/* ============================================
   ATLANTIS SERVICE — Custom Stylesheet
   Palette adaptée au logo : bleu-ardoise / teal
   Police unique : Open Sans
   ============================================ */

/* ----- Variables CSS ----- */
:root {
    --primary: #508296;
    --primary-dark: #285a6e;
    --primary-deeper: #0a3246;
    --primary-light: #eef6f9;
    --secondary: #eef6f9;
    --text: #334155;
    --text-light: #94a3b8;
    --white: #ffffff;
    --radius: 1rem;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.12);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 5rem;
}

body {
    overflow-x: hidden;
}

/* ----- Image Placeholder fallback ----- */
.img-placeholder {
    background: linear-gradient(135deg, #b0c4cc 0%, #7a9ba8 50%, #b0c4cc 100%);
    background-size: 200% 200%;
    animation: placeholder-shimmer 3s ease infinite;
    position: relative;
}

.img-placeholder::after {
    content: '';
    display: block;
}

@keyframes placeholder-shimmer {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ----- Sticky Header States ----- */
#site-header {
    transition: background-color 0.4s ease, box-shadow 0.4s ease, backdrop-filter 0.4s ease;
}

/* Transparent state (top of page) */
#site-header .nav-link {
    color: rgba(255, 255, 255, 0.9);
}
#site-header .nav-link:hover {
    color: var(--white);
}
#site-header .header-logo-text {
    color: var(--white);
}
#site-header .header-sub-text {
    color: rgba(255, 255, 255, 0.6);
}
#site-header .burger-icon span {
    background: var(--white);
}

/* Scrolled state */
#site-header.scrolled {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 20px rgba(0, 0, 0, 0.08);
}

#site-header.scrolled .nav-link {
    color: var(--text);
}
#site-header.scrolled .nav-link:hover {
    color: var(--primary);
}
#site-header.scrolled .header-logo-text {
    color: var(--primary-deeper);
}
#site-header.scrolled .header-sub-text {
    color: var(--primary);
}
#site-header.scrolled .burger-icon span {
    background: var(--text);
}

/* ----- Burger Icon ----- */
.burger-icon {
    width: 22px;
    height: 16px;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.burger-icon span {
    display: block;
    width: 100%;
    height: 2px;
    border-radius: 2px;
    transition: all 0.35s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    transform-origin: center;
}

/* Burger active (X shape) */
.burger-icon.active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.burger-icon.active span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.burger-icon.active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ----- Mobile Menu ----- */
.mobile-menu-closed {
    max-height: 0;
    opacity: 0;
    transition: max-height 0.4s ease, opacity 0.3s ease;
}

.mobile-menu-open {
    max-height: 500px;
    opacity: 1;
    transition: max-height 0.5s ease, opacity 0.3s ease 0.1s;
}

/* ----- Button Hover Effects ----- */
.btn-primary {
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.15), transparent);
    transition: left 0.6s ease;
    z-index: -1;
}

.btn-primary:hover::before {
    left: 100%;
}

/* ----- CTA Header button ----- */
.btn-cta-header {
    position: relative;
    overflow: hidden;
}
.btn-cta-header::after {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: inherit;
    background: linear-gradient(135deg, var(--primary), #6ba3b5, var(--primary));
    background-size: 200% 200%;
    animation: gradient-border 3s ease infinite;
    z-index: -1;
    opacity: 0;
    transition: opacity 0.3s ease;
}
.btn-cta-header:hover::after {
    opacity: 1;
}

@keyframes gradient-border {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

/* ----- Service Cards ----- */
.service-card {
    position: relative;
}

.service-card::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--primary);
    border-radius: 3px 3px 0 0;
    transition: width 0.4s ease;
}

.service-card:hover::before {
    width: 60%;
}

/* ----- Testimonial Cards ----- */
.testimonial-card {
    position: relative;
}

.testimonial-card::before {
    content: '\201C';
    position: absolute;
    top: 1rem;
    right: 1.5rem;
    font-size: 4rem;
    line-height: 1;
    font-family: 'Open Sans', sans-serif;
    font-weight: 800;
    color: rgba(255, 255, 255, 0.06);
    pointer-events: none;
}

/* ----- Animations ----- */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

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

.animate-fade-in {
    animation: fadeIn 0.8s ease forwards;
}

.animate-fade-in-up {
    opacity: 0;
    animation: fadeInUp 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* ----- Scroll Reveal (JS class) ----- */
.reveal {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity 0.7s ease, transform 0.7s ease;
}

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

/* ----- Form Focus Styles ----- */
input:focus,
textarea:focus {
    outline: none;
    box-shadow: 0 0 0 3px rgba(80, 130, 150, 0.2);
}

/* ----- Selection Color ----- */
::selection {
    background: var(--primary);
    color: var(--white);
}

/* ----- Reduced motion ----- */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    .animate-fade-in,
    .animate-fade-in-up,
    .reveal {
        animation: none !important;
        opacity: 1 !important;
        transform: none !important;
    }
}

/* ----- Hero Section Fix ----- */
#accueil {
    height: 100vh;
    height: 100dvh; /* Dynamic viewport height — fix pour mobile */
}

/* ----- Gallery Filters ----- */
.gallery-filter {
    background: transparent;
    border-color: #d1d5db;
    color: var(--text);
}
.gallery-filter:hover {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(80, 130, 150, 0.05);
}
.gallery-filter.active {
    background: var(--primary);
    border-color: var(--primary);
    color: var(--white);
}

/* Gallery item transitions */
.gallery-item {
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.gallery-item.hidden-item {
    opacity: 0;
    transform: scale(0.9);
    position: absolute;
    pointer-events: none;
    width: 0;
    height: 0;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

/* ----- Lightbox ----- */
#lightbox {
    transition: opacity 0.3s ease;
}
#lightbox.lightbox-visible {
    display: flex;
    opacity: 1;
}
#lightbox img {
    transition: opacity 0.3s ease;
}

/* ----- Scrollbar Styling ----- */
::-webkit-scrollbar {
    width: 8px;
}
::-webkit-scrollbar-track {
    background: #f1f5f9;
}
::-webkit-scrollbar-thumb {
    background: #b0c4cc;
    border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover {
    background: var(--primary);
}