/* ─────────────────────────────────────────────────────────────────────────────
   TeachCloud - Error Pages Stylesheet (404 & 502)
   Blueprint & Cyberpunk Dark Aesthetic, Glassmorphism, Micro-Animations
   ───────────────────────────────────────────────────────────────────────────── */

.error-page-section {
    min-height: calc(100vh - 220px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    position: relative;
}

.error-container {
    width: 100%;
    max-width: 860px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 2;
}

/* ── Error Header Card ── */
.error-card {
    background: var(--card-bg, rgba(22, 27, 34, 0.85));
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    border-radius: var(--radius-lg, 16px);
    padding: 3.5rem 2.5rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), 0 0 40px var(--accent-glow, rgba(0, 212, 255, 0.15));
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    position: relative;
    overflow: hidden;
    transition: var(--transition, all 0.25s ease);
}

.error-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--accent-gradient, linear-gradient(135deg, #00d4ff 0%, #a855f7 100%));
}

.error-card.card-502::before {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 50%, #a855f7 100%);
}

/* ── Status Badge ── */
.error-status-badge {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 6px 16px;
    border-radius: 30px;
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.82rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    margin-bottom: 1.75rem;
    border: 1px solid rgba(0, 212, 255, 0.3);
    background: rgba(0, 212, 255, 0.08);
    color: var(--accent-cyan, #00d4ff);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.15);
    animation: float-badge 4s ease-in-out infinite;
}

.error-status-badge.badge-502 {
    border-color: rgba(245, 158, 11, 0.4);
    background: rgba(245, 158, 11, 0.1);
    color: #f59e0b;
    box-shadow: 0 0 15px rgba(245, 158, 11, 0.2);
}

.status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: #00d4ff;
    box-shadow: 0 0 8px #00d4ff;
    animation: status-blink 1.5s infinite ease-in-out;
}

.status-dot.dot-warning {
    background: #f59e0b;
    box-shadow: 0 0 8px #f59e0b;
}

.status-dot.dot-danger {
    background: #ef4444;
    box-shadow: 0 0 8px #ef4444;
}

/* ── Error Code Hero Number ── */
.error-code-wrapper {
    position: relative;
    display: inline-block;
    margin-bottom: 1.25rem;
}

.error-code {
    font-size: clamp(5.5rem, 15vw, 8.5rem);
    font-weight: 900;
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    line-height: 1;
    letter-spacing: -0.04em;
    background: var(--accent-gradient, linear-gradient(135deg, #00d4ff 0%, #a855f7 100%));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 10px 25px rgba(0, 212, 255, 0.35));
    user-select: none;
    margin: 0;
}

.error-code.code-502 {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 60%, #a855f7 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    filter: drop-shadow(0 10px 25px rgba(239, 68, 68, 0.35));
}

.error-code-glitch {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.15;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.8), transparent);
    animation: scanline 3.5s linear infinite;
    pointer-events: none;
}

/* ── Titles & Description ── */
.error-title {
    font-size: clamp(1.5rem, 3.5vw, 2.25rem);
    font-weight: 800;
    color: var(--text-primary, #e6edf3);
    margin-bottom: 0.75rem;
    letter-spacing: -0.02em;
}

.error-desc {
    font-size: 1.05rem;
    line-height: 1.6;
    color: var(--text-secondary, #8b949e);
    max-width: 580px;
    margin: 0 auto 2rem;
}

/* ── Interactive Diagnostic Box (Terminal Style) ── */
.error-terminal {
    background: rgba(13, 17, 23, 0.95);
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    border-radius: var(--radius-md, 10px);
    padding: 1rem 1.25rem;
    margin: 0 auto 2.5rem;
    max-width: 620px;
    text-align: left;
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.85rem;
    box-shadow: inset 0 2px 6px rgba(0, 0, 0, 0.4);
}

