/* ==========================================================================
   Robert Konow Portfolio — Dark Studio Aesthetic
   Inspired by leading design studio websites: dark-first, typographically
   driven, high-contrast monochromatic with warm accent
   ========================================================================== */

/* --------------------------------------------------------------------------
   CSS Custom Properties
   -------------------------------------------------------------------------- */
:root {
  /* Colors — Dark-first, high-contrast monochromatic */
  --color-bg: #0A0A0A;
  --color-surface: #111111;
  --color-surface-elevated: #1A1A1A;
  --color-text-primary: #F0F0F0;
  --color-text-secondary: #A0A0A0;
  --color-text-muted: #666666;
  --color-accent: #D4A853;
  --color-accent-hover: #E8C170;
  --color-border: rgba(255, 255, 255, 0.08);
  --color-border-strong: rgba(255, 255, 255, 0.15);

  /* Typography — Geometric sans-serif + monospace accents */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Space Mono', 'SFMono-Regular', Consolas, monospace;
  --font-size-xs: 0.6875rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.75rem;
  --font-size-5xl: 4rem;

  /* 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;

  /* Layout */
  --max-width: 1200px;
  --max-width-prose: 720px;
  --nav-height: 64px;

  /* Effects */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.5);
  --radius-sm: 2px;
  --radius-md: 4px;
  --radius-lg: 8px;
  --transition: 200ms ease;
  --transition-slow: 400ms cubic-bezier(0.25, 0.1, 0.25, 1);
}

/* --------------------------------------------------------------------------
   Light Theme
   -------------------------------------------------------------------------- */
[data-theme="light"] {
  --color-bg: #F5F5F0;
  --color-surface: #FFFFFF;
  --color-surface-elevated: #EBEBEB;
  --color-text-primary: #1A1A1A;
  --color-text-secondary: #4A4A4A;
  --color-text-muted: #808080;
  --color-accent: #B8860B;
  --color-accent-hover: #9A7209;
  --color-border: rgba(0, 0, 0, 0.08);
  --color-border-strong: rgba(0, 0, 0, 0.15);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
}

[data-theme="light"] .nav {
  background: rgba(245, 245, 240, 0.9);
}

/* --------------------------------------------------------------------------
   Theme Toggle
   -------------------------------------------------------------------------- */
.theme-toggle {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: var(--space-1) var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  transition: color var(--transition), border-color var(--transition);
  display: flex;
  align-items: center;
  gap: var(--space-2);
  line-height: 1;
}

.theme-toggle:hover {
  color: var(--color-text-primary);
  border-color: var(--color-border-strong);
}


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

html {
  scroll-behavior: smooth;
  transition: background-color 0.3s ease, color 0.3s ease;
}

body {
  margin: 0;
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.7;
  color: var(--color-text-secondary);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--color-text-primary);
  text-decoration: none;
  transition: color var(--transition), opacity var(--transition);
}

a:hover {
  color: var(--color-accent);
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  color: var(--color-text-primary);
  line-height: 1.15;
  font-weight: 500;
  letter-spacing: -0.03em;
}

h1 { font-size: var(--font-size-5xl); font-weight: 400; }
h2 { font-size: var(--font-size-3xl); font-weight: 400; }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p {
  margin: 0 0 var(--space-4);
}

p:last-child {
  margin-bottom: 0;
}

/* --------------------------------------------------------------------------
   Layout Utilities
   -------------------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

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

.section {
  padding: var(--space-24) 0;
}

.section--tight {
  padding: var(--space-16) 0;
}

/* --------------------------------------------------------------------------
   Navigation
   -------------------------------------------------------------------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 10, 10, 0.9);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  height: var(--nav-height);
}

.nav__inner {
  display: flex;
  align-items: center;
  height: 100%;
  gap: var(--space-8);
}

.nav__brand {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  font-weight: 400;
  color: var(--color-text-primary);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.nav__brand:hover {
  color: var(--color-text-primary);
}

.nav__links {
  display: flex;
  gap: var(--space-10);
  list-style: none;
  margin: 0 0 0 auto;
  padding: 0;
}

