:root {
  --color-primary: #2557eb;
  --color-primary-dark: #1a3fc4;
  --color-primary-darker: #142f94;
  --color-primary-light: #eaf0ff;
  --color-primary-border: #c9d6f5;

  --color-text: #1a2233;
  --color-text-secondary: #52607a;
  --color-bg: #ffffff;
  --color-bg-alt: #f4f7fd;
  --color-border: #dbe3f5;

  --color-success: #1f9254;
  --color-success-bg: #e9f8ef;
  --color-danger: #d64545;
  --color-danger-bg: #fdecec;

  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-sm: 8px;

  --shadow-card: 0 2px 10px rgba(26, 41, 89, 0.08);
  --shadow-button: 0 4px 14px rgba(37, 87, 235, 0.28);

  --fs-base: 19px;

  --font-en: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  --font-ar: 'Cairo', 'Tahoma', sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-en);
  font-size: var(--fs-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.5;
  -webkit-tap-highlight-color: transparent;
}

html[dir='rtl'] body {
  font-family: var(--font-ar);
}

button,
input,
textarea,
select {
  font-family: inherit;
}

a {
  color: inherit;
}

img {
  max-width: 100%;
  display: block;
}

/* Focus visibility for keyboard and accessibility */
a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 3px solid var(--color-primary-dark);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

/* ---------- Layout shells ---------- */

.page {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background: var(--color-bg);
}

.app-header {
  background: var(--color-primary);
  color: #fff;
  padding: 18px 16px;
  display: flex;
  align-items: center;
  gap: 12px;
  position: sticky;
  top: 0;
  z-index: 10;
  box-shadow: 0 2px 10px rgba(20, 47, 148, 0.18);
}

.app-header h1 {
  flex: 1;
  text-align: center;
  font-size: 1.35rem;
  margin: 0;
  font-weight: 800;
  padding-inline-end: 40px; /* balance the back button width */
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: none;
  border: none;
  color: #fff;
  font-size: 1.05rem;
  font-weight: 700;
  padding: 10px 8px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  min-height: 44px;
  white-space: nowrap;
}

.back-link:hover,
.back-link:focus-visible {
  background: rgba(255, 255, 255, 0.15);
}

.back-link svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

html[dir='rtl'] .back-link svg {
  transform: scaleX(-1);
}

.content {
  flex: 1;
  width: 100%;
  max-width: 640px;
  margin: 0 auto;
  padding: 28px 20px 48px;
}

.subtitle {
  text-align: center;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
  margin: 0 0 26px;
}

/* ---------- Landing / language screen ---------- */

.landing {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 40px 24px;
  max-width: 520px;
  margin: 0 auto;
}

.landing-title {
  font-size: 2.3rem;
  font-weight: 800;
  color: var(--color-text);
  margin: 0 0 14px;
  line-height: 1.2;
}

.landing-subtitle {
  color: var(--color-text-secondary);
  font-size: 1.15rem;
  margin: 0 0 40px;
}

.lang-buttons {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.lang-button {
  width: 100%;
  min-height: 72px;
  font-size: 1.4rem;
  font-weight: 800;
  color: #fff;
  background: var(--color-primary);
  border: none;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-button);
  cursor: pointer;
  transition: transform 0.12s ease, background 0.12s ease;
}

.lang-button:hover,
.lang-button:focus-visible {
  background: var(--color-primary-dark);
  transform: translateY(-1px);
}

.lang-button:active {
  transform: translateY(0);
}

.landing-footer {
  margin-top: 56px;
  color: #9aa6bf;
  font-size: 0.95rem;
}

/* ---------- Condition list ---------- */

.condition-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.condition-button {
  width: 100%;
  min-height: 76px;
  display: flex;
  align-items: center;
  gap: 16px;
  background: #fff;
  border: 2px solid var(--color-primary-border);
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  cursor: pointer;
  text-align: start;
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text);
  transition: border-color 0.12s ease, background 0.12s ease, transform 0.08s ease;
}

.condition-button:hover,
.condition-button:focus-visible {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}

.condition-button:active {
  transform: scale(0.99);
}

.condition-icon {
  flex-shrink: 0;
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--color-primary-light);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
}

.condition-icon svg {
  width: 28px;
  height: 28px;
}

.condition-name {
  flex: 1;
}

.condition-arrow {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: var(--color-primary);
}

html[dir='rtl'] .condition-arrow {
  transform: scaleX(-1);
}

/* ---------- Video page ---------- */

.video-wrapper {
  background: #000;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  margin-bottom: 20px;
}

.video-wrapper video {
  width: 100%;
  display: block;
  max-height: 70vh;
}

.download-button {
  width: 100%;
  min-height: 68px;
  background: var(--color-primary);
  color: #fff;
  font-size: 1.2rem;
  font-weight: 800;
  border: none;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  cursor: pointer;
  box-shadow: var(--shadow-button);
  text-decoration: none;
  margin-bottom: 24px;
}

.download-button:hover,
.download-button:focus-visible {
  background: var(--color-primary-dark);
}

.download-button svg {
  width: 26px;
  height: 26px;
}

.note-box {
  background: var(--color-primary-light);
  border: 1px solid var(--color-primary-border);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  font-size: 1rem;
  color: var(--color-text);
  margin-bottom: 24px;
}

.note-box strong {
  display: block;
  margin-bottom: 6px;
  color: var(--color-primary-darker);
}

.secondary-button {
  width: 100%;
  min-height: 60px;
  background: var(--color-bg-alt);
  color: var(--color-text);
  font-size: 1.1rem;
  font-weight: 700;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  cursor: pointer;
}

.secondary-button:hover,
.secondary-button:focus-visible {
  background: #eceff7;
}

.coming-soon {
  text-align: center;
  padding: 48px 20px;
  background: var(--color-bg-alt);
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
}

.coming-soon svg {
  width: 56px;
  height: 56px;
  color: var(--color-primary);
  margin: 0 auto 16px;
}

.coming-soon h2 {
  margin: 0 0 8px;
  font-size: 1.3rem;
}

.coming-soon p {
  margin: 0;
  color: var(--color-text-secondary);
}

/* ---------- States: loading / error / empty ---------- */

.state-block {
  text-align: center;
  padding: 60px 20px;
  color: var(--color-text-secondary);
}

.spinner {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  border: 4px solid var(--color-primary-border);
  border-top-color: var(--color-primary);
  animation: spin 0.9s linear infinite;
  margin: 0 auto 18px;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.retry-button {
  margin-top: 18px;
  min-height: 56px;
  padding: 0 28px;
  background: var(--color-primary);
  color: #fff;
  border: none;
  border-radius: var(--radius-md);
  font-size: 1.05rem;
  font-weight: 700;
  cursor: pointer;
}

.retry-button:hover,
.retry-button:focus-visible {
  background: var(--color-primary-dark);
}