/* =========================================
   STUDIO KASHI - Main Design System
   Hand-crafted with intention and care
   ========================================= */

/* === CSS Custom Properties === */
:root {
    /* Primary Colors */
    --color-primary: #FF6B6B;
    --color-secondary: #4ECDC4;
    --color-accent: #FFE66D;
    --color-accent-2: #95E1D3;
    --color-accent-3: #F38181;
    
    /* Dark Tones */
    --color-dark: #0D0D0D;
    --color-dark-soft: #1A1A1A;
    --color-dark-medium: #2D2D2D;
    --color-dark-light: #3D3D3D;
    
    /* Light Tones */
    --color-light: #FAFAFA;
    --color-light-soft: #F0F0F0;
    --color-cream: #FFF8E7;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B6B 0%, #4ECDC4 100%);
    --gradient-secondary: linear-gradient(135deg, #667EEA 0%, #764BA2 100%);
    --gradient-warm: linear-gradient(135deg, #F093FB 0%, #F5576C 100%);
    --gradient-cool: linear-gradient(135deg, #11998E 0%, #38EF7D 100%);
    --gradient-dark: linear-gradient(180deg, #0D0D0D 0%, #1A1A1A 100%);
    --gradient-mesh: radial-gradient(at 40% 20%, #FF6B6B33 0px, transparent 50%),
                     radial-gradient(at 80% 0%, #4ECDC433 0px, transparent 50%),
                     radial-gradient(at 0% 50%, #667EEA33 0px, transparent 50%),
                     radial-gradient(at 80% 50%, #F093FB33 0px, transparent 50%),
                     radial-gradient(at 0% 100%, #11998E33 0px, transparent 50%);
    
    /* Typography */
    --font-display: 'Syne', sans-serif;
    --font-body: 'Space Grotesk', sans-serif;
    --font-accent: 'Instrument Serif', serif;
    
    /* Spacing (numeric scale) */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-7: 1.75rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    
    /* Spacing (named - for legacy) */
    --space-xs: 0.5rem;
    --space-sm: 0.875rem;
    --space-md: 1.5rem;
    --space-lg: 2.5rem;
    --space-xl: 4rem;
    --space-2xl: 6.5rem;
    --space-3xl: 10rem;
    
    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --ease-out-expo: cubic-bezier(0.19, 1, 0.22, 1);
    --ease-out-back: cubic-bezier(0.34, 1.56, 0.64, 1);
    --ease-in-out-circ: cubic-bezier(0.85, 0, 0.15, 1);
    --duration-fast: 0.2s;
    --duration-normal: 0.4s;
    --duration-slow: 0.8s;
    --duration-slower: 1.2s;
    
    /* Shadows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 48px rgba(0, 0, 0, 0.16);
    --shadow-glow: 0 0 40px rgba(255, 107, 107, 0.3);
    
    /* Z-indexes */
    --z-behind: -1;
    --z-base: 1;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal: 300;
    --z-cursor: 400;
    --z-loader: 500;
    
    /* Gray Scale */
    --color-gray-300: #D1D5DB;
    --color-gray-400: #9CA3AF;
    --color-gray-500: #6B7280;
    --color-gray-600: #4B5563;
    --color-white: #FFFFFF;
    
    /* Border */
    --color-border: rgba(255, 255, 255, 0.1);
    
    /* Transition Shorthands */
    --transition-fast: var(--duration-fast) var(--ease-out-expo);
    --transition-normal: var(--duration-normal) var(--ease-out-expo);
    --transition-slow: var(--duration-slow) var(--ease-out-expo);
    --ease-out: var(--ease-out-expo);
    
    /* Typography Sizes */
    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--color-light);
    background: var(--color-dark);
    overflow-x: hidden;
    cursor: none;
}

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

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-dark-soft);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
}

::selection {
    background: var(--color-primary);
    color: var(--color-dark);
}

/* === Typography === */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    line-height: 1.1;
    letter-spacing: -0.02em;
}

h1 {
    font-size: clamp(3rem, 10vw, 8rem);
}

h2 {
    font-size: clamp(2rem, 6vw, 4.5rem);
}

h3 {
    font-size: clamp(1.5rem, 3vw, 2rem);
}

.italic {
    font-family: var(--font-accent);
    font-style: italic;
    font-weight: 400;
}

.accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

a {
    color: inherit;
    text-decoration: none;
    transition: color var(--duration-fast) var(--ease-out-expo);
}

p {
    max-width: 65ch;
}

/* === Noise Overlay (texture) === */
.noise-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: var(--z-cursor);
    opacity: 0.03;
    background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 256 256' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noise'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noise)'/%3E%3C/svg%3E");
}

/* === Custom Cursor === */
.cursor {
    position: fixed;
    width: 8px;
    height: 8px;
    background: var(--color-light);
    border-radius: 50%;
    pointer-events: none;
    z-index: var(--z-cursor);
    mix-blend-mode: difference;
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s, background 0.3s;
}

.cursor-follower {
    position: fixed;
    width: 40px;
    height: 40px;
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    pointer-events: none;
    z-index: var(--z-cursor);
    transform: translate(-50%, -50%);
    transition: width 0.5s var(--ease-out-expo), height 0.5s var(--ease-out-expo), border-color 0.3s;
}

body:has(a:hover) .cursor,
body:has(button:hover) .cursor {
    width: 16px;
    height: 16px;
    background: var(--color-primary);
}

body:has(a:hover) .cursor-follower,
body:has(button:hover) .cursor-follower {
    width: 60px;
    height: 60px;
    border-color: var(--color-primary);
}

/* === Loader === */
.loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--color-dark);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: var(--z-loader);
    transition: opacity 0.6s var(--ease-out-expo), visibility 0.6s;
}

.loader.hidden {
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
}

.loader.loaded {
    opacity: 0;
    visibility: hidden;
}

.loader-inner {
    text-align: center;
}

.loader-text {
    font-family: var(--font-display);
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: 0.3em;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: block;
    margin-bottom: 1.5rem;
}

.loader-bar {
    width: 120px;
    height: 3px;
    background: var(--color-dark-medium);
    border-radius: var(--radius-full);
    overflow: hidden;
    margin: 0 auto;
}

.loader-bar::after {
    content: '';
    display: block;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    animation: loader-progress 1.5s var(--ease-in-out-circ) infinite;
    transform-origin: left;
}

@keyframes loader-progress {
    0% { transform: scaleX(0) translateX(0); }
    50% { transform: scaleX(1) translateX(0); }
    100% { transform: scaleX(0) translateX(120px); }
}

/* === Navigation === */
.nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--space-md) var(--space-lg);
    z-index: var(--z-sticky);
    transition: background 0.4s, padding 0.4s;
}

.nav.scrolled {
    background: rgba(13, 13, 13, 0.9);
    backdrop-filter: blur(20px);
    padding: var(--space-sm) var(--space-lg);
}

.nav-inner {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-text {
    font-family: var(--font-display);
    font-size: 1.25rem;
    font-weight: 800;
    letter-spacing: 0.2em;
}

.logo-dot {
    width: 8px;
    height: 8px;
    background: var(--gradient-primary);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); opacity: 1; }
    50% { transform: scale(1.2); opacity: 0.7; }
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: none;
    padding: 8px;
    z-index: 10;
}

.nav-toggle span {
    width: 28px;
    height: 2px;
    background: var(--color-light);
    border-radius: var(--radius-full);
    transition: transform 0.3s, opacity 0.3s;
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

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

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

.nav-link {
    position: relative;
    font-size: 0.875rem;
    font-weight: 500;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 0.5rem 0;
    overflow: hidden;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s var(--ease-out-expo);
}

.nav-link:hover::after,
.nav-link.active::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* === Buttons === */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
    font-family: var(--font-body);
    font-size: 0.875rem;
    font-weight: 600;
    letter-spacing: 0.05em;
    text-transform: uppercase;
    padding: 1rem 2rem;
    border-radius: var(--radius-full);
    border: none;
    cursor: none;
    transition: all var(--duration-normal) var(--ease-out-expo);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(-100%);
    transition: transform 0.4s var(--ease-out-expo);
}

.btn:hover::before {
    transform: translateX(0);
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--color-dark);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-glow);
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1rem;
}

.btn-gradient {
    background: var(--gradient-primary);
    color: var(--color-dark);
}

.btn-gradient:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(255, 107, 107, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--color-light);
    color: var(--color-light);
}

.btn-outline:hover {
    background: var(--color-light);
    color: var(--color-dark);
    transform: translateY(-2px);
}

