:root {
  --blue-900: #113a7f;
  --blue-700: #1f5fbe;
  --blue-500: #3b82f6;
  --blue-200: #cfe3ff;
  --white: #ffffff;
  --text-main: #10213d;
  --text-sub: #58719a;
  --border: #d7e6ff;
  --danger-bg: #ffe5e8;
  --danger-text: #8a0b20;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Noto Sans KR", sans-serif;
  color: var(--text-main);
  background: linear-gradient(160deg, #e8f2ff 0%, #f8fbff 45%, #dbeaff 100%);
  min-height: 100vh;
  position: relative;
  overflow-x: hidden;
}

.bg-shape {
  position: fixed;
  border-radius: 50%;
  filter: blur(10px);
  z-index: -1;
}

.bg-shape-1 {
  width: 360px;
  height: 360px;
  background: rgba(59, 130, 246, 0.2);
  top: -80px;
  right: -80px;
}

.bg-shape-2 {
  width: 280px;
  height: 280px;
  background: rgba(17, 58, 127, 0.15);
  bottom: -60px;
  left: -60px;
}

.site-header {
  text-align: center;
  padding: 42px 16px 24px;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.6rem, 3.8vw, 2.4rem);
  color: var(--blue-900);
  letter-spacing: -0.5px;
}

.site-header p {
  margin-top: 10px;
  color: var(--text-sub);
}

.container {
  width: min(980px, 94vw);
  margin: 0 auto 40px;
  display: grid;
  gap: 18px;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 14px 28px rgba(21, 76, 155, 0.08);
}

.composer {
  padding: 20px;
}

.composer h2,
.feed-wrap h2 {
  margin: 0 0 14px;
  font-size: 1.2rem;
  color: var(--blue-900);
}

#postForm {
  display: grid;
  gap: 10px;
}

label {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--blue-900);
}

input,
textarea {
  width: 100%;
  border: 1px solid #c1d9ff;
  border-radius: 10px;
  padding: 12px;
  font: inherit;
  background: #f8fbff;
}

input:focus,
textarea:focus {
  outline: 3px solid rgba(31, 95, 190, 0.2);
  border-color: var(--blue-700);
}

button {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  font: inherit;
  font-weight: 700;
  color: var(--white);
  background: linear-gradient(135deg, var(--blue-700), var(--blue-500));
  cursor: pointer;
}

button:hover {
  filter: brightness(1.02);
}

.feed-wrap {
  display: grid;
  gap: 12px;
}

.feed {
  display: grid;
  gap: 12px;
}

.post {
  padding: 16px;
  animation: rise 0.35s ease;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.post-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nickname {
  margin: 0;
  font-weight: 800;
  color: var(--blue-900);
}

.date {
  margin: 2px 0 0;
  color: var(--text-sub);
  font-size: 0.85rem;
}

.post-content {
  white-space: pre-wrap;
  line-height: 1.6;
  margin: 12px 0 16px;
}

.reactions {
  display: flex;
  gap: 10px;
  margin-bottom: 14px;
}

.reactions button {
  background: #edf4ff;
  color: var(--blue-900);
  border: 1px solid #c3dbff;
}

.comments {
  border-top: 1px solid #e3efff;
  padding-top: 12px;
}

.comments h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--blue-900);
}

.comment-list {
  display: grid;
  gap: 8px;
  margin-bottom: 10px;
}

.comment-item {
  background: #f5f9ff;
  border: 1px solid #d9e8ff;
  border-radius: 10px;
  padding: 8px 10px;
}

.comment-meta {
  margin: 0 0 4px;
  font-size: 0.85rem;
  color: var(--blue-900);
  font-weight: 700;
}

.comment-text {
  margin: 0;
  color: #18345d;
}

.comment-form {
  display: grid;
  grid-template-columns: 1fr 2fr auto;
  gap: 8px;
}

.global-error {
  background: var(--danger-bg);
  color: var(--danger-text);
  border: 1px solid #ffc5cc;
  border-radius: 12px;
  padding: 12px;
  font-weight: 700;
}

.hidden {
  display: none;
}

.empty {
  text-align: center;
  color: var(--text-sub);
  background: var(--white);
  border-radius: 12px;
  border: 1px dashed #b8d3ff;
  padding: 20px;
}

@media (max-width: 760px) {
  .comment-form {
    grid-template-columns: 1fr;
  }
}