.nav__link {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  padding: var(--space-2) 0;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border-bottom: none;
  transition: color var(--transition);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-text-primary);
}

.nav__toggle {
  display: none;
  background: none;
  border: none;
  padding: var(--space-2);
  cursor: pointer;
}

.nav__toggle-icon {
  display: block;
  width: 20px;
  height: 1px;
  background: var(--color-text-primary);
  position: relative;
}

.nav__toggle-icon::before,
.nav__toggle-icon::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--color-text-primary);
}

.nav__toggle-icon::before { top: -6px; }
.nav__toggle-icon::after { bottom: -6px; }

/* Mobile Nav */
@media (max-width: 768px) {
  .nav__toggle {
    display: block;
  }

  .nav__links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(10, 10, 10, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border);
    padding: var(--space-6) var(--space-6);
    gap: var(--space-4);
    display: none;
    margin-left: 0;
  }

  [data-theme="light"] .nav__links {
    background: rgba(245, 245, 240, 0.98);
  }

  .nav__links--open {
    display: flex;
  }
}

/* --------------------------------------------------------------------------
   Hero Section
   -------------------------------------------------------------------------- */
.hero {
  padding: var(--space-32) 0 var(--space-24);
  text-align: left;
  background: var(--color-bg);
}

.hero__title {
  margin-bottom: var(--space-4);
  letter-spacing: -0.04em;
  line-height: 1.05;
}

.hero__subtitle {
  font-family: var(--font-mono);
  font-size: var(--font-size-sm);
  color: var(--color-accent);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-8);
}

.hero__tagline {
  font-size: var(--font-size-xl);
  color: var(--color-text-secondary);
  max-width: 600px;
  margin: 0 0 var(--space-10);
  line-height: 1.6;
}

.hero__cta {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  border-bottom: 1px solid var(--color-accent);
  transition: all var(--transition);
}

.hero__cta:hover {
  color: var(--color-accent-hover);
  border-bottom-color: var(--color-accent-hover);
  padding-bottom: var(--space-3);
}

/* Case Study Hero */
.hero--case-study {
  text-align: left;
  padding: var(--space-24) 0 var(--space-16);
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-10);
  margin-top: var(--space-8);
}

.hero__meta-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  font-size: var(--font-size-sm);
  color: var(--color-text-secondary);
}

.hero__meta-label {
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  font-size: var(--font-size-xs);
}

/* --------------------------------------------------------------------------
   Impact Metrics
   -------------------------------------------------------------------------- */
.metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--color-border);
}

@media (max-width: 768px) {
  .metrics {
    grid-template-columns: repeat(2, 1fr);
  }
}

.metric {
  text-align: left;
  padding: var(--space-8) var(--space-6);
  background: var(--color-bg);
}

.metric__number {
  font-size: var(--font-size-4xl);
  font-weight: 400;
  color: var(--color-text-primary);
  line-height: 1;
  margin-bottom: var(--space-3);
  letter-spacing: -0.03em;
}

.metric__label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-2);
}

.metric__detail {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* --------------------------------------------------------------------------
   Section Headers
   -------------------------------------------------------------------------- */
.section__header {
  margin-bottom: var(--space-12);
}

.section__title {
  margin-bottom: var(--space-3);
}

.section__subtitle {
  color: var(--color-text-muted);
  font-size: var(--font-size-lg);
}

/* --------------------------------------------------------------------------
   Case Study Cards
   -------------------------------------------------------------------------- */
.case-studies-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
}

@media (max-width: 900px) {
  .case-studies-grid {
    grid-template-columns: 1fr;
  }
}

.case-study-card {
  background: var(--color-bg);
  overflow: hidden;
  transition: background var(--transition-slow);
  display: block;
}

.case-study-card:hover {
  background: var(--color-surface);
}

.case-study-card:hover .case-study-card__image {
  opacity: 0.85;
}

.case-study-card__image {
  aspect-ratio: 16 / 10;
  background: var(--color-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity var(--transition-slow);
}

.case-study-card__content {
  padding: var(--space-6) var(--space-6) var(--space-8);
}

