/* ============================================
   OSAMA KHEDR - SYSTEMS ARCHITECT
   Main Stylesheet - Blueprint Design System
   
   TABLE OF CONTENTS:
   1. CSS Custom Properties (Variables)
   2. Base & Reset Styles
   3. Typography
   4. Layout & Grid System
   5. Paper Texture & Background
   6. Navigation
   7. Sections (Common)
   8. Hero Section
   9. Story Section
   10. Protocols Section
   11. Contact Section
   12. Footer
   13. Components (Buttons, Badges, Forms, Cards)
   14. Sketch Effects
   15. Ink Wash Effects
   16. Cube & Canvas
   17. Animations & Keyframes
   18. Utilities
   19. Responsive Breakpoints
   20. Print Styles
   21. Reduced Motion
   ============================================ */

/* ============================================
   1. CSS CUSTOM PROPERTIES
   ============================================ */
:root {
    /* Color Palette */
    --color-paper: #F5F3EF;
    --color-paper-dark: #EBE8E2;
    --color-paper-rgb: 245, 243, 239;
    
    --color-charcoal: #2A2A2A;
    --color-charcoal-light: #4A4A4A;
    --color-charcoal-rgb: 42, 42, 42;
    
    --color-violet: #5B21B6;
    --color-violet-deep: #4C1D95;
    --color-violet-light: #7C3AED;
    --color-violet-rgb: 91, 33, 182;
    --color-violet-wash: rgba(91, 33, 182, 0.15);
    --color-violet-glow: rgba(91, 33, 182, 0.3);
    
    /* Typography */
    --font-primary: 'JetBrains Mono', 'Fira Code', 'SF Mono', 'Consolas', monospace;
    --font-handwritten: 'Neucha', 'Caveat', cursive;
    --font-size-xs: clamp(0.625rem, 0.5rem + 0.5vw, 0.75rem);
    --font-size-sm: clamp(0.75rem, 0.65rem + 0.5vw, 0.875rem);
    --font-size-base: clamp(0.875rem, 0.8rem + 0.4vw, 1rem);
    --font-size-lg: clamp(1rem, 0.9rem + 0.5vw, 1.25rem);
    --font-size-xl: clamp(1.25rem, 1rem + 1vw, 1.5rem);
    --font-size-2xl: clamp(1.5rem, 1.2rem + 1.5vw, 2rem);
    --font-size-3xl: clamp(1.875rem, 1.4rem + 2vw, 2.5rem);
    --font-size-4xl: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
    --font-size-5xl: clamp(2.75rem, 1.8rem + 4vw, 4.5rem);
    
    /* Spacing */
    --space-xs: clamp(0.25rem, 0.2rem + 0.25vw, 0.5rem);
    --space-sm: clamp(0.5rem, 0.4rem + 0.5vw, 0.75rem);
    --space-md: clamp(1rem, 0.8rem + 1vw, 1.5rem);
    --space-lg: clamp(1.5rem, 1rem + 2vw, 2.5rem);
    --space-xl: clamp(2rem, 1.5rem + 2.5vw, 4rem);
    --space-2xl: clamp(3rem, 2rem + 4vw, 6rem);
    --space-3xl: clamp(4rem, 3rem + 5vw, 8rem);
    
    /* Layout */
    --container-max: 1280px;
    --container-padding: clamp(1rem, 3vw, 3rem);
    --section-padding: clamp(4rem, 10vh, 8rem);
    
    /* Borders & Shadows */
    --border-width: 2px;
    --border-width-thick: 3px;
    --border-color: var(--color-charcoal);
    --border-radius: 0;
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 500ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* Z-Index Scale */
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal: 400;
    --z-popover: 500;
    --z-loading: 9999;
    
    /* Sketch Effect */
    --sketch-overshoot: 8px;
}

/* ============================================
   2. BASE & RESET STYLES
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
    text-size-adjust: 100%;
    scroll-padding-top: 5rem;
}

body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.7;
    color: var(--color-charcoal);
    background-color: var(--color-paper);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

/* Focus Styles */
:focus {
    outline: 2px solid var(--color-violet);
    outline-offset: 2px;
}

