/* Base Variables */
:root {
    --color-dark-forest: #0F1115;
    /* Deep green-black */
    --color-lighter-dark: #112215;
    --color-off-white: #e0e0e0;
    --color-accent-green: #4ade80;
    /* Tailwind brand green */
    --color-accent-red: #ef4444;
    --text-primary: #FFFFFF;
    --text-secondary: #AAAAAA;
    --glass-bg: rgba(255, 255, 255, 0.05);
    /* Softer */
    --glass-border: rgba(255, 255, 255, 0.05);
    /* Softer */
    --font-heading: 'Noto Sans TC', sans-serif;
    --font-body: 'Inter', sans-serif;

    /* Typography settings injected per user request */
    font-synthesis: none;
    text-rendering: optimizeLegibility;
}

/* Typography Overrides */
p,
.font-sans {
    font-family: 'Inter', system-ui, sans-serif;
}

h1,
h2,
h3,
.font-serif {
    font-family: 'Noto Serif TC', serif;
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    background-color: var(--color-dark-forest);
    color: var(--color-off-white);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
.logo {
    font-family: var(--font-heading);
}

/* Utility Classes (Simulating Tailwind roughly) */
.fixed {
    position: fixed;
}

.relative {
    position: relative;
}

.absolute {
    position: absolute;
}

.sticky {
    position: sticky;
}

.top-0 {
    top: 0;
}

.w-full {
    width: 100%;
}

.h-screen {
    height: 100vh;
}

.min-h-screen {
    min-height: 100vh;
}

.z-50 {
    z-index: 50;
}

.z-10 {
    z-index: 10;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.text-center {
    text-align: center;
}

.text-2xl {
    font-size: 1.5rem;
}

.text-3xl {
    font-size: 1.875rem;
}

.text-4xl {
    font-size: 2.25rem;
}

.text-5xl {
    font-size: 3rem;
}

.font-bold {
    font-weight: 700;
}

.p-6 {
    padding: 1.5rem;
}

.px-4 {
    padding-left: 1rem;
    padding-right: 1rem;
}

.py-20 {
    padding-top: 5rem;
    padding-bottom: 5rem;
}

.mb-4 {
    margin-bottom: 1rem;
}

.mb-8 {
    margin-bottom: 2rem;
}

.mt-4 {
    margin-top: 1rem;
}

.mt-8 {
    margin-top: 2rem;
}

.mt-12 {
    margin-top: 3rem;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
}

.hidden {
    display: none;
}

.block {
    display: block;
}

/* Colors */
.bg-dark-forest {
    background-color: var(--color-dark-forest);
}

.bg-lighter-dark {
    background-color: var(--color-lighter-dark);
}

.bg-black {
    background-color: #000;
}

.text-off-white {
    color: var(--color-off-white);
}

.text-green-400 {
    color: var(--color-accent-green);
}

.text-red-400 {
    color: var(--color-accent-red);
}

/* Glassmorphism Utilities */
.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.glass-strong {
    background: rgba(20, 20, 25, 0.6);
    /* Darker for legibility */
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.08);
}

.glass-card {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.03) 0%, rgba(255, 255, 255, 0.01) 100%);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    /* Softer border */
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.2);
    /* Softer shadow */
}

.glass-btn {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(4px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
}

.glass-btn:hover {
    background: rgba(255, 255, 255, 0.2);
    box-shadow: 0 0 15px rgba(255, 255, 255, 0.3);
}

/* Wood Texture Utility */
.wood-texture {
    background-color: #E6BC86;
    /* Light wood base */
    background-image:
        repeating-linear-gradient(75deg,
            rgba(160, 82, 45, 0.08) 0px,
            rgba(160, 82, 45, 0.08) 1px,
            transparent 1px,
            transparent 5px),
        repeating-linear-gradient(105deg,
            rgba(139, 69, 19, 0.05) 0px,
            rgba(139, 69, 19, 0.05) 2px,
            transparent 2px,
            transparent 8px);
    background-size: 100% 100%;
}

