/* ===================================================================
   Rudi Mohamed — Executive Navy Design System
   =================================================================== */

:root {
  /* Type scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);
  --text-hero: clamp(2.75rem, 0.6rem + 6.5vw, 6.5rem);

  /* 4px spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1.25rem;
  --radius-full: 9999px;

  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);

  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;
  --content-full: 100%;

  /* Fonts */
  --font-display: 'Sora', 'Segoe UI', sans-serif;
  --font-body: 'Inter', 'Segoe UI', sans-serif;
}

/* ---------------- DARK MODE (Executive Navy — brand default) ---------------- */
:root,
[data-theme='dark'] {
  --color-bg: #0b1f3a;
  --color-bg-2: #13294b;
  --color-surface: #10254a;
  --color-surface-2: #152c54;
  --color-surface-offset: #1a3260;
  --color-border: oklch(0.55 0.06 240 / 0.18);
  --color-divider: oklch(0.55 0.06 240 / 0.14);

  --color-text: #f4f8ff;
  --color-text-muted: #9db2ce;
  --color-text-faint: #6c84a8;
  --color-text-inverse: #0b1f3a;

  --color-primary: #2e9bff;
  --color-primary-hover: #5cb2ff;
  --color-primary-active: #1b7fe0;
  --color-primary-highlight: #7dc4ff;

  --shadow-sm: 0 1px 2px oklch(0.05 0.03 240 / 0.35);
  --shadow-md: 0 8px 24px oklch(0.05 0.03 240 / 0.45);
  --shadow-lg: 0 20px 48px oklch(0.03 0.03 240 / 0.55);
}

/* ---------------- LIGHT MODE (day variant) ---------------- */
[data-theme='light'] {
  --color-bg: #f4f7fc;
  --color-bg-2: #eaf0fa;
  --color-surface: #ffffff;
  --color-surface-2: #f7f9fd;
  --color-surface-offset: #eef2fa;
  --color-border: oklch(0.3 0.05 240 / 0.12);
  --color-divider: oklch(0.3 0.05 240 / 0.09);

  --color-text: #0b1f3a;
  --color-text-muted: #46577a;
  --color-text-faint: #7c8caa;
  --color-text-inverse: #f4f8ff;

  --color-primary: #1b7fe0;
  --color-primary-hover: #1467bd;
  --color-primary-active: #0f5296;
  --color-primary-highlight: #cfe6ff;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 240 / 0.06);
  --shadow-md: 0 8px 24px oklch(0.2 0.02 240 / 0.08);
  --shadow-lg: 0 20px 48px oklch(0.2 0.02 240 / 0.1);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --color-bg: #f4f7fc;
    --color-bg-2: #eaf0fa;
    --color-surface: #ffffff;
    --color-surface-2: #f7f9fd;
    --color-surface-offset: #eef2fa;
    --color-border: oklch(0.3 0.05 240 / 0.12);
    --color-divider: oklch(0.3 0.05 240 / 0.09);
    --color-text: #0b1f3a;
    --color-text-muted: #46577a;
    --color-text-faint: #7c8caa;
    --color-text-inverse: #f4f8ff;
    --color-primary: #1b7fe0;
    --color-primary-hover: #1467bd;
    --color-primary-active: #0f5296;
    --color-primary-highlight: #cfe6ff;
    --shadow-sm: 0 1px 2px oklch(0.2 0.02 240 / 0.06);
    --shadow-md: 0 8px 24px oklch(0.2 0.02 240 / 0.08);
    --shadow-lg: 0 20px 48px oklch(0.2 0.02 240 / 0.1);
  }
}

/* =================== LAYOUT PRIMITIVES =================== */

.container {
  width: 100%;
  max-width: var(--content-wide);
  margin-inline: auto;
  padding-inline: clamp(var(--space-5), 5vw, var(--space-12));
}

.container--narrow {
  max-width: var(--content-default);
}

section {
  position: relative;
}

.section-pad {
  padding-block: clamp(var(--space-16), 9vw, var(--space-32));
}
.section-pad--tight {
  padding-block: clamp(var(--space-10), 6vw, var(--space-20));
}

/* =================== TYPE UTILITIES =================== */

.eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-primary);
}

h1,
.h1 {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.01em;
}
h2,
.h2 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
}
h3,
.h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
}

.lede {
  font-size: var(--text-lg);
  color: var(--color-text-muted);
  max-width: 46ch;
}

.text-muted {
  color: var(--color-text-muted);
}

/* =================== HEADER / NAV =================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in oklab, var(--color-bg) 88%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--color-divider);
}

.nav-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-base);
  color: var(--color-text);
  text-decoration: none;
}