:focus:not(:focus-visible) {
    outline: none;
}

:focus-visible {
    outline: 2px solid var(--color-violet);
    outline-offset: 2px;
}

/* Selection */
::selection {
    background: var(--color-violet-wash);
    color: var(--color-charcoal);
}

/* Links */
a {
    color: inherit;
    text-decoration: none;
    transition: color var(--transition-fast);
}

/* Images */
img,
picture,
video,
canvas,
svg {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Lists */
ul,
ol {
    list-style: none;
}

/* ============================================
   3. TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

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

strong {
    font-weight: 600;
}

/* ============================================
   4. LAYOUT & GRID SYSTEM
   ============================================ */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding-inline: var(--container-padding);
}

.section {
    position: relative;
    padding-block: var(--section-padding);
    overflow: visible;
}

/* Ensure all sections are visible */
.section--story,
.section--protocols,
.section--contact {
    display: block !important;
    visibility: visible !important;
    opacity: 1 !important;
}

.section__background {
    position: absolute;
    inset: 0;
    pointer-events: none;
    z-index: 0;
}

.section__header {
    text-align: center;
    margin-bottom: var(--space-2xl);
}

.section__title {
    font-size: var(--font-size-4xl);
    margin-top: var(--space-md);
}

.section__title--center {
    text-align: center;
}

/* ============================================
   5. PAPER TEXTURE & BACKGROUND
   ============================================ */
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: var(--z-base);
    opacity: 0.3;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 400 400' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.8' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

.grid-overlay {
    position: absolute;
    inset: 0;
    opacity: 0.08;
    background-image: 
        linear-gradient(var(--color-charcoal) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-charcoal) 1px, transparent 1px);
    background-size: 50px 50px;
}

/* ============================================
   6. NAVIGATION - Notebook Header Style
   ============================================ */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    padding: var(--space-md) var(--container-padding);
    background: rgba(250, 248, 244, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
    border-bottom: 1px solid rgba(42, 42, 42, 0.1);
}

.nav--scrolled {
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

.nav--hidden {
    transform: translateY(-100%);
}

.nav__container {
    max-width: var(--container-max);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-lg);
}

.nav__logo {
    display: flex;
    align-items: center;
    color: var(--color-charcoal);
    transition: all var(--transition-fast);
}

.nav__logo-svg {
    width: 160px;
    height: 50px;
    transition: all var(--transition-fast);
}

.nav__logo:hover {
    color: var(--color-violet);
}

.nav__logo:hover .nav__logo-svg {
    transform: rotate(-0.5deg);
}

/* Hide text for screen readers only */
.nav__logo-text.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.nav__menu {
    display: none;
    align-items: center;
    gap: var(--space-xl);
}

.nav__link {
    position: relative;
    font-family: var(--font-handwritten);
    font-size: 1rem;
    letter-spacing: 0.1em;
    padding: var(--space-xs) var(--space-sm);
    transition: color 0.2s ease;
}

.nav__link::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-violet);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav__link:hover {
    color: var(--color-violet);
}

.nav__link:hover::after,
.nav__link:focus::after {
    width: 80%;
}

.nav__link--cta {
    padding: var(--space-xs) var(--space-md);
    border: 2px solid var(--color-charcoal);
    background: var(--color-paper);
    transition: all 0.2s ease;
    filter: url(#pencilSketch);
}

.nav__link--cta::after {
    display: none;
}

.nav__link--cta:hover {
    background: var(--color-charcoal);
    color: var(--color-paper);
    transform: rotate(-1deg);
}
}

/* Mobile Nav Toggle */
.nav__toggle {
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 10px;
    background: var(--color-paper);
    border: 2px solid var(--color-charcoal);
    cursor: pointer;
    transition: all 0.2s ease;
    position: relative;
    z-index: calc(var(--z-fixed) + 10);
}

.nav__toggle:hover {
    border-color: var(--color-violet);
}

.nav__toggle-line {
    width: 22px;
    height: 2px;
    background: var(--color-charcoal);
    transition: all 0.3s ease;
    transform-origin: center;
}

