@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;800&display=swap');

:root {
    /* Dark Theme (Default) */
    --bg-color: #0f172a;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --card-hover: rgba(51, 65, 85, 0.8);
    --accent: #38bdf8;
    --accent-hover: #0284c7;
    --btn-bg: rgba(255, 255, 255, 0.1);
    --btn-hover: rgba(255, 255, 255, 0.2);
    --bg-image: url('https://nilsskr.de/background/2.png');
}

[data-theme="light"] {
    --bg-color: #f1f5f9;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(0, 0, 0, 0.1);
    --card-hover: rgba(241, 245, 249, 0.9);
    --accent: #0284c7;
    --accent-hover: #0369a1;
    --btn-bg: rgba(0, 0, 0, 0.05);
    --btn-hover: rgba(0, 0, 0, 0.1);
    --bg-image: none; /* No background image in light mode */
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    background-image: var(--bg-image);
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    color: var(--text-primary);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    transition: background-color 0.4s ease, color 0.4s ease;
    overflow-x: hidden;
}

/* Glassmorphism Container */
.glass-container {
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 3rem 4rem;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    text-align: center;
    max-width: 600px;
    width: 90%;
    transform: translateY(-20px);
    animation: fadeIn 0.8s ease-out forwards;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Profile Section */
.profile-section {
    margin-bottom: 2.5rem;
}

.profile-section h1 {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: 0.5rem;
    letter-spacing: -0.05em;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.subtitle {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

/* Links Grid */
.links-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
}

@media (max-width: 480px) {
    .links-grid {
        grid-template-columns: 1fr;
    }
}

.link-card {
    background: var(--btn-bg);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 1.5rem;
    text-decoration: none;
    color: var(--text-primary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
}

.link-card::before {
    content: '';
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255,255,255,0.05), transparent);
    transform: translateX(-100%);
    transition: transform 0.6s ease;
}

.link-card:hover::before {
    transform: translateX(100%);
}

.link-card:hover {
    background: var(--card-hover);
    transform: translateY(-5px);
    box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
    border-color: var(--accent);
}

.icon-wrapper {
    font-size: 2rem;
    color: var(--accent);
    transition: color 0.3s ease;
}

.link-card:hover .icon-wrapper {
    color: var(--accent-hover);
}

.link-card span {
    font-weight: 600;
    font-size: 0.95rem;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 2rem;
    right: 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    color: var(--text-primary);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 1.2rem;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 1000;
}

.theme-toggle:hover {
    background: var(--btn-hover);
    transform: rotate(15deg) scale(1.1);
}

/* Easter Egg Button */
.easter-egg-btn {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(8px);
    color: var(--text-primary);
    width: 45px;
    height: 45px;
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
}

.easter-egg-btn:hover {
    background: var(--btn-hover);
    transform: scale(1.1);
}

/* Popup */
.popup {
    position: fixed;
    bottom: 5rem;
    right: 2rem;
    background: var(--glass-bg);
    backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    padding: 1.5rem;
    border-radius: 16px;
    color: var(--text-primary);
    box-shadow: 0 10px 25px rgba(0,0,0,0.3);
    z-index: 1001;
    max-width: 280px;
    transition: opacity 0.3s ease, transform 0.3s ease;
}

.popup.hidden {
    opacity: 0;
    pointer-events: none;
    transform: translateY(10px);
}

.popup-content p {
    font-size: 0.9rem;
    line-height: 1.5;
    margin-bottom: 1rem;
}

.close-btn {
    background: var(--accent);
    color: #fff;
    border: none;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.3s ease;
    width: 100%;
}

.close-btn:hover {
    background: var(--accent-hover);
}

/* Footer */
footer {
    bottom: 1.5rem;
    text-align: center;
    color: var(--text-secondary);
    font-size: 0.75rem;
    width: 100%;
}

footer p {
    margin-top: 1rem;
}

.footer-credits {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.footer-credits img {
    height: 16px;
    opacity: 0.7;
}

.footer-credits a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-credits a:hover {
    color: var(--text-primary);
}