:root {
    --bg-dark: #0f172a;
    --bg-card: rgba(30, 41, 59, 0.7);
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --accent-green: #10b981;
    --accent-green-hover: #059669;
    --border-color: rgba(255, 255, 255, 0.1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(16, 185, 129, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(16, 185, 129, 0.08), transparent 25%);
}

/* Header & Nav */
header {
    background: transparent;
    border-bottom: none;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

nav {
    display: flex;
    gap: 1rem;
}

.nav-btn {
    background: transparent;
    border: none;
    color: var(--text-muted);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    padding: 0.5rem 1rem;
    border-radius: 8px;
    transition: all 0.2s ease;
}

.nav-btn:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-btn.active {
    color: var(--accent-green);
    background: rgba(16, 185, 129, 0.1);
}

/* Main Content */
main {
    max-width: 1000px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.view-section {
    display: none;
    animation: fadeIn 0.3s ease;
}

.view-section.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

h2 {
    font-size: 2rem;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

/* Glass Panels */
.glass-panel {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
}

/* Forms */
.form-group {
    margin-bottom: 1.5rem;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--text-muted);
}

input, select {
    width: 100%;
    padding: 0.75rem 1rem;
    background: rgba(15, 23, 42, 0.5);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-main);
    font-size: 1rem;
    font-family: inherit;
    transition: border-color 0.2s;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--accent-green);
    box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
}

.btn-primary {
    background: var(--accent-green);
    color: #fff;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    width: 100%;
    transition: background-color 0.2s, transform 0.1s;
}

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

.btn-primary:active {
    transform: scale(0.98);
}

/* Dashboard Stats */
.stats-overview {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
}

.stat-card h3 {
    color: var(--text-muted);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.stat-card p {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-green);
}

/* Table */
.table-container {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    text-align: left;
}

th, td {
    padding: 1rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

th {
    background: rgba(0, 0, 0, 0.2);
    font-weight: 600;
    color: var(--text-muted);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

tbody tr:last-child td {
    border-bottom: none;
}

/* Recommender Result */
.result-box {
    margin-top: 2rem;
    padding: 1.5rem;
    background: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--accent-green);
    border-radius: 12px;
    text-align: center;
}

.result-box.hidden {
    display: none;
}

.highlight {
    color: var(--accent-green);
    font-size: 2rem;
    display: block;
    margin: 0.5rem 0;
}

/* Yardages Grid */
.yardage-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.yardage-card {
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    backdrop-filter: blur(10px);
    transition: transform 0.2s, background 0.2s;
}

.yardage-card:hover {
    transform: translateY(-5px);
    background: rgba(15, 23, 42, 0.8);
}

.yardage-card h3 {
    font-size: 1.2rem;
    color: var(--primary-color);
    margin-bottom: 1rem;
    border-bottom: 1px solid rgba(255,255,255,0.1);
    padding-bottom: 0.5rem;
}

.yardage-card .distance {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-main);
    margin-bottom: 0.5rem;
}

.yardage-card .distance span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--text-muted);
}

.yardage-card .stats-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* Responsive */
@media (max-width: 600px) {
    body, html {
        overflow-x: hidden;
        width: 100%;
    }
    header {
        flex-direction: column;
        gap: 1rem;
        padding: 1rem 0; /* Remove side padding to allow edge-to-edge nav scroll */
        width: 100%;
    }
    .logo {
        padding: 0 1rem;
        justify-content: center;
        width: 100%;
    }
    nav {
        width: 100%;
        justify-content: flex-start;
        overflow-x: auto;
        padding: 0 1rem 0.5rem 1rem;
        -webkit-overflow-scrolling: touch;
        gap: 0.5rem;
    }
    /* Hide scrollbar for a cleaner mobile app feel */
    nav::-webkit-scrollbar {
        display: none;
    }
    nav {
        -ms-overflow-style: none;
        scrollbar-width: none;
    }
    .nav-btn {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
        white-space: nowrap;
        flex-shrink: 0;
    }
    nav button#logout-btn {
        margin-left: 0.5rem !important;
        flex-shrink: 0;
        white-space: nowrap;
        font-size: 0.85rem;
        padding: 0.5rem 0.75rem !important;
    }
    main {
        margin: 1rem auto;
        padding: 0 0.5rem;
    }
    .glass-panel {
        padding: 1.5rem 1rem;
    }
    .stats-overview {
        gap: 1rem;
    }
    .table-container {
        width: 100%;
        max-width: calc(100vw - 1rem); /* Account for main padding */
    }
    .result-box {
        padding: 1rem;
    }
    .highlight {
        font-size: 1.5rem;
    }
}