.nav__toggle[aria-expanded="true"] {
    border-color: var(--color-violet);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
    background: var(--color-violet);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
    background: var(--color-violet);
}

/* Mobile Menu */
.nav__mobile {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--color-paper);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-100%);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    z-index: calc(var(--z-fixed) - 1);
    padding-top: 80px;
}

.nav__mobile[aria-hidden="false"] {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav__mobile-menu {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-lg);
}

.nav__mobile-link {
    font-family: var(--font-primary);
    font-size: 1.5rem;
    font-weight: 500;
    letter-spacing: 0.1em;
    padding: var(--space-md) var(--space-xl);
    position: relative;
    transition: all 0.2s ease;
    color: var(--color-charcoal);
}

.nav__mobile-link:hover {
    color: var(--color-violet);
}

/* ============================================
   7. HERO SECTION
   ============================================ */
.hero-section {
    min-height: 100vh;
    min-height: 100dvh;
    display: flex;
    align-items: center;
    padding-top: 8rem;
}

.hero__grid {
    display: grid;
    gap: var(--space-xl);
    align-items: center;
}

.hero__content {
    max-width: 600px;
}

.hero__title {
    font-size: var(--font-size-5xl);
    margin: var(--space-md) 0 var(--space-lg);
}

.hero__subtitle {
    font-family: var(--font-handwritten);
    font-size: 1.4rem;
    line-height: 1.7;
    color: var(--color-charcoal-light);
    margin-bottom: var(--space-xl);
    max-width: 540px;
}

.hero__visual {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 400px;
    width: 100%;
}

.cube-scene {
    position: relative;
    z-index: 2;
    width: 400px;
    height: 400px;
    max-width: 100%;
}

.cube-sketch {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.cube-glow {
    position: absolute;
    width: 300px;
    height: 300px;
    background: radial-gradient(ellipse at center, var(--color-violet-glow) 0%, transparent 60%);
    filter: blur(60px);
    z-index: 1;
    animation: pulse-glow 4s ease-in-out infinite;
}

.cube-glow--large {
    width: 350px;
    height: 350px;
    filter: blur(80px);
}

/* Scroll Indicator */
.scroll-indicator {
    position: absolute;
    bottom: var(--space-lg);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-sm);
    animation: float 2s ease-in-out infinite;
}

.scroll-indicator__text {
    font-size: var(--font-size-xs);
    letter-spacing: 0.2em;
    color: var(--color-charcoal-light);
}

.scroll-indicator__line {
    width: 1px;
    height: 48px;
    background: var(--color-charcoal);
    opacity: 0.3;
    animation: scroll-pulse 2s ease-in-out infinite;
}

/* ============================================
   8. STORY SECTION
   ============================================ */
.section--story {
    background: linear-gradient(180deg, var(--color-paper) 0%, var(--color-paper-dark) 100%);
}

.story__grid {
    display: grid;
    gap: var(--space-xl);
}

.story__sidebar {
    display: none;
}

.story__visual {
    position: sticky;
    top: 8rem;
}

.sketch-frame {
    position: relative;
    padding: var(--space-lg);
    border: var(--border-width-thick) solid var(--color-charcoal);
    background: var(--color-paper);
    width: 200px;
    height: 200px;
    display: flex;
    align-items: center;
    justify-content: center;
    filter: url(#pencilSketch);
}

.cube-sketch-small {
    display: block;
    width: 160px;
    height: 160px;
    object-fit: contain;
}

.caption {
    display: block;
    margin-top: var(--space-sm);
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-charcoal-light);
}

.story__content {
    max-width: 700px;
}

.story__body {
    margin-top: var(--space-xl);
}

.story__paragraph {
    font-family: var(--font-handwritten);
    font-size: 1.35rem;
    line-height: 1.8;
    color: var(--color-charcoal-light);
    opacity: 1;
    transform: none;
}

.story__highlight {
    position: relative;
    padding: var(--space-lg);
    background: linear-gradient(135deg, var(--color-paper) 0%, var(--color-paper-dark) 100%);
    border-left: 4px solid var(--color-violet);
}

