/* ==========================================================================
   CSS Variables & Reset
   ========================================================================== */
:root {
    --primary-color: #d1121d;
    /* Deep Blood Red */
    --primary-glow: rgba(209, 18, 29, 0.6);
    --bg-dark: #0a0a0c;
    --bg-darker: #050506;
    --bg-surface: #121215;
    --text-main: #f0f0f0;
    --text-muted: #888899;
    --border-color: rgba(255, 255, 255, 0.1);

    --font-sans: 'Noto Sans SC', sans-serif;
    --font-heading: 'Oswald', 'Noto Sans SC', sans-serif;

    --header-height: 80px;
    --glass-bg: rgba(10, 10, 12, 0.75);
    --glass-border: rgba(255, 255, 255, 0.05);
    --transition-fast: 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
    --transition-slow: 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

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

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

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

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

img,
video {
    max-width: 100%;
    height: auto;
    display: block;
}

/* ==========================================================================
   Typography & Utilities
   ========================================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
}

::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: #333;
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-color);
}

.container {
    width: 100%;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 2rem;
}

.section {
    position: relative;
    padding: 100px 0;
    z-index: 1;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    position: relative;
    display: inline-block;
    text-transform: uppercase;
    letter-spacing: 2px;
}

.section-title span {
    color: var(--primary-color);
    font-size: 0.5em;
    vertical-align: middle;
    margin-left: 10px;
    opacity: 0.8;
}

.section-title::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: -10px;
    width: 60px;
    height: 4px;
    background: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-glow);
}

.section-subtitle {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 3rem;
    font-style: italic;
    opacity: 0.7;
}

/* ==========================================================================
   Header Navbar (Glassmorphism)
   ========================================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--glass-border);
    z-index: 100;
    transition: transform var(--transition-fast);
}

.header.scrolled-down {
    transform: translateY(-100%);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 100%;
    max-width: 1600px;
    margin: 0 auto;
    padding: 0 2rem;
}

.logo-area {
    display: flex;
    align-items: center;
    gap: 15px;
}

.logo {
    height: 50px;
    width: auto;
    filter: drop-shadow(0 0 8px rgba(255, 255, 255, 0.2));
}

.site-title h1 {
    font-size: 1.25rem;
    letter-spacing: 1px;
    color: #fff;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.5);
}

.site-title p {
    font-size: 0.75rem;
    color: var(--text-muted);
    letter-spacing: 0.5px;
}

.desktop-nav {
    display: flex;
    gap: 30px;
    align-items: center;
}

.nav-link {
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    padding: 5px 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width var(--transition-fast);
    box-shadow: 0 0 8px var(--primary-glow);
}

.nav-link:hover::after,
.nav-link.active::after {
    width: 100%;
}

.nav-link:hover {
    color: #fff;
}

.btn-download-top {
    background: linear-gradient(135deg, var(--primary-color), #a00);
    color: #fff;
    padding: 10px 24px;
    border-radius: 4px;
    font-weight: 700;
    letter-spacing: 1px;
    transition: all var(--transition-fast);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.btn-download-top:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--primary-glow);
    background: linear-gradient(135deg, #e61a26, #b30000);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 6px;
    cursor: pointer;
    z-index: 102;
}

.mobile-menu-btn span {
    display: block;
    width: 30px;
    height: 2px;
    background: #fff;
    transition: all var(--transition-fast);
}

.mobile-menu-btn.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

.mobile-menu-btn.open span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-btn.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}

/* ==========================================================================
   Mobile Navigation Overlay
   ========================================================================== */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(5, 5, 6, 0.95);
    backdrop-filter: blur(15px);
    z-index: 101;
    display: flex;
    justify-content: center;
    align-items: center;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.mobile-nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

.mobile-nav {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.mobile-nav-link {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 2px;
    transform: translateY(20px);
    opacity: 0;
    transition: all 0.4s ease;
}

.mobile-nav-overlay.active .mobile-nav-link {
    transform: translateY(0);
    opacity: 1;
}