.case-study-card__company {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-3);
}

.case-study-card__title {
  font-size: var(--font-size-xl);
  font-weight: 500;
  margin-bottom: var(--space-3);
  letter-spacing: -0.02em;
}

.case-study-card__subtitle {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-6);
  line-height: 1.6;
}

.case-study-card__link {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.case-study-card__link::after {
  content: '\2192';
  transition: transform var(--transition);
}

.case-study-card:hover .case-study-card__link::after {
  transform: translateX(6px);
}

/* --------------------------------------------------------------------------
   Logo Grids
   -------------------------------------------------------------------------- */
.logo-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--space-3);
}

.logo-item {
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-text-muted);
  font-size: var(--font-size-xs);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  border: 1px solid var(--color-border);
  transition: all var(--transition);
}

.logo-item:hover {
  border-color: var(--color-border-strong);
  color: var(--color-text-secondary);
}

/* --------------------------------------------------------------------------
   About / Philosophy Section
   -------------------------------------------------------------------------- */
.about-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-12);
  align-items: start;
}

@media (max-width: 900px) {
  .about-preview {
    grid-template-columns: 1fr;
  }
}

.about-preview__image {
  aspect-ratio: 1;
  background: var(--color-surface-elevated);
  display: flex;
  align-items: center;
  justify-content: center;
}

.about-preview__content h2 {
  margin-bottom: var(--space-6);
}

.about-preview__text {
  font-size: var(--font-size-lg);
  margin-bottom: var(--space-6);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   Case Study Content
   -------------------------------------------------------------------------- */
.case-study-content {
  padding: var(--space-20) 0;
}

.case-study-section {
  margin-bottom: var(--space-20);
}

.case-study-section:last-child {
  margin-bottom: 0;
}

.case-study-section__title {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  margin-bottom: var(--space-4);
}

.case-study-section h2 {
  margin-bottom: var(--space-6);
}

.case-study-section h3 {
  margin-bottom: var(--space-4);
}

.case-study-section p {
  font-size: var(--font-size-lg);
  line-height: 1.8;
}

/* Action List */
.action-list {
  list-style: none;
  padding: 0;
  margin: var(--space-8) 0;
}

.action-item {
  padding: var(--space-6) 0;
  border-bottom: 1px solid var(--color-border);
}

.action-item:first-child {
  border-top: 1px solid var(--color-border);
}

.action-item:last-child {
  margin-bottom: 0;
}

.action-item__title {
  font-weight: 500;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.01em;
}

.action-item__description {
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.7;
}

/* Results */
.results-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

@media (max-width: 768px) {
  .results-grid {
    grid-template-columns: 1fr;
  }
}

.result-card {
  padding: var(--space-8) var(--space-6);
  background: var(--color-bg);
}

.result-card__label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-3);
}

.result-card__value {
  font-size: var(--font-size-3xl);
  font-weight: 400;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
  letter-spacing: -0.03em;
}

.result-card__context {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

.result-card--before-after {
  display: flex;
  flex-direction: column;
}

.result-card__change {
  font-size: var(--font-size-3xl);
  font-weight: 400;
  color: var(--color-accent);
  letter-spacing: -0.03em;
}

/* Qualitative Results */
.qualitative-list {
  list-style: none;
  padding: 0;
  margin: var(--space-8) 0;
}

.qualitative-list li {
  padding: var(--space-4) 0;
  padding-left: var(--space-6);
  position: relative;
  border-bottom: 1px solid var(--color-border);
  font-size: var(--font-size-base);
  color: var(--color-text-secondary);
}

.qualitative-list li:first-child {
  border-top: 1px solid var(--color-border);
}

.qualitative-list li:last-child {
  border-bottom: 1px solid var(--color-border);
}

.qualitative-list li::before {
  content: '\2014';
  position: absolute;
  left: 0;
  color: var(--color-text-muted);
  font-weight: 400;
}

/* Testimonials */
.testimonial {
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
  margin: var(--space-8) 0;
}

