/* ============================================
   TRAIT D'UNION STUDIO - Premium CSS
   « Quand l'élégance se conçoit, la performance se déploie. »
   ============================================ */

:root {
    /* Couleurs officielles - Charte Graphique TUS */
    --tus-black: #07080A;
    --tus-white: #F6F7FB;
    --tus-blue: #0B2DFF;
    --tus-green: #22C55E;
    --tus-green-light: #4ADE80;
    --surface-dark: #0D1016;
    --stroke-dark: rgba(246,247,251,0.10);
    --tus-gray: #6B7280;
    --tus-red: #DC2626;
}

/* ============================================
   Base
   ============================================ */
* {
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', system-ui, sans-serif;
    background-color: var(--tus-black);
    color: var(--tus-white);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Space Grotesk', system-ui, sans-serif;
    font-weight: 700;
    line-height: 1.2;
}

/* ============================================
   Links & Buttons
   ============================================ */
a {
    color: inherit;
    text-decoration: none;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: var(--tus-blue);
    color: var(--tus-white);
    padding: 0.875rem 2rem;
    border-radius: 9999px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 40px rgba(11, 45, 255, 0.4);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: transparent;
    color: var(--tus-white);
    padding: 0.875rem 2rem;
    border: 1px solid var(--stroke-dark);
    border-radius: 9999px;
    font-family: 'Space Grotesk', sans-serif;
    font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.btn-secondary:hover {
    border-color: var(--tus-blue);
    background-color: rgba(11, 45, 255, 0.1);
}

/* ============================================
   Cards Premium
   ============================================ */
.card-premium {
    background: linear-gradient(180deg, rgba(255,255,255,0.03), rgba(255,255,255,0.01));
    border: 1px solid var(--stroke-dark);
    border-radius: 18px;
    padding: 2rem;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.card-premium:hover {
    border-color: rgba(11, 45, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* ============================================
   Gradient Text
   ============================================ */
.gradient-text {
    background: linear-gradient(90deg, var(--tus-blue), #2D5BFF, var(--tus-white));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

/* ============================================
   Glass Effect
   ============================================ */
.glass {
    background: rgba(13, 16, 22, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
}

/* ============================================
   Form Inputs Premium
   ============================================ */
input, select, textarea {
    font-family: 'Inter', sans-serif;
}

input:focus, select:focus, textarea:focus {
    outline: none;
}

/* Custom select arrow */
select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23F6F7FB'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1.25rem;
    padding-right: 3rem;
}

/* ============================================
   Loading States
   ============================================ */
.htmx-request {
    opacity: 0.6;
    transition: opacity 0.3s ease;
}

/* ============================================
   FAQ Accordion (HTMX)
   ============================================ */
.faq-item .faq-content {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.faq-item.open .faq-content {
    max-height: 500px;
}

.faq-item .faq-icon {
    transition: transform 0.3s ease;
}

.faq-item.open .faq-icon {
    transform: rotate(180deg);
}

.faq-item.open {
    border-color: rgba(11, 45, 255, 0.3);
    background: rgba(255, 255, 255, 0.03);
}

.htmx-request::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    margin: -10px 0 0 -10px;
    border: 2px solid transparent;
    border-top-color: var(--tus-blue);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

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

::-webkit-scrollbar-track {
    background: var(--tus-black);
}

::-webkit-scrollbar-thumb {
    background: var(--stroke-dark);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(246,247,251,0.2);
}

/* ============================================
   Selection
   ============================================ */
::selection {
    background-color: var(--tus-blue);
    color: var(--tus-white);
}

/* ============================================
   Glow Effects
   ============================================ */
.glow-blue {
    box-shadow: 0 0 60px rgba(11, 45, 255, 0.3);
}

.glow-blue-hover:hover {
    box-shadow: 0 0 80px rgba(11, 45, 255, 0.5);
}

/* ============================================
   Apple-like Animations (Phase 2)
   ============================================ */

/* Fade Slide Up - entrée élégante */
@keyframes fadeSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-slide-up {
    animation: fadeSlideUp 0.6s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Scale apparition */
@keyframes fadeScaleIn {
    from {
        opacity: 0;
        transform: scale(0.9);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

