/* Material You 3 Design System */
:root {
    --md-sys-color-primary: #006A6A;
    --md-sys-color-on-primary: #FFFFFF;
    --md-sys-color-primary-container: #6FF7F6;
    --md-sys-color-on-primary-container: #002020;
    --md-sys-color-secondary: #4A6363;
    --md-sys-color-on-secondary: #FFFFFF;
    --md-sys-color-secondary-container: #CCE8E7;
    --md-sys-color-on-secondary-container: #051F1F;
    --md-sys-color-tertiary: #4A607C;
    --md-sys-color-on-tertiary: #FFFFFF;
    --md-sys-color-tertiary-container: #D2E4FF;
    --md-sys-color-on-tertiary-container: #031C35;
    --md-sys-color-surface: #FAFDFC;
    --md-sys-color-on-surface: #191C1C;
    --md-sys-color-surface-variant: #DAE5E4;
    --md-sys-color-on-surface-variant: #3F4948;
    --md-sys-color-surface-container: #F3F8F7;
    --md-sys-color-surface-container-low: #F8FBFA;
    --md-sys-color-surface-container-high: #EDEEED;
    --md-sys-color-surface-container-highest: #E7E9E8;
    --md-sys-color-outline: #6F7978;
    --md-sys-color-outline-variant: #BEC9C8;
    --md-sys-color-error: #BA1A1A;
    --md-sys-color-on-error: #FFFFFF;
    --md-sys-color-error-container: #FFDAD6;
    --md-sys-color-on-error-container: #410002;
    --md-sys-color-background: #FAFDFC;
    --md-sys-color-on-background: #191C1C;
    
    /* Elevation */
    --md-elevation-1: 0px 1px 2px 0px rgba(0, 0, 0, 0.3), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
    --md-elevation-2: 0px 1px 2px 0px rgba(0, 0, 0, 0.3), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
    --md-elevation-3: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px 0px rgba(0, 0, 0, 0.3);
    
    /* Border radius */
    --md-radius-sm: 8px;
    --md-radius-md: 12px;
    --md-radius-lg: 16px;
    --md-radius-xl: 28px;
    --md-radius-full: 9999px;
}

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

html {
    font-size: 18.4px;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Oxygen',
        'Ubuntu', 'Cantarell', 'Fira Sans', 'Droid Sans', 'Helvetica Neue',
        sans-serif;
    background: var(--md-sys-color-background);
    color: var(--md-sys-color-on-background);
    min-height: 100dvh;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Navigation */
.navbar {
    background: var(--md-sys-color-surface);
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    position: sticky;
    top: 0;
    z-index: 100;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    min-height: 64px;
}

.nav-brand {
    font-size: 1.25rem;
    font-weight: 500;
    letter-spacing: 0.0125em;
    color: var(--md-sys-color-on-surface);
    padding: 0.75rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.nav-item {
    padding: 0.375rem 0;
}

.nav-link {
    text-decoration: none;
    color: var(--md-sys-color-on-surface-variant);
    font-weight: 500;
    font-size: 0.875rem;
    letter-spacing: 0.00625em;
    padding: 0.625rem 1.5rem;
    border-radius: var(--md-radius-full);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    min-height: 40px;
    white-space: nowrap;
}

.nav-link:hover {
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
}

.nav-link:active {
    background: var(--md-sys-color-surface-container-highest);
}

.nav-link.active {
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem;
    width: 100%;
}

/* Welcome section */
.welcome-section {
    background: var(--md-sys-color-surface-container);
    padding: 1.5rem 1.25rem;
    border-radius: var(--md-radius-lg);
    margin-bottom: 1rem;
    box-shadow: var(--md-elevation-1);
}

.welcome-section h1 {
    color: var(--md-sys-color-on-surface);
    font-size: 1.75rem;
    font-weight: 400;
    letter-spacing: 0.0125em;
    margin-bottom: 0.5rem;
    line-height: 2rem;
    border: none;
    padding: 0;
}

.subtitle {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 1rem;
    letter-spacing: 0.03125em;
    line-height: 1.5rem;
}

/* Section */
.section {
    background: var(--md-sys-color-surface-container);
    padding: 1.25rem;
    border-radius: var(--md-radius-lg);
    margin-bottom: 1rem;
    box-shadow: var(--md-elevation-1);
}

.section h1 {
    color: var(--md-sys-color-on-surface);
    font-size: 1.375rem;
    font-weight: 400;
    letter-spacing: 0;
    margin-bottom: 0.375rem;
    line-height: 1.75rem;
    border: none;
    padding: 0;
}

