/* ===================== CSS VARIABLES / DESIGN TOKENS ===================== */
:root {
    /* Colors - Light Mode */
    --color-background: #f8fafc;
    --color-surface: #ffffff;
    --color-surface-elevated: #f1f5f9;
    --color-border: #e2e8f0;
    --color-border-subtle: #f1f5f9;

    /* Text */
    --color-text-primary: #0f172a;
    --color-text-secondary: #475569;
    --color-text-muted: #94a3b8;

    /* Accent - Teal */
    --color-accent: #0d9488;
    --color-accent-hover: #0f766e;
    --color-accent-subtle: rgba(13, 148, 136, 0.1);

    /* Status Colors */
    --color-danger: #dc2626;
    --color-danger-subtle: rgba(220, 38, 38, 0.1);
    --color-warning: #ca8a04;
    --color-warning-subtle: rgba(202, 138, 4, 0.1);
    --color-success: #16a34a;

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

    /* Typography */
    --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'SF Mono', SFMono-Regular, ui-monospace, Menlo, Monaco, monospace;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
}

/* ===================== RESET & BASE STYLES ===================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-sans);
    background-color: var(--color-background);
    color: var(--color-text-primary);
    line-height: 1.5;
    min-height: 100vh;
}

/* ===================== UTILITIES ===================== */
.hidden {
    display: none !important;
}

.no-scroll {
    overflow: hidden !important;
}

/* ===================== BUTTONS ===================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: 1px solid transparent;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background-color: var(--color-accent);
    color: #ffffff;
    border-color: var(--color-accent);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
}

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

.btn-ghost:hover:not(:disabled) {
    background-color: var(--color-surface-elevated);
    color: var(--color-text-primary);
}

.btn-danger {
    background-color: transparent;
    color: var(--color-danger);
    border-color: var(--color-border);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--color-danger-subtle);
    border-color: var(--color-danger);
}

.btn-full {
    width: 100%;
}

.btn-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    padding: 0;
    background: transparent;
    border: none;
    border-radius: var(--radius-md);
    color: var(--color-text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.btn-icon:hover {
    background-color: var(--color-surface-elevated);
    color: var(--color-text-primary);
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

/* ===================== FORM ELEMENTS ===================== */
.form-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    flex: 1;
}

.form-group label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-text-secondary);
}

.form-group .required {
    color: var(--color-danger);
}

.form-row {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

input,
select,
textarea {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    font-family: var(--font-sans);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    color: var(--color-text-primary);
    transition: all var(--transition-fast);
}

input::placeholder,
textarea::placeholder {
    color: var(--color-text-muted);
}

input:focus,
select:focus,
textarea:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 3px var(--color-accent-subtle);
}

select {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.error-message {
    color: var(--color-danger);
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
    min-height: 1.25rem;
}

/* ===================== LOGIN VIEW ===================== */
.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.login-card {
    width: 100%;
    max-width: 400px;
    padding: var(--spacing-xl);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

.login-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-header .logo {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 56px;
    height: 56px;
    background-color: var(--color-accent-subtle);
    border-radius: var(--radius-lg);
    color: var(--color-accent);
    margin-bottom: var(--spacing-md);
}

.login-header h1 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
}

.login-header p {
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.login-card .form-group {
    margin-bottom: var(--spacing-md);
}

.login-card .btn {
    margin-top: var(--spacing-sm);
}

/* ===================== HEADER ===================== */
.header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.header-left .logo {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background-color: var(--color-accent-subtle);
    border-radius: var(--radius-md);
    color: var(--color-accent);
}

.header-left h1 {
    font-size: 1.125rem;
    font-weight: 600;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-email {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

/* ===================== MAIN CONTENT ===================== */
.main-content {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

/* ===================== CONTROLS SECTION ===================== */
.controls-section {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    flex-wrap: wrap;
}

.controls-left {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.controls-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    flex-wrap: wrap;
}

.sort-group {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.sort-group label {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    white-space: nowrap;
}

.sort-group select {
    width: auto;
    min-width: 140px;
}

.search-group {
    display: flex;
    align-items: center;
}

.search-input {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background-color: var(--color-surface);
    color: var(--color-text-primary);
    width: auto;
    min-width: 200px;
}

.search-input::placeholder {
    color: var(--color-text-muted);
}

.search-input:focus {
    outline: none;
    border-color: var(--color-accent);
    box-shadow: 0 0 0 2px var(--color-accent-subtle);
}

