/* ========================================
   RED8 Corporate Website — Style
   ======================================== */

:root {
    --red: #DC2626;
    --red-dark: #B91C1C;
    --red-light: #FEE2E2;
    --dark: #0F172A;
    --dark-soft: #1E293B;
    --gray-900: #111827;
    --gray-700: #374151;
    --gray-500: #6B7280;
    --gray-400: #9CA3AF;
    --gray-300: #D1D5DB;
    --gray-100: #F3F4F6;
    --gray-50: #F9FAFB;
    --white: #FFFFFF;
    --font: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius: 16px;
    --radius-sm: 10px;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-lg: 0 10px 40px rgba(0,0,0,0.08);
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== RESET ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: var(--font);
    color: var(--gray-700);
    line-height: 1.7;
    background: var(--white);
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}
a { text-decoration: none; color: inherit; transition: color var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button, input, select, textarea {
    font-family: inherit;
    font-size: inherit;
    border: none;
    outline: none;
    background: none;
}

/* ===== UTILITIES ===== */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}
.text-gradient {
    background: linear-gradient(135deg, var(--red) 0%, #F97316 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-red { color: var(--red); }
.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    border-radius: 12px;
    font-weight: 600;
    font-size: 1rem;
    cursor: pointer;
    transition: all var(--transition);
    white-space: nowrap;
}
.btn-primary {
    background: var(--red);
    color: var(--white);
    box-shadow: 0 4px 14px rgba(220,38,38,0.3);
}
.btn-primary:hover {
    background: var(--red-dark);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(220,38,38,0.4);
}
.btn-outline {
    border: 2px solid rgba(255,255,255,0.3);
    color: var(--white);
    backdrop-filter: blur(4px);
}
.btn-outline:hover {
    border-color: var(--white);
    background: rgba(255,255,255,0.1);
}
.btn-full { width: 100%; justify-content: center; }

/* ===== ANIMATIONS ===== */
.fade-up {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-up.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ===== HEADER ===== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: 16px 0;
    transition: all var(--transition);
}
.header.scrolled {
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-100);
    padding: 10px 0;
    box-shadow: 0 1px 12px rgba(0,0,0,0.05);
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.25rem;
    font-weight: 300;
    color: var(--white);
    letter-spacing: 2px;
}
.logo strong { font-weight: 800; }
.logo-dark { display: none; }
.logo-white { display: block; }
.header.scrolled .logo { color: var(--dark); }
.header.scrolled .logo-dark { display: block; }
.header.scrolled .logo-white { display: none; }
.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}
.nav-link {
    font-size: 0.9rem;
    font-weight: 500;
    color: rgba(255,255,255,0.8);
    position: relative;
}
.nav-link::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--red);
    transition: width var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--white); }
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.header.scrolled .nav-link { color: var(--gray-500); }
.header.scrolled .nav-link:hover, .header.scrolled .nav-link.active { color: var(--dark); }
.nav-cta {
    background: var(--red);
    color: var(--white) !important;
    padding: 10px 22px;
    border-radius: 10px;
    font-weight: 600;
}
.nav-cta::after { display: none; }
.nav-cta:hover { background: var(--red-dark); }

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: 4px;
    z-index: 1001;
}
.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--white);
    border-radius: 2px;
    transition: all var(--transition);
}
.header.scrolled .mobile-toggle span { background: var(--dark); }
.mobile-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle.active span:nth-child(2) { opacity: 0; }
.mobile-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ===== HERO ===== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--dark);
    overflow: hidden;
    padding: 120px 24px 80px;
}
.hero-bg {
    position: absolute;
    inset: 0;
    overflow: hidden;
}
.hero-shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}
.hero-shape-1 {
    width: 600px;
    height: 600px;
    background: var(--red);
    top: -200px;
    right: -100px;
    animation: float1 8s ease-in-out infinite, pulse1 4s ease-in-out infinite;
}
.hero-shape-2 {
    width: 400px;
    height: 400px;
    background: #F97316;
    bottom: -100px;
    left: -100px;
    animation: float2 10s ease-in-out infinite, pulse2 5s ease-in-out infinite;
}
.hero-shape-3 {
    width: 300px;
    height: 300px;
    background: #7C3AED;
    top: 50%;
    left: 50%;
    animation: float3 12s ease-in-out infinite, pulse3 3.5s ease-in-out infinite;
}
@keyframes float1 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(-40px, 40px); } }
@keyframes float2 { 0%, 100% { transform: translate(0, 0); } 50% { transform: translate(40px, -30px); } }
@keyframes float3 { 0%, 100% { transform: translate(-50%, -50%); } 50% { transform: translate(-40%, -60%); } }
@keyframes pulse1 { 0%, 100% { opacity: 0.25; } 50% { opacity: 0.55; } }
@keyframes pulse2 { 0%, 100% { opacity: 0.2; } 50% { opacity: 0.5; } }
@keyframes pulse3 { 0%, 100% { opacity: 0.3; } 50% { opacity: 0.6; } }