.mobile-nav-link:nth-child(1) {
    transition-delay: 0.1s;
}

.mobile-nav-link:nth-child(2) {
    transition-delay: 0.2s;
}

.mobile-nav-link:nth-child(3) {
    transition-delay: 0.3s;
}

.mobile-nav-link:nth-child(4) {
    transition-delay: 0.4s;
}

.mobile-nav-link.highlight {
    color: var(--primary-color);
    text-shadow: 0 0 10px var(--primary-glow);
}

/* ==========================================================================
   Hero Section
   ========================================================================== */
.hero-section {
    position: relative;
    height: 100vh;
    min-height: 700px;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    padding: 0;
}

.hero-bg-wrapper {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
}

.hero-video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    position: absolute;
    top: 0;
    left: 0;
}

.hero-image-bg {
    width: 100%;
    height: 100%;
    background-image: url('../开屏图片.png');
    background-size: cover;
    background-position: center;
    position: absolute;
    top: 0;
    left: 0;
    opacity: 0.5;
    /* Fallback opacity or blending */
    mix-blend-mode: overlay;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to bottom, rgba(0, 0, 0, 0.2) 0%, rgba(5, 5, 6, 0.8) 80%, var(--bg-dark) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    width: 100%;
    max-width: 800px;
    padding: 0 20px;
    margin-top: 50px;
}

.age-rating {
    position: absolute;
    top: 20px;
    left: 20px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 4px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    width: 60px;
}

.age-16 {
    background: #4caf50;
    color: #fff;
    font-weight: 900;
    font-size: 1.2rem;
    padding: 2px 0;
}

.age-text {
    font-size: 0.5rem;
    padding: 4px;
    color: #ffd700;
    line-height: 1.2;
}

.glitch-text {
    font-size: clamp(2.5rem, 10vw, 5rem);
    font-weight: 900;
    text-transform: uppercase;
    position: relative;
    color: #fff;
    letter-spacing: 5px;
    text-shadow: 0 0 20px rgba(255, 255, 255, 0.3);
}

.glitch-text::before,
.glitch-text::after {
    content: attr(data-text);
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.glitch-text::before {
    left: 2px;
    text-shadow: -2px 0 var(--primary-color);
    clip: rect(24px, 550px, 90px, 0);
    animation: glitch-anim 3s infinite linear alternate-reverse;
}

.glitch-text::after {
    left: -2px;
    text-shadow: -2px 0 #0ff;
    clip: rect(85px, 550px, 140px, 0);
    animation: glitch-anim 2.5s infinite linear alternate-reverse;
}

@keyframes glitch-anim {
    0% {
        clip: rect(10px, 9999px, 83px, 0);
        transform: skew(0.6deg);
    }

    5% {
        clip: rect(32px, 9999px, 14px, 0);
        transform: skew(0.9deg);
    }

    10% {
        clip: rect(61px, 9999px, 90px, 0);
        transform: skew(0.1deg);
    }

    15% {
        clip: rect(11px, 9999px, 86px, 0);
        transform: skew(0.7deg);
    }

    20% {
        clip: rect(54px, 9999px, 16px, 0);
        transform: skew(0.2deg);
    }

    25% {
        clip: rect(93px, 9999px, 44px, 0);
        transform: skew(0.5deg);
    }

    30% {
        clip: rect(78px, 9999px, 3px, 0);
        transform: skew(0.4deg);
    }

    35% {
        clip: rect(26px, 9999px, 29px, 0);
        transform: skew(0.8deg);
    }

    40% {
        clip: rect(4px, 9999px, 63px, 0);
        transform: skew(0.3deg);
    }

    45% {
        clip: rect(81px, 9999px, 11px, 0);
        transform: skew(0.1deg);
    }

    50% {
        clip: rect(15px, 9999px, 75px, 0);
        transform: skew(0.6deg);
    }

    55% {
        clip: rect(96px, 9999px, 51px, 0);
        transform: skew(0.2deg);
    }

    60% {
        clip: rect(41px, 9999px, 20px, 0);
        transform: skew(0.9deg);
    }

    65% {
        clip: rect(59px, 9999px, 88px, 0);
        transform: skew(0.5deg);
    }

