:root {
    --bg: #0d1117;
    --panel: #161b22;
    --card: #21262d;
    --line: #30363d;
    --line-strong: #484f58;
    --text: #c9d1d9;
    --text-soft: #8b949e;

    --cyan: #58a6ff;
    --orange: #d18616;
    --lime: #3fb950;
    --pink: #ff7b72;
    --purple: #8957e5;

    --radius-lg: 16px;
    --radius-md: 12px;
    --radius-sm:8px;

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.2);
    --shadow-ms: 0 4px 8px rgba(0,0,0,0.3);
    --transition: 0.3s ease;
}
body.light-theme {
    --bg: #f6f8fa;
    --panel: #ffffff;
    --card: #f3f4f6;
    --line: #d0d7de;
    --line-strong: #afb8c1;

    --text: #24292f;
    --text-soft: #57606a;

    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadoe-md: 0 4px 8px rgba(0,0,0,0.1);
}
* {
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    margin: 0;
    background-color: var(--bg);
    color: var(--text);
    font-family: "Outfit", sans-serif;
    min-height: 100vh;
}
a {
    text-decoration: none;
    color: inherit;
}
button, input, select, textarea {
    font-family: inherit;
}
button {
    background: none;
    border: none;
    cursor: pointer;
}
h1, h2, h3, h4 {
    font-family: "Space Grotest", sans-serif;
    margin: 0;
}
p {
    line-height: 1.5;
}
.eyebrow, .sidebar-label, .section-kicker, .stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--text-soft);
    margin-bottom: 5px;
}
.muted-text, .card-meta {
    color: var(--text-soft);
    font-size: 0.9rem;
}
.app-shell {
    display: flex;
    min-height: 100vh;
}
.sidebar {
    width: 280px;
    background-color: var(--panel);
    border-right: 1px solid var(--line);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
}
.main-panel {
    flex-grow: 1;
    padding: 30px;
    max-width: 1200px;
    margin: 0 auto;
}
.brand-block {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 40px;
}
.brand-mark {
    background-color: var(--cyan);
    color: #fff;
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: bold;
    font-size: 1.2rem;
}
.side-nav {
    display: flex;
    flex-direction: column;
    gap: 5px;
    margin-bottom: 40px;
}
.nav-link {
    padding: 12px 15px;
    border-radius: var(--radius-sm);
    color: var(--text-soft);
    transition: all var(--transition);
}
.nav-link:hover {
    background-color: rgba(255, 255, 255, 0.05);
    color: var(--text);
}
.nav-link.active {
    background-color: rgba(88, 166, 255, 0.1);
    color: var(--cyan);
    font-weight: 500;
}
body.light-theme .nav-link:hover {
    background-color: (0, 0, 0, 0.05);
}
.sidebar-card {
    background-color: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 20px;
}
.intensity-ring {
    background-color: rgba(0,0,0,0.2);
    width: 120px;
    height: 120px;
    border-radius: 50%;
    margin: 15px auto;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--purple);
}
.intensity-core {
    text-align: center;
}
.intensity-core strong {
    font-size: 1.5rem;
    display: block;
}
.row-between {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: var(--card);
    padding: 20px;
    border-radius: var(--radius-lg);
    margin-bottom: 30px;
    border: 1px solid var(--line);
}
.topbar-actions {
    display: flex;
    gap: 15px;
}
.secondary-button, .primary-button, .ghost-button {
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    transition: var(--transition);
}
.primary-button {
    background-color: var(--cyan);
    color: #000;
    font-weight: bold;
}
.primary-button:hover { background-color: #438be5;}
.secondary-button {
    background-color: rgba(88, 166, 255, 0.15);
    color: var(--cyan);
}
.secondary-button:hover { background-color: rgba(88, 166, 255, 0.25);}
.ghost-button {
    border: 1px solid var(--line-strong);
    color: var(--text);
}
.ghost-button {
    border: 1px solid var(--line-strong);
    color: var(--text);
}
.ghost-button:hover {
    background-color: rgba(255, 255, 255, 0.05);
}
body.light-theme .ghost-button:hover {
    background-color: rgba(0,0,0,0.05);
}
.subtle-danger {
    background-color: var(--pink);
    color: #fff;
}
.subtle-danger:hover { background-color: #d15651; }
.page-section {
    display: none;
    animation: fadeIn 0.3s ease;
}
.page-section.active {
    display: block;
}
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px);}
    to { opacity: 1; transform: translateY(0);}
}
.hero-panel {
    display: flex;
    background: linear-gradient(135deg, var(--panel), var(--card));
