@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

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

:root {
  --blue: #2563eb;
  --blue-dark: #1d4ed8;
  --cyan: #0891b2;
  --cyan-dark: #0e7490;
  --gradient: linear-gradient(135deg, #2563eb, #0891b2);
  --bg: #f8fafc;
  --card: #ffffff;
  --text: #1e293b;
  --text-muted: #64748b;
  --border: #e2e8f0;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --radius: 12px;
}

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
}

/* Header */
.header {
  background: var(--gradient);
  color: white;
  padding: 2rem 1.5rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.header::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 60%);
  animation: pulse 4s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.1); opacity: 1; }
}
.header h1 { font-size: 2rem; font-weight: 800; position: relative; }
.header p { opacity: 0.9; margin-top: 0.5rem; font-size: 1rem; position: relative; }
.header .badge {
  display: inline-block;
  background: rgba(255,255,255,0.2);
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
  margin-top: 0.75rem;
  position: relative;
}

/* Nav */
.nav {
  display: flex;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  overflow-x: auto;
  position: sticky;
  top: 0;
  z-index: 100;
}
.nav button {
  padding: 0.5rem 1.25rem;
  border: 2px solid var(--border);
  border-radius: 999px;
  background: white;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-muted);
  transition: all 0.2s;
  white-space: nowrap;
}
.nav button:hover { border-color: var(--blue); color: var(--blue); }
.nav button.active { background: var(--gradient); color: white; border-color: transparent; }

/* Main */
.container { max-width: 1200px; margin: 0 auto; padding: 1.5rem; }

/* Panels */
.panel { display: none; }
.panel.active { display: block; }

/* Cards */
.card {
  background: var(--card);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  border: 1px solid var(--border);
}
.card h2 { font-size: 1.125rem; font-weight: 700; margin-bottom: 1rem; display: flex; align-items: center; gap: 0.5rem; }

/* Form */
.form-group { margin-bottom: 1.25rem; }
.form-group label { display: block; font-weight: 600; font-size: 0.875rem; margin-bottom: 0.5rem; color: var(--text); }
.form-group input, .form-group textarea, .form-group select {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--border);
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9375rem;
  transition: border-color 0.2s;
  background: white;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none;
  border-color: var(--blue);
  box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}
.form-group textarea { resize: vertical; min-height: 80px; }

/* Platform selector */
.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.75rem;
}
.platform-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem;
  border: 2px solid var(--border);
  border-radius: var(--radius);
  background: white;
  cursor: pointer;
  transition: all 0.2s;
  font-family: inherit;
}
.platform-btn:hover { border-color: var(--blue); transform: translateY(-2px); box-shadow: var(--shadow-lg); }
.platform-btn.active { border-color: var(--blue); background: linear-gradient(135deg, rgba(37,99,235,0.05), rgba(8,145,178,0.05)); }
.platform-btn .icon { font-size: 1.75rem; }
.platform-btn .name { font-weight: 600; font-size: 0.875rem; }
.platform-btn .limit { font-size: 0.75rem; color: var(--text-muted); }

/* Tone chips */
.tone-chips { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.tone-chip {
  padding: 0.5rem 1rem;
  border: 2px solid var(--border);
  border-radius: 999px;
  background: white;
  cursor: pointer;
  font-family: inherit;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: all 0.2s;
}
.tone-chip:hover { border-color: var(--cyan); }
.tone-chip.active { background: var(--cyan); color: white; border-color: var(--cyan); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  border: none;
  border-radius: 8px;
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s;
}
.btn-primary {
  background: var(--gradient);
  color: white;
  box-shadow: 0 4px 14px rgba(37,99,235,0.3);
}
.btn-primary:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(37,99,235,0.4); }
.btn-primary:disabled { opacity: 0.6; cursor: not-allowed; transform: none; }
.btn-secondary { background: var(--bg); color: var(--text); border: 2px solid var(--border); }
.btn-secondary:hover { border-color: var(--blue); }
.btn-sm { padding: 0.4rem 0.75rem; font-size: 0.8125rem; }
.btn-icon { padding: 0.5rem; border-radius: 8px; background: none; border: 1px solid var(--border); cursor: pointer; transition: all 0.2s; }
.btn-icon:hover { background: var(--bg); }

/* Char count */
.char-count {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 0.5rem;
  font-size: 0.8125rem;
  color: var(--text-muted);
}
.char-count.over { color: #dc2626; font-weight: 600; }
.char-bar {
  height: 4px;
  background: var(--border);
  border-radius: 2px;
  margin-top: 0.25rem;
  overflow: hidden;
}
.char-bar-fill { height: 100%; border-radius: 2px; transition: width 0.3s, background 0.3s; }

/* Hashtags */
.hashtag-list { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; }
.hashtag {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem 0.75rem;
  background: linear-gradient(135deg, rgba(37,99,235,0.08), rgba(8,145,178,0.08));
  border-radius: 999px;
  font-size: 0.8125rem;
  font-weight: 500;
  color: var(--blue);
  cursor: pointer;
  transition: all 0.2s;
}
.hashtag:hover { background: linear-gradient(135deg, rgba(37,99,235,0.15), rgba(8,145,178,0.15)); }