.hero-content {
    position: relative;
    text-align: center;
    max-width: 720px;
}
.hero-tag {
    display: inline-block;
    padding: 8px 20px;
    border-radius: 50px;
    border: 1px solid rgba(255,255,255,0.15);
    color: rgba(255,255,255,0.7);
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 3px;
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
    background: rgba(255,255,255,0.05);
}
.hero-title {
    font-size: clamp(2.2rem, 5.5vw, 3.8rem);
    font-weight: 800;
    color: var(--white);
    line-height: 1.3;
    margin-bottom: 24px;
    letter-spacing: -1px;
}
.hero-desc {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.6);
    line-height: 1.8;
    margin-bottom: 40px;
}
.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
    margin-bottom: 60px;
}
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 48px;
    padding-top: 40px;
    border-top: 1px solid rgba(255,255,255,0.08);
}
.stat strong {
    display: block;
    font-size: 2rem;
    font-weight: 800;
    color: var(--white);
    line-height: 1.2;
}
.stat strong span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--red);
}
.stat > span {
    font-size: 0.85rem;
    color: rgba(255,255,255,0.4);
}

/* Scroll indicator */
.scroll-indicator {
    position: absolute;
    bottom: 32px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}
.scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid rgba(255,255,255,0.25);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}
.scroll-dot {
    width: 3px;
    height: 8px;
    background: rgba(255,255,255,0.5);
    border-radius: 2px;
    animation: scrollDot 2s infinite;
}
@keyframes bounce { 0%, 100% { transform: translateX(-50%) translateY(0); } 50% { transform: translateX(-50%) translateY(8px); } }
@keyframes scrollDot { 0% { opacity: 1; transform: translateY(0); } 100% { opacity: 0; transform: translateY(8px); } }

/* ===== SECTIONS COMMON ===== */
.section {
    padding: 120px 0;
}
.section-label {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--red);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: 16px;
}
.section-title {
    font-size: clamp(1.8rem, 3.5vw, 2.6rem);
    font-weight: 800;
    color: var(--dark);
    line-height: 1.35;
    margin-bottom: 16px;
    letter-spacing: -0.5px;
}
.section-desc {
    font-size: 1.05rem;
    color: var(--gray-500);
    max-width: 560px;
    margin-bottom: 56px;
}

/* ===== ABOUT ===== */
.about {
    background: var(--gray-50);
}
.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}
.about-card {
    background: var(--white);
    border-radius: var(--radius);
    padding: 32px 28px;
    box-shadow: var(--shadow);
    transition: all var(--transition);
}
.about-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.about-icon {
    width: 48px;
    height: 48px;
    margin-bottom: 20px;
    color: var(--red);
}
.about-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 10px;
}
.about-card p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.7;
}
/* Tech Stack Bar */
.tech-bar {
    margin-top: 28px;
    background: var(--dark);
    border-radius: var(--radius);
    padding: 32px 36px;
    box-shadow: var(--shadow);
    display: flex;
    align-items: center;
    gap: 36px;
}
.tech-bar-label {
    font-size: 0.78rem;
    font-weight: 700;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--gray-400);
    white-space: nowrap;
    writing-mode: vertical-lr;
    transform: rotate(180deg);
}
.tech-bar-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    flex: 1;
    justify-content: center;
}
.tech-chip {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px 8px 8px;
    background: rgba(255,255,255,0.04);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: 50px;
    transition: all var(--transition);
}
.tech-chip:hover {
    background: rgba(255,255,255,0.1);
    border-color: rgba(255,255,255,0.15);
    transform: translateY(-2px);
}
.tech-chip svg {
    flex-shrink: 0;
}
.tech-chip span {
    font-size: 0.82rem;
    font-weight: 600;
    color: rgba(255,255,255,0.8);
    white-space: nowrap;
}

