:root {
    --bg-deep: #0a0a0f;
    --bg-primary: #12121a;
    --bg-secondary: #1a1a25;
    --accent-primary: #8b3a62;
    --accent-secondary: #5e2a8b;
    --accent-light: #d4a5c9;
    --text-primary: #ffffff;
    --text-secondary: #b8b8c8;
    --text-muted: #6b6b7b;
    --glass-bg: rgba(255, 255, 255, 0.03);
    --glass-border: rgba(255, 255, 255, 0.08);
}

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

body {
    font-family: 'Montserrat', sans-serif;
    background: var(--bg-deep);
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
}

.bg-grid {
    position: fixed;
    inset: 0;
    background-image: 
        linear-gradient(rgba(139, 58, 98, 0.03) 1px, transparent 1px),
        linear-gradient(90deg, rgba(139, 58, 98, 0.03) 1px, transparent 1px);
    background-size: 50px 50px;
    pointer-events: none;
}

.bg-glow {
    position: fixed;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    filter: blur(150px);
    opacity: 0.15;
    pointer-events: none;
}

.bg-glow-1 {
    top: -200px;
    left: -200px;
    background: var(--accent-primary);
    animation: float 8s ease-in-out infinite;
}

.bg-glow-2 {
    bottom: -200px;
    right: -200px;
    background: var(--accent-secondary);
    animation: float 8s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, 30px); }
}

.particles {
    position: fixed;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--accent-light);
    border-radius: 50%;
    opacity: 0.3;
    animation: rise 10s linear infinite;
}

@keyframes rise {
    0% { transform: translateY(100vh) scale(0); opacity: 0; }
    10% { opacity: 0.3; }
    90% { opacity: 0.3; }
    100% { transform: translateY(-100vh) scale(1); opacity: 0; }
}

.container {
    text-align: center;
    z-index: 10;
    padding: 2rem;
    max-width: 600px;
}

.error-code {
    font-size: clamp(8rem, 25vw, 14rem);
    font-weight: 700;
    line-height: 1;
    position: relative;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary), var(--accent-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: glitch 3s infinite;
    cursor: pointer;
    user-select: none;
    transition: transform 0.3s ease, filter 0.3s ease;
}

.error-code:hover {
    transform: scale(1.05);
    filter: brightness(1.2);
}

.error-code:active {
    transform: scale(0.98);
}

.error-code::before,
.error-code::after {
    content: '404';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    opacity: 0.8;
}

.error-code::before {
    animation: glitch-1 0.3s infinite linear alternate-reverse;
    clip-path: polygon(0 0, 100% 0, 100% 35%, 0 35%);
}

.error-code::after {
    animation: glitch-2 0.3s infinite linear alternate-reverse;
    clip-path: polygon(0 65%, 100% 65%, 100% 100%, 0 100%);
}

@keyframes glitch {
    0%, 90%, 100% { transform: translate(0); }
    92% { transform: translate(-2px, 2px); }
    94% { transform: translate(2px, -2px); }
    96% { transform: translate(-2px, -2px); }
    98% { transform: translate(2px, 2px); }
}

@keyframes glitch-1 {
    0% { transform: translate(0); }
    100% { transform: translate(-3px, 1px); }
}

@keyframes glitch-2 {
    0% { transform: translate(0); }
    100% { transform: translate(3px, -1px); }
}

.error-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: pulse-icon 2s ease-in-out infinite;
}

.error-icon svg {
    width: 40px;
    height: 40px;
    color: var(--accent-light);
}

@keyframes pulse-icon {
    0%, 100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(139, 58, 98, 0.4); }
    50% { transform: scale(1.05); box-shadow: 0 0 0 15px rgba(139, 58, 98, 0); }
}

.error-title {
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.error-message {
    font-size: 1rem;
    color: var(--text-muted);
    line-height: 1.7;
    margin-bottom: 2.5rem;
}

.error-message span {
    color: var(--accent-light);
}

.buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
}

.btn svg { width: 18px; height: 18px; }

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    box-shadow: 0 4px 20px rgba(139, 58, 98, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(139, 58, 98, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.portal {
    position: absolute;
    width: 300px;
    height: 300px;
    pointer-events: none;
    opacity: 0.1;
}

.portal-left { left: -100px; top: 50%; transform: translateY(-50%); }
.portal-right { right: -100px; top: 50%; transform: translateY(-50%); }

.portal-ring {
    position: absolute;
    inset: 0;
    border: 2px solid var(--accent-primary);
    border-radius: 50%;
    animation: rotate 10s linear infinite;
}

.portal-ring:nth-child(2) { inset: 20px; border-color: var(--accent-secondary); animation-duration: 8s; animation-direction: reverse; }
.portal-ring:nth-child(3) { inset: 40px; border-color: var(--accent-light); animation-duration: 6s; }

@keyframes rotate { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

.footer {
    position: fixed;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-muted);
    font-size: 0.85rem;
    z-index: 10;
}

.footer a { color: var(--accent-light); text-decoration: none; transition: color 0.3s ease; }
.footer a:hover { color: var(--text-primary); }

.logo-mini {
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* Responsive 404 */
@media (max-width: 768px) {
    .error-code { font-size: clamp(5rem, 20vw, 8rem); }
    .error-icon { width: 60px; height: 60px; margin-bottom: 1.5rem; }
    .error-icon svg { width: 30px; height: 30px; }
    .error-title { font-size: 1.4rem; }
    .error-message { font-size: 0.9rem; padding: 0 1rem; }
    .buttons { flex-direction: column; width: 100%; padding: 0 1rem; }
    .btn { width: 100%; justify-content: center; padding: 1rem 1.5rem; }
    .portal { display: none; }
    .footer { bottom: 1rem; font-size: 0.75rem; }
}

@media (max-width: 480px) {
    .container { padding: 1rem; }
    .error-code { font-size: clamp(4rem, 18vw, 6rem); margin-bottom: 0.5rem; }
    .error-icon { width: 50px; height: 50px; margin-bottom: 1rem; }
    .error-icon svg { width: 24px; height: 24px; }
    .error-title { font-size: 1.2rem; }
    .error-message { font-size: 0.85rem; margin-bottom: 2rem; }
    .btn { font-size: 0.9rem; padding: 0.875rem 1.25rem; }
}

@media (max-height: 600px) {
    .error-icon { display: none; }
    .error-code { margin-bottom: 0.5rem; }
    .error-title { font-size: 1.2rem; margin-bottom: 0.5rem; }
    .error-message { margin-bottom: 1.5rem; }
}