/* General Styles */
:root {
    --primary-bg: #ffffff;
    --secondary-bg: #f4f4f4;
    --text-color: #000000;
    --medium-gray: #cccccc;
    --shadow-light: rgba(0, 0, 0, 0.15);
    --shadow-dark: rgba(0, 0, 0, 0.3);
    --border-radius: 8px;
    --transition-speed: 0.3s ease;
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --primary-bg: #1a1a1a;
        --secondary-bg: #2a2a2a;
        --text-color: #ffffff;
        --medium-gray: #666666;
        --shadow-light: rgba(255, 255, 255, 0.08);
        --shadow-dark: rgba(255, 255, 255, 0.15);
    }
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    background-color: var(--primary-bg);
    color: var(--text-color);
    scroll-behavior: smooth;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Header */
.header {
    position: fixed;
    width: 100%;
    background-color: var(--primary-bg);
    box-shadow: 0 2px 10px var(--shadow-light);
    z-index: 1000;
    padding: 1rem 0;
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

.navbar .nav-link:first-child { /* Kauê's name */
    font-weight: bold;
    font-size: 1.5rem;
    color: var(--text-color);
}

.nav-list {
    list-style: none;
    display: flex;
}

.nav-list li {
    margin-left: 2rem;
}

.nav-list .nav-link {
    color: var(--text-color);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 1rem; /* Add padding to make them feel like cards */
    border-radius: var(--border-radius);
    transition: all var(--transition-speed);
}

.nav-list .nav-link:hover {
    background-color: var(--secondary-bg); /* Light background on hover */
    transform: translateY(-3px); /* Slight lift */
    box-shadow: 0 4px 10px var(--shadow-light); /* Subtle shadow */
}

/* Remove the underline animation as it conflicts with the card-like hover */
.nav-list .nav-link::after {
    display: none;
}

/* Sections */
.section {
    padding: 8rem 2rem;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    opacity: 0; /* Initial hidden state for fade-in */
    transform: translateY(20px); /* Initial position for slide-up effect */
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.section.visible {
    opacity: 1;
    transform: translateY(0);
}

.intro-section {
    background-color: var(--primary-bg);
}

.intro-section h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
}

.intro-section p {
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 2rem;
}

.skills-section {
    background-color: var(--secondary-bg);
}

.skills-section h2,
.certificates-section h2,
.projects-section h2,
.github-repos-section h2,
.contact-section h2 {
    font-size: 2.5rem;
    margin-bottom: 1.5rem; /* Reduced margin for compactness */
}

.github-repos-section #toggle-repos {
    margin-bottom: 2rem; /* Space between button and grid */
}

.skills-grid,
.certificates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
}

.skill-card,
.certificate-card {
    background-color: var(--primary-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
}

.skill-card:hover,
.certificate-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-dark); /* Darker shadow on hover */
}

.skill-card .icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.skill-card h3,
.certificate-card h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.skill-card p,
.certificate-card p {
    font-size: 1rem;
    color: var(--text-color);
}

.certificates-section {
    background-color: var(--primary-bg);
}

.projects-section {
    background-color: var(--secondary-bg); /* Alternating background */
}

.projects-grid,
.repos-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    max-width: 1200px;
    width: 100%;
    transition: max-height 0.7s ease-out, opacity 0.7s ease-out; /* Smooth transition for collapse */
    max-height: 1000px; /* Default max height when expanded, adjust as needed */
    overflow: hidden;
    opacity: 1;
}

.repos-grid.collapsed {
    max-height: 0;
    opacity: 0;
    margin-bottom: 0; /* Remove margin when collapsed */
}

.project-card,
.repo-card {
    background-color: var(--secondary-bg);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 15px var(--shadow-light);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.project-card:hover,
.repo-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px var(--shadow-dark); /* Darker shadow on hover */
}

.project-card h3,
.repo-card h3 {
    font-size: 1.8rem;
    margin-bottom: 0.8rem;
}

