/* Button Components */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: none;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: background-color var(--transition-fast), 
                transform var(--transition-fast),
                box-shadow var(--transition-fast);
}

.btn:focus-visible {
    outline: 2px solid var(--primary-500);
    outline-offset: 2px;
}

/* Button Variants */
.btn--primary {
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    box-shadow: var(--shadow-md);
}

.btn--primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn--secondary {
    background: var(--neutral-100);
    color: var(--neutral-800);
    border: 1px solid var(--neutral-200);
}

.btn--secondary:hover {
    background: var(--neutral-50);
    transform: translateY(-1px);
}

/* Button Sizes */
.btn--sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

.btn--md {
    padding: var(--space-3) var(--space-6);
    font-size: var(--text-base);
}

.btn--lg {
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-lg);
}

/* Legacy button class (for compatibility) */
.primary-button {
    @extend .btn, .btn--primary, .btn--md;
    background: linear-gradient(135deg, var(--primary-500), var(--primary-600));
    color: white;
    padding: var(--space-3) var(--space-8);
    border-radius: var(--radius-lg);
    font-weight: 500;
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.primary-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

/* Navigation Component */
.nav-container {
    padding: var(--space-6) var(--space-20);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 800;
    background: rgba(239, 239, 239, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.nav-content {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: var(--text-2xl);
    font-weight: 600;
    text-decoration: none;
    color: var(--neutral-800);
    letter-spacing: -0.5px;
}

.nav-links {
    display: flex;
    gap: var(--space-8);
    list-style: none;
}

.nav-links a {
    color: var(--neutral-800);
    font-weight: 500;
    text-decoration: none;
    transition: color var(--transition-fast);
}

.nav-links a:hover {
    color: var(--primary-500);
}

/* Project Card Component */
.project-card {
    background: white;
    border-radius: var(--radius-xl);
    overflow: hidden;
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    box-shadow: var(--shadow-sm);
}

.project-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}

.project-image img {
    width: 100%;
    height: 240px;
    object-fit: cover;
    transition: transform var(--transition-slow);
}

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

.project-info {
    padding: var(--space-8);
}

.project-category {
    font-size: var(--text-sm);
    color: var(--primary-500);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 500;
    margin-bottom: var(--space-2);
}

.project-info h3 {
    margin: var(--space-2) 0;
    font-size: var(--text-xl);
}

.view-project {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    margin-top: var(--space-6);
    color: var(--neutral-800);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.view-project:hover {
    color: var(--primary-500);
}

.arrow {
    transition: transform var(--transition-fast);
}

.view-project:hover .arrow {
    transform: translateX(4px);
}

/* Tool/Skill Component */
.tool-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-4);
    padding: var(--space-3);
    background: var(--neutral-50);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast);
}

.tool-item:hover {
    background: white;
}

.tool-bar {
    height: 4px;
    background: var(--neutral-200);
    border-radius: var(--radius-sm);
    width: 100px;
    position: relative;
    overflow: hidden;
}

.tool-bar::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--primary-500), var(--secondary-500));
    border-radius: var(--radius-sm);
    width: var(--level, 0%);
    transition: width var(--transition-slow);
}

.tool-bar[data-level="95"]::after { width: 95%; }
.tool-bar[data-level="80"]::after { width: 80%; }
.tool-bar[data-level="75"]::after { width: 75%; }
.tool-bar[data-level="70"]::after { width: 70%; }

/* Email Copy Button */
.email-copy-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2) var(--space-4);
    margin: var(--space-4) 0;
    background: var(--neutral-100);
    border: 1px solid var(--neutral-200);
    border-radius: var(--radius-md);
    color: var(--neutral-800);
    font-family: inherit;
    font-size: var(--text-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
}

.email-copy-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.6), 
        transparent
    );
    transition: left 0.6s ease;
}

.email-copy-btn:hover::before {
    left: 100%;
}

.email-copy-btn:hover {
    background: var(--neutral-50);
    border-color: var(--primary-500);
    transform: translateY(-1px);
}

.email-copy-btn:active {
    transform: translateY(0);
}

.email-copy-btn.copied {
    background: var(--primary-100);
    color: var(--primary-700);
    border-color: var(--primary-300);
    animation: shimmerSuccess 0.8s ease;
}

@keyframes shimmerSuccess {
    0% {
        background: var(--primary-100);
        box-shadow: 0 0 5px rgba(255, 107, 107, 0.3);
    }
    50% {
        background: var(--primary-200);
        box-shadow: 0 0 15px rgba(255, 107, 107, 0.6);
    }
    100% {
        background: var(--primary-100);
        box-shadow: 0 0 5px rgba(255, 107, 107, 0.3);
    }
}

.email-copy-btn.copied::before {
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.8), 
        transparent
    );
    left: 100%;
}

/* Social Links Component */
.social-links {
    display: flex;
    gap: var(--space-4);
    margin-top: var(--space-4);
}

.social-link {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--neutral-800);
    font-weight: 500;
    text-decoration: none;
    padding: var(--space-2) var(--space-4);
    border-radius: var(--radius-md);
    transition: background-color var(--transition-fast), color var(--transition-fast);
}

