/* --- BASE STYLES (Apply to all themes) --- */
body {
  font-family: 'Consolas', 'Courier New', monospace;
  text-align: center;
  margin: 0;
  padding: 10px;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  transition: background-color 0.2s, color 0.2s;

  background-color: var(--color-bg-primary);
  color: var(--color-text-main);
}

#container {
max-width: 500px;
width: 95%;
padding: 30px 20px;
background-color: var(--color-bg-secondary);
border: 1px solid var(--color-border-main);
border-radius: 0;
box-shadow: var(--shadow-container);
transition: background-color 0.2s, border-color 0.2s;
}

h1 {
  color: var(--color-text-title);
  margin-bottom: 5px;
  font-size: 2.5em;
  font-weight: 900;
  letter-spacing: 4px;
  text-shadow: var(--shadow-text);
  line-height: 1.1;
  text-transform: uppercase;
}

p {
  color: var(--color-text-sub);
  margin-bottom: 30px;
  font-size: 0.85em;
  letter-spacing: 1px;
  text-transform: uppercase;
}

hr {
  border: 0;
  border-top: 1px dashed var(--color-border-sub);
  margin: 30px 0;
}

/* --- BUTTON STYLES (Use variables) --- */

.social-link, .main-link-button {
  display: block;
  padding: 18px 20px;
  margin: 15px 0;
  text-decoration: none;
  font-size: 1.0em;
  font-weight: bold;
  text-transform: uppercase;

  color: var(--color-btn-text);
  background: var(--gradient-btn-base);

  border: 2px solid var(--color-btn-border);
  border-radius: 0;
  cursor: pointer;
  box-shadow: var(--shadow-btn-base);
  transition: all 0.05s linear;
}

.social-link:hover, .main-link-button:hover {
  background: var(--gradient-btn-hover);
  box-shadow: var(--shadow-btn-hover);
  transform: translate(-3px, -3px);
  border-color: var(--color-btn-border-hover);
}

#mode-toggle {
padding: 8px 15px;
margin-top: 30px;
cursor: pointer;
text-transform: uppercase;
font-size: 0.9em;

color: var(--color-toggle-text);
background: var(--color-toggle-bg);
border: 1px solid var(--color-toggle-border);
border-radius: 0;
font-weight: bold;
box-shadow: var(--shadow-toggle);
transition: all 0.1s linear;
}

#mode-toggle:hover {
background: var(--color-toggle-bg-hover);
color: var(--color-toggle-text-hover);
box-shadow: var(--shadow-toggle-hover);
}

/* ======================================= */
/* ====== 3. THEME DEFINITIONS HERE ====== */
/* ======================================= */


/* --- 1. THEME: CHROME BLACK (Your Aggressive Cybercore Default) --- */
.theme-chrome-black {
  /* Colors */
  --color-bg-primary: #000000;
  --color-bg-secondary: #0a0a0a;
  --color-text-main: #cccccc;
  --color-text-title: #ffffff;
  --color-text-sub: #888888;
  --color-border-main: #333333;
  --color-border-sub: #333333;

  /* Shadows */
  --shadow-container: 0 0 10px rgba(255, 255, 255, 0.1), inset 0 0 5px rgba(255, 255, 255, 0.05);
  --shadow-text: 0 0 3px #ffffff;

  /* Buttons (Chrome) */
  --color-btn-text: #000000;
  --color-btn-border: #555555;
  --color-btn-border-hover: #aaaaaa;
  --gradient-btn-base: linear-gradient(to bottom, #eeeeee 0%, #bbbbbb 100%);
  --gradient-btn-hover: linear-gradient(to bottom, #ffffff 0%, #dddddd 100%);
  --shadow-btn-base: 0 0 0 #000000, 4px 4px 0 #333333;
  --shadow-btn-hover: 0 0 0 #000000, 6px 6px 0 #555555;

  /* Toggle */
  --color-toggle-text: #ffffff;
  --color-toggle-bg: #000000;
  --color-toggle-border: #666666;
  --color-toggle-bg-hover: #111111;
  --color-toggle-text-hover: #ffffff;
  --shadow-toggle: 0 0 5px rgba(255, 255, 255, 0.2);
  --shadow-toggle-hover: 0 0 8px rgba(255, 255, 255, 0.4);
}


