/* ===================================
   プロジェクトページ専用スタイル
   css/projects.css
   
   @description 「創る楽しさ、伝える喜び」をテーマにした遊び心溢れるProjectsページ
   @author Research Portfolio Team
   @version 1.0.0
   =================================== */
:root {
    --projects-primary: var(--brand-primary);
}
/* ===================================
   Projects Page Style V2
   css/projects.css
   
   @description Simplified, interactive, and visually-driven project page.
   @author Gemini AI Engineer
   @version 2.0.0
   =================================== */

/* ===================================
   Hero Section
   =================================== */
.projects-hero {
    background: var(--gradient-hero);
    text-align: center;
}

.projects-hero-badge {
    display: inline-block;
    background: var(--bg-primary);
    color: var(--brand-primary);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--space-6);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-200);
}

.projects-hero-title {
    margin-bottom: var(--space-4);
}

.projects-hero-subtitle {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 650px;
    margin: 0 auto var(--space-8) auto;
}

.projects-hero-actions .btn__icon {
    transition: transform var(--duration-300) var(--ease-in-out);
}

.projects-hero-actions .btn:hover .btn__icon {
    transform: translateY(4px);
}

/* ===================================
   Featured Projects Grid
   =================================== */
.featured-projects {
    background-color: var(--bg-secondary);
}

.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--space-8);
}

/* ===================================
   New Project Card Design
   =================================== */
.project-card {
    background-color: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: transform var(--duration-300) var(--ease-out), box-shadow var(--duration-300) var(--ease-out);
    overflow: hidden;
    border: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl), 0 0 0 4px var(--brand-primary);
}

.project-card__visual {
    position: relative;
    overflow: hidden;
}

.project-card__visual img {
    width: 100%;
    height: 220px;
    object-fit: cover;
    transition: transform var(--duration-500) var(--ease-in-out);
}

.project-card:hover .project-card__visual img {
    transform: scale(1.05);
}

.project-card__category-badge {
    position: absolute;
    top: var(--space-4);
    right: var(--space-4);
    background-color: rgba(31, 61, 84, 0.78);
    backdrop-filter: blur(5px);
    color: var(--text-inverse);
    padding: var(--space-1) var(--space-3);
    border-radius: var(--radius-full);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    text-transform: uppercase;
    letter-spacing: var(--tracking-wider);
}

.project-card__category-badge--future {
    background-color: rgba(176, 140, 103, 0.85);
}

.project-card__content {
    padding: var(--space-6);
    display: flex;
    flex-direction: column;
    flex-grow: 1; /* Allows footer to stick to bottom */
}

.project-card__title {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--space-3);
    color: var(--text-primary);
}

.project-card__tech-stack {
    display: flex;
    gap: var(--space-3);
    margin-bottom: var(--space-4);
    align-items: center;
}

.project-card__tech-stack img,
.project-card__tech-stack .tech-icon {
    width: 24px;
    height: 24px;
    opacity: 0.7;
    transition: opacity var(--duration-200) ease;
}

.project-card__tech-stack img:hover,
.project-card__tech-stack .tech-icon:hover {
    opacity: 1;
}

.tech-icon {
    font-size: 24px;
    line-height: 1;
}

.project-card__description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    line-height: var(--leading-relaxed);
    margin-bottom: var(--space-6);
    flex-grow: 1;
}

.project-card__actions {
    display: flex;
    gap: var(--space-3);
    margin-top: auto; /* Pushes actions to the bottom */
    opacity: 0;
    transform: translateY(10px);
    transition: opacity var(--duration-300) var(--ease-out), transform var(--duration-300) var(--ease-out);
}

.project-card:hover .project-card__actions {
    opacity: 1;
    transform: translateY(0);
}

/* Hide description by default and show on hover */
.project-card__description {
    max-height: 0;
    opacity: 0;
    margin-bottom: 0;
    overflow: hidden;
    transition: max-height var(--duration-500) var(--ease-in-out), 
                opacity var(--duration-300) var(--ease-in-out) 0.1s,
                margin-bottom var(--duration-500) var(--ease-in-out);
}

.project-card:hover .project-card__description {
    max-height: 100px; /* Adjust as needed */
    opacity: 1;
    margin-bottom: var(--space-6);
}


/* Hide buttons without href */
.btn[href=""], .btn[href="#"] {
    display: none !important;
}


/* ===================================
   Call to Action Section
   =================================== */
.projects-cta {
    background: var(--primary-blue);
    color: var(--text-inverse);
    text-align: center;
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-lg);
}

.projects-cta-content {
    max-width: 700px;
    margin: 0 auto;
}

.cta-title {
    color: var(--text-inverse);
    margin-bottom: var(--space-4);
}

.cta-description {
    color: rgba(255, 255, 255, 0.78);
    font-size: var(--font-size-lg);
    margin-bottom: var(--space-8);
}


/* ===================================
   Responsive Adjustments
   =================================== */
@media (max-width: 768px) {
    .projects-grid {
        grid-template-columns: 1fr;
        gap: var(--space-6);
    }

    .projects-hero-subtitle {
        font-size: var(--font-size-base);
    }
}