/* Google Fonts */
@import url("https://fonts.googleapis.com/css2?family=Raleway:wght@400;600;700&family=Open+Sans:wght@400;500;600&display=swap");

/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    /* Green Scale */
    --green-50: #E6F4F3;
    --green-100: #C5E9E6;
    --green-200: #9ED9D3;
    --green-300: #6EC1B9;
    --green-400: #47A6A0;
    --green-500: #115D5B;
    --green-600: #0F5251;
    --green-700: #0C4443;
    --green-800: #083735;
    --green-900: #052A28;

    /* Light Green */
    --light-green-50: #F5FAEE;
    --light-green-100: #E8F4D9;
    --light-green-400: #C5E99F;

    /* Greyscale */
    --greyscale-50: #FFFFFF;
    --greyscale-100: #F9FAFA;
    --greyscale-200: #F1F3F3;
    --greyscale-300: #E3E6E6;
    --greyscale-400: #CBD0D0;
    --greyscale-500: #A7AEAE;
    --greyscale-600: #757C7C;
    --greyscale-700: #4C5353;
    --greyscale-800: #2F3535;
    --greyscale-900: #000000;

    /* Error */
    --red-50: #FF6666;
    --red-100: #DA0707;
    --red-200: #990000;

    /* Color System Semantic Tokens */
    --color-primary: var(--green-500);
    --color-primary-dark: var(--green-700);
    --color-secondary: var(--light-green-400);
    --color-background: var(--greyscale-100);
    --color-card: var(--greyscale-50);
    --color-border: var(--greyscale-200);
    --color-border-medium: var(--greyscale-300);
    --color-text-primary: var(--greyscale-900);
    --color-text-secondary: var(--greyscale-800);

    /* Spacing Scale Tokens */
    --space-2xs: 4px;
    --space-xs: 8px;
    --space-sm: 12px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 40px;
    --space-3xl: 48px;
    --space-4xl: 64px;
    --space-5xl: 72px;
    --space-6xl: 80px;
    --space-7xl: 96px;
    --space-8xl: 128px;
    --space-9xl: 160px;
    --space-10xl: 192px;
}

html, body {
    font-family: 'Open Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 16px;
    line-height: 1.5;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-color: var(--green-900);
    color: var(--color-text-secondary);
}

body {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 16px;
}

/* Main App Container */
.app-container {
    width: 100%;
    max-width: 880px;
    background-color: var(--greyscale-50);
    border-radius: 40px;
    padding: 40px 40px 24px 40px;
    display: flex;
    flex-direction: column;

}

/* Typography */
h1 {
    font-family: 'Raleway', sans-serif;
    font-size: 40px;
    font-weight: 600;
    line-height: 48px;
    color: var(--color-text-primary);
}

h2 {
    font-family: 'Raleway', sans-serif;
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
    color: var(--color-text-primary);
}

h3 {
    font-family: 'Raleway', sans-serif;
    font-size: 20px;
    font-weight: 600;
    line-height: 24px;
    color: var(--color-text-primary);
}

h4 {
    font-family: 'Raleway', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--color-text-primary);
}

/* Body text sizes */
.body-lg {
    font-family: 'Open Sans', sans-serif;
    font-size: 20px;
    font-weight: 400;
    line-height: 24px;
}

.body-md {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.body-sm {
    font-family: 'Open Sans', sans-serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 24px;
}

p {
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

label {
    font-family: 'Open Sans', sans-serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 24px;
}

/* Mobile Typography Adjustments */
@media (max-width: 639px) {
    h1 {
        font-size: 32px;
        line-height: 48px;
    }
}

/* Header */
.header {
    background: linear-gradient(180deg, #115D5B -0.33%, #C5E99F 72.77%);
    border-radius: 24px;
    padding: 2rem 0;
    margin-bottom: 40px;
    z-index: 15;
}

.header-container {
    text-align: center;
    width: 100%;
    margin: 0 auto;
    padding: 0 20px;
}