/* ===== SERVICES ===== */
.services-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.service-card {
    position: relative;
    background: var(--white);
    border: 1px solid var(--gray-100);
    border-radius: var(--radius);
    padding: 40px 36px;
    transition: all var(--transition);
    overflow: hidden;
}
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--red), #F97316);
    opacity: 0;
    transition: opacity var(--transition);
}
.service-card:hover {
    border-color: transparent;
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}
.service-card:hover::before { opacity: 1; }
.service-num {
    font-size: 3rem;
    font-weight: 900;
    color: var(--gray-100);
    line-height: 1;
    margin-bottom: 20px;
}
.service-icon {
    width: 56px;
    height: 56px;
    color: var(--red);
    margin-bottom: 24px;
}
.service-card h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 12px;
}
.service-card p {
    font-size: 0.95rem;
    color: var(--gray-500);
    margin-bottom: 20px;
    line-height: 1.7;
}
.service-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.service-tags li {
    padding: 6px 14px;
    background: var(--gray-50);
    border-radius: 50px;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--gray-500);
}

/* ===== SOLUTIONS ===== */
.solutions {
    background: var(--dark);
}
.solutions .section-label { color: #F87171; }
.solutions .section-title { color: var(--white); }
.solutions .section-desc { color: var(--gray-400); }

.solutions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 24px;
}
.solution-card {
    background: var(--dark-soft);
    border: 1px solid rgba(255,255,255,0.06);
    border-radius: var(--radius);
    padding: 30px 15px;
    transition: all var(--transition);
}
.solution-card:hover {
    border-color: rgba(220,38,38,0.3);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.3);
}
.solution-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 50px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--red);
    background: rgba(220,38,38,0.1);
    margin-bottom: 24px;
}
.solution-visual {
    width: 100%;
    height: 160px;
    margin-bottom: 24px;
    border-radius: 10px;
    overflow: hidden;
    background: rgba(255,255,255,0.03);
}
.solution-visual img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: 10px;
    opacity: 0.85;
    transition: all 0.4s ease;
}
.solution-card:hover .solution-visual img {
    opacity: 1;
    transform: scale(1.03);
}
.solution-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 10px;
}
.solution-card p {
    font-size: 0.9rem;
    color: var(--gray-400);
    margin-bottom: 20px;
    line-height: 1.7;
}
.solution-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}
.solution-features li {
    padding: 5px 12px;
    border: 1px solid rgba(255,255,255,0.08);
    border-radius: 50px;
    font-size: 0.78rem;
    color: var(--gray-400);
}
.solution-link {
    display: block;
    color: inherit;
    text-decoration: none;
}
.solution-link:hover h3 {
    color: var(--red);
}

/* ===== PORTFOLIO ===== */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
}
.portfolio-card {
    border-radius: var(--radius);
    overflow: hidden;
    background: var(--white);
    border: 1px solid var(--gray-100);
    transition: all var(--transition);
}
.portfolio-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}
.portfolio-thumb {
    height: 240px;
    position: relative;
    overflow: hidden;
}
.portfolio-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}
.portfolio-card:hover .portfolio-thumb img {
    transform: scale(1.05);
}
.portfolio-info {
    padding: 28px;
}
.portfolio-tag {
    display: inline-block;
    padding: 4px 10px;
    background: var(--gray-50);
    border-radius: 6px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--gray-500);
    margin-bottom: 12px;
}
.portfolio-info h3 {
    font-size: 1.15rem;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 8px;
}
.portfolio-info p {
    font-size: 0.9rem;
    color: var(--gray-500);
    line-height: 1.6;
}
.portfolio-card-link {
    display: block;
    color: inherit;
    text-decoration: none;
}

