/* ================================
   CSS Variables & Reset
================================ */
:root {
    /* Colors */
    --primary: #ff7043;
    --primary-dark: #e64a19;
    --primary-light: #ffab91;
    --secondary: #ff9800;
    --accent: #ffc107;

    --text-primary: #1a1a2e;
    --text-secondary: #4a5568;
    --text-muted: #718096;

    --bg-primary: #ffffff;
    --bg-secondary: #f7fafc;
    --bg-gradient-start: #fff5f0;
    --bg-gradient-end: #e3f2fd;

    --border-color: #e2e8f0;
    --shadow-color: rgba(0, 0, 0, 0.1);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;

    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    --radius-full: 9999px;

    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;

    /* Header Height */
    --header-height: 70px;

    /* Font Family */
    --font-primary: 'Noto Sans JP', 'M PLUS Rounded 1c', sans-serif;
    --font-display: 'M PLUS Rounded 1c', sans-serif;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    line-height: 1.6;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    overflow-x: hidden;
}

/* ================================
   Container
================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ================================
   Header & Navigation
================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-normal);
}

.header.scrolled {
    box-shadow: 0 4px 20px var(--shadow-color);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
    color: var(--text-primary);
    font-family: var(--font-display);
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.75rem;
}

/* Hamburger Menu */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 28px;
    height: 20px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1001;
}

.hamburger-line {
    display: block;
    width: 100%;
    height: 3px;
    background: var(--text-primary);
    border-radius: var(--radius-full);
    transition: var(--transition-normal);
    transform-origin: center;
}

.hamburger.active .hamburger-line:nth-child(1) {
    transform: translateY(8.5px) rotate(45deg);
}

.hamburger.active .hamburger-line:nth-child(2) {
    opacity: 0;
}

.hamburger.active .hamburger-line:nth-child(3) {
    transform: translateY(-8.5px) rotate(-45deg);
}

/* Navigation */
.nav {
    display: flex;
    align-items: center;
}

.nav-list {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--space-sm) 0;
    position: relative;
    transition: var(--transition-normal);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary);
    transition: var(--transition-normal);
}

.nav-link:hover {
    color: var(--primary);
}

.nav-link:hover::after {
    width: 100%;
}

/* Overlay */
.overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: 999;
}

.overlay.active {
    opacity: 1;
    visibility: visible;
}

/* ================================
   Hero Section
================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: calc(var(--header-height) + var(--space-2xl)) var(--space-md) var(--space-2xl);
    overflow: hidden;
}

.hero-content {
    text-align: center;
    max-width: 700px;
    z-index: 1;
}

.hero-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
}

.hero-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 1.1rem;
    padding: var(--space-md) var(--space-xl);
    border-radius: var(--radius-full);
    box-shadow: 0 4px 15px rgba(255, 112, 67, 0.4);
    transition: var(--transition-normal);
}

.hero-cta:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(255, 112, 67, 0.5);
}

.cta-arrow {
    transition: var(--transition-normal);
}

.hero-cta:hover .cta-arrow {
    transform: translateX(5px);
}

/* Floating Emojis */
.hero-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
}

.floating-emoji {
    position: absolute;
    left: var(--x);
    top: var(--y);
    font-size: 2.5rem;
    animation: float 6s ease-in-out infinite;
    animation-delay: var(--delay);
    opacity: 0.7;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-20px) rotate(10deg);
    }
}

/* ================================
   Input Section
================================ */
.input-section {
    padding: var(--space-3xl) 0;
}

.input-card {
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: var(--space-xl);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.08);
    max-width: 700px;
    margin: 0 auto;
}

.section-title {
    font-family: var(--font-display);
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: var(--space-xl);
    color: var(--text-primary);
}

.section-title.centered {
    text-align: center;
}

.form-group {
    margin-bottom: var(--space-lg);
}

.form-group-inline {
    flex: 1;
}

.form-row {
    display: flex;
    gap: var(--space-lg);
    align-items: flex-end;
}

.form-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.label-icon {
    color: var(--primary);
}

