:root {
    --bg-color: #0d0f12;
    --surface-color: #17191e;
    --surface-hover: #21252d;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --accent-primary: #8b5cf6;
    --accent-secondary: #3b82f6;
    --danger: #ef4444;
    --success: #10b981;
    --border-color: rgba(255, 255, 255, 0.05);

    --font-main: 'Outfit', sans-serif;
    --font-weight-light: 200;
    --font-weight-regular: 300;
    --font-weight-medium: 400;
    --font-weight-bold: 500;
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-full: 9999px;

    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-primary);
    font-family: var(--font-main);
    display: flex;
    justify-content: center;
    height: 100vh;
    overflow: hidden;
    -webkit-font-smoothing: antialiased;
}

.app-container {
    width: 100%;
    max-width: 480px;
    padding: 24px 24px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

/* Header & Navigation */
.header {
    margin-bottom: 8px;
}

.date-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.date-titles {
    text-align: center;
}

.date-titles h1 {
    font-size: 21px;
    font-weight: var(--font-weight-medium);
    letter-spacing: -0.02em;
}

.date-titles .date {
    color: var(--text-secondary);
    font-size: 11px;
    margin-top: 4px;
}

.nav-btn {
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.nav-btn:hover:not(:disabled) {
    background: var(--surface-hover);
}

.nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Chart Section */
.chart-section {
    background: var(--surface-color);
    border-radius: var(--radius-md);
    padding: 24px 16px 12px 16px;
    border: 1px solid var(--border-color);
    position: relative;
    height: 160px;
    display: flex;
    flex-direction: column;
}

.chart-container {
    width: 100%;
    height: 100%;
    position: relative;
    display: flex;
    flex-direction: column;
}

.chart-goal-line {
    position: absolute;
    width: 100%;
    border-top: 2px dashed rgba(255, 255, 255, 0.1);
    top: 50%;
    /* Set by JS */
    left: 0;
    z-index: 1;
}

.chart-goal-label {
    position: absolute;
    bottom: 4px;
    left: 4px;
    font-size: 11px;
    color: var(--text-secondary);
    font-weight: var(--font-weight-medium);
}

#chart-maintenance-line {
    border-top: 2px solid rgba(255, 255, 255, 0.1);
}

.chart-plot-area {
    position: relative;
    width: 100%;
    flex: 1;
    display: flex;
    align-items: flex-end;
}

.chart-bars {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    height: 100%;
    width: 100%;
    gap: 8px;
    position: relative;
    z-index: 2;
}

.chart-col {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex: 1;
    height: 100%;
    justify-content: flex-end;
}

.chart-labels-row {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 8px;
    padding: 0 4px;
}

.chart-bar-wrapper {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    flex: 1;
}

.chart-bar {
    width: 100%;
    max-width: 24px;
    background: var(--surface-hover);
    border-radius: 4px 4px 0 0;
    transition: var(--transition);
}

.bar-diff-text {
    color: var(--text-secondary);
    font-size: 10px;
    font-weight: var(--font-weight-medium);
    margin-bottom: 6px;
    text-align: center;
}

.chart-bar.active {
    background: var(--accent-primary);
    box-shadow: 0 -2px 10px rgba(139, 92, 246, 0.3);
}

.chart-bar.over {
    background: var(--danger);
}

.chart-label {
    font-size: 12px;
    color: var(--text-secondary);
    text-align: center;
    flex: 1;
}

.chart-labels-row .chart-label {
    font-weight: var(--font-weight-regular);
}

/* Daily Progress Bar */
.progress-section {
    width: 100%;
}

.progress-bar-container {
    width: 100%;
    height: 12px;
    background-color: var(--surface-color);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
}

.progress-bar-fill {
    height: 100%;
    width: 0%;
    background: var(--accent-primary);
    border-radius: var(--radius-full);
    transition: width 0.8s cubic-bezier(0.34, 1.56, 0.64, 1);
    box-shadow: 0 0 10px rgba(139, 92, 246, 0.5);
}

/* Main Tracker */
.main-tracker-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    background: var(--surface-color);
    border-radius: var(--radius-lg);
    padding: 24px 16px;
    border: 1px solid var(--border-color);
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.tracker-center {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 110px;
}

.calories-current {
    font-size: 48px;
    font-weight: var(--font-weight-medium);
    line-height: 1;
    background: linear-gradient(135deg, var(--text-primary), var(--text-secondary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    margin-bottom: 8px;
    transition: var(--transition);
}

.editable-number {
    cursor: pointer;
}

.editable-number:hover {
    filter: brightness(1.2);
}

.main-tracker-section>.btn {
    flex-shrink: 0;
}

.outer-btn {
    margin: 0 0px;
}

.inner-btn {
    margin: 0 10px;
}

.btn-info {
    width: 18px;
    height: 18px;
    border-radius: var(--radius-full);
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--text-secondary);
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    font-family: var(--font-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-info:hover {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-primary);
}

.btn-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-full);
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.btn-icon:hover {
    background: var(--surface-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.2);
}

.btn-icon:active {
    transform: translateY(0);
}

.btn-icon-text {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-primary);
    font-weight: var(--font-weight-regular);
    font-size: 14px;
    font-family: var(--font-main);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
}

.btn-icon-text:hover {
    transform: translateY(-2px);
}

.btn-icon-text:active {
    transform: translateY(0);
    background-color: var(--surface-hover);
    border-color: var(--border-color);
}

/* Presets Section */
.presets-section {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.presets-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.presets-header h2 {
    font-size: 20px;
    font-weight: var(--font-weight-regular);
}

