/* Modern Reset & Base Styling */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Outfit', 'Noto Sans KR', sans-serif;
}

:root {
    --primary-gradient: linear-gradient(135deg, #ff7e5f 0%, #ff6b8b 50%, #feb47b 100%); /* Warm sunset peach/coral */
    --bg-light: #fafaf9; /* Warm off-white */
    --card-bg: rgba(255, 255, 255, 0.9); /* Bright white glass */
    --card-border: rgba(255, 255, 255, 0.8);
    --text-main: #292524; /* Warm charcoal */
    --text-muted: #78716c; /* Warm stone gray */
    --glass-blur: blur(20px);
}

body {
    background-color: var(--bg-light);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* Background Glowing Blurs (Ultra Bright Warm Pastel Colors) */
.bg-blur {
    position: absolute;
    border-radius: 50%;
    filter: blur(100px);
    z-index: 1;
    opacity: 0.7;
    pointer-events: none;
}

.bg-blur-1 {
    width: 350px;
    height: 350px;
    background: #ffd6e8; /* Soft warm rose */
    top: -50px;
    left: -50px;
}

.bg-blur-2 {
    width: 400px;
    height: 400px;
    background: #ffedd5; /* Soft apricot/orange */
    bottom: -50px;
    right: -50px;
}

/* Main Container */
.main-container {
    width: 100%;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    z-index: 10;
}

/* Card Widget Container */
.card-container {
    position: relative;
    width: 100%;
    max-width: 420px;
    height: 640px;
    perspective: 1500px; /* Essential for 3D flip */
}

/* Toggle Button (Fixed Position - Warm Coral Theme) */
.toggle-btn {
    position: absolute;
    bottom: 25px;
    right: 25px;
    z-index: 50;
    padding: 12px 20px;
    border: none;
    border-radius: 50px;
    background: var(--primary-gradient);
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    box-shadow: 0 10px 20px rgba(255, 126, 95, 0.35);
    display: flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.toggle-btn:hover {
    transform: translateY(-3px) scale(1.05);
    box-shadow: 0 15px 25px rgba(255, 126, 95, 0.5);
}

.toggle-btn:active {
    transform: translateY(-1px) scale(0.98);
}

.toggle-btn i {
    font-size: 0.9rem;
    transition: transform 0.5s ease;
}

.card-container.flipped .toggle-btn i {
    transform: rotate(180deg);
}

/* Flipping Wrapper */
.card-wrapper {
    width: 100%;
    height: 100%;
    position: relative;
    transform-style: preserve-3d;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

/* Flip Action Triggered by class */
.card-container.flipped .card-wrapper {
    transform: rotateY(180deg);
}

/* Card Faces (Front & Back) */
.card-face {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 28px;
    border: 1px solid var(--card-border);
    background: var(--card-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    box-shadow: 0 20px 40px rgba(255, 126, 95, 0.08), 0 5px 15px rgba(120, 113, 108, 0.05);
    padding: 35px;
    display: flex;
    flex-direction: column;
}

.card-front {
    justify-content: space-between;
}

.card-back {
    transform: rotateY(180deg);
    justify-content: flex-start;
}

/* FRONT FACE (명함) STYLING */
.card-header {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    margin-top: 20px;
}

.avatar-container {
    width: 100px;
    height: 100px;
    border-radius: 50%;
    padding: 3px;
    background: var(--primary-gradient);
    margin-bottom: 20px;
    box-shadow: 0 8px 16px rgba(255, 126, 95, 0.2);
}

.profile-img {
    width: 100%;
    height: 100%;
    border-radius: 50%;
    object-fit: cover;
    background: #ffffff;
    display: block;
}

.name-kr {
    font-size: 1.8rem;
    font-weight: 700;
    letter-spacing: -0.5px;
    margin-bottom: 4px;
    color: #1c1917;
}

.name-en {
    font-size: 1rem;
    color: var(--text-muted);
    font-weight: 400;
    margin-bottom: 12px;
}

.job-title {
    font-size: 0.95rem;
    padding: 6px 14px;
    background: rgba(255, 126, 95, 0.08);
    border-radius: 50px;
    color: #ff6b8b;
    font-weight: 600;
    border: 1px solid rgba(255, 126, 95, 0.15);
}

.card-body {
    display: flex;
    flex-direction: column;
    gap: 16px;
    margin: 40px 0;
}

.contact-item {
    display: flex;
    align-items: center;
    gap: 14px;
    font-size: 0.95rem;
    color: #44403c;
}

