:root {
    /* Light Mode (Default) */
    --brand-blue: #4fc3f7;
    --text-dark: #2c3e50;
    --text-light: #8ca0b3;
    --bg-primary: #f4f6f9;
    --bg-secondary: #FFFFFF;
    --border-color: #e1e8ed;
    --modal-shadow: 0 10px 30px rgba(0,0,0,0.2);
    --btn-dark: #2c3e50;
    --btn-dark-hover: #000;
}

body.dark-mode {
    /* Dark Mode */
    --text-dark: #e5e7eb;
    --text-light: #9ca3af;
    --bg-primary: #111827;
    --bg-secondary: #1f2937;
    --border-color: #374151;
    --modal-shadow: 0 10px 30px rgba(0,0,0,0.5);
    --btn-dark: #374151;
    --btn-dark-hover: #4b5563;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { 
    font-family: 'Poppins', sans-serif; 
    background-color: var(--bg-primary); 
    color: var(--text-dark); 
    transition: background-color 0.3s ease, color 0.3s ease;
}
.container { max-width: 1400px; margin: 0 auto; padding: 0 25px; }

/* HEADER */
.main-header { background-color: var(--bg-secondary); border-bottom: 1px solid var(--border-color); padding: 15px 25px; position: sticky; top: 0; z-index: 1000; transition: background-color 0.3s ease, border-color 0.3s ease; }
.header-content { display: flex; justify-content: space-between; align-items: center; }
.logo { display: flex; align-items: center; gap: 12px; font-family: 'Roboto Mono', monospace; font-size: 1.8rem; color: var(--text-dark); text-decoration: none; font-weight: 700; }

/* Theme Toggle Icon Button */
#theme-toggle {
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}
#theme-toggle:hover {
    background-color: var(--bg-primary);
}
#theme-toggle svg {
    width: 24px;
    height: 24px;
    stroke: var(--text-light);
    transition: stroke 0.2s ease;
}
#theme-toggle:hover svg {
    stroke: var(--brand-blue);
}

/* Logic to show the correct icon based on theme */
.icon-sun { display: none; }
.icon-moon { display: block; }
body.dark-mode .icon-sun { display: block; }
body.dark-mode .icon-moon { display: none; }


/* INTRO & STATS */
.intro-section { padding: 60px 0; text-align: center; background-color: var(--bg-secondary); transition: background-color 0.3s ease; }
.intro-content { max-width: 700px; margin: 0 auto 40px; }
.intro-content h1 { font-size: 2.8rem; margin-bottom: 1rem; color: var(--text-dark); }
.intro-content p { font-size: 1.1rem; color: var(--text-dark); line-height: 1.8; margin-bottom: 1.5rem; }

.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 20px; }
.stat-card { background-color: var(--bg-primary); padding: 25px; border-radius: 12px; border: 1px solid var(--border-color); transition: background-color 0.3s ease, border-color 0.3s ease;}
.stat-card-title { font-size: 1rem; color: var(--text-light); margin-bottom: 8px; font-weight: 600; }
.stat-card-value { font-family: 'Roboto Mono', monospace; font-size: 2.2rem; font-weight: 700; color: var(--text-dark); }

/* COLLECTION EXPLORER */
.explorer-section { padding: 50px 0; }
.section-title { font-size: 2.5rem; margin-bottom: 30px; text-align: center; color: var(--text-dark); }
.gallery-controls { text-align: center; margin-bottom: 40px; min-height: 50px; }
.gallery-status { color: var(--text-light); font-size: 1.2rem; margin-bottom: 15px; }
.reset-btn { font-family: 'Roboto Mono', monospace; font-weight: 700; font-size: 1rem; padding: 12px 30px; border-radius: 8px; background-color: var(--brand-blue); color: #FFFFFF; cursor: pointer; border: none; }

.nft-gallery { display: grid; grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); gap: 25px; }
.nft-card {
    border-radius: 16px; overflow: hidden; border: 2px solid var(--border-color);
    cursor: pointer; transition: border-color 0.2s ease;
}
.nft-card:hover { border-color: var(--brand-blue); }
.nft-card img { width: 100%; display: block; aspect-ratio: 1 / 1; background-color: #eee; }

/* TRAIT MODAL (ON CLICK) */
#trait-modal {
    display: none; position: fixed; z-index: 2000; width: 300px; background: var(--bg-secondary);
    border-radius: 12px; box-shadow: var(--modal-shadow); border: 1px solid var(--border-color);
    padding: 20px; transition: background-color 0.3s ease, border-color 0.3s ease;
}
#trait-modal img { width: 100%; border-radius: 8px; }
#trait-modal h4 { font-family: 'Roboto Mono', monospace; font-size: 1.4rem; margin: 15px 0; }
#trait-modal ul { list-style: none; padding: 0; margin-bottom: 15px; }
#trait-modal li { 
    display: flex; justify-content: space-between; font-size: 0.95rem; padding: 8px 10px; 
    border-radius: 6px; margin-top: 5px; background-color: var(--bg-primary);
    cursor: pointer; transition: background-color 0.2s ease, color 0.2s ease;
}
#trait-modal li:hover { background-color: var(--brand-blue); color: #FFFFFF; }
#trait-modal .trait-type { font-weight: 600; color: var(--text-light); }
#trait-modal .trait-value { color: var(--text-dark); }
#trait-modal li:hover .trait-type, #trait-modal li:hover .trait-value { color: #FFFFFF; }

.opensea-btn {
    display: block; width: 100%; padding: 12px; text-align: center; text-decoration: none;
    font-family: 'Roboto Mono', monospace; font-weight: 700; font-size: 1rem;
    background-color: var(--btn-dark); color: #FFFFFF; border-radius: 8px;
    transition: background-color 0.2s ease;
}
.opensea-btn:hover { background-color: var(--btn-dark-hover); }

.message-box { padding: 40px 20px; text-align: center; font-size: 1.2rem; color: var(--text-light); grid-column: 1 / -1; }
.error-message { color: #e74c3c; font-weight: 600; background-color: #fadbd8; border-radius: 8px; }
body.dark-mode .error-message { background-color: #5b2c28; }