:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #0ea5e9;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --danger-color: #ef4444;
    --text-dark: #1f2937;
    --text-medium: #4b5563;
    --text-light: #9ca3af;
    --bg-light: #f9fafb;
    --bg-white: #ffffff;
    --border-color: #e5e7eb;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
}

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

body {
    font-family: 'Roboto Condensed', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 40px 20px;
    color: var(--text-dark);
    line-height: 1.6;
}

/* Container */
.container {
    max-width: 900px;
    margin: 0 auto;
    background: var(--bg-white);
    padding: 40px;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Main Heading */
h1 {
    text-align: center;
    color: var(--primary-color);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
    text-transform: uppercase;
    letter-spacing: 1px;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

h2 {
    color: var(--text-dark);
    font-size: 1.75rem;
    font-weight: 600;
    margin-bottom: 20px;
    border-left: 4px solid var(--primary-color);
    padding-left: 15px;
}

h3 {
    color: var(--text-dark);
    font-size: 1.3rem;
    font-weight: 600;
    margin: 25px 0 15px 0;
}

/* AI Working Section */
.ai-working {
    background: linear-gradient(135deg, #e0f2fe 0%, #dbeafe 100%);
    border-left: 5px solid var(--secondary-color);
    padding: 25px;
    margin: 30px 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

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

.ai-working h3 {
    color: var(--secondary-color);
    margin-top: 0;
    font-size: 1.4rem;
}

.ai-working p {
    color: var(--text-medium);
    margin-bottom: 15px;
    font-size: 1.05rem;
}

.ai-working ul {
    list-style: none;
    padding-left: 0;
}

.ai-working ul li {
    padding: 10px 0;
    padding-left: 30px;
    position: relative;
    color: var(--text-dark);
    font-size: 1.05rem;
}

.ai-working ul li::before {
    content: "💧";
    position: absolute;
    left: 0;
    font-size: 1.2rem;
}

/* Form Section */
.form-section {
    background: var(--bg-light);
    padding: 30px;
    border-radius: var(--radius-md);
    margin: 30px 0;
    border: 1px solid var(--border-color);
}

label {
    display: block;
    font-weight: 600;
    color: var(--text-dark);
    margin-bottom: 8px;
    margin-top: 20px;
    font-size: 1.05rem;
}

label:first-of-type {
    margin-top: 0;
}

input[type="date"],
input[type="number"],
select {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background: var(--bg-white);
    color: var(--text-dark);
}

input[type="date"]:focus,
input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

input[type="date"]:hover,
input[type="number"]:hover,
select:hover {
    border-color: var(--primary-dark);
}

small {
    display: block;
    margin-top: 5px;
    font-size: 0.875rem;
}

/* Checkbox Styling */
.checkbox-label {
    display: flex;
    align-items: center;
    cursor: pointer;
    user-select: none;
    margin-top: 20px;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    margin-right: 10px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

/* Button Styling */
button {
    width: 100%;
    padding: 16px;
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.125rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 30px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: linear-gradient(135deg, var(--primary-dark), #1e3a8a);
}

button:active {
    transform: translateY(0);
    box-shadow: var(--shadow-sm);
}

button:disabled {
    background: var(--text-light);
    cursor: not-allowed;
    transform: none;
}

/* Result Box */
.result-box {
    background: linear-gradient(135deg, #f0fdf4 0%, #dcfce7 100%);
    border: 2px solid var(--success-color);
    padding: 35px;
    border-radius: var(--radius-lg);
    margin-top: 40px;
    display: none;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.result-box.show {
    display: block;
}

/* Big Number Display */
.big-number {
    text-align: center;
    font-size: 4rem;
    font-weight: 700;
    color: var(--success-color);
    margin: 20px 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
    animation: scaleIn 0.6s ease-out;
}

@keyframes scaleIn {
    from {
        transform: scale(0.5);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Info Boxes */
.info-box {
    background: var(--bg-white);
    padding: 15px 20px;
    margin: 12px 0;
    border-radius: var(--radius-sm);
    border-left: 4px solid var(--primary-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

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

.info-box b {
    color: var(--text-dark);
    font-weight: 600;
}

.info-box span {
    color: var(--primary-color);
    font-weight: 600;
    font-size: 1.1rem;
}

/* Alert Box */
#alertBox {
    margin: 25px 0;
    padding: 15px 20px;
    border-radius: var(--radius-sm);
    font-weight: 500;
    animation: fadeIn 0.4s ease-out;
}

#alertBox.alert-warning {
    background: #fef3c7;
    border-left: 4px solid var(--warning-color);
    color: #92400e;
}

#alertBox.alert-danger {
    background: #fee2e2;
    border-left: 4px solid var(--danger-color);
    color: #991b1b;
}

#alertBox.alert-success {
    background: #d1fae5;
    border-left: 4px solid var(--success-color);
    color: #065f46;
}

/* Tables */
table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
    background: var(--bg-white);
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

th {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: white;
    padding: 15px;
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 0.5px;
}

td {
    padding: 15px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-medium);
}

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

tr:hover {
    background: var(--bg-light);
}

/* History Section */
.section {
    background: var(--bg-white);
    padding: 30px;
    border-radius: var(--radius-md);
    margin-top: 30px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

#historySection.show {
    display: block;
    animation: fadeIn 0.5s ease-out;
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: 20px 10px;
    }

    .container {
        padding: 25px 20px;
    }

    h1 {
        font-size: 1.8rem;
    }

    h2 {
        font-size: 1.4rem;
    }

    h3 {
        font-size: 1.2rem;
    }

    .big-number {
        font-size: 3rem;
    }

    .ai-working,
    .form-section {
        padding: 20px;
    }

    .info-box {
        flex-direction: column;
        align-items: flex-start;
        gap: 8px;
    }

    table {
        font-size: 0.9rem;
    }

    th, td {
        padding: 10px;
    }
}

@media (max-width: 480px) {
    h1 {
        font-size: 1.5rem;
    }

    .big-number {
        font-size: 2.5rem;
    }

    button {
        font-size: 1rem;
        padding: 14px;
    }
}

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

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

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: var(--bg-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-dark);
}

/* Print Styles */
@media print {
    body {
        background: white;
        padding: 0;
    }

    .container {
        box-shadow: none;
        max-width: 100%;
    }

    .form-section,
    button {
        display: none;
    }
}