.testimonial__quote {
  font-size: var(--font-size-xl);
  font-style: normal;
  color: var(--color-text-primary);
  margin-bottom: var(--space-4);
  line-height: 1.6;
  letter-spacing: -0.01em;
}

.testimonial__attribution {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.testimonial__name {
  color: var(--color-text-secondary);
}

/* Reflection */
.reflection-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--color-border);
  margin: var(--space-8) 0;
}

@media (max-width: 768px) {
  .reflection-grid {
    grid-template-columns: 1fr;
  }
}

.reflection-card {
  padding: var(--space-6);
  background: var(--color-bg);
}

.reflection-card__label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: var(--space-3);
}

.reflection-card--highlight {
  grid-column: 1 / -1;
  background: var(--color-surface);
  border-left: 2px solid var(--color-accent);
}

/* --------------------------------------------------------------------------
   Image Placeholders
   -------------------------------------------------------------------------- */
.image-placeholder {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-12);
  min-height: 200px;
  margin: var(--space-8) 0;
}

.image-placeholder--hero {
  min-height: 320px;
  margin: 0;
  border-left: none;
  border-right: none;
}

.placeholder-label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-align: center;
  max-width: 400px;
  letter-spacing: 0.05em;
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   Case Study Navigation
   -------------------------------------------------------------------------- */
.case-study-nav {
  display: flex;
  justify-content: space-between;
  padding: var(--space-8) 0;
  border-top: 1px solid var(--color-border);
  margin-top: var(--space-20);
}

.case-study-nav__link {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  max-width: 45%;
  transition: opacity var(--transition);
}

.case-study-nav__link:hover {
  color: var(--color-text-primary);
}

.case-study-nav__link--prev {
  align-items: flex-start;
}

.case-study-nav__link--next {
  align-items: flex-end;
  margin-left: auto;
}

.case-study-nav__label {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.case-study-nav__title {
  font-weight: 500;
  color: var(--color-text-primary);
  letter-spacing: -0.01em;
}

/* --------------------------------------------------------------------------
   Footer
   -------------------------------------------------------------------------- */
.footer {
  padding: var(--space-12) 0;
  border-top: 1px solid var(--color-border);
}

.footer__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}

.footer__copyright {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.footer__links {
  display: flex;
  gap: var(--space-8);
}

.footer__link {
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.05em;
}

.footer__link:hover {
  color: var(--color-accent);
}

/* --------------------------------------------------------------------------
   Button Styles
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-8);
  font-family: var(--font-mono);
  font-size: var(--font-size-xs);
  font-weight: 400;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
}

.btn--primary:hover {
  background: var(--color-accent-hover);
  color: var(--color-bg);
}

.btn--secondary {
  background: transparent;
  color: var(--color-accent);
  border: 1px solid var(--color-accent);
}

.btn--secondary:hover {
  background: var(--color-accent);
  color: var(--color-bg);
}

/* --------------------------------------------------------------------------
   Utility Classes
   -------------------------------------------------------------------------- */
.text-center { text-align: center; }
.text-muted { color: var(--color-text-muted); }
.mt-4 { margin-top: var(--space-4); }
.mt-8 { margin-top: var(--space-8); }
.mb-4 { margin-bottom: var(--space-4); }
.mb-8 { margin-bottom: var(--space-8); }

/* --------------------------------------------------------------------------
   Responsive Adjustments
   -------------------------------------------------------------------------- */
@media (max-width: 768px) {
  :root {
    --font-size-5xl: 2.5rem;
    --font-size-4xl: 2rem;
    --font-size-3xl: 1.5rem;
  }

  .hero {
    padding: var(--space-20) 0 var(--space-16);
  }

  .hero--case-study {
    padding: var(--space-16) 0 var(--space-12);
  }

  .hero__meta {
    gap: var(--space-6);
  }

  .section {
    padding: var(--space-16) 0;
  }

  .case-study-section {
    margin-bottom: var(--space-16);
  }

  .case-study-nav {
    flex-direction: column;
    gap: var(--space-6);
  }

  .case-study-nav__link {
    max-width: 100%;
  }

  .case-study-nav__link--next {
    align-items: flex-start;
    margin-left: 0;
  }
}