.form-textarea {
    width: 100%;
    padding: var(--space-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    resize: vertical;
    transition: var(--transition-normal);
    min-height: 120px;
}

.form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 112, 67, 0.1);
}

.form-textarea::placeholder {
    color: var(--text-muted);
}

/* Number Input */
.number-input {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: var(--space-sm);
}

.number-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.number-btn:hover {
    background: var(--primary-light);
    border-color: var(--primary);
}

.form-input {
    width: 60px;
    text-align: center;
    font-size: 1.25rem;
    font-weight: 600;
    border: none;
    background: transparent;
    font-family: inherit;
}

.form-input:focus {
    outline: none;
}

/* Hide number input spinners */
.form-input::-webkit-inner-spin-button,
.form-input::-webkit-outer-spin-button {
    -webkit-appearance: none;
    margin: 0;
}

.form-input {
    -moz-appearance: textfield;
}

/* Submit Button */
.submit-btn {
    width: 100%;
    padding: var(--space-md) var(--space-xl);
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    box-shadow: 0 4px 15px rgba(255, 112, 67, 0.3);
    position: relative;
    overflow: hidden;
}

.submit-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(255, 112, 67, 0.4);
}

.submit-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.btn-content,
.btn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
}

.btn-loading {
    display: none;
}

.submit-btn.loading .btn-content {
    display: none;
}

.submit-btn.loading .btn-loading {
    display: flex;
}

.btn-icon {
    flex-shrink: 0;
}

/* Spinner */
.spinner {
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* Error Message */
.error-message {
    display: none;
    margin-top: var(--space-md);
    padding: var(--space-md);
    background: #fef2f2;
    border: 1px solid #fecaca;
    border-radius: var(--radius-sm);
    color: #dc2626;
    text-align: center;
}

.error-message.show {
    display: block;
}

/* ================================
   Recipes Section
================================ */
.recipes-section {
    padding: var(--space-2xl) 0 var(--space-3xl);
}

.recipes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--space-xl);
}

/* Recipe Card */
.recipe-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    border-top: 4px solid var(--primary);
    display: flex;
    flex-direction: column;
    transition: var(--transition-normal);
}

.recipe-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.12);
}

.recipe-card-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.recipe-card-desc {
    color: var(--text-secondary);
    font-size: 0.95rem;
    flex-grow: 1;
    margin-bottom: var(--space-md);
}

.recipe-card-servings {
    font-size: 0.875rem;
    color: var(--text-muted);
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.recipe-card-btn {
    width: 100%;
    padding: var(--space-md);
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
}

.recipe-card-btn:hover {
    background: linear-gradient(135deg, #fde68a 0%, #fbbf24 100%);
}

/* Recipe Card Nutrition */
.recipe-card-nutrition {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    padding: var(--space-sm);
    background: linear-gradient(135deg, #fef3c7 0%, #fff7ed 100%);
    border-radius: var(--radius-sm);
}

.nutrition-item {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* Modal Nutrition */
.modal-nutrition {
    background: linear-gradient(135deg, #fef3c7 0%, #ffedd5 100%);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
}

.modal-nutrition h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
    text-align: center;
}

.nutrition-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-sm);
}

.nutrition-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--space-sm);
    background: white;
    border-radius: var(--radius-sm);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.nutrition-icon {
    font-size: 1.5rem;
    margin-bottom: var(--space-xs);
}

.nutrition-value {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-primary);
}

.nutrition-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

@media (max-width: 480px) {
    .nutrition-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* ================================
   Features Section
================================ */
.features {
    padding: var(--space-3xl) 0;
    background: rgba(255, 255, 255, 0.5);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--space-xl);
    margin-top: var(--space-xl);
}

.feature-card {
    text-align: center;
    padding: var(--space-xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--space-md);
}

.feature-title {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--space-sm);
}

.feature-text {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* ================================
   Footer
================================ */
.footer {
    padding: var(--space-xl) 0;
    background: var(--text-primary);
    color: white;
    text-align: center;
}

.footer-text {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ================================
   Modal
================================ */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
}