.logo-container {
    display: flex;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.logo {
    width: 77px;
    height: 80px;
    object-fit: contain;
    animation: animate-bounce 1s ease-in-out infinite;
}

.subtitle {
    color: var(--color-text-secondary);
    font-size: 20px;
    line-height: 24px;
    font-weight: 500;
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn-primary {
    width: 100%;
    background-color: var(--green-500);
    color: white;
    border: none;
    border-radius: 128px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 12px 20px;
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    cursor: pointer;
    transition: background-color 0.15s ease;
}

.btn-primary:hover {
    background-color: var(--green-700);
}

.btn-secondary {
    flex: 1;
    width: 100%;
    min-height: 48px;
    background-color: var(--greyscale-50);
    border: 2px solid var(--greyscale-300);
    color: var(--color-text-secondary);
    border-radius: 128px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-xs);
    padding: 12px 20px;
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    cursor: pointer;
    transition: all 0.15s ease;
}

/* Utility: full-width button when needed (e.g., in forms/modals) */
.btn-full {
    width: 100%;
}

.btn-secondary:hover {
    background-color: var(--light-green-400);
    border-color: var(--light-green-400);
    color: var(--greyscale-900);
}

.icon {
    flex-shrink: 0;
}

/* Main Content */
.main-content {
    flex: 1;
    padding-bottom:16px;
}

.container {
    width: 100%;
    margin: 0 auto;
    padding: 0;
}

/* Empty State */
.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 0 1rem 4rem 1rem;
    position: relative;
}

.empty-state-box {
    position: relative;
    display: flex;
    flex-direction: column;
    align-items: center;
}

.empty-state-img {
    width: 264px;
    height: 305px;
    object-fit: contain;
}

.empty-state-text {
    position: absolute;
    bottom: 72px;
    left: 53%;
    transform: translateX(-50%);
    color: var(--color-text-secondary);
    font-size: 20px;
    line-height: 24px;
    font-weight: 400;
    text-align: center;
    width: 180px;
    margin: 0;
}

/* Products List */
.products-list {
    margin-bottom: 1.5rem;
}

.products-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

/* Product Card */
.product-card {
    background-color: var(--greyscale-50);
    border-radius: 16px;
    padding: var(--space-md);
    border: 2px solid var(--greyscale-200);
    transition: border-color 0.15s ease;
}

.product-card:hover {
    border-color: var(--greyscale-300);
}

.product-card-inner {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.product-card-top {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.checkbox-btn {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 9999px;
    border: 2px solid var(--greyscale-300);
    background-color: transparent;
    transition: all 0.15s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

.checkbox-btn.checked {
    border-color: var(--light-green-400);
    background-color: var(--light-green-400);
}

.checkbox-btn.active {
    transform: scale(1.1);
    border-color: var(--light-green-400);
    background-color: var(--light-green-400);
}

.checkbox-icon {
    display: none;
}

.checkbox-btn.checked .checkbox-icon {
    display: block;
}

/* Native checkbox styling: hide input, use label as visual checkbox */
.product-checkbox {
    position: absolute;
    left: -9999px;
    width: 1px;
    height: 1px;
    overflow: hidden;
    clip: rect(1px, 1px, 1px, 1px);
    white-space: nowrap;
}

/* Label acts as visual checkbox */
.product-checkbox + .checkbox-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

/* Checked state via adjacent sibling selector */
.product-checkbox:checked + .checkbox-btn {
    border-color: var(--light-green-400);
    background-color: var(--light-green-400);
}

/* Show checkmark when checked */
.product-checkbox:checked + .checkbox-btn .checkbox-icon {
    display: block;
}

/* Checkmark pop animation - satisfying scale-in effect */
@keyframes checkmark-pop {
    0% {
        transform: scale(0);
        opacity: 0;
    }
    50% {
        transform: scale(1.2);
    }
    100% {
        transform: scale(1);
        opacity: 1;
    }
}

