/* 메인 스타일시트 - 기본 스타일과 레이아웃 */

:root {
    --primary-black: #000000;
    --soft-black: #1a1a1a;
    --charcoal: #2d2d2d;
    --warm-beige: #f7f5f3;
    --soft-cream: #faf9f7;
    --light-sage: #f0f4f0;
    --dusty-blue: #f4f6f8;
    --light-gray: #e9ecef;
    --accent-red: #ff3333;
    --accent-blue: #0066ff;
    --accent-green: #00cc66;
    --white: #ffffff;
    --shadow-light: 0 2px 10px rgba(0,0,0,0.05);
    --shadow-medium: 0 8px 25px rgba(0,0,0,0.1);
    --shadow-strong: 0 15px 35px rgba(0,0,0,0.15);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', 'Noto Sans KR', sans-serif;
    line-height: 1.6;
    color: var(--soft-black);
    background: var(--white);
    overflow-x: hidden;
}

/* 헤더 스타일 */
.header {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    border-bottom: 1px solid var(--light-gray);
    transition: var(--transition);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: relative;
}

.logo {
    font-family: 'Inter', sans-serif;
    font-size: 2rem;
    font-weight: 900;
    color: var(--primary-black);
    text-decoration: none;
    letter-spacing: -0.02em;
    transition: var(--transition);
    z-index: 1001;
}

.logo:hover {
    transform: scale(1.02);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 3rem;
    z-index: 1001;
}

.nav-item a {
    text-decoration: none;
    color: var(--soft-black);
    font-weight: 500;
    font-size: 0.95rem;
    padding: 0.75rem 0;
    border-bottom: 2px solid transparent;
    transition: var(--transition);
    position: relative;
}

.nav-item a:hover {
    color: var(--primary-black);
    border-bottom-color: var(--primary-black);
}

/* 모바일 메뉴 토글 버튼 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
    z-index: 1001;
}

.mobile-menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--primary-black);
    margin: 3px 0;
    transition: var(--transition);
    border-radius: 2px;
}

.mobile-menu-toggle.active span:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
}

.mobile-menu-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-toggle.active span:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
}

/* 히어로 섹션 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 8rem 2rem 4rem;
    background: linear-gradient(135deg, 
        var(--warm-beige) 0%, 
        var(--soft-cream) 25%, 
        var(--light-sage) 50%, 
        var(--dusty-blue) 75%, 
        var(--warm-beige) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 80%, rgba(0,102,255,0.03) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,51,51,0.03) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(0,204,102,0.02) 0%, transparent 50%);
    animation: float 20s ease-in-out infinite;
}

.hero-content {
    max-width: 1400px;
    width: 100%;
    display: grid;
    grid-template-columns: 1.2fr 0.8fr;
    gap: 6rem;
    align-items: center;
    z-index: 1;
}

.hero-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.hero-text h1 {
    font-family: 'Inter', sans-serif;
    font-size: clamp(2.5rem, 6vw, 5.5rem);
    font-weight: 800;
    color: var(--primary-black);
    line-height: 1.1;
    margin-bottom: 2rem;
    letter-spacing: -0.03em;
}

.smaller-text {
    font-size: 0.95em;
}

.hero-text .subtitle {
    font-size: 1.25rem;
    color: var(--charcoal);
    margin-bottom: 3rem;
    font-weight: 400;
    line-height: 1.6;
    max-width: 520px;
}

.platform-buttons {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 3rem;
    width: 60%;
    justify-content: flex-start;
}

.platform-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    background: var(--primary-black);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--border-radius);
    font-weight: 600;
    font-size: 1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
    position: relative;
    overflow: hidden;
    flex: 1;
    justify-content: center;
    text-align: center;
    min-width: 220px;
}

.platform-btn.class {
    background: var(--accent-blue);
}

.platform-btn.cloud {
    background: var(--accent-green);
}

.platform-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s ease;
}

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

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

.platform-icon {
    font-size: 1.2rem;
}

/* 스토리보드 컨테이너 */
.hero-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    isolation: isolate;
}

.storyboard-container {
    width: 450px;
    height: 450px;
    background: var(--white);
    border-radius: 20px;
    box-shadow: var(--shadow-strong);
    border: 1px solid var(--light-gray);
    position: relative;
    overflow: hidden;
    transform: rotate(-1deg);
    z-index: 100;
    transition: var(--transition);
}

.storyboard-container:hover {
    transform: rotate(0deg) scale(1.02);
    box-shadow: var(--shadow-strong), 0 0 0 3px rgba(0,102,255,0.1);
}

.storyboard-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 40px;
    width: 3px;
    height: 100%;
    background: repeating-linear-gradient(
        to bottom,
        #ff6b9d 0px,
        #ff6b9d 3px,
        transparent 3px,
        transparent 35px
    );
    opacity: 0.2;
    z-index: 1;
}

.storyboard-canvas {
    padding: 30px;
    height: 100%;
    position: relative;
    background:
        repeating-linear-gradient(
            to bottom,
            transparent 0px,
            transparent 33px,
            rgba(0,0,0,0.03) 33px,
            rgba(0,0,0,0.03) 35px
        );
    z-index: 2;
}

.storyboard-drawing {
    width: 100%;
    height: 100%;
    position: relative;
    z-index: 3;
}

/* 섹션 공통 스타일 */
.section-title {
    font-family: 'Inter', sans-serif;
    font-size: 3rem;
    font-weight: 900;
    color: var(--primary-black);
    text-align: center;
    margin-bottom: 4rem;
    letter-spacing: -0.02em;
}

/* 플랫폼 섹션 */
.platforms-section {
    padding: 8rem 2rem;
    background: linear-gradient(135deg,
        var(--light-sage) 0%,
        var(--dusty-blue) 50%,
        var(--warm-beige) 100%);
    position: relative;
}