.section h2 {
    color: var(--md-sys-color-on-surface);
    font-size: 1.125rem;
    font-weight: 400;
    letter-spacing: 0.009375em;
    margin-bottom: 0.75rem;
    line-height: 1.5rem;
}

.section-description {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
    letter-spacing: 0.015625em;
    margin-bottom: 1rem;
    line-height: 1.25rem;
}

/* Form elements */
.form-row {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 0.875rem;
    flex-wrap: wrap;
    align-items: flex-end;
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
    gap: 0.875rem;
    align-items: end;
}

.form-group {
    display: flex;
    flex-direction: column;
    gap: 0.375rem;
    min-width: 0;
    flex: 1;
}

label {
    font-weight: 500;
    color: var(--md-sys-color-on-surface);
    font-size: 0.75rem;
    letter-spacing: 0.03125em;
    line-height: 1rem;
}

/* Inputs */
input[type="text"],
input[type="date"],
select,
.custom-select {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-radius-sm);
    font-size: 0.875rem;
    font-family: inherit;
    color: var(--md-sys-color-on-surface);
    background: var(--md-sys-color-surface);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 40px;
    width: 100%;
}

input[type="text"]:hover,
input[type="date"]:hover,
select:hover,
.custom-select:hover {
    border-color: var(--md-sys-color-on-surface);
}

input[type="text"]:focus,
input[type="date"]:focus,
select:focus,
.custom-select:focus,
.custom-select.active {
    outline: none;
    border-color: var(--md-sys-color-primary);
    border-width: 2px;
    padding: calc(0.5rem - 1px) calc(0.75rem - 1px);
}

input[type="text"]::placeholder {
    color: var(--md-sys-color-on-surface-variant);
    opacity: 0.7;
}

/* Buttons - Material 3 filled button */
button {
    padding: 0 1.5rem;
    background: var(--md-sys-color-primary);
    color: var(--md-sys-color-on-primary);
    border: none;
    border-radius: var(--md-radius-full);
    cursor: pointer;
    font-size: 0.875rem;
    font-family: inherit;
    font-weight: 500;
    letter-spacing: 0.00625em;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 40px;
    min-width: 64px;
    box-shadow: var(--md-elevation-1);
    display: flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
}

button:hover {
    background: color-mix(in srgb, var(--md-sys-color-primary) 92%, black);
    box-shadow: var(--md-elevation-2);
}

button:active {
    background: color-mix(in srgb, var(--md-sys-color-primary) 88%, black);
    box-shadow: var(--md-elevation-1);
}

button:focus-visible {
    outline: 3px solid var(--md-sys-color-primary-container);
    outline-offset: 2px;
}

.ghost-button {
    background: transparent;
    color: var(--md-sys-color-primary);
    box-shadow: none;
}

.ghost-button:hover {
    background: var(--md-sys-color-surface-container-high);
    box-shadow: none;
}

.modal-backdrop {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
}

.modal {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: var(--md-sys-color-surface);
    border-radius: var(--md-radius-lg);
    box-shadow: var(--md-elevation-3);
    padding: 1.5rem;
    width: min(90vw, 320px);
    z-index: 1001;
}

.modal-content h3 {
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
    color: var(--md-sys-color-on-surface);
}

.modal-content p {
    font-size: 0.875rem;
    color: var(--md-sys-color-on-surface-variant);
    margin-bottom: 1rem;
}

.modal-actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    margin-top: 1rem;
}

.input-label {
    display: block;
    margin-bottom: 0.5rem;
}

.icon-button {
    padding: 0;
    min-width: 40px;
    width: 40px;
    height: 40px;
    border-radius: var(--md-radius-full);
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface);
    box-shadow: none;
    font-size: 1.25rem;
    line-height: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.icon-button:hover {
    background: var(--md-sys-color-surface-container-high);
    box-shadow: var(--md-elevation-1);
}

.icon-button:active {
    background: var(--md-sys-color-surface-container-highest);
}

.delete-btn {
    background: var(--md-sys-color-error);
    color: var(--md-sys-color-on-error);
    padding: 0 1rem;
    min-height: 32px;
    font-size: 0.75rem;
    letter-spacing: 0.017857em;
    box-shadow: none;
}

.delete-btn:hover {
    background: color-mix(in srgb, var(--md-sys-color-error) 92%, black);
    box-shadow: var(--md-elevation-1);
}

.delete-btn:active {
    background: color-mix(in srgb, var(--md-sys-color-error) 88%, black);
    box-shadow: none;
}