    border: 1px solid var(--line);
    border-radius: var(--radius-lg);
    padding: 40px;
    margin-bottom: 30px;
}
.hero-copy p {
    max-width: 60ch;
}
.hero-copy h3 {
    font-size: 2rem;
    margin: 10px 0;
}
.hero-pills, .inline-chips, .session-tags, .goal-meta-row, .session-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-top: 15px;
}
.pill, .head-chip, .tiny-chip, .mini-badge {
    background-color: rgba(0,0,0,0.2);
    padding: 6px 12px;
    border-radius: 30px;
    font-size: 0.85rem;
    border: 1px solid var(--line);
    color: var(--text-soft);
}
.tiny-chip.success, .mini-badge.success {
    border-color: var(--lime);
    color: var(--lime);
}
.mini-badge.highlight {
    border-color: var(--cyan);
    color: var(--cyan);
}
.mini-badge.warning {
    border-color: var(--orange);
    color: var(--orange);
}
.hero-visual {
    flex-grow: 1;
    display: flex;
    justify-content: flex-end;
}
.summary-stack {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.glass-card {
    background: var(--card);
    border: 1px solid var(--line);
    padding: 15px;
    border-radius: var(--radius-md);
}
.glass-card strong {
    font-size: 1.4rem;
}
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}
.dashboard-layout, .two-column-layout {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}
.three-column-layout {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-bottom: 30px;
}
.stat-card, .panel-card {
    background-color: var(--card);
    border: 1px solid var(--line);
    border-radius: var(--radius-md);
    padding: 24px;
}
.stat-card strong, .macro-card strong, .calculator-output strong, .session-card strong, .goal-card strong, .insight-card strong {
    display: block;
    font-size: 1.8rem;
    margin: 10px 0 5px;
}
.session-card strong, .goal-card strong, .insight-card strong {
    font-size: 1.2rem;
    margin: 0 0 5px 0;
}
.section-title-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.card-head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
}
.bar-chart {
    display: flex;
    align-items: flex-end;
    height: 200px;
    gap: 10px;
    margin-top: 20px;
}
.bar-chart__item {
    flex-grow: 1;
    text-align: center;
    display: flex;
    flex-direction: column;
    height: 100%;
}
.bar-chart__bar-wrap {
    flex-grow: 1;
    background-color: rgba(255, 255, 255, 0.05);
    border-radius: 4px;
    position: relative;
    display: flex;
    align-items: flex-end;
}
body.light-theme .bar-chart__bar-wrap { background-color: rgba(0,0,0,0.05); }
.bar-chart__bar {
    background-color: var(--cyan);
    width: 100%;
    border-radius: 4px;
}
.progress-ring-grid {
    display: flex;
    justify-content: space-between;
}
.ring-card {
    text-align: center;
    padding: 10px;
}
.progress-ring {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    background: conic-gradient(var(--cyan) var(--fill, 0%), var(--line) 0);
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 10px;
}
.progress-ring[data-ring="water"] { background: conic-gradient(var(--orange) var(--fill, 0%), var(--line) 0); }
.progress-ring[data-ring="protein"] { background: conic-gradient(var(--lime) var(--fill, 0%), var(--line) 0); }
.progress-ring__value {
    background-color: var(--card);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
}
.stack-list, .insight-card, .session-list, .timeline-list, .goal-list, .tip-stack, .chip-grid {
    display: flex;
    flex-direction: column;
    gap: 15px;
}
.chip-grid { flex-direction: row; flex-wrap: wrap; }
.list-card, .insight-card, .session-card, .timeline-card, .goal-card, .tip-card {
    background-color: var(--panel);
    border: 1px solid var(--line);
    padding: 15px;
    border-radius: var(--radius-sm);
}
.session-actions button, .goal-actions button {
    padding: 5px 10px;
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
    color: var(--text);
    margin-right: 5px;
}
.session-actions button:hover, .goal-actions button:hover {
    background-color: rgba(255, 255, 255, 0.05);
}
body.light-theme .session-actions button:hover { background-color: rgba(0,0,0,0.05); }
.form-grid {
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
}
.form-grid .full-width {
    grid-column: 1 / -1;
}
label {
    display: flex;
    flex-direction: column;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text-soft);
}
input, select, textarea {
    padding: 10px;
    background-color: var(--bg);
    border: 1px solid var(--line);