.btn-dark {
    background: var(--color-dark);
    color: var(--color-light);
    border: 2px solid var(--color-dark-light);
}

.btn-dark:hover {
    background: var(--color-dark-medium);
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-white {
    background: var(--color-light);
    color: var(--color-dark);
}

.btn-white:hover {
    background: var(--color-cream);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.btn-outline-light {
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--color-light);
}

.btn-outline-light:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-light);
    transform: translateY(-2px);
}

.btn svg {
    transition: transform 0.3s var(--ease-out-expo);
}

.btn:hover svg {
    transform: translate(3px, -3px);
}

/* === Section Headers === */
.section-header {
    text-align: center;
    margin-bottom: var(--space-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    padding: 0 var(--space-md);
}

.section-header.light {
    color: var(--color-light);
}

.section-tag {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.tag-line {
    width: 30px;
    height: 2px;
    background: var(--gradient-primary);
}

.section-title {
    margin-bottom: var(--space-md);
}

.section-desc {
    font-size: 1.125rem;
    color: rgba(255, 255, 255, 0.7);
    max-width: 600px;
    margin: 0 auto;
}

/* === Footer === */
.footer {
    background: var(--color-dark-soft);
    padding: var(--space-3xl) var(--space-lg) var(--space-lg);
    position: relative;
    overflow: hidden;
}

.footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-primary), var(--color-secondary), transparent);
}

.footer-top {
    max-width: 1400px;
    margin: 0 auto var(--space-2xl);
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--space-2xl);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    margin-bottom: var(--space-md);
}

.footer-tagline {
    color: rgba(255, 255, 255, 0.6);
    font-size: 1rem;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
}

.footer-col h4 {
    font-family: var(--font-body);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.footer-col ul {
    list-style: none;
}

.footer-col li {
    margin-bottom: 0.75rem;
}

.footer-col a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9375rem;
    transition: color 0.3s, transform 0.3s;
    display: inline-block;
}

.footer-col a:hover {
    color: var(--color-light);
    transform: translateX(5px);
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: var(--space-lg);
    border-top: 1px solid var(--color-dark-medium);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.copyright {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal {
    display: flex;
    gap: var(--space-md);
}

.footer-legal a {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.5);
}

.footer-legal a:hover {
    color: var(--color-primary);
}

/* === Animations Classes === */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.slide-in-left.visible {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.slide-in-right.visible {
    opacity: 1;
    transform: translateX(0);
}

.scale-in {
    opacity: 0;
    transform: scale(0.9);
    transition: opacity 0.8s var(--ease-out-expo), transform 0.8s var(--ease-out-expo);
}

.scale-in.visible {
    opacity: 1;
    transform: scale(1);
}

/* Stagger delays */
[data-delay="1"] { transition-delay: 0.1s; }
[data-delay="2"] { transition-delay: 0.2s; }
[data-delay="3"] { transition-delay: 0.3s; }
[data-delay="4"] { transition-delay: 0.4s; }
[data-delay="5"] { transition-delay: 0.5s; }

/* === Responsive === */
@media (max-width: 1200px) {
    :root {
        --space-2xl: 5rem;
        --space-3xl: 7rem;
    }
}

@media (max-width: 992px) {
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        width: 100%;
        height: 100vh;
        background: var(--color-dark);
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transition: right 0.5s var(--ease-out-expo);
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-links {
        flex-direction: column;
        gap: var(--space-lg);
        margin-bottom: var(--space-xl);
    }
    
    .nav-link {
        font-size: 1.5rem;
    }
    
    .footer-top {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    :root {
        --space-lg: 2rem;
        --space-xl: 3rem;
        --space-2xl: 4rem;
        --space-3xl: 5rem;
    }
    
    .nav {
        padding: var(--space-sm) var(--space-md);
    }
    
    .btn-large {
        padding: 1rem 1.75rem;
        font-size: 0.875rem;
    }
    
    .footer-links {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-md);
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
}

@media (max-width: 480px) {
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-legal {
        flex-direction: column;
        gap: var(--space-sm);
    }
}

/* === Utility Classes === */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

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

.visually-hidden {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    border: 0;
}

/* Touch devices - disable custom cursor */
@media (hover: none) and (pointer: coarse) {
    .cursor,
    .cursor-follower {
        display: none;
    }
    
    body {
        cursor: auto;
    }
    
    a, button, .btn {
        cursor: pointer;
    }
}