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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    background: var(--color-bg);
    color: var(--color-text);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    position: relative;
    overflow-x: hidden;
}

body::before {
    content: "";
    position: fixed;
    inset: 0;
    z-index: -2;
    pointer-events: none;
}

body.has-default-hell-bg::before {
    background:
        linear-gradient(180deg, rgba(8, 4, 4, 0.55) 0%, rgba(8, 4, 4, 0.88) 100%),
        var(--site-background-image),
        radial-gradient(ellipse 90% 60% at 50% 100%, rgba(139, 0, 0, 0.35), transparent 60%);
    background-size: auto, cover, auto;
    background-position: center, center, center;
    background-attachment: scroll, fixed, scroll;
}

body.has-site-background::before {
    background:
        linear-gradient(180deg, rgba(8, 4, 4, 0.72) 0%, rgba(8, 4, 4, 0.9) 100%),
        var(--site-background-image),
        radial-gradient(ellipse 100% 70% at 50% 100%, rgba(139, 0, 0, 0.4), transparent 55%);
    background-size: auto, cover, auto;
    background-position: center, center, center;
    background-attachment: scroll, fixed, scroll;
}

.hellscape {
    position: fixed;
    inset: 0;
    z-index: 0;
    pointer-events: none;
    overflow: hidden;
}

.hell-ember {
    position: absolute;
    width: 4px;
    height: 4px;
    border-radius: 50%;
    background: var(--color-ember);
    box-shadow: 0 0 8px var(--color-hell-glow), 0 0 16px var(--color-accent);
    opacity: 0;
    animation: ember-rise linear infinite;
}

@keyframes ember-rise {
    0% {
        opacity: 0;
        transform: translateY(0) translateX(0) scale(0.5);
    }
    10% {
        opacity: 1;
    }
    90% {
        opacity: 0.6;
    }
    100% {
        opacity: 0;
        transform: translateY(-100vh) translateX(var(--drift, 30px)) scale(0.2);
    }
}

.hell-imp {
    position: absolute;
    opacity: 0.12;
    animation: imp-float 8s ease-in-out infinite;
    filter: drop-shadow(0 0 12px rgba(255, 69, 0, 0.5));
    transition: opacity 0.3s ease;
}

.hell-imp svg {
    width: 100%;
    height: 100%;
    fill: var(--color-primary-light);
}

.hell-imp-1 {
    width: 72px;
    height: 72px;
    top: 12%;
    left: 4%;
    animation-delay: 0s;
}

.hell-imp-2 {
    width: 56px;
    height: 56px;
    top: 65%;
    right: 6%;
    animation-delay: -2.5s;
    animation-duration: 10s;
}

.hell-imp-3 {
    width: 48px;
    height: 48px;
    bottom: 18%;
    left: 8%;
    animation-delay: -5s;
    animation-duration: 12s;
}

.hell-imp-4 {
    width: 64px;
    height: 64px;
    top: 35%;
    right: 3%;
    animation-delay: -1s;
    animation-duration: 9s;
}

@keyframes imp-float {
    0%, 100% {
        transform: translateY(0) rotate(-5deg);
    }
    50% {
        transform: translateY(-18px) rotate(5deg);
    }
}

.hell-pentagram {
    position: absolute;
    top: 50%;
    left: 50%;
    width: min(90vw, 600px);
    height: min(90vw, 600px);
    transform: translate(-50%, -50%);
    opacity: 0.04;
    animation: pentagram-spin 120s linear infinite;
}

@keyframes pentagram-spin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

.site-header,
.flash-container,
.site-main,
.site-footer {
    position: relative;
    z-index: 1;
}

a {
    color: var(--color-hell-glow);
    text-decoration: none;
    transition: color var(--transition), text-shadow var(--transition);
}

a:hover {
    color: #ffb347;
    text-shadow: 0 0 12px rgba(255, 107, 53, 0.6);
}

.container {
    width: 100%;
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.25rem;
}

.container-narrow {
    max-width: 480px;
}

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(8, 4, 4, 0.88);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 24px rgba(139, 0, 0, 0.2);
}

.site-header::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent), transparent);
    opacity: 0.6;
    animation: header-glow 3s ease-in-out infinite;
}

@keyframes header-glow {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 0.9;
    }
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 76px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    color: var(--color-text);
    font-family: var(--font-display);
    font-weight: 700;
    letter-spacing: 0.04em;
}

.logo:hover {
    color: var(--color-text);
    text-shadow: 0 0 20px rgba(255, 69, 0, 0.5);
}

.logo-image {
    width: 44px;
    height: 44px;
    object-fit: contain;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow-hell);
}

.logo-mark {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--logo-bg-start, var(--color-primary-dark)), var(--logo-bg-end, var(--color-primary)));
    border: 1px solid var(--logo-border, var(--color-border-glow));
    border-radius: var(--radius-sm);
    font-family: var(--font-display);
    font-weight: 800;
    font-size: 1rem;
    line-height: 1;
    letter-spacing: 0.02em;
    color: #fff;
    box-shadow: var(--shadow-hell);
    position: relative;
    text-transform: uppercase;
}

.logo-mark[data-len="3"] {
    font-size: 0.78rem;
}

.logo-mark[data-len="4"],
.logo-mark[data-len="5"] {
    font-size: 0.65rem;
}

.logo-mark::before,
.logo-mark::after {
    content: "";
    position: absolute;
    top: -6px;
    width: 0;
    height: 0;
    border-left: 5px solid transparent;
    border-right: 5px solid transparent;
    border-bottom: 8px solid var(--logo-horn, var(--color-primary-light));
}

