/* ============================================================================
   404 Page - Metallographic Microstructure Theme
   ============================================================================ */

.error-page {
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
    text-align: center;
    padding: 100px 20px 60px;
    overflow: hidden;
}

/* Microstructure grain boundary background */
.micro-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
    pointer-events: none;
}

.micro-svg {
    width: 100%;
    height: 100%;
}

.grains {
    animation: grainShift 25s ease-in-out infinite alternate;
}

@keyframes grainShift {
    0% { opacity: 0.3; }
    50% { opacity: 0.45; }
    100% { opacity: 0.3; }
}

.triple-points circle {
    animation: pulsePoint 4s ease-in-out infinite;
}

.triple-points circle:nth-child(even) {
    animation-delay: -2s;
}

@keyframes pulsePoint {
    0%, 100% { opacity: 0.1; }
    50% { opacity: 0.25; }
}

/* Content container */
.error-container {
    position: relative;
    z-index: 1;
    max-width: 600px;
    margin: 0 auto;
}

/* Microscope crosshair icon */
.error-icon {
    margin-bottom: 20px;
    opacity: 0.9;
}

/* 404 number */
.error-container h1 {
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: clamp(5rem, 12vw, 9rem);
    font-weight: 700;
    color: var(--color-text-primary, #111827);
    margin: 0;
    line-height: 1;
    letter-spacing: -0.04em;
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 50%, #1e3a5f 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Subtitle */
.error-container h2 {
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: clamp(1.5rem, 4vw, 2rem);
    font-weight: 600;
    color: var(--color-text-primary, #111827);
    margin: 8px 0 16px;
    letter-spacing: -0.02em;
}

/* Description */
.error-container > p {
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: var(--font-size-lg, 1.125rem);
    color: var(--color-text-tertiary, #4b5563);
    line-height: 1.7;
    margin-bottom: 32px;
    max-width: 480px;
    margin-left: auto;
    margin-right: auto;
}

/* Primary CTA button */
.error-container .btn-primary {
    display: inline-block;
    padding: 14px 36px;
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: var(--font-size-base, 1rem);
    font-weight: 600;
    color: #fff;
    background: var(--color-primary, #2563eb);
    border: none;
    border-radius: var(--border-radius-xl, 1rem);
    text-decoration: none;
    transition: background-color 0.2s ease, transform 0.2s ease, box-shadow 0.2s ease;
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

.error-container .btn-primary:hover {
    background: var(--color-primary-hover, #1d4ed8);
    transform: translateY(-1px);
    box-shadow: 0 4px 16px rgba(37, 99, 235, 0.35);
}

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

/* Suggestion links section */
.error-suggestions {
    margin-top: 48px;
    padding-top: 32px;
    border-top: 1px solid var(--color-border, #e5e7eb);
}

.suggestions-label {
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: var(--font-size-sm, 0.875rem);
    color: var(--color-text-light, #6b7280);
    margin-bottom: 16px;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-weight: 500;
}

.suggestion-links {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
}

.suggestion-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    font-family: var(--font-family, 'Inter', sans-serif);
    font-size: var(--font-size-sm, 0.875rem);
    font-weight: 500;
    color: var(--color-text-secondary, #374151);
    background: #fff;
    border: 1px solid var(--color-border, #e5e7eb);
    border-radius: var(--border-radius-lg, 0.75rem);
    text-decoration: none;
    transition: all 0.2s ease;
}

.suggestion-link:hover {
    color: var(--color-primary, #2563eb);
    border-color: var(--color-primary, #2563eb);
    background: rgba(37, 99, 235, 0.04);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.suggestion-link svg {
    flex-shrink: 0;
    opacity: 0.7;
}

.suggestion-link:hover svg {
    opacity: 1;
}

/* ================================
   Responsive
   ================================ */

@media (max-width: 640px) {
    .error-page {
        padding: 100px 16px 40px;
        min-height: 60vh;
    }

    .error-icon svg {
        width: 90px;
        height: 90px;
    }

    .error-container > p {
        font-size: var(--font-size-base, 1rem);
    }

    .suggestion-links {
        flex-direction: column;
        align-items: center;
    }

    .suggestion-link {
        width: 100%;
        max-width: 240px;
        justify-content: center;
    }
}