.btn-text {
    background: none;
    border: none;
    color: var(--accent-primary);
    font-family: var(--font-main);
    font-size: 14px;
    font-weight: var(--font-weight-regular);
    cursor: pointer;
    transition: var(--transition);
}

.btn-text:hover {
    color: #a78bfa;
}

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

.preset-card {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.preset-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.03), transparent);
    transform: translateX(-100%);
    transition: var(--transition);
}

.preset-card:hover {
    background-color: var(--surface-hover);
    border-color: rgba(255, 255, 255, 0.1);
    transform: translateY(-2px);
}

.preset-card:hover::before {
    transform: translateX(100%);
}

.preset-name {
    font-size: 15px;
    font-weight: var(--font-weight-regular);
}

.preset-cal {
    font-size: 14px;
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
}

.preset-delete {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    opacity: 1;
    position: absolute;
    right: 8px;
    top: 8px;
    padding: 4px;
    transition: var(--transition);
}

.preset-card:hover .preset-delete {
    opacity: 1;
}

.preset-delete:hover {
    color: var(--danger);
}

/* Modals */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 100;
}

.modal-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.modal-content {
    background-color: var(--surface-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    width: 90%;
    max-width: 320px;
    display: flex;
    flex-direction: column;
    gap: 16px;
    transform: translateY(20px);
    transition: var(--transition);
    box-shadow: 0 24px 48px rgba(0, 0, 0, 0.4);
}

.modal-overlay.active .modal-content {
    transform: translateY(0);
}

.modal-content h3 {
    font-size: 18px;
    font-weight: var(--font-weight-regular);
    margin-bottom: 8px;
}

.modal-input {
    width: 100%;
    background-color: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: var(--font-main);
    font-size: 16px;
    outline: none;
    transition: var(--transition);
}

.modal-input:focus {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(139, 92, 246, 0.2);
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    margin-top: 8px;
}

.btn {
    font-family: var(--font-main);
    font-size: 14px;
    font-weight: var(--font-weight-regular);
    padding: 10px 20px;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-secondary {
    background-color: transparent;
    color: var(--text-secondary);
}

.btn-secondary:hover {
    color: var(--text-primary);
    background-color: rgba(255, 255, 255, 0.05);
}

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

.btn-primary:hover {
    background-color: #7c3aed;
    box-shadow: 0 4px 12px rgba(139, 92, 246, 0.3);
}

/* Responsive adjustments */
@media (max-width: 480px) {
    .app-container {
        padding: 24px 16px;
        gap: 24px;
    }

    .main-tracker-section {
        padding: 24px 8px;
    }

    .btn-icon-text {
        width: 42px;
        height: 42px;
        font-size: 13px;
    }

    .outer-btn {
        margin: 0 0px;
    }

    .inner-btn {
        margin: 0 4px;
    }

    .calories-current {
        font-size: 52px;
    }
}

@media (max-width: 380px) {
    .app-container {
        padding: 16px 8px;
        gap: 20px;
    }

    .main-tracker-section {
        padding: 20px 4px;
    }

    .btn-icon-text {
        width: 38px;
        height: 40px;
        font-size: 12px;
        padding: 0;
    }

    .outer-btn {
        margin: 0 0px;
    }

    .inner-btn {
        margin: 0 2px;
    }

    .calories-current {
        font-size: 42px;
    }

    .btn-icon {
        width: 48px;
        height: 48px;
    }

    .date-titles h1 {
        font-size: 24px;
    }
}
/* Tabs & Bottom Nav */
.tab-pane {
    display: none;
    flex-direction: column;
    gap: 24px;
    animation: fadeIn 0.2s ease-out;
}

.tab-pane.active {
    display: flex;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(5px); }
    to { opacity: 1; transform: translateY(0); }
}

.bottom-nav {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    background: var(--surface-color);
    border-top: 1px solid var(--border-color);
    display: flex;
    justify-content: space-around;
    padding: 12px 16px;
    padding-bottom: max(12px, env(safe-area-inset-bottom));
    z-index: 100;
}

.bottom-nav-inner {
    width: 100%;
    max-width: 480px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
}

.nav-tab {
    background: none;
    border: none;
    color: var(--text-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    font-size: 11px;
    font-family: var(--font-main);
    cursor: pointer;
    transition: var(--transition);
}

.nav-tab.active {
    color: var(--text-primary);
}

.nav-tab.active svg {
    stroke: var(--accent-primary);
}

/* Weight and Lifts Helpers */
.chart-toggles {
    display: flex;
    background: var(--surface-hover);
    padding: 2px;
    border-radius: var(--radius-sm);
}

.chart-toggle {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 4px 10px;
    font-size: 12px;
    font-weight: var(--font-weight-medium);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: var(--transition);
}

.chart-toggle.active {
    background: var(--surface-color);
    color: var(--text-primary);
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

.ppl-toggles .btn {
    flex: 1;
}

.ppl-toggles .btn.active {
    background: var(--accent-primary);
    color: white;
    border-color: var(--accent-primary);
}

.lift-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    background: var(--surface-color);
    border: 1px solid var(--border-color);
    padding: 16px;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
}

.lift-item:hover {
    background: var(--surface-hover);
}

.lift-name {
    font-size: 16px;
    font-weight: var(--font-weight-medium);
}

.lift-meta {
    font-size: 13px;
    color: var(--text-secondary);
    margin-top: 4px;
}

.set-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background: var(--surface-hover);
    border-radius: var(--radius-sm);
    font-size: 14px;
}

.set-meta {
    display: flex;
    gap: 16px;
    color: var(--text-secondary);
}

.set-1rm {
    color: var(--accent-primary);
    font-weight: var(--font-weight-medium);
}

.btn-delete-set {
    background: none;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
}

.btn-delete-set:hover {
    color: var(--danger);
}