/* Bounce animation - snappy completion feedback */
@keyframes bounce {
    0% {
        transform: scale(1);
    }
    50% {
        transform: scale(1.05);
    }
    100% {
        transform: scale(1);
    }
}

.product-card.bounce,
.products-container.bounce {
    animation: bounce 0.25s ease-out;
}

/* Animate bounce - continuous bouncing effect for logo */
@keyframes animate-bounce {
    0%, 100% {
        transform: translateY(0%);
    }
    50% {
        transform: translateY(-15%);
    }
}

/* Sparkle animation - gentle pulse and rotate for discount emoji */
@keyframes sparkle {
    0%, 100% {
        transform: rotate(0deg) scale(1);
    }
    25% {
        transform: rotate(-15deg) scale(1.1);
    }
    50% {
        transform: rotate(0deg) scale(1);
    }
    75% {
        transform: rotate(15deg) scale(1.1);
    }
}

.product-title {
    flex: 1;
    color: var(--color-text-secondary);
    font-size: 20px;
    line-height: 24px;
    font-weight: 400;
}

.product-title.completed {
    text-decoration: line-through;
    color: var(--greyscale-500);
}

.remove-btn {
    flex-shrink: 0;
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
    border-radius: 9999px;
    cursor: pointer;
    transition: background-color 0.15s ease;
    color: var(--greyscale-500);
}

.remove-btn:hover {
    background-color: var(--greyscale-100);
}

.product-inputs {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    padding: 0 3rem;
}

.input-group {
    width: 100%;
}

.input-label {
    display: block;
    margin-bottom: 0.375rem;
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 24px;
    font-weight: 400;
}

.form-input {
    width: 100%;
    min-height: 48px;
    padding: 12px 20px;
    border-radius: 128px;
    border: 2px solid var(--greyscale-300);
    background-color: var(--greyscale-100);
    color: var(--color-text-secondary);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    text-align: left;
    transition: all 0.15s ease;
    appearance: textfield;
    -moz-appearance: textfield;
}

.form-input[type="number"],
.form-input.price-input {
    text-align: center;
}

.form-input::-webkit-outer-spin-button,
.form-input::-webkit-inner-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.form-input:hover {
    background-color: var(--greyscale-200);
    border-color: var(--greyscale-300);
}

.form-input:focus {
    outline: none;
    background-color: var(--greyscale-50);
    border-color: var(--greyscale-900);
    color: var(--greyscale-900);
}

/* Accessible focus ring for keyboard users (use focus-visible where supported) */
.form-input:focus-visible {
    box-shadow: none;
    border-color: var(--color-primary-dark);
    outline: none;
}

/* Focus styles for interactive controls */
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.remove-btn:focus-visible,
.checkbox-btn:focus-visible,
.quantity-btn:focus-visible {
    /* White focus ring for buttons */
    box-shadow: 0 0 0 4px rgba(255, 255, 255, 1);
    outline: none;
}

.quantity-input-wrapper {
    position: relative;
    width: 100%;
}

.quantity-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
    border-radius: 9999px;
    cursor: pointer;
    transition: background-color 0.15s ease;
    color: var(--color-text-secondary);
}

.quantity-btn:hover {
    background-color: var(--greyscale-300);
}

.quantity-btn-minus {
    left: 0.25rem;
}

.quantity-btn-plus {
    right: 0.25rem;
}

.quantity-input-wrapper .form-input {
    padding-left: 3rem;
    padding-right: 3rem;
}

/* Footer */
.footer {
    width: 100%;
    position: sticky;
    bottom: 24px;
    z-index: 10;
}

.footer-container {
    width: 100%;
    margin: 0 auto;
}

.footer-card {
    background-color: var(--green-500);
    border-radius: 24px;
    padding: 24px;
    width: 100%;
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}

.subtotal-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.subtotal-label {
    color: var(--greyscale-50);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.subtotal-value {
    color: var(--greyscale-50);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.discount-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.discount-label {
    color: var(--greyscale-50);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.discount-value {
    color: var(--light-green-400);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
}