.modal.active {
    opacity: 1;
    visibility: visible;
}

.modal-container {
    background: white;
    border-radius: var(--radius-xl);
    width: 100%;
    max-width: 600px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px rgba(0, 0, 0, 0.25);
    transform: scale(0.9);
    transition: var(--transition-normal);
}

.modal.active .modal-container {
    transform: scale(1);
}

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

.modal-title {
    font-family: var(--font-display);
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-normal);
}

.modal-close:hover {
    background: #fee2e2;
    color: #dc2626;
}

.modal-content {
    padding: var(--space-lg);
    overflow-y: auto;
    flex: 1;
}

/* Modal Scrollbar */
.modal-content::-webkit-scrollbar {
    width: 8px;
}

.modal-content::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb {
    background: var(--primary-light);
    border-radius: 10px;
}

.modal-content::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}

/* Modal Ingredients */
.modal-ingredients {
    background: #f0fdf4;
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin-bottom: var(--space-lg);
}

.modal-ingredients h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.modal-ingredients ul {
    list-style: none;
}

.modal-ingredients li {
    display: flex;
    justify-content: space-between;
    padding: var(--space-sm) 0;
    border-bottom: 1px solid #dcfce7;
    color: var(--text-secondary);
}

.modal-ingredients li:last-child {
    border-bottom: none;
}

.ingredient-name {
    font-weight: 500;
}

.ingredient-amount {
    font-family: monospace;
    font-size: 0.95rem;
}

/* Modal Servings Adjuster */
.servings-adjuster {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-md);
    background: linear-gradient(135deg, #fff7ed 0%, #ffedd5 100%);
    border-radius: var(--radius-md);
    padding: var(--space-md);
    margin: var(--space-lg) 0;
}

.servings-adjuster label {
    font-weight: 600;
    color: var(--text-primary);
}

.servings-adjuster .number-input {
    background: white;
}

/* Modal Instructions */
.modal-instructions h4 {
    font-family: var(--font-display);
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--space-md);
}

.modal-instructions ol {
    list-style: none;
    counter-reset: steps;
}

.modal-instructions li {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md) 0;
    color: var(--text-secondary);
    line-height: 1.7;
}

.step-number {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: var(--primary);
    color: white;
    border-radius: 50%;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

/* ================================
   Mobile Styles
================================ */
@media (max-width: 768px) {
    :root {
        --header-height: 60px;
    }

    /* Hamburger Menu Visible */
    .hamburger {
        display: flex;
    }

    /* Mobile Navigation */
    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: white;
        padding: calc(var(--header-height) + var(--space-xl)) var(--space-xl) var(--space-xl);
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.1);
        transition: var(--transition-normal);
        z-index: 1000;
    }

    .nav.active {
        right: 0;
    }

    .nav-list {
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
    }

    .nav-link {
        display: block;
        width: 100%;
        padding: var(--space-md) 0;
        font-size: 1.1rem;
        border-bottom: 1px solid var(--border-color);
    }

    .nav-link::after {
        display: none;
    }

    /* Hero */
    .hero {
        padding: calc(var(--header-height) + var(--space-xl)) var(--space-md) var(--space-xl);
        min-height: auto;
    }

    .floating-emoji {
        font-size: 1.75rem;
        opacity: 0.5;
    }

    /* Input Section */
    .input-card {
        padding: var(--space-lg);
    }

    .section-title {
        font-size: 1.5rem;
    }

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

    /* Modal */
    .modal-container {
        max-height: 95vh;
        border-radius: var(--radius-lg);
    }

    .modal-title {
        font-size: 1.25rem;
    }
}

@media (max-width: 480px) {

    /* Even smaller adjustments */
    .hero-title {
        font-size: 1.75rem;
    }

    .hero-cta {
        width: 100%;
        justify-content: center;
    }

    .input-card {
        padding: var(--space-md);
    }

    .recipes-grid {
        grid-template-columns: 1fr;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .modal {
        padding: var(--space-sm);
    }

    .modal-container {
        border-radius: var(--radius-md);
    }
}