:root {
    /* Yarn Design System Variables */
    --ink: #1a1a1a;
    --ink-light: #4a4a4a;
    --ink-muted: #7a7a7a;
    --cream: #faf8f2;
    --cream-dark: #f0ece0;
    --white: #ffffff;
    --sage: #2d6a4f;
    --sage-dark: #1b4332;
    --sage-light: #52b788;
    --sage-pale: #d8f3dc;
    --gold: #c8952e;
    --gold-light: #faedcd;
    --gold-pale: #fdf6e3;
    --border: #e0dcd0;

    /* ARG Phase/Occult Layer Variables */
    --void-black: #0A0A0F;
    --deep-navy: #0F1420;
    --origin-gold: #D4A853;
    --thread-amber: #F5A623;
    --mystic-indigo: #2E0F5E;
    --hidden-violet: #4A1C6E;

    /* General Overrides for ARG */
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease, opacity 0.5s ease;
}

/* ================================================== */
/* Global Phase & Background Mechanics (Vignette/Body) */
/* ================================================== */

body {
    background-color: var(--cream);
    transition: background-color 0.5s ease, color 0.5s ease;
}

/* Body Transitions and Overrides */

/* Phase 2 */
body.phase-2::before {
    content: '';
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none;
    background: radial-gradient(circle at center, transparent 5%, rgba(15, 20, 32, 0.1) 40%, rgba(15, 20, 32, 0.6) 100%);
    opacity: 0; /* Starts hidden */
    transition: opacity 0.5s ease;
}
body.phase-2::before {
    opacity: 1;
}

/* Phase 3 */
body.phase-3::before {
    background: radial-gradient(circle at center, transparent 5%, rgba(15, 20, 32, 0.0) 40%, rgba(15, 20, 32, 0.7) 100%);
}

/* Phase 4 */
body.phase-4::before {
    background: radial-gradient(circle at center, transparent 5%, rgba(15, 20, 32, 0.0) 40%, rgba(15, 20, 32, 0.9) 100%);
}

/* Phase 5 */
body.phase-5 {
    background: var(--void-black);
    color: var(--origin-gold);
    font-family: monospace;
}

/* Site Header Overrides (General phase shifts) */
.site-header {
    transition: background-color 0.5s ease;
}
body.phase-3 .site-header {
    background-color: var(--deep-navy);
    border-bottom: 2px solid var(--origin-gold);
}

/* Buttons/Interactive elements (General phase shifts) */
button, a {
    transition: background-color 0.5s ease, color 0.5s ease, border-color 0.5s ease;
}
body.phase-3 button, body.phase-3 .btn {
    background-color: var(--sage); /* Default */
    border-color: var(--sage);
}
body.phase-3 button:hover, body.phase-3 .btn:hover {
    background-color: var(--origin-gold);
    border-color: var(--origin-gold);
}

/* ================================================== */
/* 1. Origin Point Dot */
/* ================================================== */

.origin-point {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 2px;
    height: 2px;
    background-color: var(--sage); /* Initial neutral color */
    border-radius: 50%;
    opacity: 0.1; /* Start invisible/neutral */
    pointer-events: none;
    z-index: 9999;
    transition: opacity 0.8s ease, box-shadow 0.8s ease;
}

/* Phase Overrides */
body.phase-1 .origin-point { opacity: 0.03; }
body.phase-2 .origin-point { opacity: 0.15; }
body.phase-3 .origin-point { opacity: 0.4; box-shadow: 0 0 5px var(--origin-gold); }
body.phase-4 .origin-point { opacity: 0.8; animation: origin-pulse 2s infinite linear; }
body.phase-5 .origin-point { opacity: 1; background-color: var(--origin-gold); box-shadow: 0 0 15px var(--origin-gold); }

/* ================================================== */
/* 2. Thread Pull Text Effect */
/* ================================================== */

.thread-pull {
    cursor: pointer;
    display: inline-block;
    padding: 2px 4px;
    color: var(--ink);
    background-color: var(--cream);
    transition: color 0.5s ease, background-color 0.5s ease;
}

/* Hover State (Always visible) */
.thread-pull:hover {
    text-decoration: none !important;
    box-shadow: none; /* Remove default underline if any */
}

/* Unraveling Class (JS added) - Active state */
.unraveling {
    color: var(--origin-gold);
    background-color: var(--void-black);
    border-bottom: 2px solid var(--thread-amber);
    transition: all 1s ease;
}

/* ================================================== */
/* 3. Hidden Void Text */
/* ================================================== */

.hidden-void-text {
    background-color: var(--cream) !important; /* Matches background, invisible */
    color: var(--cream); /* Invisible text color */
    cursor: help;
    display: inline-block;
    user-select: none;
}

/* Selection State (Browser native ::selection pseudo-element) */
.hidden-void-text::selection {
    background-color: var(--sage-pale);
    color: var(--mystic-indigo);
}

/* Revealed Class (JS added - Visible state) */
.revealed {
    color: var(--origin-gold);
    cursor: default;
    opacity: 1 !important;
    background-color: transparent !important;
    pointer-events: auto; /* Make it clickable/selectable again */
}

/* ================================================== */
/* 4. Orphaned Index Card Styling */
/* ================================================== */

