/* ============================================================
   CSS Custom Properties (Design Tokens)
   ============================================================ */
:root {
  --color-primary: #1B3A6B;
  --color-primary-dark: #122850;
  --color-accent: #E87722;
  --color-accent-dark: #cf6510;
  --color-text: #1a1a2e;
  --color-text-muted: #555e75;
  --color-bg: #ffffff;
  --color-bg-alt: #f7f9fc;
  --color-border: #dde3ed;
  --color-success: #1a7f4e;
  --color-error: #c0392b;

  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-base: 1rem;
  --font-size-sm: 0.875rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.375rem;
  --font-size-2xl: 1.75rem;
  --font-size-3xl: 2.25rem;

  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 8px 32px rgba(0,0,0,0.12);

  --max-width: 1100px;
  --section-padding: 4rem 1.25rem;
}

/* ============================================================
   Reset & Base
   ============================================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

ul {
  list-style: none;
}

/* ============================================================
   Layout Utilities
   ============================================================ */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

/* ============================================================
   Hero / Above-the-Fold Section
   ============================================================ */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #ffffff;
  padding: 3rem 1.25rem;
}

.hero__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}

/* Book cover */
.hero__book-cover {
  display: flex;
  justify-content: center;
}

.book-cover-img {
  width: 220px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.book-cover-placeholder {
  width: 220px;
  aspect-ratio: 2/3;
  background: rgba(255,255,255,0.15);
  border: 2px dashed rgba(255,255,255,0.4);
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(255,255,255,0.7);
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Copy */
.hero__copy {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.hero__eyebrow {
  display: inline-block;
  background: var(--color-accent);
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.3em 0.9em;
  border-radius: 20px;
  width: fit-content;
}

.hero__headline {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.hero__headline span {
  color: var(--color-accent);
}

.hero__benefits {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.hero__benefits li {
  display: flex;
  align-items: flex-start;
  gap: 0.6rem;
  font-size: var(--font-size-lg);
  line-height: 1.4;
}

.hero__benefits li::before {
  content: '✓';
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.4em;
  height: 1.4em;
  min-width: 1.4em;
  background: var(--color-accent);
  color: #fff;
  border-radius: 50%;
  font-size: 0.75em;
  font-weight: 700;
  margin-top: 0.1em;
}

/* ============================================================
   Email Capture Form
   ============================================================ */
.capture-form {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.form-row {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.form-row input[type="email"] {
  width: 100%;
  padding: 0.875rem 1rem;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.95);
  color: var(--color-text);
  transition: border-color 0.2s, box-shadow 0.2s;
  -webkit-appearance: none;
}

.form-row input[type="email"]:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(232,119,34,0.25);
}

.form-row input[type="email"].input-error {
  border-color: #ff6b6b;
}

.btn-submit {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  width: 100%;
  padding: 1rem 1.5rem;
  font-size: var(--font-size-lg);
  font-family: var(--font-family);
  font-weight: 700;
  color: #ffffff;
  background: var(--color-accent);
  border: none;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
  min-height: 54px;
  letter-spacing: 0.01em;
}

.btn-submit:hover:not(:disabled) {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(232,119,34,0.4);
}

.btn-submit:active:not(:disabled) {
  transform: translateY(0);
}

.btn-submit:disabled {
  opacity: 0.75;
  cursor: not-allowed;
}

.btn-submit .spinner {
  display: none;
  width: 18px;
  height: 18px;
  border: 2px solid rgba(255,255,255,0.4);
  border-top-color: #ffffff;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
}

.btn-submit.loading .spinner {
  display: block;
}

.btn-submit.loading .btn-text {
  opacity: 0.8;
}

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

.trust-line {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.75);
  text-align: center;
}

.trust-line svg {
  vertical-align: middle;
  margin-right: 0.25em;
}

/* Form messages */
.form-message {
  display: none;
  padding: 0.75rem 1rem;
  border-radius: var(--radius);
  font-size: var(--font-size-sm);
  font-weight: 600;
}

.form-message.error {
  display: block;
  background: rgba(192,57,43,0.15);
  border: 1px solid rgba(192,57,43,0.4);
  color: #ffcdd2;
}

.form-message.success {
  display: block;
  background: rgba(26,127,78,0.15);
  border: 1px solid rgba(26,127,78,0.4);
  color: #c8e6c9;
}

/* ============================================================
   About the Author
   ============================================================ */
.about {
  padding: var(--section-padding);
  background: var(--color-bg);
}

.about__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.author-photo-wrap {
  display: flex;
  justify-content: center;
}

.author-photo {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  object-fit: cover;
  border: 4px solid var(--color-primary);
  box-shadow: var(--shadow-md);
}

.author-photo-placeholder {
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: var(--color-bg-alt);
  border: 3px dashed var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: var(--font-size-sm);
  font-weight: 600;
  text-align: center;
  padding: 1rem;
}

.section-label {
  font-size: var(--font-size-sm);
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.5rem;
}

.about__copy h2 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: 1rem;
  line-height: 1.2;
}

.about__copy p {
  color: var(--color-text-muted);
  line-height: 1.8;
  margin-bottom: 0.75rem;
}

/* ============================================================
   Testimonials
   ============================================================ */
.testimonials {
  padding: var(--section-padding);
  background: var(--color-bg-alt);
}

.testimonials h2 {
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  text-align: center;
  margin-bottom: 2.5rem;
}

.testimonials__grid {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.testimonial-card {
  background: var(--color-bg);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
}

.testimonial-card__stars {
  color: var(--color-accent);
  font-size: 1.1rem;
  letter-spacing: 0.05em;
  margin-bottom: 0.75rem;
}

.testimonial-card__quote {
  font-size: var(--font-size-base);
  color: var(--color-text);
  line-height: 1.7;
  font-style: italic;
  margin-bottom: 1rem;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-card__avatar {
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.testimonial-card__name {
  font-weight: 700;
  font-size: var(--font-size-sm);
  color: var(--color-text);
}

.testimonial-card__meta {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255,255,255,0.7);
  padding: 2rem 1.25rem;
  text-align: center;
}

.site-footer__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}

.site-footer a {
  color: rgba(255,255,255,0.85);
  font-size: var(--font-size-sm);
}

.site-footer a:hover {
  color: #ffffff;
}

.site-footer__links {
  display: flex;
  gap: 1.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.site-footer__copy {
  font-size: var(--font-size-sm);
}

/* ============================================================
   Responsive — Tablet & Desktop (min-width: 768px)
   ============================================================ */
@media (min-width: 768px) {
  :root {
    --section-padding: 5rem 1.25rem;
  }

  .hero {
    padding: 4rem 1.25rem;
  }

  .hero__inner {
    grid-template-columns: auto 1fr;
    gap: 3rem;
  }

  .book-cover-img,
  .book-cover-placeholder {
    width: 280px;
  }

  .hero__headline {
    font-size: var(--font-size-3xl);
  }

  .form-row {
    flex-direction: row;
  }

  .form-row input[type="email"] {
    flex: 1;
    border-radius: var(--radius) 0 0 var(--radius);
    border-right: none;
  }

  .form-row input[type="email"]:focus {
    border-right: none;
    z-index: 1;
  }

  .form-row .btn-submit {
    width: auto;
    white-space: nowrap;
    border-radius: 0 var(--radius) var(--radius) 0;
    padding: 0.875rem 1.5rem;
    font-size: var(--font-size-base);
  }

  .about__inner {
    grid-template-columns: auto 1fr;
    gap: 3rem;
  }

  .testimonials__grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .site-footer__inner {
    flex-direction: row;
    justify-content: space-between;
  }
}