:root {
    --bg: #1a1a2e;
    --surface: #16213e;
    --card: #0f3460;
    --accent: #e94560;
    --accent-hover: #ff6b81;
    --text: #eee;
    --text-dim: #94a3b8;
    --radius: 12px;
    --header-h: 100px;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    overflow-x: hidden;
}

#app { max-width: 800px; margin: 0 auto; padding-bottom: 40px; }

header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg);
    padding: 16px;
    border-bottom: 1px solid rgba(255,255,255,0.05);
}

header h1 {
    font-size: 1.4rem;
    margin-bottom: 12px;
    text-align: center;
}

nav {
    display: flex;
    gap: 8px;
    justify-content: center;
}

.nav-btn {
    padding: 8px 20px;
    border: none;
    border-radius: 20px;
    background: var(--surface);
    color: var(--text-dim);
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-btn.active {
    background: var(--accent);
    color: white;
}

main { padding: 16px; }

.view { display: none; }
.view.active { display: block; }

/* Search & Filters */
.search-bar { margin-bottom: 12px; }

.search-bar input {
    width: 100%;
    padding: 14px 18px;
    border: none;
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 1rem;
    outline: none;
}

.filters {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
}

.filters select {
    flex: 1;
    padding: 10px 12px;
    border: none;
    border-radius: var(--radius);
    background: var(--surface);
    color: var(--text);
    font-size: 0.85rem;
    outline: none;
    cursor: pointer;
}

/* Grid */
.grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 12px;
}

.exercise-card {
    background: var(--surface);
    border-radius: var(--radius);
    overflow: hidden;
    cursor: pointer;
    transition: transform 0.2s, box-shadow 0.2s;
}

.exercise-card:active {
    transform: scale(0.97);
}

.exercise-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    display: block;
}

.exercise-card .info {
    padding: 10px;
}

.exercise-card .name {
    font-size: 0.8rem;
    font-weight: 600;
    line-height: 1.3;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.exercise-card .meta {
    font-size: 0.7rem;
    color: var(--text-dim);
    margin-top: 4px;
}

/* Load More */
.load-more {
    text-align: center;
    margin-top: 20px;
}

.load-more button {
    padding: 12px 32px;
    border: none;
    border-radius: var(--radius);
    background: var(--card);
    color: var(--text);
    font-size: 0.9rem;
    cursor: pointer;
}

/* Workout View */
.workout-config {
    background: var(--surface);
    border-radius: var(--radius);
    padding: 20px;
    margin-bottom: 20px;
}

.workout-config h2 { margin-bottom: 16px; }

.muscle-chips {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 16px;
}

.chip {
    padding: 8px 14px;
    border-radius: 20px;
    background: var(--card);
    color: var(--text-dim);
    font-size: 0.8rem;
    cursor: pointer;
    border: 2px solid transparent;
    transition: all 0.2s;
}

.chip.selected {
    border-color: var(--accent);
    color: white;
    background: rgba(233, 69, 96, 0.2);
}

.workout-config label {
    display: block;
    margin-bottom: 16px;
    font-size: 0.85rem;
    color: var(--text-dim);
}

.workout-config input[type="number"] {
    width: 60px;
    padding: 6px 10px;
    border: none;
    border-radius: 8px;
    background: var(--card);
    color: var(--text);
    font-size: 1rem;
    margin-left: 8px;
    text-align: center;
}

.primary-btn {
    width: 100%;
    padding: 14px;
    border: none;
    border-radius: var(--radius);
    background: var(--accent);
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}

.primary-btn:hover { background: var(--accent-hover); }
.primary-btn.big { padding: 20px; font-size: 1.2rem; }

/* Workout Result */
.workout-group {
    margin-bottom: 24px;
}

.workout-group h3 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--accent);
    text-transform: capitalize;
}

/* Random View */
.random-container {
    text-align: center;
    padding-top: 20px;
}

.random-container h2 { margin-bottom: 24px; }

#random-result { margin-top: 24px; }

/* Modal */
.modal {
    position: fixed;
    inset: 0;
    z-index: 200;
    background: rgba(0,0,0,0.85);
    display: flex;
    align-items: flex-end;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.modal:not(.hidden) {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background: var(--surface);
    border-radius: 20px 20px 0 0;
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    padding: 20px;
    position: relative;
    transform: translateY(100%);
    transition: transform 0.3s;
}

.modal:not(.hidden) .modal-content {
    transform: translateY(0);
}

.close-btn {
    position: sticky;
    top: 0;
    float: right;
    background: none;
    border: none;
    color: var(--text);
    font-size: 2rem;
    cursor: pointer;
    line-height: 1;
    z-index: 10;
}

.modal img, .modal video {
    width: 100%;
    border-radius: var(--radius);
    margin-bottom: 16px;
}

.modal h2 { margin-bottom: 8px; font-size: 1.3rem; }

.modal .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 16px;
}

.modal .tag {
    padding: 4px 10px;
    border-radius: 12px;
    background: var(--card);
    font-size: 0.75rem;
    color: var(--text-dim);
}

.modal .instructions {
    line-height: 1.6;
    font-size: 0.9rem;
    color: var(--text-dim);
}

.modal .instructions li {
    margin-bottom: 8px;
    margin-left: 18px;
}

/* Responsive */
@media (min-width: 600px) {
    .grid { grid-template-columns: repeat(3, 1fr); }
}