:root {
    /* Brand Colors - Refined */
    --color-ep: #3da334;
    /* Deep rich green */
    --color-gp: #1e8cc7;
    /* Professional blue */
    --color-sp: #9b3ea8;
    /* Royal purple */
    --color-kit: #f49b25;
    /* Warm amber */
    --color-collection: #ffd700;
    /* Gold */

    /* UI Colors */
    --bg-main: #f8fafc;
    --bg-card: rgba(255, 255, 255, 0.7);
    --bg-sidebar: rgba(255, 255, 255, 0.8);

    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-accent: #2563eb;

    --border-light: rgba(255, 255, 255, 0.6);
    --border-strong: rgba(226, 232, 240, 0.8);

    /* Effects */
    --shadow-sm: 0 2px 4px rgba(148, 163, 184, 0.05);
    --shadow-md: 0 8px 16px -2px rgba(148, 163, 184, 0.1);
    --shadow-lg: 0 20px 25px -5px rgba(148, 163, 184, 0.1), 0 8px 10px -6px rgba(148, 163, 184, 0.05);
    --shadow-glow: 0 0 20px rgba(37, 99, 235, 0.15);

    --glass-blur: blur(16px);
    --transition-base: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg-main: #0f172a;
        /* Deep slate */
        --bg-card: rgba(30, 41, 59, 0.6);
        --bg-sidebar: rgba(15, 23, 42, 0.7);

        --text-primary: #f1f5f9;
        --text-secondary: #94a3b8;

        --border-light: rgba(255, 255, 255, 0.05);
        --border-strong: rgba(255, 255, 255, 0.1);

        --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
        --shadow-md: 0 8px 16px -2px rgba(0, 0, 0, 0.3);
        --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    }
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-main);
    color: var(--text-primary);
    line-height: 1.6;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(37, 99, 235, 0.05) 0%, transparent 40%),
        radial-gradient(circle at 90% 80%, rgba(244, 155, 37, 0.05) 0%, transparent 40%);
    background-attachment: fixed;
    overflow-x: hidden;
}

h1,
h2,
h3,
.pack-title {
    font-family: 'Outfit', 'Nunito', sans-serif;
    letter-spacing: -0.02em;
}

/* Header */
.app-header {
    background: var(--bg-card);
    padding: 1rem 2rem;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 1px solid var(--border-light);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: var(--shadow-sm);
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.plumbob {
    font-size: 2.2rem;
    filter: drop-shadow(0 0 10px rgba(76, 181, 60, 0.4));
    animation: float 3s ease-in-out infinite;
}

h1 {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text-primary);
}

.highlight {
    background: linear-gradient(135deg, var(--color-gp) 0%, var(--color-ep) 100%);
    background-clip: text;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    font-weight: 900;
}

/* Stat Item */
.stat-item {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    background: rgba(var(--color-ep), 0.05);
    padding: 0.5rem 1rem;
    border-radius: 12px;
    border: 1px solid var(--border-light);
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--color-ep);
    line-height: 1;
    font-family: 'Outfit', sans-serif;
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
}

/* Main Layout */
main {
    max-width: 1400px;
    margin: 2.5rem auto;
    padding: 0 1.5rem;
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 3rem;
}

/* Sidebar Controls */
.controls-sidebar {
    position: relative;
    height: 100%;
}

.sticky-container {
    position: sticky;
    top: 6.5rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--bg-sidebar);
    padding: 1.5rem;
    border-radius: 20px;
    border: 1px solid var(--border-light);
    box-shadow: var(--shadow-md);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
}

.search-box {
    position: relative;
}

#search-input {
    width: 100%;
    padding: 0.9rem 1rem 0.9rem 3rem;
    border-radius: 14px;
    border: 1px solid var(--border-strong);
    background: rgba(255, 255, 255, 0.5);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 0.95rem;
    transition: var(--transition-base);
}

#search-input::placeholder {
    color: var(--text-secondary);
    opacity: 0.7;
}

#search-input:focus {
    border-color: var(--color-gp);
    outline: none;
    box-shadow: 0 0 0 4px rgba(30, 140, 199, 0.15);
    background: #ffffff;
}

.search-icon {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    opacity: 0.6;
    pointer-events: none;
    font-size: 1.1rem;
}

.filter-group h3 {
    font-size: 0.8rem;
    color: var(--text-secondary);
    margin-bottom: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 700;
}

.filter-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    background: transparent;
    border: none;
}

.filter-btn {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 0.75rem 1rem;
    border-radius: 12px;
    border: 1px solid transparent;
    background: transparent;
    color: var(--text-secondary);
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-base);
    text-align: left;
    font-family: inherit;
}

.filter-btn:hover {
    background: rgba(255, 255, 255, 0.6);
    color: var(--text-primary);
    transform: translateX(4px);
}

.filter-btn.active {
    background: #ffffff;
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
    border-color: var(--border-light);
    transform: translateX(4px);
}

.filter-btn .dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    box-shadow: 0 0 8px currentColor;
}

.dot.ep {
    color: var(--color-ep);
    background-color: currentColor;
}

.dot.gp {
    color: var(--color-gp);
    background-color: currentColor;
}

.dot.sp {
    color: var(--color-sp);
    background-color: currentColor;
}

.dot.kit {
    color: var(--color-kit);
    background-color: currentColor;
}

.filter-btn.collection-btn {
    margin-top: 0.5rem;
    color: var(--color-collection);
    border: 1px dashed var(--color-collection);
    background: rgba(255, 215, 0, 0.05);
}

.filter-btn.collection-btn:hover {
    background: rgba(255, 215, 0, 0.15);
}

.filter-btn.collection-btn.active {
    background: var(--color-collection);
    color: #8a6d00;
    border-style: solid;
    box-shadow: var(--shadow-glow);
}