.logo-mark::before {
    left: 8px;
    transform: rotate(-12deg);
}

.logo-mark::after {
    right: 8px;
    transform: rotate(12deg);
}

.logo-text {
    font-size: 1.2rem;
    text-transform: uppercase;
    background: linear-gradient(180deg, #fff5f0 0%, var(--color-hell-glow) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav {
    display: flex;
    align-items: center;
    gap: 1.25rem;
}

.nav-link {
    color: var(--color-text-muted);
    font-weight: 600;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    font-size: 0.85rem;
}

.nav-link:hover {
    color: var(--color-text);
}

.nav-link-muted {
    opacity: 0.65;
}

.site-main {
    flex: 1;
    padding-bottom: 4rem;
}

.site-footer {
    border-top: 1px solid var(--color-border);
    padding: 1.75rem 0;
    color: var(--color-text-muted);
    font-size: 0.875rem;
    background: linear-gradient(0deg, rgba(139, 0, 0, 0.08), transparent);
}

.footer-inner p {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-inner p::before {
    content: "☠";
    opacity: 0.5;
    font-size: 0.9rem;
}

.flash-container {
    padding-top: 1rem;
}

.flash {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    border: 1px solid transparent;
    animation: flash-in 0.4s ease-out;
}

@keyframes flash-in {
    from {
        opacity: 0;
        transform: translateY(-8px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.flash-error {
    background: rgba(255, 68, 68, 0.12);
    border-color: rgba(255, 68, 68, 0.35);
    color: var(--color-error);
    box-shadow: 0 0 16px rgba(255, 68, 68, 0.15);
}

.flash-success {
    background: rgba(107, 255, 176, 0.1);
    border-color: rgba(107, 255, 176, 0.3);
    color: var(--color-success);
}

.flash-info {
    background: rgba(255, 140, 105, 0.12);
    border-color: rgba(255, 140, 105, 0.3);
    color: var(--color-info);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 700;
    font-size: 0.95rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::after {
    content: "";
    position: absolute;
    inset: 0;
    background: linear-gradient(105deg, transparent 40%, rgba(255, 255, 255, 0.12) 50%, transparent 60%);
    transform: translateX(-100%);
    transition: transform 0.5s ease;
}

.btn:not(:disabled):hover::after {
    transform: translateX(100%);
}

.btn:disabled {
    opacity: 0.45;
    cursor: not-allowed;
    transform: none !important;
}

.btn:not(:disabled):hover {
    transform: translateY(-2px);
}

.btn-primary {
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-primary-light));
    color: #fff5f0;
    border: 1px solid var(--color-border-glow);
    box-shadow: var(--shadow-hell);
    animation: btn-hell-pulse 3s ease-in-out infinite;
}

@keyframes btn-hell-pulse {
    0%, 100% {
        box-shadow: 0 0 16px rgba(255, 69, 0, 0.3), 0 8px 24px rgba(139, 0, 0, 0.5);
    }
    50% {
        box-shadow: 0 0 28px rgba(255, 69, 0, 0.55), 0 12px 32px rgba(139, 0, 0, 0.6);
    }
}

.btn-primary:not(:disabled):hover {
    box-shadow: 0 0 36px rgba(255, 69, 0, 0.7), 0 14px 40px rgba(139, 0, 0, 0.65);
}

.btn-accent {
    background: linear-gradient(135deg, var(--color-accent-dark), var(--color-accent));
    color: #1a0808;
    border: 1px solid rgba(255, 180, 100, 0.3);
    box-shadow: 0 0 20px rgba(255, 69, 0, 0.35);
}

.btn-outline {
    background: transparent;
    border: 1px solid var(--color-border-glow);
    color: var(--color-text);
}

.btn-outline:hover {
    border-color: var(--color-accent);
    color: var(--color-text);
    background: rgba(255, 69, 0, 0.08);
    box-shadow: 0 0 16px rgba(255, 69, 0, 0.2);
}

.btn-ghost {
    background: transparent;
    border: 1px solid transparent;
    color: var(--color-text-muted);
    text-transform: none;
    letter-spacing: normal;
    font-weight: 600;
}

.btn-ghost:hover {
    color: var(--color-hell-glow);
    background: rgba(255, 69, 0, 0.06);
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.05rem;
}

.btn-block {
    width: 100%;
}

.input,
.select {
    width: 100%;
    padding: 0.85rem 1rem;
    background: rgba(8, 4, 4, 0.8);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-sm);
    color: var(--color-text);
    font-family: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.input:focus,
.select:focus {
    outline: none;
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(196, 30, 58, 0.25), 0 0 20px rgba(255, 69, 0, 0.15);
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-label {
    display: block;
    margin-bottom: 0.4rem;
    font-weight: 600;
    font-size: 0.85rem;
    color: var(--color-text-muted);
    text-transform: uppercase;
    letter-spacing: 0.06em;
}

.form-error {
    display: block;
    margin-top: 0.35rem;
    font-size: 0.8rem;
    color: var(--color-error);
}

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.form-check-label {
    font-size: 0.9rem;
    color: var(--color-text-muted);
}

.checkbox {
    width: 1.1rem;
    height: 1.1rem;
    accent-color: var(--color-primary);
}

.hidden {
    display: none !important;
}

@media (max-width: 640px) {
    .hell-imp {
        opacity: 0.06;
    }

    .hell-imp-3,
    .hell-imp-4 {
        display: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .hell-ember,
    .hell-imp,
    .hell-pentagram,
    .btn-primary,
    .site-header::after {
        animation: none;
    }
}