/* ==========================================
   RESET & VARIABILI GLOBALI (Palette Eco-Tech)
   ========================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-color: #f7fbf9;
    --text-color: #1a2b22;
    --text-muted: #4a6355;
    --border-color: #d1e3d8;
    --header-bg: rgba(247, 251, 249, 0.85);
    --accent-color: #10b981;
    --accent-hover: #059669;
    --card-bg: #ffffff;
    --shadow-color: rgba(16, 185, 129, 0.08);
    --header-height: 60px;
}

[data-theme="dark"] {
    --bg-color: #0b110e;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: #1e2f25;
    --header-bg: rgba(11, 17, 14, 0.85);
    --accent-color: #34d399;
    --accent-hover: #10b981;
    --card-bg: #131e18;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    transition: background-color 0.4s ease, color 0.4s ease;
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */
.text-main {
    color: var(--text-color);
    transition: color 0.4s ease;
}

.text-muted {
    color: var(--text-muted);
    transition: color 0.4s ease;
}

/* ==========================================
   GLASS CARD
   ========================================== */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px var(--shadow-color);
    border-radius: 1rem;
    transition: background-color 0.4s ease, border-color 0.4s ease, box-shadow 0.4s ease;
}

/* ==========================================
   HEADER
   ========================================== */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: var(--header-height);
    background-color: var(--header-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    display: flex;
    align-items: center;
    padding: 0 5%;
    transition: all 0.3s ease;
}

.header-inner {
    max-width: 80rem;
    width: 100%;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.header-left {
    display: flex;
    justify-content: flex-start;
}

.header-center {
    position: absolute;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: 100%;
    max-width: 60%;
    pointer-events: none;
}

.header-center h1 {
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.025em;
    color: var(--text-color);
    transition: color 0.4s ease;
}

.header-center p {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.125rem;
    transition: color 0.4s ease;
}

@media (min-width: 768px) {
    .header-center h1 {
        font-size: 1.5rem;
    }
    .header-center p {
        font-size: 0.875rem;
    }
}

.header-right {
    display: flex;
    justify-content: flex-end;
}

/* ==========================================
   THEME BUTTON
   ========================================== */
.theme-btn {
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    cursor: pointer;
    width: 40px;
    height: 40px;
    color: var(--text-color);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px var(--shadow-color);
    text-decoration: none;
}

.theme-btn:hover {
    transform: translateY(-2px);
    border-color: var(--accent-color);
}

/* ==========================================
   MAIN CONTENT
   ========================================== */
main {
    padding-top: calc(var(--header-height) + 20px);
    padding-bottom: 1.5rem;
    max-width: 80rem;
    margin: 0 auto;
    padding-left: 1rem;
    padding-right: 1rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    main {
        padding-left: 2rem;
        padding-right: 2rem;
    }
}

/* ==========================================
   FILTER SECTION
   ========================================== */
.filters-card {
    padding: 1.5rem;
}

.filters-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .filters-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.filter-group-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-color);
    margin-bottom: 0.75rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.filter-group-title svg {
    width: 1rem;
    height: 1rem;
    flex-shrink: 0;
}

.filter-group-title .icon-blue  { color: #3b82f6; }
.filter-group-title .icon-green { color: #10b981; }
.filter-group-title .icon-purple{ color: #8b5cf6; }

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.filter-btn {
    transition: all 0.2s ease-in-out;
    border: 1px solid var(--border-color);
    background-color: var(--card-bg);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    font-family: 'Inter', sans-serif;
}

.filter-btn:hover {
    border-color: var(--accent-color);
    color: var(--text-color);
}

.filter-btn.active-output {
    background-color: #2563eb;
    color: white;
    border-color: #2563eb;
    box-shadow: 0 2px 4px rgba(37, 99, 235, 0.3);
}

.filter-btn.active-tempo {
    background-color: #10b981;
    color: white;
    border-color: #10b981;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

.filter-btn.active-tipo {
    background-color: #8b5cf6;
    color: white;
    border-color: #8b5cf6;
    box-shadow: 0 2px 4px rgba(139, 92, 246, 0.3);
}

.filter-btn.active-category {
    background-color: var(--text-color);
    color: var(--bg-color);
    border-color: var(--text-color);
}

/* category-toggle variant (slightly shorter pill) */
.category-toggle {
    padding: 0.375rem 1rem;
}

/* ==========================================
   STAT CARDS
   ========================================== */
.stats-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
}

@media (min-width: 768px) {
    .stats-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

.stat-card {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 1rem;
}

.stat-icon {
    width: 3rem;
    height: 3rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: background-color 0.3s, color 0.3s;
}

/* Icon colour schemes */
.stat-icon--blue   { background-color: #dbeafe; color: #2563eb; }
.stat-icon--green  { background-color: #d1fae5; color: #059669; }
.stat-icon--purple { background-color: #ede9fe; color: #7c3aed; }
.stat-icon--red    { background-color: #fee2e2; color: #dc2626; }
.stat-icon--gray   { background-color: #f1f5f9; color: #475569; }
.stat-icon--slate  { background-color: #e2e8f0; color: #475569; }
.stat-icon--yellow { background-color: #fef9c3; color: #ca8a04; }

[data-theme="dark"] .stat-icon--blue   { background-color: rgba(37,99,235,0.25);  color: #60a5fa; }
[data-theme="dark"] .stat-icon--green  { background-color: rgba(16,185,129,0.25); color: #34d399; }
[data-theme="dark"] .stat-icon--purple { background-color: rgba(124,58,237,0.25); color: #a78bfa; }
[data-theme="dark"] .stat-icon--red    { background-color: rgba(220,38,38,0.25);  color: #f87171; }
[data-theme="dark"] .stat-icon--gray   { background-color: rgba(100,116,139,0.25);color: #94a3b8; }
[data-theme="dark"] .stat-icon--slate  { background-color: rgba(71,85,105,0.5);   color: #cbd5e1; }
[data-theme="dark"] .stat-icon--yellow { background-color: rgba(202,138,4,0.25);  color: #facc15; }

.stat-label {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 500;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-color);
    transition: color 0.4s ease;
}

.stat-value--green { color: #10b981; }
.stat-value--red   { color: #ef4444; }
.stat-value--gray  { color: #64748b; }

/* ==========================================
   CHART SECTION
   ========================================== */
.chart-card {
    padding: 1.5rem;
}

.chart-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.chart-header h2 {
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--text-color);
}

.reload-btn {
    font-size: 0.875rem;
    color: #3b82f6;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    font-weight: 500;
    font-family: 'Inter', sans-serif;
    transition: color 0.2s;
}

.reload-btn:hover {
    color: #2563eb;
}

.reload-btn svg {
    width: 1rem;
    height: 1rem;
}

/* Category sub-filters */
.category-filters {
    display: none;
    flex-direction: column;
    gap: 1rem;
    margin-bottom: 1.5rem;
    padding-bottom: 1.25rem;
    border-bottom: 1px solid var(--border-color);
}

.category-filters.visible {
    display: flex;
}

@media (min-width: 640px) {
    .category-filters {
        flex-direction: row;
        align-items: center;
        justify-content: space-between;
    }
}

.category-filters-title {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-color);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.category-filters-title svg {
    width: 1rem;
    height: 1rem;
    color: #9ca3af;
}

.chart-canvas-wrapper {
    position: relative;
    height: 400px;
    width: 100%;
}