/* style.css */
:root {
    --primary-color: #4F46E5;
    --secondary-color: #9333EA;
    --bg-dark: #152141;
    --bg-card: rgba(255, 255, 255, 0.02);
    --text-light: #F8FAFC;
    --text-gray: #94A3B8;
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Pretendard', sans-serif; }
body { background-color: var(--bg-dark); color: var(--text-light); line-height: 1.6; }

/* Navigation */
header { position: fixed; top: 0; width: 100%; padding: 1.5rem 5%; background: rgba(15, 23, 42, 0.9); backdrop-filter: blur(10px); display: flex; justify-content: space-between; align-items: center; z-index: 1000; border-bottom: 1px solid rgba(255,255,255,0.05); }
header h1 a { font-size: 1.5rem; font-weight: 800; background: linear-gradient(to right, #4F46E5, #9333EA); -webkit-background-clip: text; color: transparent; text-decoration: none; }
nav { display: flex; gap: 1.5rem; }
nav a { color: var(--text-light); text-decoration: none; font-weight: 500; font-size: 0.95rem; transition: color 0.3s; }
nav a:hover, nav a.active { color: var(--primary-color); }

/* Common Section Layouts */
section { padding: 5rem 10%; }
.section-title { font-size: 2.2rem; margin-bottom: 3rem; text-align: center; font-weight: 700; }

/* Subpage Header (서브페이지 상단 배너) */
.subpage-header { padding: 10rem 10% 4rem; background: linear-gradient(to bottom, rgba(79, 70, 229, 0.1), var(--bg-dark)); text-align: center; }
.subpage-header h2 { font-size: 3rem; margin-bottom: 1rem; }
.subpage-header p { color: var(--text-gray); font-size: 1.1rem; }

/* Image Placeholder */
.img-placeholder { background-color: rgba(255, 255, 255, 0.03); border: 2px dashed rgba(255, 255, 255, 0.2); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: var(--text-gray); font-size: 0.9rem; text-align: center; padding: 1rem; width: 100%; }

/* Grid & Cards */
.grid-container { display: grid; gap: 2rem; }
.card { background: var(--bg-card); padding: 2rem; border-radius: 16px; border: 1px solid rgba(255, 255, 255, 0.05); }

/* Footer */
footer { text-align: center; padding: 3rem; color: var(--text-gray); font-size: 0.9rem; border-top: 1px solid rgba(255,255,255,0.05); margin-top: 4rem; }