.social-icon {
    width: 18px;
    height: 18px;
    flex-shrink: 0;
}

.social-link:hover {
    background: var(--neutral-100);
    color: var(--primary-500);
}

/* Brand-specific hover colors */
.social-link[href*="linkedin"]:hover {
    color: #0077b5;
}

.social-link[href*="github"]:hover {
    color: #333;
}

.social-link[href*="notion"]:hover {
    color: #000;
}

/* Contact Buttons */
.contact-buttons {
    display: flex;
    flex-direction: column;
    gap: var(--space-4);
    align-items: flex-start;
    margin-top: var(--space-8);
}

/* Back Link Component */
.back-link {
    color: var(--neutral-800);
    text-decoration: none;
    font-weight: 500;
    transition: color var(--transition-fast);
}

.back-link:hover {
    color: var(--primary-500);
}

/* Timeline Component */
.timeline {
    list-style: none;
    position: relative;
    padding-left: var(--space-8);
}

.timeline::before {
    content: '';
    position: absolute;
    left: var(--space-4);
    top: 0;
    bottom: 0;
    width: 2px;
    background: var(--neutral-200);
}

.timeline li {
    position: relative;
    margin-bottom: var(--space-8);
    display: flex;
    gap: var(--space-4);
}

.timeline li::before {
    content: '';
    position: absolute;
    left: calc(-1 * var(--space-8) + var(--space-3));
    top: var(--space-2);
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: var(--primary-500);
}

.date {
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--primary-500);
    min-width: 120px;
}

.timeline-content h4 {
    margin: 0 0 var(--space-1) 0;
    font-size: var(--text-base);
}

.timeline-content p {
    margin: 0;
    color: var(--neutral-800);
    font-size: var(--text-sm);
}

/* Theme Toggle Button */
.theme-toggle {
    position: relative;
    width: 50px;
    height: 26px;
    background: var(--neutral-100);
    border: 2px solid var(--neutral-200);
    border-radius: 50px;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 2px;
    overflow: hidden;
}

.theme-toggle:hover {
    border-color: var(--primary-500);
    box-shadow: 0 0 0 2px rgba(255, 107, 107, 0.1);
}

.theme-toggle:focus-visible {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.2);
}

.theme-toggle::before {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 18px;
    height: 18px;
    background: white;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    transition: transform var(--transition-base), background-color var(--transition-base);
    z-index: 1;
}

.sun-icon,
.moon-icon {
    font-size: 12px;
    transition: opacity var(--transition-fast);
    z-index: 0;
}

.sun-icon {
    opacity: 1;
}

.moon-icon {
    opacity: 0.3;
}

/* Dark mode styles for toggle */
body.dark-mode .theme-toggle {
    background: var(--dark-bg-elevated);
    border-color: var(--dark-border);
}

body.dark-mode .theme-toggle::before {
    transform: translateX(24px);
    background: var(--dark-text-primary);
}

body.dark-mode .sun-icon {
    opacity: 0.3;
}

body.dark-mode .moon-icon {
    opacity: 1;
}

body.dark-mode .theme-toggle:hover {
    border-color: var(--dark-accent-primary);
    box-shadow: 0 0 0 2px rgba(255, 138, 138, 0.1);
}

body.dark-mode .theme-toggle:focus-visible {
    border-color: var(--dark-accent-primary);
    box-shadow: 0 0 0 4px rgba(255, 138, 138, 0.2);
}

/* Project Status Badge */
.project-status {
    display: inline-block;
    padding: var(--space-1) var(--space-3);
    font-size: var(--text-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-left: var(--space-3);
    vertical-align: middle;
}

.project-status[data-status="완료"] {
    background-color: var(--primary-100);
    color: var(--primary-700);
}

.project-status[data-status="진행 중"] {
    background-color: var(--secondary-100, #fff5e6); /* Fallback color */
    color: var(--secondary-700, #996a13);      /* Fallback color */
    animation: pulse-light 2s infinite;
}

/* Dark mode for status badges */
body.dark-mode .project-status[data-status="완료"] {
    background-color: var(--dark-accent-primary-translucent, rgba(80, 255, 172, 0.1));
    color: var(--dark-accent-primary, #50ffac);
}

body.dark-mode .project-status[data-status="진행 중"] {
    background-color: var(--dark-accent-secondary-translucent, rgba(255, 215, 138, 0.1));
    color: var(--dark-accent-secondary, #ffd78a);
    animation: pulse-dark 2s infinite;
}


/* Animation Keyframes */
@keyframes pulse-light {
  0% {
    box-shadow: 0 0 0 0 rgba(153, 106, 19, 0.4);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(153, 106, 19, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(153, 106, 19, 0);
  }
}

@keyframes pulse-dark {
  0% {
    box-shadow: 0 0 0 0 rgba(255, 215, 138, 0.4);
  }
  70% {
    box-shadow: 0 0 0 7px rgba(255, 215, 138, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(255, 215, 138, 0);
  }
}