/* Category list */
.category-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.category-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    padding: 0 0.75rem 0 1rem;
    border-radius: var(--md-radius-full);
    font-size: 0.75rem;
    font-weight: 500;
    letter-spacing: 0.017857em;
    min-height: 32px;
    max-width: 100%;
}

.category-tag button {
    background: transparent;
    border: none;
    color: var(--md-sys-color-on-secondary-container);
    padding: 0;
    border-radius: var(--md-radius-full);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 400;
    width: 20px;
    height: 20px;
    min-width: 20px;
    min-height: 20px;
    line-height: 1;
    box-shadow: none;
    margin-left: 0.25rem;
}

.category-tag button:hover {
    background: rgba(0, 0, 0, 0.08);
    box-shadow: none;
}

.category-tag button:active {
    background: rgba(0, 0, 0, 0.12);
    box-shadow: none;
}

/* Custom dropdown */
.custom-select {
    position: relative;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
    text-overflow: ellipsis;
    white-space: nowrap;
    overflow: hidden;
}

.custom-select .dropdown-arrow {
    margin-left: 0.5rem;
    font-size: 0.75rem;
}

.custom-select-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--md-sys-color-surface);
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-radius-sm);
    margin-top: 0.25rem;
    max-height: 220px;
    overflow-y: auto;
    z-index: 200;
    box-shadow: var(--md-elevation-2);
    display: none;
}

.custom-select-option {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    cursor: pointer;
    color: var(--md-sys-color-on-surface);
    display: block;
}

.custom-select-option:hover {
    background: var(--md-sys-color-surface-container-high);
}

.custom-select-option.selected {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
}

.form-group {
    position: relative;
}

/* Filter row */
.filter-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    margin-bottom: 0.875rem;
    padding: 0.875rem;
    background: var(--md-sys-color-surface);
    border-radius: var(--md-radius-md);
    border: 1px solid var(--md-sys-color-outline-variant);
    align-items: flex-end;
}

.filter-row .form-group {
    flex: 1 1 0%;
    min-width: 80px;
}

.filter-row .form-group-toggle {
    flex: 0 0 44px;
}

/* Table */
.items-container {
    overflow-x: auto;
    background: var(--md-sys-color-surface);
    border-radius: var(--md-radius-md);
    border: 1px solid var(--md-sys-color-outline-variant);
    width: 100%;
}

table {
    width: 100%;
    border-collapse: collapse;
    min-width: 600px;
}

thead {
    background: var(--md-sys-color-surface-container-high);
}

th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 500;
    font-size: 0.75rem;
    letter-spacing: 0.00625em;
    color: var(--md-sys-color-on-surface-variant);
    text-transform: none;
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    white-space: nowrap;
}

tbody tr {
    border-bottom: 1px solid var(--md-sys-color-outline-variant);
    transition: background 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

tbody tr:last-child {
    border-bottom: none;
}

tbody tr:hover {
    background: var(--md-sys-color-surface-container-high);
}

tbody tr:active {
    background: var(--md-sys-color-surface-container-highest);
}

td {
    padding: 0.625rem 1rem;
    color: var(--md-sys-color-on-surface);
    font-size: 0.875rem;
    letter-spacing: 0.015625em;
    vertical-align: middle;
}

/* Login page - Material You 3 */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100dvh;
    padding: 1.5rem;
    background:
        radial-gradient(1200px 600px at 50% -10%, var(--md-sys-color-primary-container) 0%, transparent 60%),
        var(--md-sys-color-background);
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: var(--md-sys-color-surface-container);
    border-radius: var(--md-radius-xl);
    box-shadow: var(--md-elevation-2);
    padding: 2rem 1.75rem 1.75rem;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.login-hero {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 0.75rem;
}

.login-icon {
    width: 72px;
    height: 72px;
    border-radius: var(--md-radius-full);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--md-elevation-1);
    margin-bottom: 0.25rem;
}

.login-title {
    color: var(--md-sys-color-on-surface);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0;
    line-height: 2rem;
    margin: 0;
    border: none;
    padding: 0;
}

.login-subtitle {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.875rem;
    letter-spacing: 0.015625em;
    line-height: 1.25rem;
    margin: 0;
}

.login-form {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.login-heading {
    color: var(--md-sys-color-on-surface);
    font-size: 1.125rem;
    font-weight: 500;
    letter-spacing: 0.009375em;
    line-height: 1.5rem;
    margin: 0;
    text-align: center;
}

