:root {
    --primary-color-light: #4dabf7; /* Brighter Blue */
    --secondary-color-light: #228be6; /* Stronger Blue */
    --text-color-light: #212529;
    --bg-color-light: #f1f3f5;
    --card-bg-light: rgba(255, 255, 255, 0.85);

    --primary-color-dark: #1c7ed6;
    --secondary-color-dark: #4dabf7;
    --text-color-dark: #e9ecef;
    --bg-color-dark: #121212; /* Darker background */
    --card-bg-dark: rgba(33, 37, 41, 0.85);

    --shadow-color: rgba(0, 0, 0, 0.1);
    --shadow-color-dark: rgba(0, 0, 0, 0.5);

    --font-main: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

body {
    font-family: var(--font-main);
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: background-color 0.4s, color 0.4s;
}

body.light-mode {
    background-color: var(--bg-color-light);
    color: var(--text-color-light);
}

body.dark-mode {
    background-color: var(--bg-color-dark);
    color: var(--text-color-dark);
}

header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    background-color: var(--card-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

body.dark-mode header {
    background-color: var(--card-bg-dark);
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

header h1 a {
    margin: 0;
    color: inherit;
    text-decoration: none;
    font-size: 1.6rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
}

header h1 .fa-person-running {
    color: var(--primary-color-light);
}

body.dark-mode header h1 .fa-person-running {
    color: var(--primary-color-dark);
}

header nav ul {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 1.5rem;
}

header nav a {
    text-decoration: none;
    color: inherit;
    font-weight: 500;
    padding-bottom: 5px;
    position: relative;
}

header nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color-light);
    transition: width 0.3s ease-out;
}

body.dark-mode header nav a::after {
    background-color: var(--secondary-color-dark);
}

header nav a:hover::after, header nav a.active::after {
    width: 100%;
}

/* --- Hero Section --- */
.hero-section {
    text-align: center;
    padding: 4rem 2rem;
    margin: 0 auto;
    width: 100%;
    background: linear-gradient(135deg, var(--primary-color-light), var(--secondary-color-light));
    color: white;
}

body.dark-mode .hero-section {
    background: linear-gradient(135deg, var(--primary-color-dark), #0b3966);
}

.hero-section h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin: 0 0 1rem 0;
    line-height: 1.3;
}

.hero-section p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
    opacity: 0.9;
}

main {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 2rem;
    gap: 2.5rem; /* Increased gap */
}

.container-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
}

.container-header .fa-solid {
    font-size: 1.5rem;
    color: var(--primary-color-light);
}

body.dark-mode .container-header .fa-solid {
    color: var(--primary-color-dark);
}

.container-header h2 {
    margin: 0;
    font-size: 1.8rem;
    font-weight: 700;
}

.info-container, .meal-container, .action-container, .result-container, .contact-container, .disqus-container, .legal-page, .about-page, .article-list-page, .article-content {
    width: 100%;
    max-width: 800px;
    padding: 2.5rem;
    border-radius: 20px; /* Smoother radius */
    box-shadow: 0 8px 32px var(--shadow-color);
    background-color: var(--card-bg-light);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
    color: var(--text-color-light); /* FIX: Explicitly set text color */
}

.info-container:hover, .meal-container:hover, .result-container:hover, .contact-container:hover {
    transform: translateY(-5px);
}

body.dark-mode .info-container, body.dark-mode .meal-container, body.dark-mode .action-container, body.dark-mode .result-container, body.dark-mode .contact-container, body.dark-mode .disqus-container, body.dark-mode .legal-page, body.dark-mode .about-page, body.dark-mode .article-list-page, body.dark-mode .article-content {
    background-color: var(--card-bg-dark);
    box-shadow: 0 8px 32px var(--shadow-color-dark);
    border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-color-dark); /* FIX: Explicitly set text color for dark mode */
}

