:root {
    --color-bg: #f8f9fa;
    --color-primary: #2563eb;
    --color-secondary: #1e293b;
    --color-accent: #f97316;
    --color-card: #fff;
    --color-border: #e5e7eb;
    --color-shadow: rgba(30,41,59,0.10);
    --color-shadow-hover: rgba(37,99,235,0.18);
    --color-menu: #1e293b;
    --color-menu-active: #2563eb;
    --color-menu-hover: #334155;
    --color-title: #0f172a;
    --color-desc: #64748b;
    --radius-card: 22px;
    --radius-btn: 12px;
    --gap: 32px;
    --transition-fast: .22s cubic-bezier(.8,.2,.2,1);
    --transition-slow: .35s cubic-bezier(.8,.2,.2,1);
    --glass-blur: blur(16px);
}

body {
    background: var(--color-bg);
    font-family: 'Inter', 'Segoe UI', Arial, sans-serif;
    color: var(--color-title);
    margin: 0;
    overflow-x: hidden;
    min-height: 100vh;
}
/* Barre latérale principale */
aside#menu {
    position: fixed;
    top: 0; left: 0;
    width: 72px;
    height: 100vh;
    background: var(--color-secondary);
    display: flex;
    flex-direction: column;
    align-items: center;
    padding-top: 20px;
    box-shadow: 2px 0 14px rgba(0,0,0,0.05);
    z-index: 1000;
}

/* Bouton hamburger */
#menuBtn {
    background: var(--color-primary);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 1.6em;
    padding: 14px;
    cursor: pointer;
    box-shadow: 0 4px 12px rgba(0,0,0,0.12);
    transition: all 0.2s ease;
}
#menuBtn:hover,
#menuBtn:focus {
    background: var(--color-accent);
    outline: none;
}

/* Panneau latéral secondaire */
#sideNav {
    position: fixed;
    top: 0;
    left: 72px;
    width: 240px;
    height: 100vh;
    background: var(--color-menu);
    transform: translateX(-260px);
    transition: transform 0.35s ease;
    display: flex;
    flex-direction: column;
    padding: 24px 0;
    box-shadow: 3px 0 12px rgba(0,0,0,0.08);
    z-index: 999;
}
#sideNav:not(.hidden) {
    transform: translateX(0);
}

/* En-tête du menu latéral */
.side-header {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 0 24px 20px;
    border-bottom: 1px solid var(--color-border);
}
.side-header .avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    object-fit: cover;
    border: 2px solid var(--color-primary);
}
.side-header .side-hello {
    display: block;
    font-size: 0.9em;
    color: #94a3b8;
}
.side-header .side-username {
    font-weight: 600;
    color: white;
}

/* Liste de liens */
#sideNav ul {
    list-style: none;
    padding: 0;
    margin: 20px 0;
}
#sideNav ul li {
    margin-bottom: 10px;
}
#sideNav ul li a {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 10px 24px;
    color: #cbd5e1;
    text-decoration: none;
    font-weight: 500;
    border-left: 3px solid transparent;
    transition: background 0.2s, border-color 0.2s, color 0.2s;
}
#sideNav ul li a:hover {
    background: var(--color-menu-hover);
    color: white;
    border-left-color: var(--color-primary);
}
#sideNav ul li a.active {
    background: var(--color-primary);
    color: white;
    border-left-color: var(--color-accent);
}

/* Pied du menu */
.side-footer {
    margin-top: auto;
    padding: 16px 24px;
    font-size: 0.8em;
    color: #94a3b8;
    border-top: 1px solid var(--color-border);
}


main {
    margin-left: 68px;
    padding: 44px 40px 40px 40px;
    min-height: 100vh;
    transition: margin-left var(--transition-fast);
    display: flex;
    flex-direction: column;
    background: url("https://www.transparenttextures.com/patterns/symphony.png");
    background-size: 200px 200px;
}

header h1 {
    font-size: 2.7em;
    font-weight: 800;
    color: var(--color-primary);
    letter-spacing: -.02em;
    margin-bottom: 18px;
    text-align: center;
}
.anim-title { display: block; animation: fadeInUp .7s;}
.anim-sub {
    display: block;
    font-weight: 500;
    color: var(--color-desc);
    font-size: 1.17em;
    margin-top: 8px;
    letter-spacing: .01em;
    animation: fadeInUp .8s .15s backwards;
}
.brand {
    color: var(--color-accent);
    text-shadow: 0 1px 13px #f6cba1;
    letter-spacing: .01em;
    font-family: inherit;
}

