/* --- Base Styles & Variables --- */
:root {
    --bg-color-light: #f4f7f6;
    --text-color-light: #333;
    --card-bg-light: #ffffff;
    --primary-color-light: #007bff; /* Blue */
    --secondary-color-light: #6c757d; /* Gray */
    --border-color-light: #dee2e6;
    --input-bg-light: #fff;
    --input-text-light: #495057;
    --error-color-light: #dc3545;

    --bg-color-dark: #212529;
    --text-color-dark: #e9ecef;
    --card-bg-dark: #343a40;
    --primary-color-dark: #0d6efd; /* Slightly brighter blue for dark */
    --secondary-color-dark: #adb5bd; /* Lighter gray for dark */
    --border-color-dark: #495057;
    --input-bg-dark: #495057;
    --input-text-dark: #f8f9fa;
    --error-color-dark: #f86c6b; /* Lighter red */

    --border-radius: 8px;
    --box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition-speed: 0.3s ease;
}

/* Apply theme variables */
body[data-theme="light"] {
    --bg-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --card-bg: var(--card-bg-light);
    --primary-color: var(--primary-color-light);
    --secondary-color: var(--secondary-color-light);
    --border-color: var(--border-color-light);
    --input-bg: var(--input-bg-light);
    --input-text: var(--input-text-light);
    --error-color: var(--error-color-light);
}

body[data-theme="dark"] {
    --bg-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --card-bg: var(--card-bg-dark);
    --primary-color: var(--primary-color-dark);
    --secondary-color: var(--secondary-color-dark);
    --border-color: var(--border-color-dark);
    --input-bg: var(--input-bg-dark);
    --input-text: var(--input-text-dark);
    --error-color: var(--error-color-dark);
}

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

body {
    font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    display: flex;
    justify-content: center;
    align-items: flex-start; /* Align top */
    min-height: 100vh;
    padding: 20px;
    transition: background-color var(--transition-speed), color var(--transition-speed);
}

.container {
    background-color: var(--card-bg);
    padding: 30px 40px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    max-width: 800px;
    width: 100%;
    transition: background-color var(--transition-speed);
}

/* --- Header & Theme Toggle --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
}

header h1 {
    font-size: 1.8em;
    color: var(--primary-color);
    margin: 0;
}

#theme-toggle {
    background: none;
    border: 1px solid var(--secondary-color);
    color: var(--secondary-color);
    cursor: pointer;
    padding: 8px 10px;
    border-radius: 50%; /* Make it circular */
    font-size: 1.1em;
    transition: background-color var(--transition-speed), color var(--transition-speed), border-color var(--transition-speed);
    width: 40px;
    height: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
}
#theme-toggle:hover {
    background-color: var(--secondary-color);
    color: var(--card-bg);
}
#theme-toggle i { /* For Font Awesome icon */
    pointer-events: none; /* Ensure icon doesn't capture click */
}


/* --- Form Styles --- */
#macro-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-row {
    display: flex;
    gap: 20px;
    flex-wrap: wrap; /* Wrap on smaller screens */
}

.input-group {
    flex: 1; /* Each group takes equal space */
    min-width: 200px; /* Prevent excessive shrinking */
    display: flex;
    flex-direction: column;
}

.input-group label {
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--text-color);
    font-size: 0.95em;
}

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

.input-with-unit input {
    flex-grow: 1; /* Input takes available space */
    border-right: none;
    border-top-right-radius: 0;
    border-bottom-right-radius: 0;
}
/* Target specifically number inputs if needed, or keep general */
input[type="number"],
select {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    background-color: var(--input-bg);
    color: var(--input-text);
    font-size: 1em;
    transition: border-color var(--transition-speed), background-color var(--transition-speed);
}

input:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(var(--primary-color-rgb, 0, 123, 255), 0.25); /* Add focus ring */
}
/* Add placeholder styles if you use them */

/* Style number input arrows (optional) */
input[type="number"]::-webkit-inner-spin-button,
input[type="number"]::-webkit-outer-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
input[type="number"] {
  -moz-appearance: textfield; /* Firefox */
}


