:root {
    --primary-color: #4a69ff;
    --primary-hover: #3856e0;
    --secondary-color: #6c757d;
    --background-color: #f1f5f9;
    --surface-color: #ffffff;
    --text-color: #1e293b;
    --text-muted: #64748b;
    --border-color: #e2e8f0;
    --font-family: 'Lato', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --box-shadow: 0 7px 25px rgba(0, 0, 0, 0.08);
    --border-radius: 16px;
    --transition-speed: 0.3s;
}

/* General Body Styles & Animations */
@keyframes fadeIn { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
body {
    font-family: var(--font-family);
    line-height: 1.7;
    margin: 0;
    background-color: var(--background-color);
    color: var(--text-color);
    animation: fadeIn 0.5s ease-out;
}

/* Header & Glassmorphism Navigation */
header {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    padding: 1rem 0;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
}
.container { max-width: 1200px; margin: 2rem auto; padding: 0 1.5rem; }
nav { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
nav .brand { font-size: 1.75rem; font-weight: 700; color: var(--primary-color); text-decoration: none; }
nav .nav-links a { color: var(--text-muted); text-decoration: none; margin-left: 1.5rem; font-weight: 700; transition: color var(--transition-speed) ease; }
nav .nav-links a:hover { color: var(--primary-hover); }

/* Hero Section */
.hero {
    background: linear-gradient(45deg, var(--primary-color), var(--primary-hover));
    color: #fff;
    padding: 6rem 1.5rem;
    text-align: center;
    border-radius: var(--border-radius);
    margin: 1rem;
    box-shadow: var(--box-shadow);
}
.hero h1 { font-size: 3.5rem; color: #fff; border: none; }
.hero p { font-size: 1.25rem; }

/* Forms & Inputs */
form { background: var(--surface-color); padding: 3rem; border-radius: var(--border-radius); box-shadow: var(--box-shadow); margin-top: 2rem; }
form div { margin-bottom: 1.5rem; }
form label { display: block; margin-bottom: .5rem; font-weight: 700; color: var(--text-muted); }
form input[type="text"],
form input[type="email"],
form input[type="password"],
form input[type="number"],
form select,
form textarea {
    width: 100%;
    padding: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-sizing: border-box;
    transition: all var(--transition-speed) ease;
    background-color: #f8f9fa;
    font-size: 1rem;
}
form input:focus, form select:focus, form textarea:focus {
    border-color: var(--primary-color);
    background-color: var(--surface-color);
    outline: 0;
    box-shadow: 0 0 0 4px rgba(74, 105, 255, 0.1);
}

#search {
    width: 100%;
    padding: 1.25rem;
    font-size: 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--border-radius);
    box-sizing: border-box;
    transition: all var(--transition-speed) ease;
}
#search:focus { border-color: var(--primary-color); box-shadow: 0 0 0 4px rgba(74, 105, 255, 0.1); }

/* Suggestions Dropdown */
.suggestions-dropdown {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: 0 0 var(--border-radius) var(--border-radius);
    box-shadow: var(--box-shadow);
    z-index: 1000;
}
.suggestions-dropdown div {
    padding: 1rem;
    cursor: pointer;
}
.suggestions-dropdown div:hover {
    background-color: var(--background-color);
}

/* Buttons with Icons */
.button, a.button {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.8rem 1.5rem;
    border: none;
    border-radius: 8px;
    background: var(--primary-color);
    color: white !important;
    font-size: 1rem;
    font-weight: 700;
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-speed) ease;
}
.button:hover, a.button:hover { background: var(--primary-hover); transform: translateY(-3px); box-shadow: 0 4px 12px rgba(0,0,0,0.15); }
.button svg { width: 20px; height: 20px; }

/* Card Layouts */
.card { background: var(--surface-color); padding: 2rem; border-radius: var(--border-radius); box-shadow: var(--box-shadow); margin-bottom: 1.5rem; transition: all var(--transition-speed) ease; }
.card:hover { transform: translateY(-5px); box-shadow: 0 12px 24px rgba(0,0,0,0.12); }
.card a { text-decoration: none; color: var(--primary-color); font-weight: 700; }

/* Piece & Score Lists Redesigned */
.piece-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 2rem; }
.piece-card { background: var(--surface-color); border-radius: var(--border-radius); box-shadow: var(--box-shadow); transition: all var(--transition-speed) ease; overflow: hidden; }
.piece-card:hover { transform: translateY(-5px); box-shadow: 0 12px 24px rgba(0,0,0,0.12); }
.piece-card-content { padding: 1.5rem; }
.piece-card h3 { margin-top: 0; }
.piece-card a { text-decoration: none; color: var(--primary-color); }
.piece-card .meta { font-size: 0.9rem; color: var(--text-muted); }

.score-list { list-style: none; padding: 0; }
.score-list li { display: flex; justify-content: space-between; align-items: center; padding: 1.5rem; background: var(--surface-color); border-radius: var(--border-radius); margin-bottom: 1rem; box-shadow: var(--box-shadow); transition: all var(--transition-speed) ease; }
.score-list li:hover { transform: scale(1.02); box-shadow: 0 12px 24px rgba(0,0,0,0.12); }
.score-list .instrument-info { display: flex; align-items: center; gap: 1rem; }
.score-list .instrument-info svg { color: var(--primary-color); }
.score-list .instrument { font-weight: 700; font-size: 1.1rem; }
.score-list .file-size { color: var(--text-muted); font-size: 0.9rem; }

/* Admin Layout Redesigned */
.admin-body { display: flex; }
.admin-container { display: flex; width: 100%; min-height: 100vh; }
.admin-sidebar { width: 260px; background: #1e293b; color: #f8f9fa; padding: 2rem; display: flex; flex-direction: column; }
.admin-sidebar .admin-brand a { color: #fff; text-decoration: none; font-size: 1.75rem; font-weight: 700; }
.admin-nav { display: flex; flex-direction: column; margin-top: 3rem; gap: 0.5rem; }
.admin-nav a { color: #cbd5e1; text-decoration: none; padding: 0.75rem 1rem; border-radius: 8px; transition: all var(--transition-speed) ease; display: flex; align-items: center; gap: 0.75rem; }
.admin-nav a:hover { background: #334155; color: #fff; }
.admin-content { flex: 1; padding: 3rem; background: var(--background-color); }
.dashboard-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: 2rem; }

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    margin-top: 2rem;
}
.pagination a {
    color: var(--primary-color);
    padding: 0.5rem 1rem;
    text-decoration: none;
    transition: background-color .3s;
    border: 1px solid var(--border-color);
    margin: 0 4px;
    border-radius: 4px;
}
.pagination a.active {
    background-color: var(--primary-color);
    color: white;
    border: 1px solid var(--primary-color);
}
.pagination a:hover:not(.active) {background-color: #ddd;}

/* Custom Upload Form */
.upload-form .form-section {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
.upload-form summary {
    padding: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    outline: none;
}
.upload-form .dynamic-inputs {
    padding: 0 1.5rem 1.5rem;
}
.upload-form .small-button {
    padding: 0.25rem 0.75rem;
    font-size: 0.8rem;
    margin-top: 1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
}