.terminal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding-bottom: 0.5rem;
    margin-bottom: 0.75rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.terminal-dots {
    display: flex;
    gap: 6px;
}

.terminal-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
}
.dot-red { background: #ef4444; }
.dot-yellow { background: #f59e0b; }
.dot-green { background: #10b981; }

.terminal-label {
    color: var(--text-muted, #484f58);
    font-size: 0.75rem;
    font-weight: 500;
}

.terminal-body {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    color: var(--text-secondary, #8b949e);
}

.terminal-line {
    display: flex;
    align-items: baseline;
    gap: 8px;
    word-break: break-all;
}

.terminal-prompt {
    color: var(--accent-cyan, #00d4ff);
    font-weight: 700;
}

.terminal-line.text-warn {
    color: #f59e0b;
}

.terminal-line.text-danger {
    color: #ef4444;
}

.terminal-line.text-success {
    color: #10b981;
}

/* ── 502 Network Topology Visualization ── */
.network-topology {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin: 1.5rem auto 2rem;
    padding: 1.25rem;
    background: rgba(13, 17, 23, 0.6);
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    border-radius: var(--radius-md, 10px);
    max-width: 600px;
}

.node-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 6px;
}

.node-icon {
    width: 46px;
    height: 46px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-tertiary, #1c2333);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    font-size: 1.25rem;
    transition: var(--transition);
}

.node-item.node-ok .node-icon {
    border-color: #10b981;
    color: #10b981;
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.25);
}

.node-item.node-fail .node-icon {
    border-color: #ef4444;
    color: #ef4444;
    background: rgba(239, 68, 68, 0.1);
    box-shadow: 0 0 16px rgba(239, 68, 68, 0.35);
    animation: status-blink 1.2s infinite ease-in-out;
}

.node-label {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--text-secondary);
}

.node-item.node-fail .node-label {
    color: #ef4444;
}

.node-connector {
    flex-grow: 1;
    height: 2px;
    background: rgba(48, 54, 61, 0.9);
    position: relative;
    min-width: 40px;
}

.node-connector.connector-ok {
    background: linear-gradient(90deg, #10b981, #00d4ff);
}

.node-connector.connector-fail {
    background: repeating-linear-gradient(90deg, #ef4444, #ef4444 6px, transparent 6px, transparent 12px);
    animation: move-stripes 1s linear infinite;
}

/* ── Live Auto-Retry Countdown & Ping Widget ── */
.retry-widget {
    background: rgba(245, 158, 11, 0.08);
    border: 1px solid rgba(245, 158, 11, 0.25);
    border-radius: var(--radius-md, 10px);
    padding: 0.85rem 1.25rem;
    margin: 0 auto 2rem;
    max-width: 460px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-primary);
}

.retry-badge {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    font-family: var(--font-mono);
    color: #f59e0b;
    font-weight: 700;
}

.btn-retry-inline {
    background: #f59e0b;
    color: #0d1117;
    border: none;
    padding: 0.4rem 0.85rem;
    border-radius: var(--radius-sm, 6px);
    font-weight: 700;
    font-size: 0.78rem;
    cursor: pointer;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    gap: 4px;
}

.btn-retry-inline:hover {
    background: #fbbf24;
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(245, 158, 11, 0.4);
}

/* ── Search Input inside 404 ── */
.error-search-box {
    max-width: 520px;
    margin: 0 auto 2.25rem;
}

.error-search-form {
    display: flex;
    align-items: center;
    position: relative;
    background: var(--bg-primary, #0d1117);
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    border-radius: 30px;
    padding: 4px 6px 4px 18px;
    transition: var(--transition);
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.3);
}

.error-search-form:focus-within {
    border-color: var(--accent-cyan, #00d4ff);
    box-shadow: 0 0 20px rgba(0, 212, 255, 0.25);
}

