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

:root {
    --bg: #0a0a0a;
    --surface: #111111;
    --surface-2: #1a1a1a;
    --surface-3: #141414;
    --border: #222222;
    --border-hover: #333333;
    --text: #f0f0f0;
    --text-muted: #888888;
    --text-dim: #555555;
    --accent: #b4f553;
    --accent-dim: rgba(180, 245, 83, 0.1);
    --accent-glow: rgba(180, 245, 83, 0.15);
    --accent-hover: #c8ff6d;
    --danger: #ff4444;
    --warning: #ffaa33;
}

html { scroll-behavior: smooth; }

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

/* NAV */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 100;
    padding: 1.25rem 2rem;
    background: rgba(10, 10, 10, 0.85);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border);
}
.nav-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--text);
    letter-spacing: -0.5px;
    text-decoration: none;
}
.logo span { color: var(--accent); }
.nav-right {
    display: flex;
    align-items: center;
    gap: 1rem;
}
.nav-user {
    font-size: 0.85rem;
    color: var(--text-muted);
}

/* BUTTONS */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.85rem 2rem;
    font-family: 'Space Grotesk', sans-serif;
    font-size: 0.95rem;
    font-weight: 600;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}
.btn-primary {
    background: var(--accent);
    color: #0a0a0a;
}
.btn-primary:hover {
    background: var(--accent-hover);
    transform: translateY(-1px);
}
.btn-primary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}
.btn-secondary {
    background: var(--surface);
    color: var(--text);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    border-color: var(--accent);
    background: var(--surface-2);
}
.btn-ghost {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.85rem;
    cursor: pointer;
    padding: 0.5rem;
    font-family: 'DM Sans', sans-serif;
}
.btn-ghost:hover { color: var(--text); }
.btn-small {
    padding: 0.5rem 1.25rem;
    font-size: 0.85rem;
}

/* CONTAINER */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 7rem 2rem 4rem;
}
.container-wide {
    max-width: 1200px;
    margin: 0 auto;
    padding: 7rem 2rem 4rem;
}

/* FORMS */
.form-group {
    margin-bottom: 1.5rem;
}
.form-label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--text-muted);
    margin-bottom: 0.5rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}
.form-input {
    width: 100%;
    padding: 0.9rem 1.2rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    color: var(--text);
    font-size: 1rem;
    font-family: 'DM Sans', sans-serif;
    transition: border-color 0.2s;
}
.form-input:focus {
    outline: none;
    border-color: var(--accent);
}
.form-input::placeholder { color: var(--text-dim); }
textarea.form-input {
    min-height: 80px;
    resize: vertical;
}

/* CARDS */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    transition: border-color 0.3s;
}
.card:hover {
    border-color: var(--border-hover);
}
.card-selected {
    border-color: var(--accent) !important;
    background: var(--accent-dim);
}

/* SELECTION CARDS */
.selection-grid {
    display: grid;
    gap: 1rem;
}
.selection-grid-2 { grid-template-columns: 1fr 1fr; }
.selection-grid-3 { grid-template-columns: repeat(3, 1fr); }
.selection-grid-4 { grid-template-columns: repeat(2, 1fr); }

.selection-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 16px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}
.selection-card:hover {
    border-color: var(--border-hover);
    background: var(--surface-2);
}
.selection-card.selected {
    border-color: var(--accent);
    background: var(--accent-dim);
}
.selection-card .card-icon {
    font-size: 2rem;
    margin-bottom: 0.75rem;
    display: block;
}
.selection-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}
.selection-card p {
    font-size: 0.85rem;
    color: var(--text-muted);
    line-height: 1.5;
}

/* CHECKBOX CARDS (Equipment) */
.checkbox-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75rem;
}
.checkbox-card {
    background: var(--surface);
    border: 2px solid var(--border);
    border-radius: 12px;
    padding: 1rem 1.25rem;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: 0.75rem;
}
.checkbox-card:hover {
    border-color: var(--border-hover);
}
.checkbox-card.selected {
    border-color: var(--accent);
    background: var(--accent-dim);
}
.checkbox-card .check {
    width: 20px;
    height: 20px;
    border: 2px solid var(--border);
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s;
    font-size: 0.7rem;
}
.checkbox-card.selected .check {
    background: var(--accent);
    border-color: var(--accent);
    color: #0a0a0a;
}
.checkbox-card span {
    font-size: 0.95rem;
}

/* ONBOARDING */
.onboarding {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 7rem 2rem 4rem;
}
.onboarding-card {
    max-width: 650px;
    width: 100%;
}
.step-indicator {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 2.5rem;
    justify-content: center;
}
.step-dot {
    width: 40px;
    height: 4px;
    border-radius: 2px;
    background: var(--border);
    transition: background 0.3s;
}
.step-dot.active {
    background: var(--accent);
}
.step-dot.completed {
    background: var(--accent);
    opacity: 0.5;
}
.onboarding-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2rem;
    font-weight: 700;
    letter-spacing: -1px;
    margin-bottom: 0.75rem;
    text-align: center;
}
.onboarding-subtitle {
    color: var(--text-muted);
    text-align: center;
    margin-bottom: 2.5rem;
    font-size: 1.05rem;
}
.onboarding-actions {
    display: flex;
    justify-content: space-between;
    margin-top: 2.5rem;
    gap: 1rem;
}