.orphaned-index {
    border: 1px solid var(--border);
    padding: 20px;
    background-color: var(--cream-dark);
    box-shadow: 3px 3px 8px rgba(0, 0, 0, 0.05);
}

.orphaned-index .term {
    display: block;
    margin-top: 1em;
    font-weight: bold;
    color: var(--sage-dark);
}

/* Acrostic Highlight (Origin Gold Underline + Glow) */
.acrostic-highlight {
    position: relative;
    display: inline-block;
    text-decoration: none;
    padding-bottom: 2px; /* Space for the underline effect */
    color: var(--ink);
}

/* The actual glowing underline effect */
.acrostic-highlight::after {
    content: '';
    position: absolute;
    left: -50%;
    right: -50%;
    bottom: 0;
    height: 3px;
    background: linear-gradient(to right, transparent, var(--origin-gold), transparent);
    box-shadow: 0 0 8px rgba(212, 168, 83, 0.5); /* Subtle glow */
}

/* ================================================== */
/* 5. Dead Directory Link Styling */
/* ================================================== */

.dead-directory-link {
    color: var(--ink-muted);
    text-decoration: none;
    transition: color 0.5s ease, opacity 0.5s ease;
}

body.phase-3 .dead-directory-link {
    color: var(--origin-gold);
    opacity: 0.8;
}

/* ================================================== */
/* 6. Emerging Grid Overlay */
/* ================================================== */

.emerging-grid {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    pointer-events: none; /* Crucial: allows interaction underneath */
    z-index: 1000;
    background-image: repeating-linear-gradient(
        #ffffff 50% 0,
        transparent 50% 0
    ),
    repeating-linear-gradient(
        90deg,
        var(--origin-gold) 1px,
        transparent 1px
    );
    opacity: 0; /* Starts completely invisible */
    transition: opacity 0.5s ease;
}

/* Phase Overrides */
body.phase-2 .emerging-grid { opacity: 0.05; }
body.phase-3 .emerging-grid { opacity: 0.15; background-image: repeating-linear-gradient(var(--origin-gold) 1px, transparent 1px), repeating-linear-gradient(transparent 50% 0, var(--origin-gold) 50% 0); }
body.phase-4 .emerging-grid { opacity: 0.4; background-image: repeating-linear-gradient(rgba(212, 168, 83, 0.4) 1px, transparent 1px), repeating-linear-gradient(transparent 50% 0, rgba(212, 168, 83, 0.4) 50% 0); }
body.phase-5 .emerging-grid { opacity: 0.8; background-image: repeating-linear-gradient(var(--origin-gold) 1px, var(--origin-gold) 1px), repeating-linear-gradient(var(--origin-gold) 1px, var(--origin-gold) 1px); }

/* ================================================== */
/* 7. Terminal Overlay */
/* ================================================== */

.terminal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--void-black);
    color: var(--origin-gold);
    font-family: monospace;
    padding: 20px;
    box-sizing: border-box;
    z-index: 10000;
    opacity: 0; /* Starts hidden */
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

/* Active Class (JS added) - Visible state */
.terminal-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ================================================== */
/* 8. Password Modal Styling */
/* ================================================== */

.password-modal {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: var(--deep-navy);
    z-index: 11000; /* Above terminal overlay */
    opacity: 0; /* Starts hidden */
    visibility: hidden;
    transition: opacity 0.5s ease, visibility 0.5s ease;
}

/* Active Class (JS added) - Visible state */
.password-modal.active {
    opacity: 1;
    visibility: visible;
}

.password-modal .modal-content {
    background-color: var(--void-black);
    border: 3px solid var(--origin-gold);
    padding: 40px;
    text-align: center;
    box-shadow: 0 0 20px rgba(212, 168, 83, 0.5);
}

.password-modal input[type="text"], .password-modal input[type="password"] {
    background-color: var(--void-black);
    border: 1px solid var(--origin-gold);
    color: var(--origin-gold);
    font-family: monospace;
}

/* ================================================== */
/* KEYFRAMES DEFINITIONS */
/* ================================================== */

@keyframes origin-pulse {
    0%, 100% { transform: translate(-50%, -50%); opacity: 0.8; box-shadow: 0 0 10px var(--origin-gold); }
    50% { transform: translate(-50%, -50%) scale(2); opacity: 1; box-shadow: 0 0 20px var(--origin-gold); }
}

@keyframes text-glitch {
    /* Simple jitter effect for headings */
    0%, 100% { transform: translate(0, 0); opacity: 1; }
    25% { transform: translate(-1px, 1px); opacity: 0.9; }
    75% { transform: translate(1px, -1px); opacity: 0.8; }
}

@keyframes screen-tear {
    /* Horizontal displacement flicker */
    0%, 100% { clip-path: inset(0 0 0 0); }
    50% { clip-path: inset(0 2px 0 0); opacity: 0.8; transform: translateX(-1px); }
}

/* Apply glitch/tear effects to specific elements when phasing */
body.phase-4 h1, body.phase-4 h2, body.phase-4 p {
    animation: text-glitch 3s infinite alternate linear;
    display: inline-block; /* Required for clip-path usage on block elements */
}

body.phase-5 .terminal-overlay * {
    animation: screen-tear 0.1s steps(1) infinite;
}