/* CSS Variables */
:root {
    --success-color: #28a745;
    --danger-color: #dc3545;
    --primary-color: #4285f4;
    --text-color: #333;
    --bg-color: #f8f9fa;
    --card-bg: #fff;
    --progress-bg: #e9ecef;
    --progress-green: #28a745;
    --progress-yellow-green: #74cd1b;
    --progress-yellow: #ffe100;
    --progress-orange: #ff9900;
    --progress-red: #dc3545;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --border-hover: #dee2e6;
    --icon-color: #6c757d;
}

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

/* Base Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
    background-color: var(--bg-color);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 30px 1rem 100px;
    overflow-x: hidden;
}

/* Timer Card */
.timer-card {
    background: var(--card-bg);
    border-radius: 0.75rem;
    box-shadow: 0 0.25rem 0.5rem var(--shadow-color);
    padding: 1.5rem;
    width: 80%;
    max-width: 50rem;
    border: 1px solid transparent;
    transition: all 0.3s ease;
    position: relative;
}

.timer-card:hover {
    border-color: var(--border-hover);
}

/* About Section */
.about-title {
    text-align: left;
    margin: 0.5rem 0;
    font-size: 2.5rem;
    color: var(--text-color);
    padding: 0.2rem;
    border-radius: 0.25rem;
    transition: all 0.2s ease;
}

.about-subtitle {
    color: var(--icon-color);
    margin-bottom: 1rem;
}

.about-content {
    text-align: left;
    color: var(--text-color);
    margin: 1rem 0;
}

.about-content section {
    margin-bottom: 1.5rem;
}

.about-content h2 {
    border-bottom: 1px solid var(--border-hover);
    padding-bottom: 0.5rem;
    margin-bottom: 1rem;
}

.about-content h3, 
.about-content h4 {
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.about-content p, 
.about-content ul {
    margin-bottom: 1rem;
    line-height: 1.6;
}

.about-content ul {
    list-style-type: none;
    padding: 0;
    padding-left: 1.5rem;
}

/* About Links */
.about-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

.about-links .about-link {
    background-color: var(--primary-color);
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    border-radius: 0.25rem;
    transition: background-color 0.3s ease;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
}

.about-links .close-link {
    background-color: var(--danger-color);
}

.about-links .about-link:hover {
    background-color: #3367d6;
}

/* About Benefits */
.about-benefits li i {
    margin-right: 0.5rem;
}

/* About Steps */
.about-steps .step h3,
.about-grid .grid-item h3 {
    color: var(--text-color);
    margin-bottom: 0.5rem;
}

.about-steps .step p i {
    margin-right: 0.5rem;
}

/* Dots */
.dot {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

.dot.green { background-color: var(--progress-green); }
.dot.yellow { background-color: var(--progress-yellow); }
.dot.orange { background-color: var(--progress-orange); }
.dot.red { background-color: var(--progress-red); }

/* Bibliography */
.bibliography {
    margin-top: 2rem;
    text-align: left;
}

.bibliography hr {
    border: none;
    border-top: 1px solid var(--icon-color);
    margin: 1rem 0;
}

.bibliography h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: bold;
}

.bibliography .citation-list {
    font-size: 0.8rem;
    color: var(--icon-color);
    line-height: 1.5;
}

.bibliography .citation-list p {
    margin-bottom: 0.5rem;
    text-indent: -1.5rem;
    padding-left: 1.5rem;
}

.bibliography .citation-list em {
    font-style: italic;
}

/* Tech Stack */
.tech-stack {
    margin-top: 2rem;
    text-align: left;
}

.tech-stack hr {
    border: none;
    border-top: 1px solid var(--icon-color);
    margin: 1rem 0;
}

.tech-stack h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: bold;
}

.tech-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    font-size: 0.9rem;
}

.tech-section {
    background-color: rgba(0,0,0,0.02);
    border-radius: 0.5rem;
    padding: 1rem;
    border: 1px solid rgba(0,0,0,0.05);
}

.tech-section h5 {
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    padding-bottom: 0.5rem;
}

.tech-section ul {
    list-style-type: none;
    padding: 0;
}

.tech-section ul li {
    margin-bottom: 0.5rem;
    color: var(--icon-color);
}

.tech-section ul li strong {
    color: var(--text-color);
    margin-right: 0.5rem;
}

/* Development Process */
.development-process {
    margin-top: 2rem;
    text-align: left;
}

.development-process hr {
    border: none;
    border-top: 1px solid var(--icon-color);
    margin: 1rem 0;
}

.development-process h4 {
    color: var(--text-color);
    margin-bottom: 1rem;
    font-size: 1rem;
    font-weight: bold;
}

.process-details {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 1rem;
    font-size: 0.9rem;
}

.process-section {
    background-color: rgba(0,0,0,0.02);
    border-radius: 0.5rem;
    padding: 1rem;
    border: 1px solid rgba(0,0,0,0.05);
}

.process-section h5 {
    color: var(--text-color);
    margin-bottom: 0.75rem;
    font-size: 0.95rem;
    border-bottom: 1px solid rgba(0,0,0,0.1);
    padding-bottom: 0.5rem;
}

.process-section ul {
    list-style-type: none;
    padding: 0;
}

.process-section ul li {
    margin-bottom: 0.5rem;
    color: var(--icon-color);
}

.process-section ul li strong {
    color: var(--text-color);
    margin-right: 0.5rem;
}

/* Copyright Notice */
.copyright-notice {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.5rem;
    text-align: center;
    font-size: 0.7rem;
    color: var(--icon-color);
    border-top: 1px solid rgba(0,0,0,0.1);
    background-color: var(--bg-color);
}

.copyright-notice a {
    color: var(--icon-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

copyright-notice a:hover {
    color: var(--text-color);
    text-decoration: underline;
}

body.dark-mode .copyright-notice a {
    color: var(--icon-color);
    transition: color 0.3s ease;
}

body.dark-mode .copyright-notice a:hover {
    color: white;
}

/* Responsive Design */
@media screen and (max-width: 768px) {
    .timer-card {
        width: 95%;
        padding: 1rem;
    }

    .about-title {
        font-size: 2rem;
        text-align: center;
    }

    .about-subtitle {
        text-align: center;
    }

    .about-grid {
        display: flex;
        flex-direction: column;
        align-items: center;
    }

    .about-grid .grid-item {
        width: 100%;
        margin-bottom: 1rem;
        text-align: center;
    }

    .about-links {
        flex-direction: column;
        align-items: center;
    }

    .about-links .about-link {
        width: 80%;
        justify-content: center;
        margin-bottom: 0.5rem;
    }

    .about-content section {
        margin-bottom: 2rem;
    }

    .psychology-details {
        text-align: center;
    }

    .psychology-details h4 {
        margin-top: 1rem;
    }

    .bibliography .citation-list p {
        text-indent: 0;
        padding-left: 0;
    }
}