.story__highlight::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at left, var(--color-violet-wash) 0%, transparent 50%);
    mix-blend-mode: multiply;
    pointer-events: none;
}

.story__highlight p {
    position: relative;
    z-index: 1;
    font-family: var(--font-handwritten);
    font-size: 1.35rem;
    line-height: 1.8;
    color: var(--color-charcoal);
}

/* Divider */
.divider {
    height: 20px;
    margin: var(--space-lg) 0;
}

.divider--sketch {
    position: relative;
}

.divider--sketch::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 0;
    width: 60px;
    height: 2px;
    background: var(--color-charcoal);
    transform: translateY(-50%);
}

.divider--sketch::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 55px;
    width: 10px;
    height: 10px;
    border: 2px solid var(--color-charcoal);
    transform: translateY(-50%) rotate(45deg);
}

/* ============================================
   9. PROTOCOLS SECTION
   ============================================ */
.section--protocols {
    background: var(--color-paper);
}

.grid-canvas {
    display: none;
    justify-content: center;
    margin-bottom: var(--space-xl);
    width: 100%;
    overflow: hidden;
}

.grid-canvas canvas {
    width: 100%;
    max-width: 1000px;
    height: 120px;
}

.protocols__grid {
    display: grid;
    gap: var(--space-lg);
}

/* Protocol Card */
.protocol-card {
    position: relative;
    opacity: 1;
    transform: none;
}

.protocol-card__inner {
    position: relative;
    padding: var(--space-lg);
    border: var(--border-width) solid var(--color-charcoal);
    background: var(--color-paper);
    height: 100%;
    transition: border-color var(--transition-base), box-shadow var(--transition-base);
    overflow: hidden;
    /* Pencil sketch border effect */
    filter: url(#pencilSketch);
}

.protocol-card__ink {
    position: absolute;
    inset: 0;
    background: radial-gradient(ellipse at bottom right, var(--color-violet-wash) 0%, transparent 50%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.protocol-card:hover .protocol-card__ink {
    opacity: 1;
}

.protocol-card:hover .protocol-card__inner {
    border-color: var(--color-violet);
    box-shadow: 0 0 30px var(--color-violet-wash);
}

.protocol-card__header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
}

.protocol-card__badge {
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-charcoal-light);
}

.protocol-card__line {
    flex: 1;
    height: 1px;
    background: rgba(var(--color-charcoal-rgb), 0.2);
}

.protocol-card__icon {
    margin-bottom: var(--space-md);
    color: var(--color-violet);
}

.protocol-card__title {
    font-size: var(--font-size-xl);
    margin-bottom: var(--space-md);
    transition: color var(--transition-fast);
}

.protocol-card:hover .protocol-card__title {
    color: var(--color-violet);
}

.protocol-card__description {
    font-family: var(--font-handwritten);
    font-size: 1.15rem;
    color: var(--color-charcoal-light);
    line-height: 1.8;
}

.protocol-card__footer {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid rgba(var(--color-charcoal-rgb), 0.1);
}

.protocol-card__label {
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-violet);
}

/* ============================================
   10. CONTACT SECTION
   ============================================ */
.section--contact {
    min-height: 100vh;
    display: flex;
    align-items: center;
}

.contact__grid {
    display: grid;
    gap: var(--space-2xl);
    align-items: center;
}

.contact__visual {
    display: none;
}

.final-cube-scene {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 300px;
    height: 300px;
    max-width: 100%;
    margin: 0 auto;
}

.cube-sketch-large {
    display: block;
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.contact__subtitle {
    font-family: var(--font-handwritten);
    font-size: 1.35rem;
    line-height: 1.7;
    color: var(--color-charcoal-light);
    margin-bottom: var(--space-xl);
    max-width: 500px;
}

/* ============================================
   11. FOOTER
   ============================================ */
.footer {
    padding: var(--space-lg) 0;
    border-top: var(--border-width) solid rgba(var(--color-charcoal-rgb), 0.1);
}

.footer__inner {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
    align-items: center;
    text-align: center;
}

.footer__copyright {
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-charcoal-light);
}