.error-search-input {
    flex-grow: 1;
    background: transparent;
    border: none;
    outline: none;
    color: var(--text-primary, #e6edf3);
    font-size: 0.92rem;
    padding: 0.6rem 0;
}

.error-search-btn {
    background: var(--accent-gradient, linear-gradient(135deg, #00d4ff 0%, #a855f7 100%));
    border: none;
    color: #fff;
    padding: 0.6rem 1.25rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    transition: var(--transition);
}

.error-search-btn:hover {
    filter: brightness(1.1);
    transform: scale(1.02);
}

/* ── Action Buttons ── */
.error-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 2.5rem;
}

.btn-error-primary {
    background: var(--accent-gradient, linear-gradient(135deg, #00d4ff 0%, #a855f7 100%));
    color: #ffffff !important;
    padding: 0.75rem 1.6rem;
    border-radius: var(--radius-sm, 8px);
    font-weight: 700;
    font-size: 0.92rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    box-shadow: 0 4px 20px rgba(0, 212, 255, 0.3);
    border: none;
    cursor: pointer;
}

.btn-error-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(0, 212, 255, 0.45);
}

.btn-error-primary.btn-warning {
    background: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    box-shadow: 0 4px 20px rgba(245, 158, 11, 0.35);
}

.btn-error-primary.btn-warning:hover {
    box-shadow: 0 6px 25px rgba(245, 158, 11, 0.5);
}

.btn-error-secondary {
    background: var(--bg-tertiary, #1c2333);
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    color: var(--text-primary, #e6edf3) !important;
    padding: 0.75rem 1.4rem;
    border-radius: var(--radius-sm, 8px);
    font-weight: 600;
    font-size: 0.92rem;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
    cursor: pointer;
}

.btn-error-secondary:hover {
    border-color: var(--accent-cyan, #00d4ff);
    color: var(--accent-cyan, #00d4ff) !important;
    transform: translateY(-2px);
    background: rgba(0, 212, 255, 0.08);
}

/* ── Suggested Hubs / Navigation Grid ── */
.error-hubs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 1rem;
    margin-top: 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.06);
    padding-top: 2rem;
    text-align: left;
}

.error-hub-card {
    background: rgba(13, 17, 23, 0.5);
    border: 1px solid var(--border-color, rgba(48, 54, 61, 0.9));
    border-radius: var(--radius-md, 10px);
    padding: 1.1rem;
    text-decoration: none;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    transition: var(--transition);
}

.error-hub-card:hover {
    border-color: var(--accent-cyan, #00d4ff);
    background: rgba(0, 212, 255, 0.04);
    transform: translateY(-3px);
    box-shadow: 0 6px 18px rgba(0, 0, 0, 0.4);
}

.error-hub-icon {
    font-size: 1.4rem;
    margin-bottom: 0.2rem;
}

.error-hub-title {
    font-size: 0.9rem;
    font-weight: 700;
    color: var(--text-primary, #e6edf3);
}

.error-hub-desc {
    font-size: 0.78rem;
    color: var(--text-secondary, #8b949e);
    line-height: 1.4;
}

/* ── Animations ── */
@keyframes float-badge {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-4px); }
}

@keyframes status-blink {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.4; transform: scale(0.85); }
}

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

@keyframes move-stripes {
    0% { background-position: 0 0; }
    100% { background-position: 24px 0; }
}

/* ── Responsive adjustments ── */
@media (max-width: 640px) {
    .error-card {
        padding: 2.5rem 1.25rem;
    }
    .error-actions {
        flex-direction: column;
    }
    .btn-error-primary, .btn-error-secondary {
        width: 100%;
        justify-content: center;
    }
    .network-topology {
        gap: 0.75rem;
        padding: 0.75rem;
    }
    .node-icon {
        width: 38px;
        height: 38px;
        font-size: 1rem;
    }
    .node-connector {
        min-width: 20px;
    }
    .error-hubs-grid {
        grid-template-columns: 1fr;
    }
}