/* SLIDER */
.slider-container {
    padding: 1rem 0;
}
.slider-value {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 3rem;
    font-weight: 700;
    color: var(--accent);
    text-align: center;
    margin-bottom: 1rem;
}
.slider-label-text {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
    margin-top: 0.5rem;
}
input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--border);
    border-radius: 3px;
    outline: none;
}
input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg);
}
input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: var(--accent);
    cursor: pointer;
    border: 3px solid var(--bg);
}

/* DASHBOARD */
.dash-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 2.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}
.dash-title {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: -1px;
}
.dash-subtitle {
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-size: 1rem;
}
.dash-meta {
    display: flex;
    gap: 1.5rem;
    align-items: center;
}
.meta-tag {
    font-size: 0.8rem;
    padding: 0.4rem 1rem;
    border-radius: 100px;
    font-weight: 500;
}
.meta-tag-accent {
    background: var(--accent-dim);
    color: var(--accent);
}
.meta-tag-muted {
    background: var(--surface-2);
    color: var(--text-muted);
    border: 1px solid var(--border);
}

/* WORKOUT DAY CARDS */
.days-grid {
    display: grid;
    gap: 1rem;
}
.day-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    overflow: hidden;
    transition: border-color 0.3s;
}
.day-card:hover {
    border-color: var(--accent);
}
.day-header {
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    user-select: none;
}
.day-info h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}
.day-info p {
    font-size: 0.85rem;
    color: var(--text-muted);
}
.day-toggle {
    font-size: 1.5rem;
    color: var(--text-muted);
    transition: transform 0.3s;
}
.day-toggle.open {
    transform: rotate(180deg);
}
.day-content {
    display: none;
    border-top: 1px solid var(--border);
    padding: 1.5rem 2rem;
}
.day-content.open {
    display: block;
}
.day-section {
    margin-bottom: 1.5rem;
}
.day-section:last-child {
    margin-bottom: 0;
}
.day-section-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1.5px;
    color: var(--accent);
    font-weight: 600;
    margin-bottom: 0.75rem;
}

/* EXERCISE TABLE */
.exercise-table {
    width: 100%;
    border-collapse: collapse;
}
.exercise-table th {
    text-align: left;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: var(--text-dim);
    padding: 0.5rem 0;
    border-bottom: 1px solid var(--border);
    font-weight: 500;
}
.exercise-table td {
    padding: 0.85rem 0;
    border-bottom: 1px solid rgba(34, 34, 34, 0.5);
    vertical-align: top;
}
.exercise-table tr:last-child td {
    border-bottom: none;
}
.exercise-name {
    font-weight: 600;
    font-size: 0.95rem;
}
.exercise-detail {
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 500;
    color: var(--accent);
    font-size: 0.95rem;
}
.exercise-notes {
    font-size: 0.8rem;
    color: var(--text-muted);
    line-height: 1.5;
    max-width: 300px;
}
.warmup-text, .cooldown-text {
    font-size: 0.9rem;
    color: var(--text-muted);
    line-height: 1.6;
    padding: 0.75rem 1rem;
    background: var(--surface-2);
    border-radius: 8px;
}

/* PROGRESSION NOTES */
.progression-card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 16px;
    padding: 2rem;
    margin-top: 1.5rem;
}
.progression-card h3 {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--accent);
}
.progression-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
    margin-bottom: 0.75rem;
}

/* LOADING */
.loading-screen {
    min-height: 80vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 2rem;
}
.loading-icon {
    width: 64px;
    height: 64px;
    border: 3px solid var(--border);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 2rem;
}
@keyframes spin {
    to { transform: rotate(360deg); }
}
.loading-text {
    font-family: 'Space Grotesk', sans-serif;
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}
.loading-sub {
    color: var(--text-muted);
    font-size: 0.95rem;
    max-width: 400px;
}
.loading-tips {
    margin-top: 2rem;
    padding: 1.25rem 1.75rem;
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    max-width: 450px;
}
.loading-tips p {
    color: var(--text-muted);
    font-size: 0.85rem;
    line-height: 1.6;
}
.loading-tips .tip-icon {
    color: var(--accent);
    margin-right: 0.5rem;
}

/* ERROR */
.error-banner {
    background: rgba(255, 68, 68, 0.1);
    border: 1px solid rgba(255, 68, 68, 0.3);
    border-radius: 12px;
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    color: var(--danger);
    font-size: 0.9rem;
}

/* MOBILE */
@media (max-width: 768px) {
    nav { padding: 1rem 1.25rem; }
    .container { padding: 6rem 1.25rem 3rem; }
    .container-wide { padding: 6rem 1.25rem 3rem; }
    .onboarding { padding: 6rem 1.25rem 3rem; }
    .selection-grid-2, .selection-grid-3 { grid-template-columns: 1fr; }
    .selection-grid-4 { grid-template-columns: 1fr; }
    .checkbox-grid { grid-template-columns: 1fr 1fr; }
    .onboarding-title { font-size: 1.6rem; }
    .dash-title { font-size: 1.6rem; }
    .exercise-table { font-size: 0.85rem; }
    .exercise-notes { max-width: 180px; }
    .day-header { padding: 1.25rem 1.5rem; }
    .day-content { padding: 1.25rem 1.5rem; }
    .onboarding-actions { flex-direction: column-reverse; }
    .onboarding-actions .btn { width: 100%; }
}

@media (max-width: 480px) {
    .checkbox-grid { grid-template-columns: 1fr; }
}