/**
 * Motion — Web app styles
 * Brand: docs/BRAND.md
 */

/* Design tokens */
:root {
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-secondary: #ec4899;
  --color-secondary-hover: #db2777;
  --color-motion: #06b6d4;
  --color-motion-muted: #67e8f9;
  --color-bg: #0a0a0c;
  --color-surface: #141418;
  --color-border: #27272a;
  --color-text-heading: #fafafa;
  --color-text-body: #a1a1aa;
  --color-text-muted: #71717a;
  --color-success: #22c55e;
  --color-error: #ef4444;
  --gradient-primary: linear-gradient(135deg, #6366f1 0%, #ec4899 100%);
  --gradient-motion: linear-gradient(90deg, #06b6d4 0%, #6366f1 100%);
  --font-heading: "Plus Jakarta Sans", system-ui, sans-serif;
  --font-body: "Plus Jakarta Sans", system-ui, sans-serif;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --motion-duration-normal: 300ms;
  --motion-duration-medium: 500ms;
  --ease-out: cubic-bezier(0.33, 1, 0.68, 1);
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
}

/* Keyframes */
@keyframes motion-fade-in-up {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes motion-shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.motion-fade-in-up {
  animation: motion-fade-in-up var(--motion-duration-medium) var(--ease-out) forwards;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text-body);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.5;
  min-height: 100vh;
}

.app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header {
  padding: 1.5rem 2rem;
  border-bottom: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  gap: 1rem;
}
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-decoration: none;
}
.logo-icon {
  flex-shrink: 0;
  -webkit-text-fill-color: initial;
}
.tagline {
  color: var(--color-text-muted);
  font-size: 0.875rem;
}

.main {
  flex: 1;
  max-width: 42rem;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

.hero {
  text-align: center;
  margin-bottom: 2.5rem;
}
.hero-title {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 1.75rem;
  color: var(--color-text-heading);
  margin: 0 0 0.5rem;
}
.hero-sub {
  color: var(--color-text-muted);
  font-size: 1rem;
  margin: 0;
}

.generator {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
}
.generator-form {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.label {
  display: block;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-heading);
  margin-bottom: 0.25rem;
}
.textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-heading);
  font-family: inherit;
  font-size: 1rem;
  resize: vertical;
  min-height: 4.5rem;
}
.textarea::placeholder {
  color: var(--color-text-muted);
}
.textarea:focus {
  outline: none;
  border-color: var(--color-primary);
}
.row {
  display: flex;
  gap: 1rem;
  align-items: flex-end;
}
.field {
  flex: 0 0 auto;
}
.select {
  padding: 0.5rem 2rem 0.5rem 0.75rem;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-heading);
  font-family: inherit;
  font-size: 0.9375rem;
  min-width: 5rem;
}
.btn {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-md);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform var(--motion-duration-normal) var(--ease-out),
    background var(--motion-duration-normal), color var(--motion-duration-normal);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}
.btn-primary {
  background: var(--color-secondary);
  color: white;
}
.btn-primary:hover:not(:disabled) {
  background: var(--color-secondary-hover);
}
.btn-secondary {
  background: var(--color-surface);
  color: var(--color-motion);
  border: 1px solid var(--color-border);
  margin-top: 1rem;
}
.btn-secondary:hover {
  background: var(--color-border);
  color: var(--color-motion-muted);
}

.status {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}
.status-content {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.status-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}
.status-text {
  font-size: 0.9375rem;
  color: var(--color-motion);
}
.progress-bar {
  margin-top: 0.75rem;
  height: 4px;
  background: var(--color-border);
  border-radius: 2px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 100%;
  background: var(--gradient-motion);
  animation: motion-shimmer 1.5s linear infinite;
  background-size: 200% 100%;
}

.result {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
  animation: motion-fade-in-up var(--motion-duration-medium) var(--ease-out);
}
.result-label {
  font-size: 0.9375rem;
  color: var(--color-success);
  margin-bottom: 1rem;
}
.video-player {
  width: 100%;
  border-radius: var(--radius-md);
  background: var(--color-bg);
}
.result-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin-top: 1rem;
}
.feedback-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  margin-left: 0.5rem;
}
.btn-feedback {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.375rem 0.5rem;
  cursor: pointer;
  font-size: 1.125rem;
  transition: background var(--motion-duration-normal), border-color var(--motion-duration-normal);
}
.btn-feedback:hover {
  background: var(--color-border);
  border-color: var(--color-primary-muted);
}
.btn-feedback.feedback-given {
  opacity: 0.6;
  cursor: default;
}

.error {
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: rgba(239, 68, 68, 0.1);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-md);
  color: var(--color-error);
  font-size: 0.875rem;
}

.about {
  margin-top: 3rem;
  padding: 1.5rem;
  background: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}
.about-text {
  color: var(--color-text-muted);
  font-size: 0.9375rem;
  margin: 0;
}

.footer {
  padding: 1.5rem 2rem;
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
  font-size: 0.8125rem;
}