:root {
    --bg-color: #f0f4f8; 
    --text-color: #1e293b;
    --btn-bg: #ffffff;
    --btn-hover: #e0f2fe; 
    --btn-border: #cbd5e1;
    --primary-blue: #0284c7;
    --secondary-text: #475569;
}

/* Dark Mode Variables */
body.dark-mode {
    --bg-color: #0f172a; 
    --text-color: #f8fafc;
    --btn-bg: #1e293b;
    --btn-hover: #334155; 
    --btn-border: #475569;
    --primary-blue: #38bdf8; 
    --secondary-text: #94a3b8;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    transition: background-color 0.3s ease, color 0.3s ease;
}

/* Theme Toggle Button */
.theme-toggle {
    position: absolute;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--btn-bg);
    border: 1px solid var(--btn-border);
    border-radius: 50%;
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.theme-toggle:hover {
    background-color: var(--btn-hover);
    transform: scale(1.05);
}

.theme-toggle img {
    width: 24px;
    height: 24px;
    /* CSS filter to make sure the black SVG turns white in dark mode */
    filter: invert(13%) sepia(18%) saturate(1832%) hue-rotate(185deg) brightness(96%) contrast(92%);
}

body.dark-mode .theme-toggle img {
    filter: invert(98%) sepia(4%) saturate(690%) hue-rotate(186deg) brightness(115%) contrast(96%);
}

.container {
    text-align: center;
    max-width: 400px;
    width: 90%;
    padding: 2rem;
}

/* Updated Header for side-by-side layout */
header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.logo {
    width: 150px; /* Increased from 60px to make it pop */
    height: auto;
    filter: drop-shadow(0 4px 6px rgba(0, 0, 0, 0.1)); 
}

h1 {
    font-size: 2rem; /* Bumped up slightly to match the larger logo */
    margin: 0;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.links-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

/* Base button styles applied to all buttons */
.link-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    text-decoration: none;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.2s ease;
}

.link-button img {
    width: 24px;
    height: 24px;
    /* Adapts SVG colors for light/dark mode */
    filter: invert(13%) sepia(18%) saturate(1832%) hue-rotate(185deg) brightness(96%) contrast(92%);
}

body.dark-mode .link-button img {
    filter: invert(98%) sepia(4%) saturate(690%) hue-rotate(186deg) brightness(115%) contrast(96%);
}

/* Primary Button Styles */
.link-button.primary {
    background-color: var(--btn-bg);
    color: var(--text-color);
    border: 1px solid var(--btn-border);
    box-shadow: 0 1px 3px rgba(0,0,0,0.05);
}

.link-button.primary:hover {
    background-color: var(--btn-hover);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
    transform: translateY(-2px);
    box-shadow: 0 4px 6px rgba(2, 132, 199, 0.15);
}

body.dark-mode .link-button.primary:hover img {
    filter: invert(66%) sepia(51%) saturate(3620%) hue-rotate(167deg) brightness(101%) contrast(98%);
}

/* Secondary Button Styles */
.link-button.secondary {
    background-color: transparent;
    color: var(--secondary-text);
    border: 1px dashed var(--btn-border);
}

.link-button.secondary:hover {
    background-color: rgba(2, 132, 199, 0.05);
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

body.dark-mode .link-button.secondary:hover {
    background-color: rgba(56, 189, 248, 0.1);
}

footer {
    margin-top: 2.5rem;
    font-size: 0.875rem;
    color: var(--secondary-text); 
}