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

:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --light-bg: #ecf0f1;
    --card-bg: #ffffff;
    --text-dark: #2c3e50;
    --text-light: #7f8c8d;
    --border-color: #bdc3c7;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 5px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: var(--text-dark);
    line-height: 1.6;
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 40px 20px;
    color: white;
}

.header-content {
    animation: fadeInDown 0.8s ease;
}

.header-content i {
    font-size: 3.5rem;
    margin-bottom: 20px;
    display: block;
    animation: bounce 2s infinite;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    font-weight: 300;
    opacity: 0.9;
}

/* Calculator Card */
.calculator-card {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease;
}

/* Info Box */
.info-box {
    background: linear-gradient(135deg, #667eea20 0%, #764ba220 100%);
    border-left: 4px solid var(--secondary-color);
    padding: 20px;
    border-radius: 10px;
    margin-bottom: 30px;
    display: flex;
    align-items: start;
    gap: 15px;
}

.info-box i {
    color: var(--secondary-color);
    font-size: 1.5rem;
    flex-shrink: 0;
    margin-top: 2px;
}

.info-box p {
    margin: 0;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Form Styles */
.input-group {
    margin-bottom: 25px;
}

.input-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-dark);
    font-size: 1rem;
}

.input-group label i {
    margin-right: 8px;
    color: var(--secondary-color);
}

.input-group input,
.input-group select {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 10px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: white;
}

.input-group input:focus,
.input-group select:focus {
    outline: none;
    border-color: var(--secondary-color);
    box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.1);
}

.input-group input:hover,
.input-group select:hover {
    border-color: var(--secondary-color);
}

.input-with-unit {
    display: flex;
    gap: 10px;
}

.input-with-unit input {
    flex: 1;
}

.input-with-unit select {
    width: 140px;
}

.input-group small {
    display: block;
    margin-top: 5px;
    color: var(--text-light);
    font-size: 0.85rem;
}

/* Buttons */
.calculate-btn,
.reset-btn {
    width: 100%;
    padding: 15px;
    border: none;
    border-radius: 10px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    font-family: inherit;
}

.calculate-btn {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    margin-bottom: 10px;
}

.calculate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(102, 126, 234, 0.4);
}

.calculate-btn:active {
    transform: translateY(0);
}

.reset-btn {
    background: var(--light-bg);
    color: var(--text-dark);
}

.reset-btn:hover {
    background: var(--border-color);
}

/* Results Section */
.results {
    margin-top: 40px;
    padding-top: 40px;
    border-top: 2px solid var(--light-bg);
    animation: fadeIn 0.5s ease;
}

.results.hidden {
    display: none;
}

.results h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 25px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.results h2 i {
    color: var(--secondary-color);
}

/* Result Cards */
.result-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.result-card {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: 25px;
    border-radius: 15px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: transform 0.3s ease;
}

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

.result-card i {
    font-size: 2.5rem;
    margin-bottom: 15px;
    display: block;
}

.vinegar-card {
    background: linear-gradient(135deg, #ffeaa7 0%, #fdcb6e 100%);
}

.vinegar-card i {
    color: #d63031;
}

.water-card {
    background: linear-gradient(135deg, #74b9ff 0%, #0984e3 100%);
}

.water-card i {
    color: #0055a4;
}

.ratio-card {
    background: linear-gradient(135deg, #a29bfe 0%, #6c5ce7 100%);
}

.ratio-card i {
    color: #2d3436;
}

.result-card h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.result-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 10px 0;
}

.result-label {
    font-size: 0.9rem;
    color: var(--text-dark);
    opacity: 0.8;
}

/* Instructions */
.instructions {
    background: var(--light-bg);
    padding: 25px;
    border-radius: 15px;
    margin-bottom: 20px;
}

.instructions h3 {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    color: var(--text-dark);
}

.instructions h3 i {
    color: var(--secondary-color);
}

.instructions ol {
    margin-left: 25px;
}

.instructions li {
    margin-bottom: 10px;
    line-height: 1.6;
}

/* Warning Box */
.warning-box {
    background: linear-gradient(135deg, #fff3cd 0%, #fff8e1 100%);
    border-left: 4px solid var(--warning-color);
    padding: 20px;
    border-radius: 10px;
    display: flex;
    align-items: start;
    gap: 15px;
}

.warning-box i {
    color: var(--warning-color);
    font-size: 1.5rem;
    flex-shrink: 0;
}

.warning-box p {
    margin: 0;
    color: var(--text-dark);
}

/* Info Section */
.info-section {
    background: var(--card-bg);
    border-radius: 20px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 30px;
    animation: fadeInUp 0.8s ease 0.2s both;
}

.info-section h2 {
    font-size: 1.8rem;
    color: var(--text-dark);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.info-section h2 i {
    color: var(--secondary-color);
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.info-item {
    padding: 20px;
    border-radius: 10px;
    background: var(--light-bg);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.info-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.info-item i {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 15px;
    display: block;
}

.info-item h3 {
    font-size: 1.1rem;
    margin-bottom: 10px;
    color: var(--text-dark);
}

.info-item p {
    color: var(--text-light);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Footer */
footer {
    text-align: center;
    padding: 30px 20px;
    color: white;
    font-size: 0.9rem;
}

/* Animations */
@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateY(0);
    }
    40% {
        transform: translateY(-10px);
    }
    60% {
        transform: translateY(-5px);
    }
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 10px;
    }

    header {
        padding: 30px 15px;
    }

    header h1 {
        font-size: 2rem;
    }

    .header-content i {
        font-size: 2.5rem;
    }

    .calculator-card,
    .info-section {
        padding: 25px 20px;
    }

    .result-cards {
        grid-template-columns: 1fr;
    }

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

    .input-with-unit {
        flex-direction: column;
    }

    .input-with-unit select {
        width: 100%;
    }

    .result-value {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.6rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    .calculator-card,
    .info-section {
        padding: 20px 15px;
    }

    .results h2,
    .info-section h2 {
        font-size: 1.4rem;
    }
}