.project-card p,
.repo-card p {
    font-size: 1.1rem;
    color: var(--text-color);
    margin-bottom: 1.5rem;
    flex-grow: 1;
}

.github-repos-section {
    background-color: var(--primary-bg); /* Alternating background */
}

.contact-section {
    background-color: var(--secondary-bg); /* Alternating background */
}

.contact-section h2 {
    margin-bottom: 2rem;
}

.contact-buttons {
    display: flex;
    gap: 0; /* Gap will be handled by button-wrapper margin */
    flex-wrap: wrap;
    justify-content: center;
}

/* Button Wrapper for layered effect */
.button-wrapper {
    position: relative;
    display: inline-block;
    margin: 0 0.75rem; /* Spacing between buttons */
}

.button-back-box {
    position: absolute;
    top: 5px; /* Offset for depth */
    left: 5px; /* Offset for depth */
    width: 100%;
    height: 100%;
    background-color: var(--text-color); /* Black box behind */
    border-radius: var(--border-radius);
    z-index: 1; /* Behind the actual button */
    transition: transform var(--transition-speed); /* For potential future animations */
}

/* Buttons (NG.CASH inspired, light theme) */
.btn {
    display: inline-block;
    padding: 1rem 2.5rem;
    border-radius: var(--border-radius);
    font-weight: bold;
    font-size: 1.1rem;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 1px solid var(--text-color); /* Mini outline preta */
    background-color: var(--primary-bg); /* Botão branco */
    color: var(--text-color); /* Texto preto */
    position: relative; /* Important for z-index within wrapper */
    z-index: 2; /* Ensure button is above the back box */
    transition: transform var(--transition-speed);
    transform: translate(-5px, -5px); /* Default "inactive" (lifted) position */
}

.button-wrapper:hover .btn {
    transform: translate(-8px, -8px); /* Lift button even further on hover */
}

.button-wrapper.button-active-state .btn {
    transform: translate(5px, 5px); /* "Active" (pressed) position */
}

.button-wrapper:active .btn {
    transform: translate(5px, 5px); /* "Encostar" na box */
}

/* Ensure project-card buttons are centered */
.project-card .button-wrapper {
    margin-top: auto; /* Push button to bottom */
}

/* Footer */
.footer {
    background-color: var(--primary-bg);
    color: var(--medium-gray);
    text-align: center;
    padding: 2rem;
    font-size: 0.9rem;
    box-shadow: 0 -2px 10px var(--shadow-light);
}

/* Responsive Design */
.linux-mascot {
    position: fixed;
    bottom: 20px;
    right: 20px;
    width: 100px; /* Adjust size as needed */
    height: 100px;
    z-index: 999;
    pointer-events: none; /* Allow clicks to pass through */
}

.linux-mascot .eye-pupil {
    transform-origin: center center;
    transition: transform 0.1s linear; /* Smooth eye movement */
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        padding: 1rem;
    }

    .linux-mascot {
        width: 70px;
        height: 70px;
        bottom: 10px;
        right: 10px;
    }

    .nav-list {
        margin-top: 1rem;
        flex-wrap: wrap;
        justify-content: center;
    }

    .nav-list li {
        margin: 0.5rem 1rem;
    }

    .intro-section h1 {
        font-size: 2.5rem;
    }

    .intro-section p {
        font-size: 1rem;
    }

    .skills-section h2,
    .projects-section h2,
    .github-repos-section h2,
    .contact-section h2 {
        font-size: 2rem;
    }

    .section {
        padding: 6rem 1rem;
    }

    .skills-grid,
    .certificates-grid,
    .projects-grid,
    .repos-grid {
        grid-template-columns: 1fr;
    }

    .contact-buttons {
        flex-direction: column;
        gap: 1rem;
    }

    .btn {
        width: 80%;
        max-width: 300px;
        margin: 0 auto;
    }
}

* {
    user-select: none;
}