.footer__copyright a {
    color: var(--color-violet);
}

.footer__copyright a:hover {
    text-decoration: underline;
}

.footer__nav {
    display: flex;
    gap: var(--space-lg);
}

.footer__link {
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-charcoal-light);
    transition: color var(--transition-fast);
}

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

/* ============================================
   12. COMPONENTS
   ============================================ */

/* Badge */
.badge {
    display: inline-block;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
    letter-spacing: 0.2em;
    color: var(--color-charcoal-light);
}

.badge--sketch {
    position: relative;
    border: var(--border-width) solid var(--color-charcoal);
    /* Pencil sketch border effect */
    filter: url(#pencilSketch);
}

/* Button */
.btn {
    position: relative;
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-md) var(--space-lg);
    font-family: inherit;
    font-size: var(--font-size-sm);
    font-weight: 500;
    letter-spacing: 0.1em;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
}

.btn--primary {
    background: var(--color-charcoal);
    color: var(--color-paper);
    /* Pencil sketch border effect */
    filter: url(#pencilSketch);
}

.btn--primary:hover {
    background: var(--color-violet);
    transform: translate(-2px, -2px);
    box-shadow: 4px 4px 0 var(--color-charcoal);
}

.btn__icon {
    transition: transform var(--transition-fast);
}

.btn:hover .btn__icon {
    transform: translateX(4px);
}

/* Form */
.form {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.form__row {
    display: grid;
    gap: var(--space-md);
}

.form__group {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.form__label {
    font-size: var(--font-size-xs);
    letter-spacing: 0.15em;
    color: var(--color-charcoal-light);
}

.form__input {
    padding: var(--space-md);
    font-family: inherit;
    font-size: var(--font-size-sm);
    color: var(--color-charcoal);
    background: transparent;
    border: var(--border-width) solid var(--color-charcoal);
    transition: all var(--transition-fast);
    outline: none;
    /* Pencil sketch border effect */
    filter: url(#pencilSketch);
}

.form__input::placeholder {
    color: var(--color-charcoal-light);
    opacity: 0.6;
}

.form__input:focus {
    border-color: var(--color-violet);
    box-shadow: 0 0 0 3px var(--color-violet-wash);
}

.form__input--textarea {
    resize: vertical;
    min-height: 120px;
}

/* ============================================
   13. INK WASH EFFECTS
   ============================================ */
.ink-wash {
    position: absolute;
    border-radius: 50%;
    background: radial-gradient(ellipse at center, var(--color-violet-wash) 0%, transparent 70%);
    mix-blend-mode: multiply;
    pointer-events: none;
    filter: blur(40px);
}

.ink-wash--1 {
    width: clamp(300px, 50vw, 600px);
    height: clamp(300px, 50vw, 600px);
    top: 10%;
    right: -10%;
    opacity: 0.6;
}

.ink-wash--2 {
    width: clamp(200px, 35vw, 400px);
    height: clamp(200px, 35vw, 400px);
    bottom: 10%;
    left: 5%;
    opacity: 0.4;
}

.ink-wash--3 {
    width: clamp(400px, 60vw, 800px);
    height: clamp(200px, 30vw, 400px);
    top: 20%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.3;
}

.ink-wash--4 {
    width: clamp(250px, 40vw, 500px);
    height: clamp(250px, 40vw, 500px);
    bottom: 20%;
    left: 10%;
    opacity: 0.5;
}

.ink-trail {
    position: absolute;
    top: 0;
    left: 20%;
    width: 4px;
    height: 100%;
    background: linear-gradient(
        to bottom,
        transparent 0%,
        var(--color-violet-wash) 20%,
        var(--color-violet) 50%,
        var(--color-violet-wash) 80%,
        transparent 100%
    );
    opacity: 0.15;
    filter: blur(2px);
    display: none;
}

.ink-spill {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 150px;
    height: 150px;
    background: radial-gradient(ellipse at center, var(--color-violet-wash) 0%, transparent 60%);
    mix-blend-mode: multiply;
    filter: blur(20px);
    opacity: 0.8;
}