.welcome-card {
    background: var(--color-card);
    border-radius: var(--radius-card);
    box-shadow: 0 8px 44px var(--color-shadow), 0 1.5px 6px var(--color-shadow);
    display: flex;
    align-items: center;
    gap: 0;
    padding: 0;
    max-width: 950px;
    margin: 48px auto 0 auto;
    overflow: hidden;
    animation: fadeIn .8s;
}
@keyframes fadeIn {
    from { opacity: 0;}
    to { opacity: 1;}
}
.welcome-img {
    width: 400px;
    height: 100%;
    object-fit: cover;
    display: block;
}
.welcome-content {
    padding: 44px 38px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 18px;
    background: linear-gradient(133deg, #f8f9fa 85%, #f1f4fb 100%);
}
.welcome-content h2 {
    font-size: 2em;
    color: var(--color-secondary);
    font-weight: 800;
    margin-bottom: 12px;
    letter-spacing: -.01em;
    animation: fadeInUp .7s .18s backwards;
}
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px);}
    to { opacity: 1; transform: translateY(0);}
}
.welcome-content p {
    font-size: 1.17em;
    color: var(--color-desc);
    margin-bottom: 16px;
    animation: fadeInUp .7s .26s backwards;
}
.welcome-links {
    display: flex;
    gap: 20px;
    margin-top: 18px;
}
.welcome-btn, .welcome-btn-alt {
    background: var(--color-primary);
    color: #fff;
    border: none;
    border-radius: var(--radius-btn);
    padding: 14px 34px;
    font-size: 1.13em;
    font-weight: 700;
    box-shadow: 0 2px 10px var(--color-shadow);
    cursor: pointer;
    transition: background .19s, color .19s, box-shadow .18s, transform .13s;
    text-decoration: none;
    display: inline-block;
    align-items: center;
    border: none;
}
.welcome-btn i, .welcome-btn-alt i {
    margin-right: 9px;
}
.welcome-btn:hover,
.welcome-btn:focus {
    background: var(--color-accent);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 8px 22px var(--color-shadow-hover);
}
.welcome-btn-alt {
    background: var(--color-secondary);
    color: #fff;
    box-shadow: 0 2px 10px var(--color-shadow);
    border: none;
}
.welcome-btn-alt:hover,
.welcome-btn-alt:focus {
    background: var(--color-accent);
    color: #fff;
    transform: scale(1.05);
    box-shadow: 0 8px 22px var(--color-shadow-hover);
}

.welcome-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
    gap: 36px;
    max-width: 950px;
    margin: 52px auto 0 auto;
    animation: fadeIn .9s .25s backwards;
}
.feature-card {
    background: var(--color-card);
    border-radius: 19px;
    box-shadow: 0 2px 16px var(--color-shadow);
    padding: 38px 22px;
    display: flex;
    flex-direction: column;
    align-items: center;
    transition: box-shadow .19s, transform .13s;
    text-align: center;
    animation: fadeInUp .8s;
}
.feature-card i {
    font-size: 2.3em;
    color: var(--color-primary);
    margin-bottom: 16px;
    transition: color .16s;
}
.feature-card:hover, .feature-card:focus {
    box-shadow: 0 8px 32px var(--color-shadow-hover);
    transform: translateY(-4px) scale(1.04);
}
.feature-card:hover i { color: var(--color-accent); }
.feature-card h3 {
    font-size: 1.23em;
    font-weight: 800;
    margin-bottom: 8px;
    color: var(--color-primary);
}
.feature-card p {
    color: var(--color-desc);
    font-size: 1.07em;
}

.main-footer {
    margin-top: 48px;
    background: var(--color-menu);
    border-radius: 0 0 22px 22px;
    padding: 32px 0 12px 0;
    color: #fff;
    text-align: center;
    font-size: 1.08em;
    box-shadow: 0 -4px 24px rgba(30,41,59,0.10);
    display: flex;
    flex-direction: column;
    gap: 16px;
    align-items: center;
}
.footer-content {
    display: flex;
    flex-direction: column;
    gap: 5px;
}
.footer-content a {
    color: var(--color-accent);
    text-decoration: underline;
    margin-left: 8px;
    font-weight: 600;
}
.footer-content a:hover { color: var(--color-primary);}
.footer-social {
    display: flex;
    gap: 22px;
    font-size: 1.5em;
    justify-content: center;
}
.footer-social a {
    color: #fff;
    opacity:.8;
    transition: color .18s, opacity .16s, transform .13s;
}
.footer-social a:hover {
    color: var(--color-primary);
    opacity:1;
    transform: scale(1.1);
}
.copyright {
    color: #cbd5e1;
    font-size: .95em;
    margin-top: 10px;
}

@media (max-width: 950px) {
    .welcome-card { flex-direction: column; }
    .welcome-img { width: 100%; height: 220px; }
    .welcome-content { padding: 28px 8vw; }
    main { padding: 38px 6vw 18vw 6vw;}
}
@media (max-width: 700px) {
    main { margin-left: 0; padding: 18px 1vw 2vw 1vw;}
    aside#menu { width: 54px; }
    #sideNav { left: 54px; width: 160px;}
    header h1 { font-size: 2em;}
    .welcome-btn, .welcome-btn-alt { padding: 13px 18px; font-size: 1em;}
    .welcome-links { gap: 10px;}
    .main-footer { border-radius: 0 0 12px 12px; }
}
@media (max-width: 410px) {
    .welcome-content { padding: 18px 2vw;}
    .welcome-img { min-height: 80px; }
}

::-webkit-scrollbar { width: 10px; background: var(--color-bg);}
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 8px;}
::-webkit-scrollbar-thumb:hover { background: var(--color-primary); }

@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(24px);}
    to { opacity: 1; transform: translateY(0);}
}
@keyframes fadeIn {
    from { opacity: 0;}
    to { opacity: 1;}
}