.contact-item i {
    width: 32px;
    height: 32px;
    border-radius: 8px;
    background: rgba(255, 126, 95, 0.06);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #ff6b8b;
    font-size: 0.95rem;
    border: 1px solid rgba(255, 126, 95, 0.1);
}

.card-footer {
    display: flex;
    justify-content: center;
    padding-bottom: 20px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.02);
    display: flex;
    justify-content: center;
    align-items: center;
    color: #57534e;
    text-decoration: none;
    font-size: 1.2rem;
    border: 1px solid rgba(0, 0, 0, 0.04);
    transition: all 0.3s ease;
}

.social-links a:hover {
    background: var(--primary-gradient);
    color: white;
    transform: translateY(-3px);
    box-shadow: 0 8px 15px rgba(255, 126, 95, 0.25);
    border-color: transparent;
}

/* BACK FACE (이력서) STYLING */
.resume-header {
    margin-bottom: 20px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.06);
    padding-bottom: 15px;
}

.resume-title {
    font-size: 1.6rem;
    font-weight: 800;
    letter-spacing: 1px;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.resume-subtitle {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 4px;
}

/* Scrollable Container for Resume content */
.resume-scroll-container {
    flex-grow: 1;
    overflow-y: auto;
    padding-right: 8px;
    margin-bottom: 60px; /* Space for the floating button */
}

/* Custom Scrollbar for Resume */
.resume-scroll-container::-webkit-scrollbar {
    width: 4px;
}

.resume-scroll-container::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.01);
}

.resume-scroll-container::-webkit-scrollbar-thumb {
    background: rgba(0, 0, 0, 0.1);
    border-radius: 10px;
}

.resume-scroll-container::-webkit-scrollbar-thumb:hover {
    background: rgba(0, 0, 0, 0.2);
}

.resume-section {
    margin-bottom: 25px;
}

.section-title {
    font-size: 1.05rem;
    font-weight: 700;
    color: #44403c;
    margin-bottom: 12px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.section-title i {
    color: #ff6b8b;
    font-size: 0.95rem;
}

.section-text {
    font-size: 0.88rem;
    line-height: 1.6;
    color: var(--text-muted);
}

/* Timeline Items */
.timeline-item {
    position: relative;
    padding-left: 20px;
    border-left: 2px solid rgba(255, 107, 139, 0.2);
    margin-bottom: 20px;
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -6px;
    top: 4px;
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background: #ff6b8b;
    border: 2px solid #ffffff;
}

.timeline-meta {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 4px;
}

.timeline-org {
    font-weight: 600;
    color: #ff6b8b;
}

.timeline-title {
    font-size: 0.9rem;
    font-weight: 700;
    margin-bottom: 6px;
    color: #2b2b2b;
}

.timeline-desc {
    font-size: 0.8rem;
    line-height: 1.5;
    color: var(--text-muted);
}

/* Skill Tags */
.skills-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    font-size: 0.75rem;
    padding: 6px 12px;
    background: rgba(0, 0, 0, 0.03);
    border: 1px solid rgba(0, 0, 0, 0.05);
    border-radius: 50px;
    color: #57534e;
    font-weight: 500;
    transition: all 0.3s ease;
}

.skill-tag:hover {
    background: rgba(255, 107, 139, 0.08);
    border-color: rgba(255, 107, 139, 0.2);
    color: #ff6b8b;
    transform: translateY(-2px);
}

/* MOBILE RESPONSIVE STYLES */
@media (max-width: 480px) {
    body {
        padding: 0;
    }

    .main-container {
        padding: 15px;
    }

    .card-container {
        height: 85vh;
        max-height: 600px;
    }

    .card-face {
        padding: 24px;
        border-radius: 24px;
    }

    .card-header {
        margin-top: 10px;
    }

    .avatar-container {
        width: 80px;
        height: 80px;
        margin-bottom: 12px;
    }

    .avatar-gradient span {
        font-size: 1.5rem;
    }

    .name-kr {
        font-size: 1.5rem;
    }

    .name-en {
        font-size: 0.9rem;
        margin-bottom: 8px;
    }

    .job-title {
        font-size: 0.85rem;
        padding: 4px 12px;
    }

    .card-body {
        margin: 25px 0;
        gap: 12px;
    }

    .contact-item {
        font-size: 0.85rem;
    }

    .contact-item i {
        width: 28px;
        height: 28px;
        font-size: 0.85rem;
    }

    .social-links a {
        width: 38px;
        height: 38px;
        font-size: 1.1rem;
    }

    .toggle-btn {
        bottom: 20px;
        right: 20px;
        padding: 10px 16px;
        font-size: 0.8rem;
    }

    .resume-scroll-container {
        margin-bottom: 50px;
    }
}