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

:root {
    --primary-color: #FF6B35;
    --secondary-color: #F7931E;
    --accent-color: #4ECDC4;
    --text-dark: #2C3E50;
    --text-light: #7F8C8D;
    --bg-light: #F8F9FA;
    --bg-white: #FFFFFF;
    --border-color: #E1E8ED;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.08);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.12);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.16);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Hiragino Sans', 'Noto Sans CJK JP', sans-serif;
    line-height: 1.6;
    color: var(--text-dark);
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    overflow: hidden;
}

header {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 40px 30px;
    text-align: center;
}

h1 {
    font-size: 2.5em;
    font-weight: 700;
    margin-bottom: 10px;
    letter-spacing: -0.5px;
}

.subtitle {
    font-size: 1.1em;
    opacity: 0.95;
    margin-bottom: 20px;
}

.lang-selector {
    display: flex;
    gap: 10px;
    justify-content: center;
    flex-wrap: wrap;
}

.lang-btn {
    padding: 8px 16px;
    border: 2px solid rgba(255,255,255,0.3);
    background: rgba(255,255,255,0.1);
    color: white;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.9em;
    font-weight: 500;
}

.lang-btn:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.lang-btn.active {
    background: white;
    color: var(--primary-color);
    border-color: white;
}

main {
    padding: 40px 30px;
}

.recipe-input-section {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-md);
    margin-bottom: 30px;
}

.servings-adjuster {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 15px;
    align-items: center;
    margin-bottom: 30px;
}

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

.servings-adjuster input {
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1.1em;
    text-align: center;
    transition: border-color 0.3s ease;
}

.servings-adjuster input:focus {
    outline: none;
    border-color: var(--accent-color);
}

.unit-system {
    margin-bottom: 30px;
}

.unit-system label {
    font-weight: 600;
    display: block;
    margin-bottom: 10px;
}

.unit-toggle {
    display: flex;
    gap: 15px;
}

.unit-toggle input[type="radio"] {
    display: none;
}

.unit-toggle label {
    padding: 10px 20px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 500;
}

.unit-toggle input[type="radio"]:checked + label {
    background: var(--accent-color);
    color: white;
    border-color: var(--accent-color);
}

.ingredients-section h2 {
    font-size: 1.5em;
    margin-bottom: 20px;
    color: var(--text-dark);
}

#ingredients-list {
    margin-bottom: 20px;
}

.ingredient-row {
    display: grid;
    grid-template-columns: 100px 120px 1fr 40px;
    gap: 10px;
    margin-bottom: 12px;
    align-items: center;
}

.ingredient-row input,
.ingredient-row select {
    padding: 10px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1em;
    transition: border-color 0.3s ease;
}

.ingredient-row input:focus,
.ingredient-row select:focus {
    outline: none;
    border-color: var(--accent-color);
}

.remove-btn {
    width: 40px;
    height: 40px;
    border: none;
    background: #FF4757;
    color: white;
    border-radius: 50%;
    font-size: 1.5em;
    cursor: pointer;
    transition: all 0.3s ease;
}

.remove-btn:hover {
    background: #EE5A6F;
    transform: rotate(90deg);
}

.add-btn {
    padding: 12px 24px;
    background: var(--accent-color);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.add-btn:hover {
    background: #45B7B8;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.action-buttons {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.primary-btn,
.secondary-btn {
    flex: 1;
    padding: 15px 30px;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.primary-btn {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.secondary-btn {
    background: white;
    color: var(--text-dark);
    border: 2px solid var(--border-color);
}

.secondary-btn:hover {
    background: var(--bg-light);
}

.results-section {
    background: white;
    padding: 30px;
    border-radius: var(--radius-md);
    border: 2px solid var(--border-color);
    margin-bottom: 30px;
}

.results-section h2 {
    font-size: 1.8em;
    margin-bottom: 25px;
    color: var(--primary-color);
}

.results-section h3 {
    font-size: 1.3em;
    margin: 25px 0 15px;
    color: var(--text-dark);
}

.adjusted-list,
.shop-list {
    list-style: none;
    padding: 0;
}

.adjusted-list li {
    padding: 12px;
    background: var(--bg-light);
    margin-bottom: 10px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    transition: transform 0.2s ease;
}

.adjusted-list li:hover {
    transform: translateX(5px);
}

.amount-display {
    font-weight: 700;
    color: var(--primary-color);
    min-width: 60px;
}

.unit-display {
    color: var(--text-light);
    min-width: 60px;
    margin-left: 10px;
}

.name-display {
    color: var(--text-dark);
    margin-left: 20px;
}

.shop-list li {
    padding: 12px;
    background: white;
    border: 1px solid var(--border-color);
    margin-bottom: 8px;
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
}

.shop-list li:hover {
    background: var(--bg-light);
}

.shop-list input[type="checkbox"] {
    margin-right: 15px;
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.shopping-list-section {
    margin-top: 30px;
    padding-top: 30px;
    border-top: 2px solid var(--border-color);
}

.shopping-list-section .secondary-btn {
    margin-right: 10px;
    margin-top: 15px;
    flex: none;
    padding: 10px 20px;
}

.quick-templates {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-md);
}

.quick-templates h3 {
    font-size: 1.3em;
    margin-bottom: 20px;
    color: var(--text-dark);
}

.template-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
    gap: 15px;
}

.template-btn {
    padding: 15px;
    background: white;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: center;
}

.template-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
}

footer {
    background: var(--text-dark);
    color: white;
    text-align: center;
    padding: 20px;
    font-size: 0.9em;
}

@media (max-width: 768px) {
    .container {
        border-radius: 0;
    }
    
    body {
        padding: 0;
    }
    
    h1 {
        font-size: 2em;
    }
    
    .servings-adjuster {
        grid-template-columns: 1fr;
        gap: 10px;
    }
    
    .ingredient-row {
        grid-template-columns: 80px 100px 1fr 40px;
    }
    
    .action-buttons {
        flex-direction: column;
    }
    
    .template-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5em;
    }
    
    .ingredient-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }
    
    .ingredient-row input,
    .ingredient-row select {
        width: 100%;
    }
    
    .remove-btn {
        width: 100%;
        border-radius: var(--radius-sm);
    }
}