    70% {
        clip: rect(22px, 9999px, 33px, 0);
        transform: skew(0.7deg);
    }

    75% {
        clip: rect(87px, 9999px, 68px, 0);
        transform: skew(0.4deg);
    }

    80% {
        clip: rect(9px, 9999px, 95px, 0);
        transform: skew(0.8deg);
    }

    85% {
        clip: rect(47px, 9999px, 24px, 0);
        transform: skew(0.3deg);
    }

    90% {
        clip: rect(73px, 9999px, 57px, 0);
        transform: skew(0.6deg);
    }

    95% {
        clip: rect(38px, 9999px, 82px, 0);
        transform: skew(0.1deg);
    }

    100% {
        clip: rect(65px, 9999px, 49px, 0);
        transform: skew(0.9deg);
    }
}

.sub-title {
    font-size: clamp(1.2rem, 3.5vw, 1.8rem);
    letter-spacing: 10px;
    margin-left: 10px;
    /* offset for letter spacing */
    margin-bottom: 2rem;
    color: #e0e0e0;
}

.hero-action {
    margin-top: 3rem;
}

.btn-download-main {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    background: linear-gradient(135deg, rgba(209, 18, 29, 0.9) 0%, rgba(138, 0, 0, 0.9) 100%);
    position: relative;
    padding: 20px 60px;
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    overflow: hidden;
    transition: all var(--transition-fast);
}

.btn-download-main:hover {
    box-shadow: 0 10px 40px var(--primary-glow);
    transform: scale(1.05);
}

.btn-download-main .btn-text {
    position: relative;
    z-index: 1;
    font-size: 2rem;
    font-weight: 900;
    letter-spacing: 4px;
    color: #fff;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.8);
}

.btn-download-main .btn-subtext {
    position: relative;
    z-index: 1;
    font-size: 0.8rem;
    letter-spacing: 8px;
    color: var(--primary-color);
    font-family: var(--font-heading);
}

.scroll-indicator {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    opacity: 0.7;
    animation: bounce 2s infinite;
}

.mouse {
    width: 24px;
    height: 36px;
    border: 2px solid #fff;
    border-radius: 12px;
    position: relative;
}

.mouse::before {
    content: '';
    position: absolute;
    top: 6px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: #fff;
    border-radius: 2px;
    animation: scroll-wheel 1.5s infinite;
}

@keyframes scroll-wheel {
    0% {
        top: 6px;
        opacity: 1;
    }

    100% {
        top: 20px;
        opacity: 0;
    }
}

@keyframes bounce {

    0%,
    20%,
    50%,
    80%,
    100% {
        transform: translateY(0) translateX(-50%);
    }

    40% {
        transform: translateY(-10px) translateX(-50%);
    }

    60% {
        transform: translateY(-5px) translateX(-50%);
    }
}

/* ==========================================================================
   Characters Section
   ========================================================================== */
.characters-section {
    background: var(--bg-surface);
    position: relative;
}

.section-bg-effect {
    position: absolute;
    top: 50%;
    left: 0;
    width: 100%;
    height: 50%;
    background: radial-gradient(circle at center, rgba(209, 18, 29, 0.05) 0%, transparent 70%);
    pointer-events: none;
}

.character-slider-container {
    margin-bottom: 40px;
    width: 100%;
    overflow-x: auto;
    padding-bottom: 20px;
    scroll-snap-type: x mandatory;
}

.character-slider {
    display: flex;
    gap: 15px;
    padding: 0 10px;
    width: max-content;
}

.char-thumb {
    width: 80px;
    height: 80px;
    border-radius: 8px;
    cursor: pointer;
    overflow: hidden;
    position: relative;
    border: 2px solid transparent;
    transition: all var(--transition-fast);
    scroll-snap-align: center;
    background: #1a1a20;
    display: flex;
    align-items: center;
    justify-content: center;
}

.char-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.6;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
}

.char-thumb:hover {
    border-color: rgba(255, 255, 255, 0.3);
}

.char-thumb:hover img {
    opacity: 0.8;
    transform: scale(1.1);
}

.char-thumb.active {
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(209, 18, 29, 0.4);
}