/* ===================== TABLE ===================== */
.table-container {
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

.inventory-table {
    width: 100%;
    border-collapse: collapse;
}

.inventory-table th,
.inventory-table td {
    padding: var(--spacing-md);
    text-align: left;
    vertical-align: top;
    border-bottom: 1px solid var(--color-border-subtle);
}

.inventory-table tbody tr {
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.inventory-table tbody tr:hover {
    background-color: var(--color-surface-elevated);
}

.inventory-table th {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-text-muted);
    background-color: var(--color-surface-elevated);
}

.inventory-table td {
    font-size: 0.875rem;
}

.inventory-table tbody tr {
    transition: background-color var(--transition-fast);
}

.inventory-table tbody tr:hover {
    background-color: var(--color-surface-elevated);
}

.inventory-table tbody tr:last-child td {
    border-bottom: none;
}

/* Row status colors */
.row-expired {
    background-color: var(--color-danger-subtle) !important;
    color: var(--color-danger) !important;
    font-weight: 500;
}

.row-expiring-soon {
    background-color: var(--color-warning-subtle) !important;
}

/* Actions cell */
.actions-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

/* Action buttons */
.btn-action {
    background: transparent;
    border: none;
    padding: var(--spacing-xs);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--color-text-muted);
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.btn-action:hover {
    background-color: var(--color-surface-elevated);
    color: var(--color-text-primary);
}

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

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

/* ===================== EMPTY STATE ===================== */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-muted);
}

.comment-icon {
    color: var(--color-text-muted);
    cursor: pointer;
    transition: color var(--transition-fast);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
}

.comment-icon:hover {
    color: var(--color-accent);
}

/* Comment Popover */
.comment-popover {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    z-index: 1100;
}

.comment-popover-content {
    background-color: var(--color-surface);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 400px;
    box-shadow: var(--shadow-xl);
    animation: modalEnter 0.2s ease-out;
}

.comment-popover-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-md) var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.comment-popover-header h3 {
    font-size: 1rem;
    font-weight: 600;
}

.comment-popover-body {
    padding: var(--spacing-lg);
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    white-space: pre-wrap;
    max-height: 50vh;
    overflow-y: auto;
}

.empty-state svg {
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.empty-state p {
    font-size: 1rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xs);
}

.empty-state span {
    font-size: 0.875rem;
}

/* ===================== LOADING STATE ===================== */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
    color: var(--color-text-muted);
}

.loading-state p {
    margin-top: var(--spacing-md);
    font-size: 0.875rem;
}

/* Spinner */
.spinner {
    animation: spin 1s linear infinite;
}

.spinner-large {
    width: 32px;
    height: 32px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ===================== MODAL ===================== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.4);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
    z-index: 1000;
    overflow-y: auto;
}

.modal {
    width: 100%;
    max-width: 500px;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    animation: modalEnter 0.2s ease-out;
    margin: auto;
}

@keyframes modalEnter {
    from {
        opacity: 0;
        transform: scale(0.95) translateY(-10px);
    }

    to {
        opacity: 1;
        transform: scale(1) translateY(0);
    }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.modal-header h2 {
    font-size: 1.125rem;
    font-weight: 600;
}

.modal form {
    padding: var(--spacing-lg);
}

.modal-footer {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.modal-footer-right {
    display: flex;
    gap: var(--spacing-sm);
}

/* ===================== RESPONSIVE ===================== */
@media (max-width: 768px) {
    .header {
        padding: var(--spacing-md);
    }

    .header-left h1 {
        display: none;
    }

    .main-content {
        padding: var(--spacing-md);
    }

    .controls-section {
        flex-direction: row;
        align-items: center;
    }

    .controls-left {
        justify-content: center;
    }

    .controls-right {
        flex-direction: row;
        gap: var(--spacing-md);
    }

    .sort-group {
        flex-direction: column;
        align-items: stretch;
    }

    .sort-group select {
        width: 100%;
    }

    .search-input {
        width: 100%;
        min-width: unset;
    }

    .table-container {
        overflow-x: auto;
    }

    .inventory-table {
        min-width: 700px;
    }

    .form-row {
        flex-direction: column;
    }

    .modal {
        max-width: 100%;
        margin: var(--spacing-md);
    }

    .user-email {
        display: none;
    }
}