {
    display:flex; align-items:center; gap:10px; margin-bottom:10px;
}
.metric-icon {
    width:36px; height:36px;
    background:var(--cyan-dim); border:1px solid var(--border);
    border-radius:var(--r-sm);
    display:flex; align-items:center; justify-content:center;
}
.metric-icon svg { width:18px; height:18px; stroke:var(--cyan); fill:none; stroke-width:1.5; }

.metric-label {
    font-size:0.78rem; font-weight:600; color:var(--text-sec);
    letter-spacing:0.3px;
}

.metric-value-row { display:flex; align-items:baseline; gap:6px; margin-bottom:6px; }
.metric-value {
    font-size:1.9rem; font-weight:800; font-family:var(--mono);
    color:var(--text); line-height:1;
}
.metric-unit {
    font-size:0.85rem; color:var(--text-sec); font-weight:500;
}

.metric-trend {
    display:flex; align-items:center; gap:5px;
    font-size:0.72rem; color:var(--text-dim);
}
.metric-trend .trend-label { font-weight:500; }
.metric-trend .trend-val { font-family:var(--mono); font-weight:600; }
.metric-trend .trend-up { color:var(--green); }
.metric-trend .trend-down { color:var(--red); }
.metric-trend .trend-stable { color:var(--amber); }
.metric-trend .trend-arrow { font-size:0.65rem; }

/* ======================
   CHARTS
   ====================== */
.charts-row {
    display:grid; gap:16px; margin-bottom:24px;
}
.charts-row-2 { grid-template-columns:1.6fr 1fr; }
.charts-row-equal { grid-template-columns:1fr 1fr; }

.chart-card {
    background:var(--bg-card); border:1px solid var(--border);
    border-radius:var(--r-lg); padding:20px 22px;
    transition:var(--transition); position:relative;
}
.chart-card:hover { border-color:var(--border-hover); }

.chart-header {
    display:flex; align-items:center; justify-content:space-between;
    margin-bottom:16px;
}
.chart-title {
    font-size:0.9rem; font-weight:700; color:var(--text);
    letter-spacing:0.3px;
}
.chart-badge {
    padding:4px 12px; background:var(--bg-input); border:1px solid var(--border);
    border-radius:var(--r-sm); font-size:0.72rem; color:var(--text-sec);
    cursor:default;
}

.chart-container { position:relative; height:280px; }

/* ======================
   ANALYSIS TOOLBAR
   ====================== */
.toolbar {
    display:flex; align-items:center; gap:14px;
    margin-bottom:24px; padding:14px 20px;
    background:var(--bg-card); border:1px solid var(--border);
    border-radius:var(--r-md); flex-wrap:wrap;
}
.toolbar-label {
    font-size:0.78rem; color:var(--text-sec); font-weight:600;
    text-transform:uppercase; letter-spacing:0.8px;
}
.toolbar-range-text {
    font-family:var(--mono); font-size:0.82rem; color:var(--text);
}

.btn-group { display:flex; gap:4px; }
.btn-range {
    padding:7px 16px; background:transparent;
    border:1px solid var(--border); border-radius:var(--r-sm);
    color:var(--text-sec); font-size:0.78rem; font-weight:500;
    cursor:pointer; transition:var(--transition); font-family:var(--font);
}
.btn-range:hover { border-color:var(--border-hover); color:var(--text); }
.btn-range.active {
    background:rgba(34,211,238,0.1); border-color:var(--cyan);
    color:var(--cyan); font-weight:600;
}

/* ======================
   STATISTICS TABLE
   ====================== */
.stats-table-wrapper { overflow-x:auto; }
.stats-table {
    width:100%; border-collapse:separate; border-spacing:0;
    font-size:0.85rem;
}
.stats-table thead th {
    background:rgba(34,211,238,0.04); color:var(--text-sec);
    font-weight:600; font-size:0.75rem; text-transform:uppercase;
    letter-spacing:0.8px; padding:12px 16px; text-align:left;
    border-bottom:1px solid var(--border);
}
.stats-table thead th:first-child { border-radius:var(--r-sm) 0 0 0; }
.stats-table thead th:last-child { border-radius:0 var(--r-sm) 0 0; }

.stats-table tbody td {
    padding:12px 16px; border-bottom:1px solid rgba(34,211,238,0.05);
    color:var(--text);
}
.stats-table tbody tr:hover td { background:rgba(34,211,238,0.03); }
.stats-table tbody td:first-child { color:var(--text-sec); font-weight:500; }

.stats-value { font-family:var(--mono); font-weight:500; }

/* PF Gauge */
.pf-gauge-wrap {
    display:flex; flex-direction:column;
    align-items:center; justify-content:center;
    padding:20px;
}
.pf-gauge-container { position:relative; width:200px; height:140px; }
.pf-gauge-center {
    position:absolute; top:55%; left:50%; transform:translate(-50%,-50%);
    text-align:center;
}
.pf-gauge-label { font-size:0.7rem; color:var(--cyan); font-weight:600; text-transform:uppercase; letter-spacing:1px; }
.pf-gauge-value { font-size:2rem; font-weight:800; font-family:var(--mono); color:var(--text); }
.pf-gauge-desc { font-size:0.65rem; color:var(--text-dim); margin-top:2px; }
.pf-gauge-footer { font-size:0.7rem; color:var(--text-dim); margin-top:8px; text-transform:uppercase; letter-spacing:1px; }