/* ============================================
   14. ANIMATIONS & KEYFRAMES
   ============================================ */
@keyframes pulse-glow {
    0%, 100% { opacity: 0.4; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.1); }
}

@keyframes float {
    0%, 100% { transform: translate(-50%, 0); }
    50% { transform: translate(-50%, 10px); }
}

@keyframes scroll-pulse {
    0%, 100% { height: 48px; opacity: 0.3; }
    50% { height: 60px; opacity: 0.6; }
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Hero Content Animation */
.hero__content > * {
    opacity: 1;
}
.hero__content > *:nth-child(4) { animation-delay: 0.8s; }

/* ============================================
   15. UTILITIES
   ============================================ */
.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;
}

/* ============================================
   16. RESPONSIVE BREAKPOINTS
   ============================================ */

/* Mobile First Improvements */
@media (max-width: 767px) {
    .nav {
        padding: var(--space-sm) var(--space-md);
    }
    
    .nav::before {
        left: 20px;
    }
    
    .nav__logo {
        margin-left: 10px;
    }
    
    .nav__logo-text {
        font-size: 0.95rem;
    }
    
    .hero__title {
        font-size: clamp(1.8rem, 8vw, 2.5rem);
    }
    
    .hero__subtitle {
        font-size: 1.15rem;
    }
    
    .section__title {
        font-size: clamp(1.5rem, 6vw, 2.25rem);
    }
    
    .cube-scene {
        width: 280px;
        height: 280px;
    }
    
    .cube-sketch {
        width: 280px;
        height: 280px;
    }
    
    .story__paragraph {
        font-size: 1.15rem;
    }
    
    .protocol-card__description {
        font-size: 1rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}

/* Tablet (768px+) */
@media (min-width: 768px) {
    .nav__menu {
        display: flex;
    }
    
    .nav__toggle {
        display: none;
    }
    
    .hero__grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .story__grid {
        grid-template-columns: 1fr 2fr;
    }
    
    .story__sidebar {
        display: block;
    }
    
    .protocols__grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .contact__grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .contact__visual {
        display: block;
        order: -1;
    }
    
    .form__row {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer__inner {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }
    
    .ink-trail {
        display: block;
    }
}

/* Desktop (1024px+) */
@media (min-width: 1024px) {
    .protocols__grid {
        grid-template-columns: repeat(3, 1fr);
    }
    
    .grid-canvas {
        display: flex;
    }
    
    .btn--full-mobile {
        width: auto;
    }
}

/* Large Desktop (1280px+) */
@media (min-width: 1280px) {
    .hero__content {
        max-width: 650px;
    }
    
    .hero__visual {
        min-height: 500px;
    }
}

/* Mobile Only */
@media (max-width: 767px) {
    .hero__visual {
        order: -1;
        min-height: 250px;
    }
    
    .scroll-indicator {
        display: none;
    }
    
    .btn--full-mobile {
        width: 100%;
        justify-content: center;
    }
    
    .section__title {
        font-size: var(--font-size-3xl);
    }
}

/* ============================================
   17. PRINT STYLES
   ============================================ */
@media print {
    *,
    *::before,
    *::after {
        background: transparent !important;
        color: #000 !important;
        box-shadow: none !important;
        text-shadow: none !important;
    }
    
    a,
    a:visited {
        text-decoration: underline;
    }
    
    a[href]::after {
        content: " (" attr(href) ")";
    }
    
    .nav,
    .hero__visual,
    .story__sidebar,
    .grid-canvas,
    .contact__visual,
    .loading-screen,
    .scroll-indicator,
    .ink-wash,
    .ink-trail,
    .ink-spill {
        display: none !important;
    }
    
    .section {
        page-break-inside: avoid;
    }
}

/* ============================================
   18. REDUCED MOTION
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
        scroll-behavior: auto !important;
    }
    
    .hero__content > * {
        opacity: 1;
        animation: none;
    }
    
    .story__paragraph {
        opacity: 1;
        transform: none;
    }
    
    .protocol-card {
        opacity: 1;
        transform: none;
    }
    
    .cube-glow,
    .scroll-indicator,
    .scroll-indicator__line {
        animation: none;
    }
}