.char-thumb.active img {
    opacity: 1;
    transform: scale(1.1);
}

.character-detail-display {
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.3);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 20px;
    position: relative;
    overflow: hidden;
}

.character-detail-display::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 70%;
    height: 200%;
    background: radial-gradient(circle, var(--primary-glow) 0%, transparent 70%);
    opacity: 0.1;
    transform: rotate(30deg);
}

.character-image-box {
    height: 60vh;
    min-height: 400px;
    max-height: 600px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
}

.character-image-box img {
    max-height: 100%;
    filter: drop-shadow(10px 10px 20px rgba(0, 0, 0, 0.8));
    animation: float 6s ease-in-out infinite;
    transition: opacity 0.5s ease;
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-15px);
    }

    100% {
        transform: translateY(0px);
    }
}



/* ==========================================================================
   Monsters Section
   ========================================================================== */
.monsters-section {
    background: var(--bg-dark);
    position: relative;
}

.monster-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin-top: 40px;
}

.monster-card {
    position: relative;
    border-radius: 8px;
    overflow: hidden;
    aspect-ratio: 3/4;
    cursor: pointer;
    background: #111;
    border: 1px solid var(--border-color);
    transition: all var(--transition-fast);
}

.monster-card img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    padding: 20px;
    filter: grayscale(80%) contrast(1.2);
    transition: all var(--transition-slow);
}

.monster-card::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.9) 0%, transparent 60%);
    opacity: 0.8;
    transition: opacity var(--transition-fast);
}

.monster-id {
    position: absolute;
    bottom: 15px;
    left: 15px;
    z-index: 2;
    font-family: var(--font-heading);
    color: var(--primary-color);
    font-size: 1.2rem;
    letter-spacing: 2px;
    transform: translateY(0);
    transition: transform var(--transition-fast);
}

.monster-card:hover {
    border-color: var(--primary-color);
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5), 0 0 15px rgba(209, 18, 29, 0.2);
}

.monster-card:hover img {
    filter: grayscale(0%) contrast(1.1);
    transform: scale(1.1);
}

.monster-card:hover::after {
    opacity: 0.6;
}

.monster-card:hover .monster-id {
    transform: translateY(-5px);
    text-shadow: 0 0 8px var(--primary-glow);
}

/* ==========================================================================
   Floating Download Button
   ========================================================================== */
.floating-download {
    position: fixed;
    bottom: 30px;
    right: 30px;
    z-index: 99;
    display: none;
    /* Shown on mobile */
}

.btn-download-float {
    background: var(--primary-color);
    color: #fff;
    border-radius: 50px;
    padding: 15px 25px;
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.4), 0 0 15px var(--primary-glow);
    transition: all var(--transition-fast);
}

.download-icon {
    width: 24px;
    height: 24px;
}

.btn-download-float:hover {
    transform: scale(1.05) translateY(-5px);
    background: #e61a26;
}

/* ==========================================================================
   Footer
   ========================================================================== */
.footer {
    background: #020202;
    padding: 60px 0;
    border-top: 1px solid var(--border-color);
}

.footer-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
    text-align: center;
}

.footer-logo img {
    height: 60px;
    filter: grayscale(100%) opacity(0.5);
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
    justify-content: center;
}

.footer-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: #fff;
}

.footer-info p {
    color: #555;
    font-size: 0.8rem;
    margin-bottom: 5px;
}

/* ==========================================================================
   Responsive Design
   ========================================================================== */
@media (max-width: 992px) {
    .character-image-box {
        height: 50vh;
        min-height: 350px;
    }
}

@media (max-width: 768px) {

    .desktop-nav,
    .btn-download-top {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    h1,
    h2 {
        font-size: 2rem;
    }

    .glitch-text {
        font-size: 3rem;
    }

    .floating-download {
        display: block;
    }

    .section {
        padding: 60px 0;
    }

    .monster-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px;
    }
}

@media (max-width: 480px) {
    .monster-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .btn-download-main {
        padding: 15px 30px;
        width: 100%;
    }

    .btn-download-main .btn-text {
        font-size: 1.5rem;
    }
}