/* --- 2. THEME: SILVER CORE (Stark, Dark Silver) --- */
.theme-silver-core {
  /* Colors */
  --color-bg-primary: #1a1a1a;
  --color-bg-secondary: #333333;
  --color-text-main: #cccccc;
  --color-text-title: #f0f0f0;
  --color-text-sub: #aaaaaa;
  --color-border-main: #555555;
  --color-border-sub: #444444;

  /* Shadows */
  --shadow-container: 0 0 0 #000000;
  --shadow-text: none;

  /* Buttons (Bright Silver) */
  --color-btn-text: #111111;
  --color-btn-border: #888888;
  --color-btn-border-hover: #aaaaaa;
  --gradient-btn-base: linear-gradient(to bottom, #ffffff 0%, #dddddd 100%);
  --gradient-btn-hover: linear-gradient(to bottom, #eeeeee 0%, #bbbbbb 100%);
  --shadow-btn-base: 0 0 0 #000000, 4px 4px 0 #111111;
  --shadow-btn-hover: 0 0 0 #000000, 6px 6px 0 #222222;

  /* Toggle */
  --color-toggle-text: #f0f0f0;
  --color-toggle-bg: #333333;
  --color-toggle-border: #888888;
  --color-toggle-bg-hover: #555555;
  --color-toggle-text-hover: #ffffff;
  --shadow-toggle: 0 0 0 #000000;
  --shadow-toggle-hover: 0 0 5px rgba(255, 255, 255, 0.2);
}


/* --- 3. THEME: CYBER PURPLE (Black with Purple Accents) --- */
.theme-cyber-purple {
  /* Colors */
  --color-bg-primary: #000000;
  --color-bg-secondary: #0a001a; /* Very dark purple */
  --color-text-main: #dddddd;
  --color-text-title: #bb00ff; /* Purple Title */
  --color-text-sub: #aa55ff;
  --color-border-main: #5500aa;
  --color-border-sub: #220055;

  /* Shadows */
  --shadow-container: 0 0 10px rgba(187, 0, 255, 0.2), inset 0 0 5px rgba(187, 0, 255, 0.1);
  --shadow-text: 0 0 3px #bb00ff;

  /* Buttons (Chrome with Purple Shadow) */
  --color-btn-text: #000000;
  --color-btn-border: #555555;
  --color-btn-border-hover: #aaaaaa;
  --gradient-btn-base: linear-gradient(to bottom, #cccccc 0%, #888888 100%);
  --gradient-btn-hover: linear-gradient(to bottom, #ffffff 0%, #dddddd 100%);
  --shadow-btn-base: 0 0 0 #000000, 4px 4px 0 #7700cc; /* Purple Shadow */
  --shadow-btn-hover: 0 0 0 #000000, 6px 6px 0 #550099;

  /* Toggle */
  --color-toggle-text: #ffffff;
  --color-toggle-bg: #000000;
  --color-toggle-border: #bb00ff;
  --color-toggle-bg-hover: #5500aa;
  --color-toggle-text-hover: #ffffff;
  --shadow-toggle: 0 0 5px rgba(187, 0, 255, 0.4);
  --shadow-toggle-hover: 0 0 8px rgba(187, 0, 255, 0.7);
}


/* --- 4. THEME: ALT WHITE LIGHT (Pure White/Silver Light Mode) --- */
.theme-alt-white-light {
  /* Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f0f0f0;
  --color-text-main: #333333;
  --color-text-title: #111111;
  --color-text-sub: #555555;
  --color-border-main: #cccccc;
  --color-border-sub: #cccccc;

  /* Shadows */
  --shadow-container: 0 0 10px rgba(0, 0, 0, 0.1);
  --shadow-text: none;

  /* Buttons (Darker Chrome) */
  --color-btn-text: #000000;
  --color-btn-border: #aaaaaa;
  --color-btn-border-hover: #888888;
  --gradient-btn-base: linear-gradient(to bottom, #dddddd 0%, #aaaaaa 100%);
  --gradient-btn-hover: linear-gradient(to bottom, #ffffff 0%, #cccccc 100%);
  --shadow-btn-base: 0 0 0 #000000, 4px 4px 0 #cccccc;
  --shadow-btn-hover: 0 0 0 #000000, 6px 6px 0 #bbbbbb;

  /* Toggle */
  --color-toggle-text: #000000;
  --color-toggle-bg: #dddddd;
  --color-toggle-border: #000000;
  --color-toggle-bg-hover: #ffffff;
  --color-toggle-text-hover: #000000;
  --shadow-toggle: none;
  --shadow-toggle-hover: 0 0 5px rgba(0, 0, 0, 0.3);