.animate-scale-in {
    animation: fadeScaleIn 0.5s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

/* Pulse lent pour backgrounds */
@keyframes pulseSlow {
    0%, 100% {
        opacity: 0.15;
        transform: scale(1);
    }
    50% {
        opacity: 0.25;
        transform: scale(1.05);
    }
}

.animate-pulse-slow {
    animation: pulseSlow 4s ease-in-out infinite;
}

/* Gradient shift horizontal */
@keyframes gradientShiftX {
    0%, 100% {
        background-position: 0% 50%;
    }
    50% {
        background-position: 100% 50%;
    }
}

.animate-gradient-x {
    background-size: 200% 200%;
    animation: gradientShiftX 3s ease infinite;
}

/* Float effet flottant */
@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    25% {
        transform: translateY(-10px) rotate(1deg);
    }
    75% {
        transform: translateY(10px) rotate(-1deg);
    }
}

.animate-float {
    animation: float 6s ease-in-out infinite;
}

/* Stagger delay utilities */
.stagger-1 { animation-delay: 0.1s; }
.stagger-2 { animation-delay: 0.2s; }
.stagger-3 { animation-delay: 0.3s; }
.stagger-4 { animation-delay: 0.4s; }
.stagger-5 { animation-delay: 0.5s; }
.stagger-6 { animation-delay: 0.6s; }
.stagger-7 { animation-delay: 0.7s; }
.stagger-8 { animation-delay: 0.8s; }

/* Magnetic button effect base */
.btn-magnetic {
    transition: transform 0.2s cubic-bezier(0.33, 1, 0.68, 1);
    will-change: transform;
}

/* Card interactive premium */
.card-interactive {
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    will-change: transform, box-shadow;
}

.card-interactive:hover {
    transform: translateY(-8px);
    box-shadow: 
        0 25px 50px -12px rgba(0, 0, 0, 0.5),
        0 0 40px rgba(11, 45, 255, 0.15);
}

/* Link underline animation */
.link-animated {
    position: relative;
    display: inline-block;
}

.link-animated::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--tus-blue), #00D4FF);
    transition: width 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.link-animated:hover::after {
    width: 100%;
}

/* Shine effect on hover */
.shine-hover {
    position: relative;
    overflow: hidden;
}

.shine-hover::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: left 0.5s ease;
}

.shine-hover:hover::before {
    left: 100%;
}

/* ============================================
   APPLE-LIKE SCROLL REVEAL
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

.reveal-scale {
    opacity: 0;
    transform: scale(0.9);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-scale.active {
    opacity: 1;
    transform: scale(1);
}

.reveal-left {
    opacity: 0;
    transform: translateX(-60px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-left.active {
    opacity: 1;
    transform: translateX(0);
}

.reveal-right {
    opacity: 0;
    transform: translateX(60px);
    transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-right.active {
    opacity: 1;
    transform: translateX(0);
}

/* ============================================
   NAVBAR SCROLL EFFECTS
   ============================================ */
.navbar-scrolled {
    background-color: rgba(7, 8, 10, 0.95) !important;
    backdrop-filter: blur(30px) saturate(180%) !important;
    -webkit-backdrop-filter: blur(30px) saturate(180%) !important;
    border-color: rgba(246, 247, 251, 0.08) !important;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

/* ============================================
   CUSTOM CURSOR (Apple-like)
   ============================================ */
.cursor-dot {
    width: 8px;
    height: 8px;
    background: var(--tus-blue);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    transition: transform 0.1s ease;
    mix-blend-mode: difference;
}

.cursor-ring {
    width: 40px;
    height: 40px;
    border: 1px solid var(--tus-blue);
    border-radius: 50%;
    position: fixed;
    pointer-events: none;
    z-index: 9998;
    transition: all 0.15s ease-out;
    opacity: 0.5;
}

.cursor-ring.hover {
    transform: scale(1.5);
    background: rgba(11, 45, 255, 0.1);
    border-color: var(--tus-white);
}

/* Hide on touch devices */
@media (hover: none) {
    .cursor-dot, .cursor-ring {
        display: none !important;
    }
}