/* Dark Wood Texture (Frames/Accents) */
.wood-dark {
    background-color: #5D4037;
    background-image:
        repeating-linear-gradient(45deg,
            rgba(0, 0, 0, 0.2) 0px,
            rgba(0, 0, 0, 0.2) 2px,
            transparent 2px,
            transparent 4px);
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    border: 1px solid #3E2723;
}

.wood-accent-line {
    height: 4px;
    width: 60px;
    background-color: #8D6E63;
    background-image: linear-gradient(to right, #5D4037, #8D6E63, #5D4037);
    border-radius: 2px;
    margin-top: 0.5rem;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
}

/* Custom Components & Effects */

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}

.mix-blend-difference {
    mix-blend-mode: difference;
    color: white;
    /* Ensure visibility */
}

/* Navigation */
.menu-items a {
    text-decoration: none;
    color: inherit;
    transition: color 0.3s;
}

.menu-items a:hover {
    color: var(--color-accent-green);
}

/* Intro Section */
.perspective-container {
    perspective: 1000px;
    overflow: hidden;
}

.layer-bg,
.layer-mid {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
}

.layer-bg {
    background-image: url('hero_bg.png');
    z-index: 0;
    opacity: 0.5;
}

.layer-mid {
    /* Placeholder for mid layer if exists */
    background: radial-gradient(circle at center, transparent 0%, var(--color-dark-forest) 90%);
    z-index: 1;
}

/* Snake Visual Sticky Logic */
.snake-story-block {
    position: relative;
}

/* Important: The visual needs to be sticky within the block */
.sticky-visual {
    position: sticky;
    /* Make it sticky */
    top: 20vh;
    /* Stick 20vh from top */
    height: 60vh;
    /* Constrain height */
    align-self: flex-start;
    /* Align to top of flex container */
}

/* Snake Images */
.snake-visual img {
    transition: opacity 0.5s ease, transform 0.5s ease;
    max-height: 100%;
}

.snake-visual .visible {
    opacity: 1;
    transform: scale(1);
}

.snake-visual .hidden {
    opacity: 0;
    transform: scale(0.95);
    display: block;
    visibility: hidden;
}

/* Overriding display:none for transition */
.snake-visual .hidden.active-state {
    opacity: 1;
    transform: scale(1);
    visibility: visible;
}

/* Custom toggle class helper */

/* Dialogue Box Glassmorphism */
/* 對話框樣式：磨砂玻璃質感 */
.dialogue-box {
    background: rgba(255, 255, 255, 0.1);
    /* 半透明 */
    backdrop-filter: blur(10px);
    /* 模糊背景 */
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 12px;
    padding: 20px;
    font-family: 'Courier New', monospace;
    /* 使用等寬字體更有打字機感 */
    line-height: 1.6;
    min-height: 100px;
    /* 固定高度避免文字跳動 */
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.misconception-tag {
    display: inline-block;
    background: rgba(127, 29, 29, 0.5);
    color: #fecaca;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 700;
    border: 1px solid rgba(239, 68, 68, 0.3);
}

/* Interaction Section */
.interactive-ruler-game {
    width: 100%;
    margin-top: 2rem;
}

/* Animations */
@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    10%,
    30%,
    50%,
    70%,
    90% {
        transform: translateX(-5px);
    }

    20%,
    40%,
    60%,
    80% {
        transform: translateX(5px);
    }
}

.shake-anim {
    animation: shake 0.6s cubic-bezier(.36, .07, .19, .97) both;
    animation-play-state: paused;
    /* Trigger via JS */
}

@keyframes float {
    0% {
        transform: translateY(0px) rotate(-6deg);
    }

    50% {
        transform: translateY(-15px) rotate(-6deg);
    }

    100% {
        transform: translateY(0px) rotate(-6deg);
    }
}

.float-anim {
    animation: float 6s ease-in-out infinite;
}

@keyframes bounce {

    0%,
    100% {
        transform: translateY(-25%);
        animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
    }