.unit-toggle {
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    background-color: var(--secondary-color);
    color: var(--bg-color); /* Use background color for text */
    cursor: pointer;
    border-left: none;
    border-top-left-radius: 0;
    border-bottom-left-radius: 0;
    border-top-right-radius: var(--border-radius);
    border-bottom-right-radius: var(--border-radius);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
    font-weight: 500;
    white-space: nowrap; /* Prevent text wrapping */
}
.unit-toggle:hover {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.cta-button {
    padding: 15px 20px;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    font-size: 1.1em;
    font-weight: 600;
    transition: background-color var(--transition-speed), transform 0.1s ease;
    margin-top: 10px; /* Add space above button */
}
.cta-button:hover {
    background-color: darken(var(--primary-color), 10%); /* Needs JS or manual dark color */
    /* Manual dark equivalent: */
    background-color: #0056b3; /* Adjust dark mode primary color hover too */
    transform: translateY(-1px);
}
body[data-theme="dark"] .cta-button:hover {
     background-color: #0b5ed7;
}

.cta-button:active {
    transform: translateY(0px);
}


/* --- Results Styles --- */
#results {
    margin-top: 35px;
    padding-top: 25px;
    border-top: 1px solid var(--border-color);
}

#results h2 {
    text-align: center;
    margin-bottom: 20px;
    color: var(--primary-color);
}

#results p {
    margin-bottom: 10px;
    font-size: 1.1em;
}
#results strong {
    font-weight: 600;
    color: var(--text-color);
}

.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); /* Responsive grid */
    gap: 25px;
    margin-top: 20px;
    margin-bottom: 30px;
}

.result-pace {
    background-color: var(--bg-color); /* Slightly different background */
    padding: 20px;
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    transition: background-color var(--transition-speed), border-color var(--transition-speed);
}

.result-pace h3 {
    margin-bottom: 15px;
    color: var(--primary-color);
    font-size: 1.2em;
    text-align: center;
    border-bottom: 1px dashed var(--secondary-color);
    padding-bottom: 8px;
}

.result-pace ul {
    list-style: none;
    padding: 0;
}

.result-pace li {
    margin-bottom: 8px;
    font-size: 0.95em;
}
.result-pace li strong {
     min-width: 40px; /* Align numbers slightly */
     display: inline-block;
}
.result-pace li span { /* Percentage span */
    color: var(--secondary-color);
}

.water-intake {
    text-align: center;
    margin-top: 20px;
    padding: 15px;
    background-color: var(--bg-color);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
}
.water-intake h3 {
     margin-bottom: 10px;
     font-size: 1.1em;
     color: var(--secondary-color);
}
.water-intake p {
    font-size: 1.2em;
    margin: 0;
}


/* --- Utility Classes --- */
.hidden {
    display: none !important; /* Use important only if necessary */
}

.error {
    color: var(--error-color);
    font-weight: bold;
    margin-top: 10px;
    text-align: center;
}

/* --- Disclaimer --- */
.disclaimer {
    margin-top: 30px;
    padding-top: 15px;
    border-top: 1px dashed var(--secondary-color);
    font-size: 0.85em;
    color: var(--secondary-color);
}
.disclaimer h3 {
    font-size: 1em;
    color: var(--secondary-color);
    margin-bottom: 5px;
}


/* --- Responsive Adjustments --- */
@media (max-width: 768px) {
    .container {
        padding: 20px;
    }
    header h1 {
        font-size: 1.5em;
    }
     .input-row {
        flex-direction: column; /* Stack inputs vertically */
        gap: 15px;
    }
    .input-group {
         min-width: 100%; /* Full width on small screens */
    }
    .results-grid {
        grid-template-columns: 1fr; /* Single column on small screens */
        gap: 15px;
    }
}

@media (max-width: 480px) {
     header {
         flex-direction: column;
         align-items: flex-start;
         gap: 10px;
     }
     #theme-toggle {
         align-self: flex-end; /* Keep toggle to the right */
     }
      header h1 {
        font-size: 1.3em;
    }
    .container {
        padding: 15px;
    }
}