.brand-mark {
  width: 36px;
  height: 36px;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  list-style: none;
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
}
.nav-links a:hover {
  color: var(--color-text);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.nav-toggle {
  display: none;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}
.theme-toggle:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
}

.mobile-menu-btn {
  display: none;
  width: 40px;
  height: 40px;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text);
}

/* =================== BUTTONS =================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: 0.85em 1.6em;
  border-radius: var(--radius-full);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1.2;
}

.btn--primary {
  background: var(--color-primary);
  color: #04101f;
}
.btn--primary:hover {
  background: var(--color-primary-hover);
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--color-primary) 25%, transparent);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn--ghost:hover {
  border-color: var(--color-primary);
  color: var(--color-primary-highlight);
}

.btn--sm {
  padding: 0.6em 1.3em;
  font-size: var(--text-xs);
}

/* =================== HERO =================== */

.hero {
  position: relative;
  min-height: 92vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 78% center;
}

.hero-scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(
    100deg,
    color-mix(in oklab, var(--color-bg) 96%, transparent) 0%,
    color-mix(in oklab, var(--color-bg) 78%, transparent) 32%,
    color-mix(in oklab, var(--color-bg) 30%, transparent) 58%,
    color-mix(in oklab, var(--color-bg) 8%, transparent) 100%
  );
}

.hero-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(var(--space-16), 10vw, var(--space-24));
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  font-size: var(--text-hero);
  color: var(--color-text);
  margin-block: var(--space-5) var(--space-6);
}

.hero h1 em {
  font-style: normal;
  color: var(--color-primary-highlight);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  margin-top: var(--space-10);
}

.hero-scroll-cue {
  position: absolute;
  bottom: var(--space-8);
  left: clamp(var(--space-5), 5vw, var(--space-12));
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.hero-scroll-cue svg {
  animation: bob 2.2s ease-in-out infinite;
}

@keyframes bob {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(6px);
  }
}

/* =================== CREDENTIAL STRIP =================== */

.credential-strip {
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
  background: var(--color-surface);
}

.credential-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-8);
  padding-block: var(--space-10);
}

.credential-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
}

.credential-item svg {
  flex-shrink: 0;
  color: var(--color-primary);
  margin-top: 2px;
}

.credential-item strong {
  display: block;
  font-size: var(--text-sm);
  color: var(--color-text);
  font-weight: 600;
}

.credential-item span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* =================== ABOUT / BIO =================== */

.about-grid {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
}

.about-portrait {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 4 / 5;
  box-shadow: var(--shadow-lg);
}

.about-portrait img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.about-portrait::after {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  border: 1px solid color-mix(in oklab, var(--color-primary) 30%, transparent);
}

.about-copy p {
  color: var(--color-text-muted);
  margin-top: var(--space-5);
  font-size: var(--text-base);
}

.about-copy p:first-of-type {
  margin-top: var(--space-6);
}

.about-copy strong {
  color: var(--color-text);
}

/* =================== WORK WITH ME =================== */

.work-list {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: var(--space-6);
  margin-top: var(--space-12);
}

.work-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.work-card--feature {
  background: linear-gradient(
    150deg,
    var(--color-surface) 0%,
    color-mix(in oklab, var(--color-primary) 12%, var(--color-surface)) 100%
  );
  border-color: color-mix(in oklab, var(--color-primary) 40%, transparent);
}

.work-card .icon-wrap {
  color: var(--color-primary);
}

.work-card h3 {
  color: var(--color-text);
}

.work-card p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  flex: 1;
}

.work-card a {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}
.work-card a:hover {
  color: var(--color-primary-hover);
  gap: var(--space-3);
}

/* =================== PILLARS =================== */

.pillars-wrap {
  margin-top: var(--space-12);
  display: flex;
  flex-direction: column;
}

.pillar-row {
  display: grid;
  grid-template-columns: 60px 1fr auto;
  align-items: center;
  gap: var(--space-6);
  padding-block: var(--space-8);
  border-top: 1px solid var(--color-divider);
}

.pillar-row:last-child {
  border-bottom: 1px solid var(--color-divider);
}

.pillar-num {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: var(--color-primary);
  font-weight: 700;
}

.pillar-body h3 {
  color: var(--color-text);
  margin-bottom: var(--space-2);
}

.pillar-body p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  max-width: 56ch;
}

.pillar-tag {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: right;
  white-space: nowrap;
}

/* =================== BOOK =================== */

.book-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.book-grid {
  display: grid;
  grid-template-columns: 0.55fr 1fr;
  gap: clamp(var(--space-10), 6vw, var(--space-20));
  align-items: center;
}