.platforms-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image:
        linear-gradient(45deg, transparent 25%, rgba(0,0,0,0.005) 25%, rgba(0,0,0,0.005) 50%, transparent 50%, transparent 75%, rgba(0,0,0,0.005) 75%);
    background-size: 40px 40px;
}

.platforms-container {
    max-width: 1400px;
    margin: 0 auto;
    position: relative;
    z-index: 1;
}

.platforms-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.platform-card {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 24px;
    box-shadow: var(--shadow-light);
    border: 1px solid rgba(255,255,255,0.3);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.platform-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
}

.platform-card.class::before {
    background: var(--accent-blue);
}

.platform-card.cloud::before {
    background: var(--accent-green);
}

.platform-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-strong);
    background: rgba(255, 255, 255, 0.95);
}

.platform-card h3 {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 1rem;
}

.platform-card p {
    color: var(--charcoal);
    line-height: 1.7;
    margin-bottom: 2rem;
    font-size: 1.05rem;
}

.platform-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--primary-black);
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    border-bottom: 1px solid transparent;
}

.platform-link:hover {
    border-bottom-color: var(--primary-black);
}

/* 특징 섹션 */
.features-section {
    padding: 8rem 2rem;
    background: var(--soft-cream);
    position: relative;
}

.features-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 10% 20%, rgba(0,102,255,0.02) 0%, transparent 70%),
        radial-gradient(circle at 90% 80%, rgba(0,204,102,0.02) 0%, transparent 70%);
}

.features-container {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 3rem;
    margin-top: 4rem;
}

.feature-item {
    background: rgba(255, 255, 255, 0.7);
    backdrop-filter: blur(15px);
    padding: 2.5rem;
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-light);
    transition: var(--transition);
    border: 1px solid rgba(255,255,255,0.2);
}

.feature-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-medium);
    background: rgba(255, 255, 255, 0.9);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.5rem;
    display: block;
}

.feature-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-black);
    margin-bottom: 1rem;
}

.feature-item p {
    color: var(--charcoal);
    line-height: 1.6;
}

/* 문의 섹션 */
.inquiry-section {
    padding: 6rem 2rem 4rem;
    background: linear-gradient(135deg,
        var(--charcoal) 0%,
        var(--soft-black) 50%,
        var(--primary-black) 100%);
    position: relative;
    overflow: hidden;
}

.inquiry-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(circle at 30% 20%, rgba(0,102,255,0.1) 0%, transparent 50%),
        radial-gradient(circle at 70% 80%, rgba(0,204,102,0.1) 0%, transparent 50%);
}

.inquiry-container {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
    position: relative;
    z-index: 1;
}

.inquiry-title {
    font-family: 'Inter', sans-serif;
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 3rem;
    letter-spacing: -0.02em;
}

.inquiry-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(20px);
    padding: 3rem;
    border-radius: 24px;
    border: 1px solid rgba(255,255,255,0.2);
    max-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-strong);
}

.professor-name {
    font-size: 2rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 0.5rem;
}

.professor-title {
    font-size: 1.1rem;
    color: rgba(255,255,255,0.8);
    margin-bottom: 2rem;
    line-height: 1.5;
}

.inquiry-email {
    display: inline-block;
    padding: 1rem 2rem;
    background: rgba(255,255,255,0.9);
    color: var(--primary-black);
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-medium);
}

.inquiry-email:hover {
    background: var(--white);
    transform: translateY(-2px);
    box-shadow: var(--shadow-strong);
}

/* 푸터 */
.footer {
    background: var(--primary-black);
    color: var(--white);
    padding: 3rem 2rem 2rem;
    text-align: center;
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
}

.footer-logo {
    font-family: 'Inter', sans-serif;
    font-size: 2rem;
    font-weight: 900;
    color: var(--white);
    margin-bottom: 1rem;
    letter-spacing: -0.02em;
}

.footer p {
    opacity: 0.8;
    margin-bottom: 0.5rem;
    color: var(--light-gray);
}

/* 인터랙티브 도구 스타일 */
.floating-tools {
    position: absolute;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 50;
}

.floating-tool {
    position: absolute;
    font-size: 1.8rem;
    opacity: 0.4;
    animation: floatTool 8s ease-in-out infinite;
    transition: var(--transition);
    filter: blur(0.5px);
}

.storyboard-container:hover + .floating-tools .floating-tool {
    opacity: 0.1;
    filter: blur(2px);
}

.floating-tool:nth-child(1) {
    top: 10%;
    left: 5%;
    animation-delay: 0s;
}

.floating-tool:nth-child(2) {
    top: 15%;
    right: 5%;
    animation-delay: 2s;
}

.floating-tool:nth-child(3) {
    bottom: 25%;
    left: 8%;
    animation-delay: 4s;
}

.floating-tool:nth-child(4) {
    bottom: 10%;
    right: 8%;
    animation-delay: 6s;
}

.tool-interaction-zone {
    position: absolute;
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background: transparent;
    cursor: pointer;
    transition: var(--transition);
    z-index: 75;
}

.tool-interaction-zone:hover {
    background: rgba(255,255,255,0.1);
    backdrop-filter: blur(10px);
}

.tool-interaction-zone:hover .floating-tool {
    opacity: 1 !important;
    filter: blur(0px) !important;
    transform: scale(1.2) rotate(15deg) !important;
    animation-play-state: paused;
}

.tool-tooltip {
    position: absolute;
    bottom: -40px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--primary-black);
    color: var(--white);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    white-space: nowrap;
    z-index: 200;
}

.tool-interaction-zone:hover .tool-tooltip {
    opacity: 1;
    transform: translateX(-50%) translateY(-5px);
}

/* 페이드 인 애니메이션 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}