/* Emoji picker */
.emoji-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(36px, 1fr));
  gap: 0.25rem;
  max-height: 200px;
  overflow-y: auto;
  padding: 0.5rem;
  background: var(--bg);
  border-radius: 8px;
  margin-top: 0.5rem;
}
.emoji-btn {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: none;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1.25rem;
  transition: background 0.15s;
}
.emoji-btn:hover { background: rgba(37,99,235,0.1); }

/* Post cards */
.posts-grid { display: grid; gap: 1rem; }
.post-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s;
}
.post-card:hover { box-shadow: var(--shadow-lg); }
.post-card-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}
.post-card-header .platform-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.6rem;
  border-radius: 6px;
  font-size: 0.75rem;
  font-weight: 600;
}
.post-card-body { padding: 1rem; }
.post-card-body .post-text {
  font-size: 0.9375rem;
  line-height: 1.6;
  white-space: pre-wrap;
  word-break: break-word;
}
.post-card-footer {
  display: flex;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg);
}

/* Preview */
.preview-container {
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  max-width: 500px;
  background: white;
}
.preview-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem;
  border-bottom: 1px solid var(--border);
}
.preview-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--gradient);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: 700;
}
.preview-name { font-weight: 600; font-size: 0.9375rem; }
.preview-handle { font-size: 0.8125rem; color: var(--text-muted); }
.preview-body { padding: 1rem; font-size: 0.9375rem; line-height: 1.6; white-space: pre-wrap; }
.preview-image-placeholder {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, #e0e7ff, #cffafe);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  font-size: 0.875rem;
}

/* Calendar */
.calendar-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 1rem; }
.calendar-header h3 { font-size: 1.125rem; font-weight: 700; }
.calendar-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 2px;
}
.calendar-day-header {
  text-align: center;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  padding: 0.5rem;
}
.calendar-day {
  aspect-ratio: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.15s;
  position: relative;
}
.calendar-day:hover { background: var(--bg); }
.calendar-day.today { font-weight: 700; color: var(--blue); }
.calendar-day.has-post::after {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  position: absolute;
  bottom: 4px;
}
.calendar-day.empty { cursor: default; }
.calendar-day.empty:hover { background: none; }

/* Batch */
.batch-list { display: grid; gap: 0.75rem; }
.batch-item {
  display: flex;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  align-items: flex-start;
}
.batch-num {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--gradient);
  color: white;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: 0.875rem;
  flex-shrink: 0;
}
.batch-content { flex: 1; }
.batch-actions { display: flex; gap: 0.5rem; flex-shrink: 0; }

/* Loading */
.loading { text-align: center; padding: 3rem; }
.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid var(--border);
  border-top-color: var(--blue);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 1rem;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* Empty state */
.empty-state {
  text-align: center;
  padding: 3rem 1.5rem;
  color: var(--text-muted);
}
.empty-state .icon { font-size: 3rem; margin-bottom: 1rem; }
.empty-state h3 { font-size: 1.125rem; color: var(--text); margin-bottom: 0.5rem; }

/* Toast */
.toast {
  position: fixed;
  bottom: 2rem;
  right: 2rem;
  padding: 0.75rem 1.25rem;
  background: #1e293b;
  color: white;
  border-radius: 8px;
  font-size: 0.875rem;
  font-weight: 500;
  box-shadow: var(--shadow-lg);
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s;
  z-index: 1000;
}
.toast.show { transform: translateY(0); opacity: 1; }

/* Ad placeholder */
.ad-banner {
  background: linear-gradient(135deg, #f1f5f9, #e2e8f0);
  border: 2px dashed var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8125rem;
  margin-bottom: 1.5rem;
}
.ad-banner strong { color: var(--text); }

/* Subscription */
.pricing-card {
  max-width: 400px;
  margin: 2rem auto;
  background: var(--card);
  border: 2px solid var(--blue);
  border-radius: var(--radius);
  padding: 2rem;
  text-align: center;
  box-shadow: var(--shadow-lg);
}
.pricing-card .price { font-size: 2.5rem; font-weight: 800; color: var(--blue); }
.pricing-card .period { color: var(--text-muted); }
.pricing-card .features { list-style: none; margin: 1.5rem 0; text-align: left; }
.pricing-card .features li { padding: 0.5rem 0; border-bottom: 1px solid var(--border); font-size: 0.9375rem; }
.pricing-card .features li::before { content: '✓ '; color: var(--cyan); font-weight: 700; }

/* Responsive */
@media (max-width: 768px) {
  .header h1 { font-size: 1.5rem; }
  .platform-grid { grid-template-columns: repeat(2, 1fr); }
  .nav { padding: 0.75rem; gap: 0.35rem; }
  .nav button { padding: 0.4rem 0.75rem; font-size: 0.8125rem; }
  .container { padding: 1rem; }
}