.book-cover-wrap {
  position: relative;
  max-width: 280px;
}

.book-cover-art {
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  aspect-ratio: 3 / 4;
  object-fit: cover;
  position: relative;
}

.book-cover-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: var(--space-6);
  border-radius: var(--radius-md);
  background: linear-gradient(
    to top,
    color-mix(in oklab, var(--color-bg) 55%, transparent) 0%,
    transparent 55%
  );
}

.book-cover-overlay .kicker {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-primary-highlight);
}

.book-cover-overlay h4 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--text-lg);
  color: #ffffff;
  line-height: 1.2;
  margin-top: var(--space-2);
}

.book-cover-overlay .author {
  font-size: var(--text-xs);
  color: #d7e6ff;
  margin-top: var(--space-2);
}

.book-copy .stars {
  display: flex;
  gap: var(--space-1);
  color: var(--color-primary);
  margin-bottom: var(--space-4);
}

.book-copy p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-5);
}

.book-actions {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

/* =================== NEWSLETTER =================== */

.newsletter-band {
  background: linear-gradient(120deg, var(--color-bg) 0%, var(--color-bg-2) 100%);
  border-radius: var(--radius-xl);
  padding: clamp(var(--space-10), 6vw, var(--space-16));
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: var(--space-10);
  align-items: center;
  border: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

.newsletter-band::before {
  content: '';
  position: absolute;
  width: 420px;
  height: 420px;
  right: -140px;
  top: -160px;
  background: radial-gradient(
    circle,
    color-mix(in oklab, var(--color-primary) 35%, transparent) 0%,
    transparent 70%
  );
  filter: blur(10px);
  pointer-events: none;
}

.newsletter-form {
  display: flex;
  gap: var(--space-3);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.newsletter-form input {
  flex: 1;
  min-width: 220px;
  background: color-mix(in oklab, var(--color-bg) 60%, var(--color-surface));
  border: 1px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 0.85em 1.4em;
  color: var(--color-text);
  font-size: var(--text-sm);
}

.newsletter-form input::placeholder {
  color: var(--color-text-faint);
}

.newsletter-stats {
  display: flex;
  gap: var(--space-8);
  margin-top: var(--space-6);
}

.newsletter-stats div strong {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-text);
}
.newsletter-stats div span {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

/* =================== FOOTER =================== */

.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-12);
}

.footer-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-6);
}

.footer-links {
  display: flex;
  gap: var(--space-6);
  list-style: none;
}

.footer-links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
}
.footer-links a:hover {
  color: var(--color-primary);
}

.social-row {
  display: flex;
  gap: var(--space-3);
}

.social-row a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
}
.social-row a:hover {
  color: var(--color-primary);
  border-color: var(--color-primary);
}

/* =================== SCROLL REVEAL =================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.7s var(--ease-out),
    transform 0.7s var(--ease-out);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* =================== RESPONSIVE =================== */

@media (max-width: 900px) {
  .about-grid,
  .book-grid {
    grid-template-columns: 1fr;
  }
  .about-portrait {
    max-width: 380px;
    margin-inline: auto;
  }
  .book-cover-wrap {
    margin-inline: auto;
  }
  .work-list {
    grid-template-columns: 1fr;
  }
  .credential-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .newsletter-band {
    grid-template-columns: 1fr;
  }
  .pillar-row {
    grid-template-columns: 44px 1fr;
  }
  .pillar-tag {
    grid-column: 2 / 3;
    text-align: left;
    margin-top: var(--space-2);
  }
}

@media (max-width: 760px) {
  .nav-links {
    position: fixed;
    inset: 64px var(--space-5) auto var(--space-5);
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-6);
    gap: var(--space-5);
    box-shadow: var(--shadow-lg);
    transform-origin: top;
    transform: scaleY(0);
    opacity: 0;
    pointer-events: none;
    transition:
      transform 0.25s var(--ease-out),
      opacity 0.25s var(--ease-out);
  }
  .nav-links.is-open {
    transform: scaleY(1);
    opacity: 1;
    pointer-events: auto;
  }
  .mobile-menu-btn {
    display: inline-flex;
  }
  .credential-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-6);
  }
  .hero-bg {
    object-position: 65% center;
  }
  .hero-scrim {
    background: linear-gradient(
      180deg,
      color-mix(in oklab, var(--color-bg) 55%, transparent) 0%,
      color-mix(in oklab, var(--color-bg) 88%, transparent) 62%,
      color-mix(in oklab, var(--color-bg) 96%, transparent) 100%
    );
  }
}

@media (max-width: 520px) {
  .credential-grid {
    grid-template-columns: 1fr;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .newsletter-form {
    flex-direction: column;
  }
}