.login-description {
    color: var(--md-sys-color-on-surface-variant);
    font-size: 0.8125rem;
    letter-spacing: 0.015625em;
    line-height: 1.125rem;
    margin: 0;
    text-align: center;
}

.login-field {
    gap: 0.5rem;
}

.login-field input[type="password"] {
    padding: 0.875rem 1rem;
    border: 1px solid var(--md-sys-color-outline);
    border-radius: var(--md-radius-md);
    font-size: 0.9375rem;
    font-family: inherit;
    color: var(--md-sys-color-on-surface);
    background: var(--md-sys-color-surface-container-high);
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    min-height: 52px;
    width: 100%;
}

.login-field input[type="password"]:hover {
    border-color: var(--md-sys-color-on-surface-variant);
}

.login-field input[type="password"]:focus {
    outline: none;
    border-color: var(--md-sys-color-primary);
    border-width: 2px;
    padding: calc(0.875rem - 1px) calc(1rem - 1px);
    background: var(--md-sys-color-surface);
}

.login-field input[type="password"]::placeholder {
    color: var(--md-sys-color-on-surface-variant);
    opacity: 0.7;
}

.login-button {
    width: 100%;
    min-height: 52px;
    font-size: 0.9375rem;
    letter-spacing: 0.01em;
    margin-top: 0.25rem;
}

.login-error {
    color: var(--md-sys-color-on-error-container);
    background: var(--md-sys-color-error-container);
    border-radius: var(--md-radius-md);
    padding: 0.75rem 1rem;
    text-align: center;
    font-size: 0.8125rem;
    letter-spacing: 0.015625em;
}

@media (max-width: 480px) {
    .login-card {
        padding: 1.5rem 1.25rem 1.25rem;
        border-radius: var(--md-radius-lg);
    }
    .login-icon {
        width: 64px;
        height: 64px;
    }
    .login-title {
        font-size: 1.375rem;
        line-height: 1.875rem;
    }
}

/* Responsive - Tablet friendly */
@media (max-width: 1024px) {
    .container {
        padding: 0.875rem;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 17.25px;
    }
    
    .filter-row .form-group {
        flex: 1 1 40%;
    }
    .filter-row .form-group-toggle {
        flex: 0 0 44px;
    }
    
    .nav-container {
        flex-direction: column;
        align-items: flex-start;
        padding: 0 0.875rem;
        min-height: auto;
    }
    
    .nav-brand {
        padding: 0.625rem 0 0.5rem 0;
        font-size: 1.125rem;
    }
    
    .nav-menu {
        width: 100%;
        gap: 0.375rem;
        padding-bottom: 0.5rem;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
        flex-wrap: nowrap;
        scrollbar-width: none;
        -ms-overflow-style: none;
    }
    
    .nav-menu::-webkit-scrollbar {
        display: none;
    }
    
    .nav-item {
        flex-shrink: 0;
        padding: 0.25rem 0;
    }
    
    .nav-link {
        font-size: 0.8125rem;
        padding: 0.5rem 1rem;
        min-height: 36px;
    }
    
    .container {
        padding: 0.75rem;
    }
    
    .section,
    .welcome-section {
        padding: 1rem 0.875rem;
        border-radius: var(--md-radius-md);
    }
    
    .welcome-section h1 {
        font-size: 1.5rem;
        line-height: 1.875rem;
    }
    
    .section h1 {
        font-size: 1.25rem;
        line-height: 1.625rem;
    }
    
    .section h2 {
        font-size: 1rem;
        line-height: 1.375rem;
    }
    
    .form-grid {
        grid-template-columns: 1fr;
        gap: 0.75rem;
    }
    
    .form-row {
        flex-direction: column;
        align-items: stretch;
        gap: 0.625rem;
    }
    
    .form-row > * {
        width: 100%;
        flex: 1 1 auto;
    }
    
    .filter-row {
        grid-template-columns: 1fr;
        padding: 0.75rem;
        gap: 0.625rem;
    }
    
    table {
        min-width: 560px;
        font-size: 0.8125rem;
    }
    
    th,
    td {
        padding: 0.5rem 0.75rem;
    }
    
    .delete-btn {
        min-height: 28px;
        font-size: 0.6875rem;
        padding: 0 0.875rem;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .nav-container,
    .container {
        padding: 0 0.625rem;
    }
    
    .section,
    .welcome-section {
        padding: 0.875rem 0.75rem;
    }
    
    .welcome-section h1 {
        font-size: 1.375rem;
    }
    
    .category-tag {
        font-size: 0.6875rem;
        min-height: 28px;
        padding: 0 0.625rem 0 0.875rem;
    }
}