/* ============================================
   BENTO GRID (Apple Style)
   ============================================ */
.bento-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-auto-rows: minmax(200px, auto);
    gap: 1rem;
}

.bento-item {
    background: linear-gradient(180deg, rgba(255,255,255,0.05) 0%, rgba(255,255,255,0.02) 100%);
    border: 1px solid rgba(246, 247, 251, 0.08);
    border-radius: 24px;
    padding: 2rem;
    overflow: hidden;
    position: relative;
    transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

.bento-item::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at var(--mouse-x, 50%) var(--mouse-y, 50%), rgba(11, 45, 255, 0.15) 0%, transparent 50%);
    opacity: 0;
    transition: opacity 0.3s ease;
}

.bento-item:hover::before {
    opacity: 1;
}

.bento-item:hover {
    border-color: rgba(11, 45, 255, 0.3);
    transform: translateY(-4px);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5),
                0 0 60px rgba(11, 45, 255, 0.1);
}

.bento-large {
    grid-column: span 2;
    grid-row: span 2;
}

.bento-wide {
    grid-column: span 2;
}

.bento-tall {
    grid-row: span 2;
}

@media (max-width: 1024px) {
    .bento-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    .bento-large {
        grid-column: span 2;
        grid-row: span 1;
    }
}

@media (max-width: 640px) {
    .bento-grid {
        grid-template-columns: 1fr;
    }
    .bento-large, .bento-wide, .bento-tall {
        grid-column: span 1;
        grid-row: span 1;
    }
}

/* ============================================
   TEXT GRADIENT ANIMATION
   ============================================ */
.text-gradient-animated {
    background: linear-gradient(
        90deg,
        var(--tus-white) 0%,
        var(--tus-blue) 25%,
        #00D4FF 50%,
        var(--tus-blue) 75%,
        var(--tus-white) 100%
    );
    background-size: 200% auto;
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
    animation: textGradient 4s linear infinite;
}

@keyframes textGradient {
    0% { background-position: 0% center; }
    100% { background-position: 200% center; }
}

/* ============================================
   GLOW BUTTON PREMIUM
   ============================================ */
.btn-glow {
    position: relative;
    overflow: visible;
}

.btn-glow::before {
    content: '';
    position: absolute;
    inset: -2px;
    background: linear-gradient(90deg, var(--tus-blue), #00D4FF, var(--tus-blue));
    border-radius: inherit;
    z-index: -1;
    opacity: 0;
    filter: blur(15px);
    transition: opacity 0.3s ease;
}

.btn-glow:hover::before {
    opacity: 0.7;
}

/* ============================================
   3D CARD TILT
   ============================================ */
.card-3d {
    transform-style: preserve-3d;
    perspective: 1000px;
    transition: transform 0.3s ease;
}

.card-3d-inner {
    transition: transform 0.3s ease;
}

/* ============================================
   MARQUEE SCROLL
   ============================================ */
.marquee-container {
    overflow: hidden;
    white-space: nowrap;
}

.marquee-content {
    display: inline-block;
    animation: marqueeScroll 30s linear infinite;
}

@keyframes marqueeScroll {
    0% { transform: translateX(0); }
    100% { transform: translateX(-50%); }
}

/* ============================================
   BLOB ANIMATED BACKGROUND
   ============================================ */
.blob {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
    animation: blobMove 20s ease-in-out infinite;
}

@keyframes blobMove {
    0%, 100% {
        transform: translate(0, 0) scale(1);
    }
    25% {
        transform: translate(30px, -50px) scale(1.1);
    }
    50% {
        transform: translate(-20px, 20px) scale(0.9);
    }
    75% {
        transform: translate(50px, 50px) scale(1.05);
    }
}

/* ============================================
   NUMBER COUNTER ANIMATION
   ============================================ */
.counter {
    display: inline-block;
    font-variant-numeric: tabular-nums;
}

/* Respect user preferences */
@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;
    }
    
    .animate-pulse-slow,
    .animate-float,
    .animate-gradient-x,
    .reveal,
    .reveal-scale,
    .reveal-left,
    .reveal-right {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}