/* style.css */

/* CSS Variables for theming */
:root {
    --color-light-bg: #f8f9fa;
    --color-light-text: #212529;
    --color-light-primary: #007bff;
    --color-light-secondary: #6c757d;
    --color-light-accent: #28a745;
    --color-light-card-bg: #ffffff;
    --color-light-border: #dee2e6;
    --color-light-shadow: rgba(0, 0, 0, 0.1);

    --color-dark-bg: #212529;
    --color-dark-text: #f8f9fa;
    --color-dark-primary: #66b3ff;
    --color-dark-secondary: #adb5bd;
    --color-dark-accent: #20c997;
    --color-dark-card-bg: #343a40;
    --color-dark-border: #495057;
    --color-dark-shadow: rgba(0, 0, 0, 0.5);

    /* Current theme variables */
    --bg-color: var(--color-light-bg);
    --text-color: var(--color-light-text);
    --primary-color: var(--color-light-primary);
    --secondary-color: var(--color-light-secondary);
    --accent-color: var(--color-light-accent);
    --card-bg-color: var(--color-light-card-bg);
    --border-color: var(--color-light-border);
    --shadow-color: var(--color-light-shadow);

    /* Form accent color */
    accent-color: var(--primary-color); /* Applies to checkboxes, radio buttons, etc. */
}

/* Dark theme styles */
body.dark-theme {
    --bg-color: var(--color-dark-bg);
    --text-color: var(--color-dark-text);
    --primary-color: var(--color-dark-primary);
    --secondary-color: var(--color-dark-secondary);
    --accent-color: var(--color-dark-accent);
    --card-bg-color: var(--color-dark-card-bg);
    --border-color: var(--color-dark-border);
    --shadow-color: var(--color-dark-shadow);
}

/* General Body Styles */
body {
    margin: 0;
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.6;
    transition: background-color 0.3s ease, color 0.3s ease;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Global focus styles for accessibility */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
    border-radius: 4px;
}

/* Header Styles */
.header {
    background-color: var(--card-bg-color);
    color: var(--text-color);
    padding: 1rem 0;
    box-shadow: 0 2px 10px var(--shadow-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    transition: background-color 0.3s ease, box-shadow 0.3s ease;
}

.header__content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
    display: flex;
    flex-wrap: wrap; /* Allow wrapping on smaller screens */
    justify-content: space-between;
    align-items: center;
    gap: 1rem; /* Space between items */
}

.header__title {
    margin: 0;
    font-size: 1.8rem;
    color: var(--primary-color);
}

.header__nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
}

.header__nav-link {
    color: var(--text-color);
    text-decoration: none;
    font-weight: 600;
    padding: 0.5rem 0;
    position: relative;
    transition: color 0.3s ease;
}

.header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: width 0.3s ease;
}

.header__nav-link:hover::after,
.header__nav-link:focus-visible::after {
    width: 100%;
}

.header__nav-link:hover,
.header__nav-link:focus-visible {
    color: var(--primary-color);
}

.theme-toggle {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 25px;
    cursor: pointer;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 8px var(--shadow-color);
}

.theme-toggle:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

.theme-toggle:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow-color);
}

/* Main Content Area */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 4rem; /* Space between sections */
}

/* Challenge Section */
.challenge-section {
    background-color: var(--card-bg-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 6px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    text-align: center;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.challenge-section__title {
    color: var(--primary-color);
    font-size: 2.2rem;
    margin-bottom: 1rem;
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.challenge-section__text {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.challenge-section__concepts {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 0.75rem 1.5rem;
    font-size: 0.95rem;
    color: var(--secondary-color);
}

.challenge-section__concepts li strong {
    color: var(--primary-color);
}

/* General Section Styles */
.section {
    background-color: var(--card-bg-color);
    border-radius: 12px;
    padding: 2rem;
    box-shadow: 0 6px 15px var(--shadow-color);
    border: 1px solid var(--border-color);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    /* Enable container queries for sections */
    container-type: inline-size;
    container-name: section-container;
}

.section__title {
    color: var(--primary-color);
    font-size: 2rem;
    text-align: center;
    margin-bottom: 2rem;
}

/* About Section Specifics */
.section--about {
    /* Using :has() selector - if the section has an image, adjust padding */
    &:has(.about__image) {
        padding-bottom: 3rem; /* Example adjustment */
    }
}

.about__grid {
    display: grid;
    gap: 2rem;
    align-items: center;
    /* Default for larger screens */
    grid-template-columns: 1fr 2fr;
}

.about__image-wrapper {
    text-align: center;
}

.about__image {
    width: 100%;
    max-width: 250px;
    height: auto;
    border-radius: 50%;
    border: 4px solid var(--primary-color);
    box-shadow: 0 4px 10px var(--shadow-color);
    transition: transform 0.3s ease;
}

.about__image:hover {
    transform: scale(1.03);
}

.about__text p {
    margin-bottom: 1rem;
    font-size: 1.05rem;
}

/* Projects Section Specifics */
.projects__grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--card-bg-color);
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 12px var(--shadow-color);
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.project-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px var(--shadow-color);
}

.project-card__image {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-bottom: 1px solid var(--border-color);
}

.project-card__title {
    font-size: 1.4rem;
    color: var(--primary-color);
    margin: 1rem 1.5rem 0.5rem;
}

.project-card__description {
    font-size: 0.95rem;
    color: var(--secondary-color);
    padding: 0 1.5rem 1rem;
    flex-grow: 1; /* Allows description to take available space */
}