    50% {
        transform: none;
        animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
    }
}

.animate-bounce {
    animation: bounce 1s infinite;
}

/* Typing Effect Cursor */
/* Typing Effect Cursor */
.typing-cursor::after {
    content: '|';
    animation: blink 1s step-start infinite;
    color: #FACC15;
    /* Brand Yellow */
}

@keyframes blink {
    50% {
        opacity: 0;
    }
}

/* Range Input Styling */
input[type=range] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    background: transparent;
}

input[type=range]::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 24px;
    width: 24px;
    border-radius: 50%;
    background: var(--color-accent-green);
    cursor: pointer;
    margin-top: -10px;
    /* You need to specify a margin in Chrome, but in Firefox and IE it is automatic */
    box-shadow: 0 0 10px rgba(74, 222, 128, 0.5);
}

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 2px;
}

/* Responsive */
@media (min-width: 768px) {
    .md\:w-1\/2 {
        width: 50%;
    }

    .md\:flex-row {
        flex-direction: row;
    }
}

/* --- Lanyard Trigger Styles --- */
.lanyard-container {
    position: fixed;
    top: 0;
    left: 5%;
    /* Moved to Left */
    z-index: 2000;
    filter: drop-shadow(0 10px 10px rgba(0, 0, 0, 0.5));
    cursor: grab;
    transform-origin: top center;
    /* Critical for pendulum swing */
    /* Add padding to create the "string" length and allow grabbing the wire */
    padding-top: 100px;
    padding-bottom: 20px;
}

.lanyard-container:active {
    cursor: grabbing;
}


/* Lanyard String (The Cord) */
.lanyard-string {
    width: 2px;
    height: calc(150vh + 100px);
    /* 150vh above + 100px visible */
    /* Ends exactly at the anchor point */
    background: rgba(255, 255, 255, 0.3);
    position: absolute;
    top: -150vh;
    /* Start far above, end at 100px (padding-top) */
    left: 50%;
    transform: translateX(-50%);
    box-shadow: 0 0 5px rgba(255, 255, 255, 0.2);
    z-index: -1;
    /* Ensure behind card */
    background: linear-gradient(to right, rgba(255, 255, 255, 0.1), rgba(255, 255, 255, 0.8), rgba(255, 255, 255, 0.1));
}

.lanyard-card {
    background: rgba(20, 20, 25, 0.9);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 10px;
    /* Padding for the card */
    border-radius: 10px;
    width: 120px;
    /* Width of the logo card */
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    /* top: -5px; Removed to let flow naturally after padding */
}

/* --- Menu Overlay Styles (Slide Down) --- */
.menu-overlay {
    position: fixed;
    inset: 0;
    background-color: var(--color-dark-forest);
    z-index: 1500;
    /* Behind the lanyard but above content */
    transform: translateY(-100%);
    /* Start hidden above */
    transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
    /* Ease-out quart-like */
    display: flex;
    flex-direction: column;
}

.menu-overlay.open {
    transform: translateY(0%);
}

.menu-header {
    padding: 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1010;
    /* Hide the header logo inside menu since we have the lanyard, 
        OR we can keep it as a branding reinforcement. 
        Let's keep it but maybe align it differently. */
}

/* Menu Navigation Links (Overlay) */
.menu-nav {
    /* Removed absolute positioning for flex centering */
    display: flex;
    flex-direction: column;
    gap: 2rem;
    text-align: center;
}

.menu-nav-item {
    font-family: var(--font-heading);
    color: rgba(255, 255, 255, 0.5);
    cursor: pointer;
    transition: all 0.3s;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.menu-nav-item:hover {
    color: var(--color-accent-green);
    transform: scale(1.1);
    /* Slight zoom instead of padding shift */
    letter-spacing: 0.2em;
    /* Expand text */
}

/* Removed Carousel Styles */