/* ======================
   UTILITY
   ====================== */
.loading-overlay {
    position:fixed; inset:0; background:rgba(8,12,20,0.85);
    backdrop-filter:blur(4px); display:flex; align-items:center;
    justify-content:center; z-index:1000; opacity:0;
    pointer-events:none; transition:var(--transition);
}
.loading-overlay.active { opacity:1; pointer-events:auto; }
.loading-spinner {
    width:44px; height:44px; border:2px solid rgba(34,211,238,0.15);
    border-top-color:var(--cyan); border-radius:50%;
    animation:spin 0.8s linear infinite;
}

.no-data { text-align:center; padding:50px 20px; color:var(--text-dim); }

/* Scrollbar */
::-webkit-scrollbar { width:5px; height:5px; }
::-webkit-scrollbar-track { background:var(--bg-body); }
::-webkit-scrollbar-thumb { background:rgba(34,211,238,0.15); border-radius:3px; }
::-webkit-scrollbar-thumb:hover { background:rgba(34,211,238,0.3); }

::selection { background:rgba(34,211,238,0.25); color:var(--text); }

/* ======================
   RESPONSIVE
   ====================== */
@media (max-width:1200px) {
    .metrics-grid { grid-template-columns:repeat(3,1fr); }
}
@media (max-width:768px) {
    .main-content { padding:16px; }
    .metrics-grid { grid-template-columns:repeat(2,1fr); }
    .charts-row-2, .charts-row-equal { grid-template-columns:1fr; }
    .navbar { padding:0 14px; }
    .nav-link { padding:8px 12px; font-size:0.8rem; }
    .nav-user span { display:none; }
    .toolbar { flex-direction:column; align-items:flex-start; }
    .login-card { margin:16px; padding:36px 28px; }
    .metric-value { font-size:1.5rem; }
    .page-header { flex-direction:column; }
    .page-datetime { display:none; }
}
@media (max-width:480px) {
    .metrics-grid { grid-template-columns:1fr; }
}

/* ======================
   IDLE TIMEOUT MODAL
   ====================== */
.idle-modal-overlay {
    position: fixed; inset: 0;
    background: rgba(8, 12, 20, 0.88);
    backdrop-filter: blur(8px);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    animation: fadeIn 0.3s ease;
}
.idle-modal-overlay.active {
    display: flex;
}

.idle-modal {
    background: var(--bg-card-solid);
    border: 1px solid rgba(239, 68, 68, 0.4);
    border-radius: var(--r-xl);
    padding: 40px 44px;
    max-width: 420px;
    width: 90%;
    text-align: center;
    box-shadow: 0 0 60px rgba(239, 68, 68, 0.15), var(--shadow);
    animation: fadeUp 0.4s ease-out;
}

.idle-modal-icon {
    width: 64px; height: 64px;
    margin: 0 auto 20px;
    background: rgba(239, 68, 68, 0.1);
    border: 2px solid rgba(239, 68, 68, 0.3);
    border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 28px;
    animation: pulseWarn 1.5s ease-in-out infinite;
}
@keyframes pulseWarn {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.3); }
    50% { box-shadow: 0 0 0 12px rgba(239, 68, 68, 0); }
}

.idle-modal-title {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--red);
    margin-bottom: 8px;
}

.idle-modal-text {
    font-size: 0.9rem;
    color: var(--text-sec);
    margin-bottom: 8px;
    line-height: 1.5;
}

.idle-modal-countdown {
    font-size: 2.5rem;
    font-weight: 800;
    font-family: var(--mono);
    color: var(--text);
    margin: 16px 0;
    letter-spacing: 2px;
}
.idle-modal-countdown span {
    color: var(--red);
}

.idle-modal-bar {
    width: 100%;
    height: 4px;
    background: rgba(255,255,255,0.06);
    border-radius: 2px;
    margin-bottom: 24px;
    overflow: hidden;
}
.idle-modal-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--red), #f59e0b);
    border-radius: 2px;
    transition: width 1s linear;
}

.idle-modal-actions {
    display: flex;
    gap: 12px;
}

.idle-btn-stay {
    flex: 1;
    padding: 12px 20px;
    background: var(--cyan-grad);
    color: #0b1120;
    border: none;
    border-radius: var(--r-md);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 700;
    cursor: pointer;
    transition: var(--transition);
}
.idle-btn-stay:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(34, 211, 238, 0.3);
}

.idle-btn-logout {
    flex: 1;
    padding: 12px 20px;
    background: transparent;
    color: var(--text-sec);
    border: 1px solid var(--border);
    border-radius: var(--r-md);
    font-family: var(--font);
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: var(--transition);
}
.idle-btn-logout:hover {
    border-color: var(--red);
    color: var(--red);
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}