    color: var(--text);
    border-radius: var(--radius-sm);
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--cyan);
}
.macro-summary-grid {
    display: flex;
    justify-content: space-between;
    margin-top: 15px;
}
.macro-card {
    text-align: center;
}
.macro-bars {
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}
.macro-bars__track {
    background-color: var(--line);
    height: 10px;
    border-radius: 5px;
}
.macro-bars__fill {
    background-color: var(--cyan);
    height: 100%;
    border-radius: 5px;
}
.macro-bars__fill.protein { background-color: var(--lime); }
.macro-bars__fill.carbs { background-color: var(--cyan);}
.macro-bars__fill.fats { background-color: var(--orange);}
.hydration-meter {
    height: 200px;
    background-color: var(--line);
    border-radius: var(--radius-md);
    position: relative;
    overflow: hidden;
    margin-top: 20px;
}
.hydration-fill {
    position: absolute;
    bottom: 0;
    width: 100%;
    background-color: var(--cyan);
    transition: height 0.3s ease;
}
.hydration content {
    position: absolute;
    top: 0; left: 0; width: 100%; height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-shadow: 0 1px 3px rgba(0,0,0,0.05);
    color: #fff;
}
.goal-progress {
    height: 8px;
    background-color: var(--line);
    border-radius: 4px;
    margin: 10px 0;
}
.goal-progress__fill {
    height: 100%;
    background-color: var(--purple);
    border-radius: 4px;
    transition: width 0.3s ease;
}
.line-chart {
    display: flex;
    height: 150px;
    align-items: flex-end;
    gap: 10px;
    margin-top: 20px;
}
.line-chart__point-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
}
.line-chart__line {
    background-color: var(--cyan);
    width: 2px;
}
.line-chart__dot {
    width: 10px;
    height: 10px;
    background-color: var(--cyan);
    border-radius: 50%;
    margin-top: -5px;
}
.line-chart__value, .line-chart__label, .bar__value, .bar-chart__label {
    font-size: 0.85rem;
    color: var(--text-soft);
}
.calculator-output {
    margin-top: 20px;
    padding: 20px;
    background-color: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
}
.footer-note {
    margin-top: 30px;
    padding: 20px;
    background-color: var(--bg);
    border: 1px solid var(--line);
    border-radius: var(--radius-sm);
}
.empty-state {
    padding: 20px;
    text-align: center;
    color: var(--text-soft);
    border: 1px dashed var(--line-strong);
    border-radius: var(--radius-sm);
}
.toast-container {
    position: fixed;
    bottom: 20px;
    right: 20px;
    display: flex;
    flex-direction: column;
    gap: 10px;
    z-index: 100;
}
.toast {
    background-color: var(--panel);
    border: 1px solid var(--line);
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    box-shadow: var(--shadoe-md);
    min-width: 250px;
}
.toast.success { border-left: 4px solid var(--lime); }
.toast.error { border-left: 4px solid var(--pink); }
.quick-water-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 10px;
    margin: 20px 0;
}
.tip-stack p {
    margin-top: 5px;
}
.modal-overlay {
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: rgba(0,0,0,0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition);
    backdrop-filter: blur(4px);
}
.modal-overlay.active {
    opacity: 1;
    pointer-events: auto;
}
.modal-content {
    background-color: var(--card);
    border: 1px solid var(--line);
    padding: 30px;
    border-radius: var(--radius-lg);
    max-width: 400px;
    width: 90%;
    box-shadow: 0 10px 30px rgba(0,0,0,0.5);
    transform: translateY(20px);
    transition: transform var(--transition);
}
.modal-overlay.active .modal-content {
    transform: translateY(0);
}
.modal-content h3 {
    margin-bottom: 15px;
    font-size: 1.5rem;
}
.modal-content p {
    color: var(--text-soft);
    margin-bottom: 25px;
    line-height: 1.5;
}
.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 15px;
}
@media (max-width: 1024px) {
    .sidebar { width: 220px; }
    .stats-grid { grid-template-columns: repeat(2, 1fr); }
    .three-column-layout { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
    .app-shell { flex-direction: column; }
    .sidebar { width: 100%; height: auto; position: static; border-right: none; border-bottom: 1px solid var(--line); }
    .dashboard-layout, .two-column-layout, .three-column-layout, .stats-grid {
        grid-template-columns: 1fr;
    }    
}