/* ===== CERTIFICATIONS ===== */
.certs {
    background: var(--gray-50);
}
.certs-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 28px;
}
.cert-card {
    text-align: center;
}
.cert-frame {
    position: relative;
    background: #fff;
    border-radius: 4px;
    padding: 14px;
    box-shadow:
        0 2px 8px rgba(0,0,0,0.06),
        inset 0 0 0 1px rgba(0,0,0,0.04);
    /* 액자 바깥 테두리 */
    border: 8px solid #e8e0d4;
    outline: 2px solid #d4c9b8;
    transition: all var(--transition);
    overflow: hidden;
}
.cert-frame::before {
    content: '';
    position: absolute;
    inset: 0;
    border: 1px solid rgba(0,0,0,0.05);
    pointer-events: none;
    z-index: 1;
}
.cert-frame::after {
    content: '';
    position: absolute;
    inset: 4px;
    border: 1px solid rgba(180,160,130,0.3);
    pointer-events: none;
    z-index: 1;
}
.cert-card:hover .cert-frame {
    transform: translateY(-6px);
    box-shadow:
        0 12px 32px rgba(0,0,0,0.1),
        inset 0 0 0 1px rgba(0,0,0,0.04);
}
.cert-frame img {
    width: 100%;
    height: 260px;
    object-fit: contain;
    display: block;
    border-radius: 2px;
}
.cert-label {
    margin-top: 16px;
    font-size: 0.88rem;
    font-weight: 600;
    color: var(--gray-700);
    line-height: 1.4;
}

/* Cert lightbox */
.cert-lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 2000;
    background: rgba(0,0,0,0.85);
    backdrop-filter: blur(8px);
    align-items: center;
    justify-content: center;
    cursor: zoom-out;
}
.cert-lightbox.active {
    display: flex;
}
.cert-lightbox img {
    max-width: 90vw;
    max-height: 90vh;
    object-fit: contain;
    border-radius: 8px;
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.cert-lightbox-close {
    position: absolute;
    top: 20px;
    right: 24px;
    width: 44px;
    height: 44px;
    border: none;
    background: rgba(255,255,255,0.1);
    color: #fff;
    font-size: 1.5rem;
    border-radius: 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}
.cert-lightbox-close:hover {
    background: rgba(255,255,255,0.2);
}

@media (max-width: 1024px) {
    .certs-grid { grid-template-columns: repeat(3, 1fr); gap: 20px; }
}
@media (max-width: 768px) {
    .certs-grid { grid-template-columns: repeat(2, 1fr); gap: 16px; }
    .cert-frame { padding: 10px; border-width: 6px; }
    .cert-frame img { height: 200px; }
}
@media (max-width: 480px) {
    .certs-grid { grid-template-columns: 1fr; max-width: 300px; margin: 0 auto; }
}

/* Portfolio more button */
.portfolio-more {
    text-align: center;
    margin-top: 40px;
}
.btn-more {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 40px;
    border-radius: 12px;
    font-size: 0.95rem;
    font-weight: 600;
    color: var(--gray-700);
    background: var(--white);
    border: 1.5px solid var(--gray-300);
    cursor: pointer;
    transition: all var(--transition);
}
.btn-more:hover {
    border-color: var(--red);
    color: var(--red);
    transform: translateY(-2px);
    box-shadow: 0 4px 14px rgba(220,38,38,0.12);
}
.btn-more:disabled {
    opacity: 0.5;
    cursor: wait;
}
.portfolio-thumb-empty {
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-100);
    color: var(--gray-400);
    font-size: 0.9rem;
}

/* ===== CONTACT ===== */
.contact {
    background: var(--gray-50);
}
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 64px;
    align-items: start;
}
.contact-desc {
    font-size: 1rem;
    color: var(--gray-500);
    margin: 24px 0 40px;
    line-height: 1.7;
}
.contact-details {
    display: flex;
    flex-direction: column;
    gap: 20px;
}
.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
    color: var(--gray-500);
}
.contact-item svg { flex-shrink: 0; margin-top: 2px; }
.contact-item strong {
    display: block;
    font-size: 0.8rem;
    color: var(--gray-400);
    font-weight: 500;
    margin-bottom: 2px;
}
.contact-item span {
    font-size: 0.95rem;
    color: var(--dark);
    font-weight: 500;
}

/* Form */
.contact-form {
    background: var(--white);
    border-radius: var(--radius);
    padding: 40px;
    box-shadow: var(--shadow-lg);
}
.form-group {
    margin-bottom: 20px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 8px;
}
.required { color: var(--red); }
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 13px 16px;
    border: 1.5px solid var(--gray-300);
    border-radius: var(--radius-sm);
    font-size: 0.95rem;
    color: var(--dark);
    background: var(--white);
    transition: border-color var(--transition);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    border-color: var(--red);
    box-shadow: 0 0 0 3px rgba(220,38,38,0.08);
}
.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B7280' d='M6 8L1 3h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 14px center;
    padding-right: 36px;
    cursor: pointer;
}