.discount-section {
    background-color: var(--light-green-100);
    border-radius: 24px;
    padding: 16px;
    margin-top: 40px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.discount-header {
    display: flex;
    align-items: center;
    gap: 8px;
}

.discount-emoji {
    width: 40px;
    height: 40px;
    font-size: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    animation: sparkle 2s ease-in-out infinite;
}

.discount-title {
    color: var(--greyscale-900);
    font-family: 'Raleway', sans-serif;
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
    margin: 0;
}

.discount-content {
    padding: 0 48px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.discount-description {
    color: var(--greyscale-800);
    font-family: 'Open Sans', sans-serif;
    font-size: 16px;
    font-weight: 400;
    line-height: 24px;
    text-align: left;
    margin: 0;
}

.discount-input {
    text-align: center;
}

.discount-input-wrapper {
    position: relative;
    width: 100%;
}

.discount-percent-symbol {
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    color: var(--greyscale-900);
    font-family: 'Open Sans', sans-serif;
    font-size: 20px;
    font-weight: 400;
    line-height: 24px;
    pointer-events: none;
}

.footer-divider {
    width: 100%;
    height: 1px;
    background-color: var(--green-400);
}

.total-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 100%;
}

.total-label {
    color: var(--greyscale-50);
    font-family: 'Raleway', sans-serif;
    font-size: 20px;
    font-weight: 600;
    line-height: 24px;
}

.total-value {
    color: var(--greyscale-50);
    font-family: 'Raleway', sans-serif;
    font-size: 24px;
    font-weight: 600;
    line-height: 32px;
}

.footer-metadata {
    color: var(--greyscale-300);
    font-family: 'Open Sans', sans-serif;
    font-size: 14px;
    font-weight: 400;
    line-height: 24px;
    text-align: center;
}

/* Add Product Form (Inline) */
.add-product-form-container {
    width: 100%;
    background-color: var(--greyscale-50);
    border-radius: 24px;
    padding: 24px;
    margin-top: 24px;
    text-align: left;
}

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

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

.form-header label {
    color: var(--color-text-secondary);
    font-size: 20px;
    line-height: 24px;
    font-weight: 400;
    margin: 0;
}

.form-close-btn {
    width: 2.5rem;
    height: 2.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    border: none;
    border-radius: 9999px;
    cursor: pointer;
    transition: background-color 0.15s ease;
    color: var(--greyscale-500);
    flex-shrink: 0;
}

.form-close-btn:hover {
    background-color: var(--greyscale-100);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 50;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.show {
    display: flex;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.4);
}

.modal-content {
    background-color: var(--greyscale-50);
    width: 100%;
    max-width: 480px;
    border-radius: 16px;
    padding: var(--space-lg);
    position: relative;
    z-index: 51;
}

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

.modal-subtitle {
    color: var(--color-text-secondary);
    font-size: 20px;
    line-height: 24px;
    font-weight: 400;
}

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

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    margin-bottom: 0.375rem;
    color: var(--color-text-secondary);
    font-size: 16px;
    line-height: 24px;
    font-weight: 400;
}

.form-actions {
    display: flex;
    flex-direction: column-reverse;
    gap: 0.75rem;
}

.form-actions .btn-primary,
.form-actions .btn-secondary {
    flex: 1;
    width: auto;
}

/* Media Queries - Breakpoints per Guidelines */
/* sm: 0-639px (mobile) */
@media (max-width: 639px) {
    .app-container {
        padding: 16px 16px 24px 16px;
    }
}

/* md: 640px-1024px (tablet) */
@media (min-width: 640px) {
    .app-container {
        max-width: 580px;
        padding: 24px 24px 24px 24px;
    }

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

/* lg: 1024px+ (desktop) */
@media (min-width: 1024px) {
    .app-container {
        max-width: 780px;
    }
}