/* General Body & Typography */
:root {
    --primary-bg: #111827;
    --secondary-bg: #1F2937;
    --card-bg: #374151;
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --accent-color: #6B7280;
    --accent-color-hover: #4B5563;
}

body {
    font-family: 'Inter', sans-serif;
    margin: 0;
    background-color: var(--primary-bg);
    color: var(--text-primary);
    line-height: 1.6;
}

h1, h2, h3, h4 {
    color: var(--text-primary);
    line-height: 1.2;
}

h1 {
    font-size: 3rem;
    font-weight: 700;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 2rem;
}

h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    border-bottom: 2px solid var(--accent-color);
    padding-bottom: 0.5rem;
}

h4 {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
}

p {
    color: var(--text-secondary);
}

.tip-preview {
    height: 60px;
}

a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:hover {
    color: var(--accent-color-hover);
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header */
.main-header {
    background-color: var(--secondary-bg);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.5);
}

.main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.main-header nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
    gap: 2rem;
}

.main-header nav a {
    color: var(--text-secondary);
    font-weight: 600;
}

.main-header nav a:hover {
    color: var(--text-primary);
}

/* Hero Section */
.hero {
    background-color: var(--primary-bg);
    text-align: center;
    padding: 6rem 0;
}

.hero .subtitle {
    font-size: 1.25rem;
    max-width: 600px;
    margin: 1rem auto 2rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--text-primary);
    padding: 0.8rem 2rem;
    border-radius: 5px;
    font-weight: 600;
    transition: background-color 0.3s ease;
}

.cta-button:hover {
    background-color: var(--accent-color-hover);
    color: var(--text-primary);
}


/* Portfolio Section */
.portfolio-container {
    padding: 4rem 0;
    background-color: var(--secondary-bg);
}

.portfolio-category {
    margin-bottom: 4rem;
}

.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.portfolio-item {
    background-color: var(--card-bg);
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex;
    flex-direction: row;
    align-items: center;
}

.portfolio-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 15px rgba(0,0,0,0.2);
}

.portfolio-image-link {
    flex-shrink: 0;
    padding: 1.5rem;
}

.portfolio-image-link img {
    width: 100px;
    height: 100px;
    display: block;
    background-color: #fff;
    border-radius: 8px;
    object-fit: contain;
    padding: 0.5rem;
    box-sizing: border-box;
}

.portfolio-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    padding: 1.5rem;
    padding-left: 0;
}

.portfolio-description {
    font-size: 0.95rem;
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.demo-link {
    background-color: var(--primary-bg);
    color: var(--text-primary);
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-align: center;
    align-self: flex-start;
    transition: background-color 0.3s ease;
}

.demo-link:hover {
    background-color: #4B5563; /* A lighter gray */
}

.portfolio-item.placeholder {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 300px;
    border: 2px dashed var(--text-secondary);
    color: var(--text-secondary);
    background-color: transparent;
    box-shadow: none;
}

/* Productivity Tips Section */
.tips-section {
    padding: 4rem 0;
    background-color: var(--primary-bg);
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.tips-grid .portfolio-item {
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tips-grid .portfolio-content {
    padding: 2rem;
    display: flex;
    flex-direction: column;
    height: 100%;
}

.tips-grid .portfolio-content h4 {
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.tips-grid .tip-preview {
    flex-grow: 1;
    margin-bottom: 1.5rem;
    min-height: 80px;
}

.tips-grid .read-more-button {
    align-self: flex-start;
    margin-top: auto;
}

.tip-item {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
    transition: transform 0.3s ease;
}

.tip-item:hover {
    transform: translateY(-5px);
}

.tip-item h4 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}
.read-more-button {
    background-color: var(--accent-color);
    color: var(--text-primary);
    border: none;
    padding: 0.75rem 1.5rem;
    border-radius: 5px;
    cursor: pointer;
    font-weight: 600;
    text-decoration: none;
    display: inline-block;
    transition: background-color 0.3s ease, transform 0.2s ease;
}
.read-more-button:hover {
    background-color: var(--accent-color-hover);
    color: var(--text-primary);
    transform: translateY(-2px);
}

/* Contact Section */
.contact-section {
    padding: 4rem 0;
    text-align: center;
    background: var(--primary-bg);
}

.contact-section p {
    margin-bottom: 2rem;
}

/* Footer */
footer {
    background-color: var(--secondary-bg);
    color: var(--text-secondary);
    padding: 2rem 0;
    text-align: center;
}

footer .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

footer .footer-links a {
    color: var(--text-secondary);
    margin-left: 1rem;
}

footer .footer-links a:hover {
    color: var(--text-primary);
}


/* Responsive Design */
@media (max-width: 768px) {
    h1 {
        font-size: 2.5rem;
    }

    .main-header .container,
    footer .container {
        flex-direction: column;
        gap: 1rem;
    }

    footer .footer-links {
        margin-top: 1rem;
    }

    .portfolio-item {
        flex-direction: column;
    }

    .portfolio-content {
        padding-left: 1.5rem;
    }
}