.form-result {
    margin-top: 16px;
    padding: 14px 18px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    display: none;
}
.form-result.success {
    display: block;
    background: #ECFDF5;
    color: #065F46;
    border: 1px solid #A7F3D0;
}
.form-result.error {
    display: block;
    background: #FEF2F2;
    color: #991B1B;
    border: 1px solid #FECACA;
}

/* Submit button loading */
.btn-loading {
    pointer-events: none;
    opacity: 0.7;
}

/* ===== FOOTER ===== */
.footer {
    background: var(--dark);
    padding: 64px 0 0;
}
.footer-top {
    display: flex;
    justify-content: space-between;
    gap: 48px;
    padding-bottom: 48px;
    border-bottom: 1px solid rgba(255,255,255,0.06);
}
.footer-brand .logo {
    margin-bottom: 16px;
}
.footer-brand p {
    color: var(--gray-500);
    font-size: 0.9rem;
}
.footer-links {
    display: flex;
    gap: 64px;
}
.footer-col h4 {
    color: var(--white);
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 16px;
}
.footer-col a {
    display: block;
    color: var(--gray-500);
    font-size: 0.85rem;
    margin-bottom: 10px;
    transition: color var(--transition);
}
.footer-col a:hover { color: var(--white); }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 24px 0;
}
.footer-bottom p {
    color: var(--gray-500);
    font-size: 0.8rem;
}
.footer-social {
    display: flex;
    gap: 12px;
}
.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 10px;
    color: var(--gray-500);
    border: 1px solid rgba(255,255,255,0.08);
    transition: all var(--transition);
}
.footer-social a:hover {
    color: var(--white);
    border-color: var(--red);
    background: rgba(220,38,38,0.1);
}

/* ===== KAKAO FLOATING BUTTON ===== */
.kakao-btn {
    position: fixed;
    bottom: 28px;
    right: 28px;
    z-index: 999;
    width: 60px;
    height: 60px;
    background: #FEE500;
    border-radius: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 20px rgba(0,0,0,0.15);
    transition: all var(--transition);
    cursor: pointer;
}
.kakao-btn:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 30px rgba(0,0,0,0.2);
}
.kakao-btn:active {
    transform: translateY(-2px);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: repeat(3, 1fr);
    }
    .tech-bar {
        flex-direction: column;
        gap: 16px;
        padding: 24px;
    }
    .tech-bar-label {
        writing-mode: horizontal-tb;
        transform: none;
    }
    .contact-wrapper {
        grid-template-columns: 1fr;
        gap: 40px;
    }
    .footer-links { gap: 40px; }
}

@media (max-width: 768px) {
    .section { padding: 80px 0; }

    .mobile-toggle { display: flex; }

    .nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background: var(--white);
        flex-direction: column;
        align-items: flex-start;
        padding: 100px 32px 40px;
        gap: 0;
        box-shadow: -10px 0 40px rgba(0,0,0,0.1);
        transition: right var(--transition);
    }
    .nav.open { right: 0; }
    .nav-link {
        color: var(--gray-700) !important;
        font-size: 1.05rem;
        padding: 14px 0;
        width: 100%;
        border-bottom: 1px solid var(--gray-100);
    }
    .nav-link::after { display: none; }
    .nav-link.active { color: var(--red) !important; font-weight: 700; }
    .nav-cta {
        margin-top: 16px;
        text-align: center;
        width: 100%;
        justify-content: center;
    }

    .hero-stats { gap: 24px; }
    .stat strong { font-size: 1.5rem; }

    .about-grid { grid-template-columns: 1fr; }
    .tech-bar-grid { gap: 8px; }
    .tech-chip { padding: 6px 12px 6px 6px; }
    .tech-chip svg { width: 26px; height: 26px; }
    .services-grid { grid-template-columns: 1fr; }
    .portfolio-grid { grid-template-columns: 1fr; }

    .form-row { grid-template-columns: 1fr; }
    .contact-form { padding: 28px 20px; }

    .footer-top { flex-direction: column; gap: 32px; }
    .footer-links { gap: 32px; flex-wrap: wrap; }
    .footer-bottom { flex-direction: column; gap: 16px; text-align: center; }
}

@media (max-width: 480px) {
    .hero { padding: 100px 16px 60px; }
    .hero-title { font-size: 1.8rem; }
    .hero-desc { font-size: 0.95rem; }
    .hero-stats { flex-direction: column; gap: 16px; }
    .btn { padding: 12px 24px; font-size: 0.9rem; }
}