.info-inputs {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.meal-inputs {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

input, select, textarea {
    width: 100%;
    padding: 1rem;
    border-radius: 10px;
    border: 1px solid #ced4da;
    background-color: #fff;
    font-family: var(--font-main);
    font-size: 1rem;
    transition: border-color 0.2s, box-shadow 0.2s;
    margin-top: 0; /* Removed margin-top */
}

body.dark-mode input, body.dark-mode select, body.dark-mode textarea {
    background-color: #2c2c2c;
    border-color: #444;
    color: var(--text-color-dark);
}

input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary-color-light);
    box-shadow: 0 0 0 3px rgba(77, 171, 247, 0.3);
}

#add-meal-btn, .contact-container button {
    padding: 0.75rem 1.5rem;
    border-radius: 10px;
    border: none;
    cursor: pointer;
    background-color: var(--primary-color-light);
    color: white;
    transition: background-color 0.3s, transform 0.2s;
    font-weight: 600;
    font-size: 1rem;
}

#calculate-btn {
    width: 100%;
    padding: 1.25rem 2rem;
    border-radius: 12px;
    border: none;
    cursor: pointer;
    background: linear-gradient(135deg, #1971c2, #364fc7);
    color: white;
    font-size: 1.2rem;
    font-weight: 700;
    transition: transform 0.2s, box-shadow 0.2s;
    box-shadow: 0 4px 15px rgba(25, 113, 194, 0.4);
}

body.dark-mode #calculate-btn {
     background: linear-gradient(135deg, var(--secondary-color-dark), var(--primary-color-dark));
     box-shadow: 0 4px 20px rgba(77, 171, 247, 0.3);
}

#add-meal-btn:hover, .contact-container button:hover {
    transform: translateY(-2px);
    background-color: var(--secondary-color-light);
}

#calculate-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(25, 113, 194, 0.5);
}

#meal-list {
    list-style: none;
    padding: 0;
    margin-top: 1.5rem;
}

#meal-list li {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 0.5rem;
    background-color: var(--bg-color-light);
}

body.dark-mode #meal-list li {
    background-color: #2a2a2a;
}

.result-container {
    display: none;
    text-align: center;
}

.legal-page, .about-page, .article-list-page, .article-content {
    line-height: 1.8;
}

.legal-page h2, .about-page h2, .article-list-page h2, .article-header h2 {
    border-bottom: 2px solid var(--primary-color-light); /* FIX: Correct color for light mode */
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
}

body.dark-mode .legal-page h2,
body.dark-mode .about-page h2,
body.dark-mode .article-list-page h2,
body.dark-mode .article-header h2 {
    border-bottom-color: var(--primary-color-dark); /* FIX: Correct color for dark mode */
}

.article-list .article-item {
    margin-bottom: 2rem;
    border-bottom: 1px solid #dee2e6;
    padding-bottom: 1.5rem;
}

body.dark-mode .article-list .article-item {
    border-bottom-color: #495057;
}

.article-list .article-item:last-child {
    border-bottom: none;
}

.article-list h3 a {
    color: inherit;
    text-decoration: none;
    font-weight: 600;
}

.article-list h3 a:hover {
    color: var(--secondary-color-light);
}

body.dark-mode .article-list h3 a:hover {
    color: var(--secondary-color-dark);
}

.article-meta {
    color: #868e96;
    font-size: 0.9rem;
}

footer {
    text-align: center;
    padding: 2rem 1rem;
    background-color: transparent; /* Cleaner look */
    margin-top: auto;
    color: #868e96;
}

footer a {
    color: #868e96;
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
    color: var(--primary-color-light);
}

body.dark-mode footer, body.dark-mode footer a {
    color: #adb5bd;
}

body.dark-mode footer a:hover {
    color: var(--primary-color-dark);
}

@media (max-width: 768px) {
    header { flex-direction: column; padding: 1rem; text-align: center; }
    header nav { margin-top: 1rem; }
    .hero-section h2 { font-size: 2rem; }
    main { padding: 1rem; gap: 1.5rem; }
    .info-container, .meal-container, .action-container, .result-container, .contact-container, .disqus-container, .legal-page, .about-page, .article-list-page, .article-content { padding: 1.5rem; }
    .container-header h2 { font-size: 1.5rem; }
}