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

:root {
  --bg: #0d0d0f;
  --surface: #18181c;
  --surface2: #222228;
  --border: #2e2e38;
  --accent: #b347ff;
  --accent2: #ff47b3;
  --text: #f0f0f5;
  --muted: #888899;
  --danger: #ff4466;
  --radius: 14px;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'Segoe UI', system-ui, sans-serif;
  min-height: 100vh;
}

/* Header */
header {
  text-align: center;
  padding: 40px 20px 20px;
}

.logo {
  font-size: 2.8rem;
  font-weight: 900;
  letter-spacing: -1px;
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.tagline {
  color: var(--muted);
  font-size: 0.85rem;
  margin-top: 4px;
  letter-spacing: 1px;
  text-transform: uppercase;
}

/* Upload section */
.upload-section {
  max-width: 520px;
  margin: 24px auto;
  padding: 0 16px;
}

.upload-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.drop-zone {
  border: 2px dashed var(--border);
  border-radius: 10px;
  min-height: 160px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.2s, background 0.2s;
  overflow: hidden;
  position: relative;
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: rgba(179, 71, 255, 0.05);
}

.drop-content {
  text-align: center;
  color: var(--muted);
  pointer-events: none;
  padding: 20px;
}

.drop-icon {
  font-size: 2.5rem;
  line-height: 1;
  margin-bottom: 8px;
  color: var(--accent);
  font-weight: 300;
}

.browse-link {
  color: var(--accent);
  text-decoration: underline;
  cursor: pointer;
  pointer-events: all;
}

.preview-img {
  width: 100%;
  max-height: 340px;
  object-fit: contain;
  border-radius: 8px;
}

.hidden { display: none !important; }

/* Form fields */
.form-fields {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

input[type="text"] {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  padding: 10px 14px;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

input[type="text"]:focus {
  border-color: var(--accent);
}

input[type="text"]::placeholder {
  color: var(--muted);
}

button#postBtn {
  background: linear-gradient(135deg, var(--accent), var(--accent2));
  border: none;
  border-radius: 8px;
  color: #fff;
  font-size: 1rem;
  font-weight: 700;
  padding: 12px;
  cursor: pointer;
  transition: opacity 0.2s, transform 0.1s;
  letter-spacing: 0.5px;
}

button#postBtn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

button#postBtn:not(:disabled):hover {
  opacity: 0.9;
}

button#postBtn:not(:disabled):active {
  transform: scale(0.98);
}

.error-msg {
  color: var(--danger);
  font-size: 0.85rem;
  text-align: center;
}

/* Feed */
.feed-section {
  max-width: 520px;
  margin: 0 auto 60px;
  padding: 0 16px;
}

.feed {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.loading {
  text-align: center;
  color: var(--muted);
  padding: 40px;
}

/* Post card */
.post-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  animation: fadeIn 0.3s ease;
}

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

.post-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
}

.post-username {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--accent);
}

.post-timer {
  font-size: 0.78rem;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 5px;
}

.timer-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent2);
  animation: pulse 2s infinite;
}

.timer-dot.soon {
  background: var(--danger);
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.post-image {
  width: 100%;
  max-height: 520px;
  object-fit: contain;
  background: #000;
  display: block;
}

.post-footer {
  padding: 10px 16px 14px;
}

.post-caption {
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text);
}

.post-caption .username-mention {
  color: var(--accent);
  font-weight: 600;
}

/* Expiry bar */
.expiry-bar-wrap {
  height: 2px;
  background: var(--border);
}

.expiry-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width 1s linear;
}

.expiry-bar.soon {
  background: var(--danger);
}

/* Empty state */
.empty-state {
  text-align: center;
  color: var(--muted);
  padding: 50px 20px;
}

.empty-state .big {
  font-size: 3rem;
  margin-bottom: 10px;
}