:root {
    --bg-color: #f6f8fa;
    --card-bg: rgba(255, 255, 255, 0.65);
    --glass-border: rgba(0, 0, 0, 0.08);
    --text-primary: #1f2328;
    --text-secondary: #656d76;
    --accent-color: #0969da;
    --accent-glow: rgba(9, 105, 218, 0.2);
    --success-color: #1a7f37;
    --danger-color: #cf222e;
    --input-bg: rgba(255, 255, 255, 0.8);
    --font-main: 'Outfit', sans-serif;
}

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

body {
    font-family: var(--font-main);
    background-color: var(--bg-color);
    color: var(--text-primary);
    min-height: 100vh;
    background-image:
        radial-gradient(circle at 10% 20%, rgba(9, 105, 218, 0.05) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(26, 127, 55, 0.08) 0%, transparent 20%);
    display: flex;
    justify-content: center;
    padding: 2rem;
}

@media (max-width: 768px) {
    body {
        padding: 0.5rem;
    }

    .metrics-cards {
        grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
        gap: 0.8rem;
    }

    .metric {
        align-items: center;
        text-align: center;
    }

    .glass-card {
        padding: 1rem;
    }
}

.app-container {
    width: 100%;
    max-width: 1200px;
    display: flex;
    flex-direction: column;
    gap: 3rem;
}

/* Header */
.app-header {
    text-align: center;
    margin-bottom: 1rem;
}

.app-header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: -0.05em;
}

.app-header .highlight {
    color: var(--accent-color);
}

.app-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Glass Card */
.glass-card {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    padding: 1.5rem;
    box-shadow: 0 4px 24px -1px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    box-shadow: 0 8px 32px -1px rgba(0, 0, 0, 0.3);
}

/* Metrics */
.dashboard-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.metrics-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
}

.metric {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
}

.metric h3 {
    color: var(--text-secondary);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.5rem;
}

.metric p {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.metric span {
    font-size: 1rem;
    color: var(--text-secondary);
    font-weight: 400;
}

/* Chart */
.chart-container {
    width: 100%;
}

.canvas-wrapper {
    position: relative;
    height: 300px;
    width: 100%;
    overflow-x: auto;
    /* Enable horizontal scrolling */
    overflow-y: hidden;
    /* Custom scrollbar styling for this container */
    scrollbar-width: thin;
    scrollbar-color: rgba(0, 0, 0, 0.2) transparent;
}

.chart-scroll-inner {
    position: relative;
    height: 100%;
    /* Width will be set dynamically via JS */
    min-width: 100%;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-top: 1rem;
    flex-wrap: wrap;
}

.glass-btn {
    background: var(--card-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    padding: 1rem 2rem;
    border-radius: 25px;
    color: var(--text-primary);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.glass-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1);
    background: rgba(255, 255, 255, 0.8);
}

.circle-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 0;
}

.glass-btn.primary-btn {
    background: var(--accent-color);
    color: white;
    border: none;
}

.glass-btn.primary-btn:hover {
    background-color: #085ebd;
    /* Darker shade of accent */
    box-shadow: 0 8px 16px rgba(9, 105, 218, 0.3);
}

/* Modal Headers */
.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
}

.close-modal {
    font-size: 1.5rem;
    line-height: 1;
    padding: 0.5rem;
}

#weight-form,
#setup-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.input-row {
    display: flex;
    gap: 1rem;
}

.input-row .input-group {
    flex: 1;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.input-group label {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

input {
    background: transparent;
    border: none;
    border-bottom: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.8rem 0;
    font-size: 1rem;
    font-family: inherit;
    outline: none;
    transition: all 0.2s;
    border-radius: 0;
}

input:focus {
    border-bottom-color: var(--accent-color);
    box-shadow: 0 1px 0 0 var(--accent-color);
}

.btn-primary {
    background: var(--accent-color);
    color: #fff;
    border: none;
    padding: 1rem;
    border-radius: 25px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    margin-top: 0.5rem;
}

.form-actions {
    display: flex;
    gap: 1rem;
    margin-top: 0.5rem;
}

.form-actions .btn-primary {
    margin-top: 0;
    flex: 1;
}

.form-actions .btn-secondary {
    padding: 1rem;
    border-radius: 8px;
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    cursor: pointer;
    font-weight: 600;
    font-family: inherit;
    font-size: 1rem;
}

.form-actions .btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* History List */
.history-section {
    max-height: 400px;
    overflow-y: auto;
}

.history-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.8rem;
    background: rgba(0, 0, 0, 0.03);
    border-radius: 8px;
    border: 1px solid transparent;
    transition: all 0.2s;
}

.history-item:hover {
    border-color: var(--glass-border);
    background: rgba(0, 0, 0, 0.05);
}

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

.history-weight {
    font-weight: 600;
    color: var(--text-primary);
    margin-right: 1rem;
}

.action-btn {
    background: transparent;
    border: none;
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s, color 0.2s;
    font-size: 1.1rem;
    margin-left: 0.5rem;
    padding: 4px;
}

.action-btn:hover {
    opacity: 1;
}

.edit-btn {
    color: var(--accent-color);
}

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

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

/* Metric Header & Icon Btn */
.metric-header {
    display: flex;
    justify-content: space-between;
    width: 100%;
    align-items: center;
    margin-bottom: 0.5rem;
}

.metric-header h3 {
    margin-bottom: 0;
}

.icon-btn {
    background: transparent;
    border: none;
    font-size: 1.1rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity 0.2s;
    padding: 2px;
}

.icon-btn:hover {
    opacity: 1;
    transform: scale(1.1);
}

.metric-sub {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: -0.2rem;
}

/* Modal */
.glass-modal {
    background: var(--card-bg);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 25px;
    padding: 2rem;
    color: var(--text-primary);
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    margin: auto;
    max-width: 400px;
    width: 90%;
}

.glass-modal::backdrop {
    background: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
}

.glass-modal h3 {
    margin-bottom: 1.5rem;
    font-size: 1.5rem;
}

.modal-actions {
    display: flex;
    justify-content: flex-end;
    gap: 1rem;
    margin-top: 1.5rem;
}

.btn-secondary {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-primary);
    padding: 0.8rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
}

.btn-secondary:hover {
    background: rgba(0, 0, 0, 0.05);
}

/* Responsive: small screens show two metric cards per row */
@media (max-width: 480px) {
    .metrics-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.6rem;
    }

    .metric {
        align-items: center;
        text-align: center;
        padding: 0.6rem;
    }

    .glass-card {
        padding: 1rem;
        border-radius: 16px;
    }

    .metric p {
        font-size: 1.6rem;
    }

    .metric h3 {
        font-size: 0.8rem;
    }

    .canvas-wrapper {
        height: 220px;
    }

    .input-row {
        flex-direction: column;
        gap: 0.5rem;
    }

    .app-header h1 {
        font-size: 2rem;
    }

    .app-header p {
        font-size: 1rem;
    }

    #setup-form {
        gap: 0.8rem;
    }

    #setup-form .input-group {
        gap: 0.1rem;
    }

    #setup-form label {
        font-size: 0.8rem;
    }

    #setup-form input {
        padding: 0.6rem 0;
        font-size: 0.9rem;
    }

    #setup-form h3 {
        font-size: 1.2rem !important;
        margin-bottom: 1rem !important;
    }

    #setup-form .btn-primary {
        padding: 0.8rem;
        font-size: 0.9rem;
    }
}