.project-card__actions {
    display: flex;
    justify-content: flex-end;
    gap: 0.75rem;
    padding: 0.75rem 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    margin-top: auto; /* Pushes actions to the bottom */
}

.project-card__link {
    background-color: var(--primary-color);
    color: #fff;
    text-decoration: none;
    padding: 0.6rem 1rem;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 2px 5px var(--shadow-color);
}

.project-card__link:hover,
.project-card__link:focus-visible {
    background-color: var(--accent-color);
    transform: translateY(-1px);
}

/* Contact Section Specifics */
.contact__intro {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: var(--secondary-color);
}

.contact__form {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group__label {
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: var(--primary-color);
}

.form-group__input,
.form-group__textarea {
    padding: 0.8rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    background-color: var(--bg-color); /* Ensure input background matches theme */
    color: var(--text-color);
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group__input:focus,
.form-group__textarea:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 123, 255, 0.25);
    outline: none;
}

.form-group__textarea {
    resize: vertical; /* Allow vertical resizing */
    min-height: 120px;
}

.contact__submit-button {
    background-color: var(--primary-color);
    color: #fff;
    border: none;
    padding: 1rem 1.5rem;
    border-radius: 25px;
    cursor: pointer;
    font-size: 1.1rem;
    font-weight: 700;
    transition: background-color 0.3s ease, transform 0.2s ease, box-shadow 0.3s ease;
    box-shadow: 0 4px 8px var(--shadow-color);
    align-self: center; /* Center the button */
    width: fit-content;
}

.contact__submit-button:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

.contact__submit-button:active {
    transform: translateY(0);
    box-shadow: 0 2px 4px var(--shadow-color);
}

/* Footer Styles */
.footer {
    background-color: var(--card-bg-color);
    color: var(--secondary-color);
    text-align: center;
    padding: 1.5rem 1.5rem;
    border-top: 1px solid var(--border-color);
    box-shadow: 0 -2px 10px var(--shadow-color);
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    align-items: center;
    justify-content: center;
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.footer__text {
    margin: 0;
    font-size: 0.9rem;
}

.footer__back-button {
    display: inline-block;
    background-color: var(--primary-color);
    color: #fff;
    text-decoration: none;
    padding: 0.75rem 1.5rem;
    border-radius: 25px;
    font-weight: 600;
    transition: background-color 0.3s ease, transform 0.2s ease;
    box-shadow: 0 4px 8px var(--shadow-color);
}

.footer__back-button:hover,
.footer__back-button:focus-visible {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

/* =======================================
   Responsive Design with Media Queries
   ======================================= */

/* Small screens (e.g., mobile phones) */
@media (max-width: 768px) {
    .header__content {
        flex-direction: column;
        text-align: center;
    }

    .header__nav-list {
        flex-direction: column;
        gap: 0.75rem;
        margin-top: 1rem;
    }

    .header__nav-link {
        padding: 0.25rem 0;
    }

    .theme-toggle {
        width: 100%;
        margin-top: 1rem;
    }

    .main-content {
        padding: 1.5rem 1rem;
        gap: 3rem;
    }

    .challenge-section__title {
        font-size: 1.8rem;
    }

    .challenge-section__text {
        font-size: 1rem;
    }

    .section__title {
        font-size: 1.8rem;
        margin-bottom: 1.5rem;
    }

    .about__grid {
        grid-template-columns: 1fr; /* Stack on small screens */
        text-align: center;
    }

    .about__image {
        max-width: 200px;
    }

    .projects__grid {
        grid-template-columns: 1fr; /* Stack project cards */
    }

    .project-card__title {
        font-size: 1.2rem;
    }

    .project-card__description {
        font-size: 0.9rem;
    }

    .project-card__actions {
        justify-content: center;
    }

    .contact__form {
        padding: 0 1rem;
    }

    .contact__submit-button {
        width: 80%;
    }
}

/* Medium screens (e.g., tablets) */
@media (min-width: 769px) and (max-width: 1024px) {
    .header__content {
        padding: 0 1rem;
    }

    .main-content {
        padding: 2rem 1.5rem;
    }

    .about__grid {
        grid-template-columns: 1fr 1.5fr; /* Slightly adjust for tablets */
    }

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

/* =======================================
   Container Queries
   ======================================= */
/* Applies to any element with container-type: inline-size and container-name: section-container */

@container section-container (max-width: 600px) {
    /* Adjustments for sections when their *own width* is less than 600px */

    .section__title {
        font-size: 1.6rem;
        margin-bottom: 1.2rem;
    }

    /* About section specific container query */
    .section--about .about__grid {
        grid-template-columns: 1fr; /* Stack image and text within about section */
        text-align: center;
    }

    /* Projects section specific container query */
    .section--projects .project-card {
        padding: 1rem; /* Smaller padding for cards in narrow containers */
    }

    .section--projects .project-card__title {
        font-size: 1.1rem;
        margin: 0.75rem 1rem 0.25rem;
    }

    .section--projects .project-card__description {
        font-size: 0.85rem;
        padding: 0 1rem 0.75rem;
    }

    .section--projects .project-card__actions {
        padding: 0.5rem 1rem 1rem;
        gap: 0.5rem;
    }

    .section--projects .project-card__link {
        padding: 0.5rem 0.8rem;
        font-size: 0.8rem;
    }

    /* Contact section specific container query */
    .section--contact .contact__form {
        gap: 1rem;
    }
}

/* :has() selector example (CSS Nesting used here) */
/* If a section has a title, apply a specific top padding */
.section:has(.section__title) {
    padding-top: 2.5rem;
}