.sort-controls {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.75rem;
}

.sort-btn {
    padding: 0.75rem;
    border: 1px solid var(--border-strong);
    background: transparent;
    border-radius: 12px;
    cursor: pointer;
    font-family: inherit;
    font-weight: 600;
    color: var(--text-secondary);
    transition: var(--transition-base);
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
}

.sort-btn:hover {
    border-color: var(--text-secondary);
    color: var(--text-primary);
}

.sort-btn.active {
    background: var(--text-primary);
    color: var(--bg-card);
    border-color: var(--text-primary);
    box-shadow: var(--shadow-md);
}

/* Timeline */
.timeline-container {
    position: relative;
    padding-left: 2.5rem;
    border-left: 2px solid var(--border-strong);
}

.year-marker {
    position: relative;
    margin-bottom: 2rem;
}

.year-label {
    position: relative;
    left: -3.4rem;
    background: var(--text-primary);
    color: var(--bg-main);
    display: inline-block;
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    font-weight: 800;
    font-size: 1rem;
    font-family: 'Outfit', sans-serif;
    box-shadow: var(--shadow-lg);
    z-index: 10;
}

/* Pack Cards */
.pack-card {
    background: var(--bg-card);
    border-radius: 20px;
    padding: 2rem;
    margin-bottom: 2rem;
    box-shadow: var(--shadow-sm);
    position: relative;
    transition: var(--transition-base);
    border: 1px solid var(--border-light);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    cursor: default;
    overflow: hidden;
}

.pack-card:hover {
    transform: translateY(-5px) scale(1.01);
    box-shadow: var(--shadow-md);
    border-color: var(--border-strong);
}

/* Colored accent bar on left */
.pack-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 6px;
    height: 100%;
    opacity: 0.8;
}

.pack-card.ep::before {
    background-color: var(--color-ep);
}

.pack-card.gp::before {
    background-color: var(--color-gp);
}

.pack-card.sp::before {
    background-color: var(--color-sp);
}

.pack-card.kit::before {
    background-color: var(--color-kit);
}

/* Timeline Dot */
.pack-timeline-dot {
    position: absolute;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--bg-main);
    border: 4px solid var(--border-strong);
    left: -3rem;
    top: 2.5rem;
    z-index: 5;
    transition: var(--transition-base);
    box-shadow: 0 0 0 4px var(--bg-main);
}

.pack-card:hover+.pack-timeline-dot,
.pack-card.ep:hover .pack-timeline-dot {
    border-color: var(--color-ep);
    background: var(--color-ep);
}

.pack-card.gp:hover .pack-timeline-dot {
    border-color: var(--color-gp);
    background: var(--color-gp);
}

.pack-card.sp:hover .pack-timeline-dot {
    border-color: var(--color-sp);
    background: var(--color-sp);
}

.pack-card.kit:hover .pack-timeline-dot {
    border-color: var(--color-kit);
    background: var(--color-kit);
}

/* Pack Content */
.pack-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.pack-info {
    flex: 1;
}

.pack-type-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    letter-spacing: 0.5px;
    text-transform: uppercase;
}

.pack-card.ep .pack-type-badge {
    background: rgba(var(--color-ep), 0.1);
    color: var(--color-ep);
}

.pack-card.gp .pack-type-badge {
    background: rgba(var(--color-gp), 0.1);
    color: var(--color-gp);
}

.pack-card.sp .pack-type-badge {
    background: rgba(var(--color-sp), 0.1);
    color: var(--color-sp);
}

.pack-card.kit .pack-type-badge {
    background: rgba(var(--color-kit), 0.1);
    color: var(--color-kit);
}

.pack-title {
    font-size: 1.5rem;
    font-weight: 800;
    margin-bottom: 0.25rem;
    color: var(--text-primary);
}

.pack-date {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.pack-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 1.5rem;
}

/* Footer & Ownership */
.pack-footer {
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-light);
    display: flex;
    justify-content: flex-end;
}

.ownership-btn {
    background: transparent;
    border: 1px solid var(--border-strong);
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-secondary);
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    transition: var(--transition-base);
    font-family: inherit;
}

.ownership-btn:hover {
    background: var(--text-primary);
    border-color: var(--text-primary);
    color: var(--bg-card);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.ownership-btn.owned {
    background: rgba(255, 215, 0, 0.1);
    border-color: var(--color-collection);
    color: #e6c200;
}

.ownership-btn.owned:hover {
    background: var(--color-collection);
    color: #1a1a1a;
}

.ownership-btn:active {
    transform: scale(0.95);
}

.star-icon {
    font-size: 1.1rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 3rem;
    color: var(--text-secondary);
    font-size: 0.9rem;
    border-top: 1px solid var(--border-light);
    margin-top: 4rem;
}

/* Animations */
@keyframes float {

    0%,
    100% {
        transform: translateY(0);
    }

    50% {
        transform: translateY(-8px);
    }
}

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

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.pack-card {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out, box-shadow 0.3s ease, border-color 0.3s ease;
}

.pack-card.visible {
    opacity: 1;
    transform: translateY(0);
}

.pack-card:hover {
    transform: translateY(-5px) scale(1.01);
    box-shadow: var(--shadow-md);
    border-color: var(--border-strong);
}

main {
    grid-template-columns: 1fr;
    gap: 2rem;
}

.sticky-container {
    position: static;
    z-index: 10;
}

.filter-buttons {
    flex-direction: row;
    flex-wrap: wrap;
}

.filter-btn {
    flex: 1;
    justify-content: center;
}

.timeline-container {
    padding-left: 1.5rem;
}

.pack-timeline-dot {
    left: -2rem;
}

.year-label {
    left: -2.2rem;
}
}