@import url('https://fonts.googleapis.com/css2?family=Plus+Jakarta+Sans:wght@300;400;600;800&display=swap');

/* ═══════════════════════════════════════════════════
   VARIABLES & BASE
═══════════════════════════════════════════════════ */
:root {
    --bg-main: #f8fafc;
    --surface: #ffffff;
    --border: #e2e8f0;
    --text-primary: #0f172a;
    --text-secondary: #64748b;
    --blob-color: rgba(79, 70, 229, 0.1);
}

body.dark-theme {
    --bg-main: #0f172a;
    --surface: #1e293b;
    --border: #334155;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --blob-color: rgba(99, 102, 241, 0.15);
}

body {
    font-family: 'Plus Jakarta Sans', sans-serif;
    background-color: var(--bg-main);
    overflow: hidden;
    transition: background-color 0.3s ease;
}

/* ═══════════════════════════════════════════════════
   DARK MODE
═══════════════════════════════════════════════════ */
body.dark-theme .text-slate-900,
body.dark-theme .text-slate-800 { color: #f1f5f9 !important; }
body.dark-theme .text-slate-700 { color: #e2e8f0 !important; }
body.dark-theme .text-slate-500,
body.dark-theme .text-slate-600 { color: #94a3b8 !important; }
body.dark-theme .text-slate-400 { color: #64748b !important; }
body.dark-theme .bg-white\/80 { background-color: rgba(30, 41, 59, 0.8) !important; }
body.dark-theme .border-white,
body.dark-theme .border-slate-100 { border-color: #334155 !important; }
body.dark-theme .bg-indigo-50 { background-color: rgba(99, 102, 241, 0.1) !important; }
body.dark-theme .border-indigo-100 { border-color: rgba(99, 102, 241, 0.2) !important; }
body.dark-theme .social-btn { background-color: #1e293b !important; border-color: #334155 !important; }
body.dark-theme .social-btn:hover { background-color: #334155 !important; border-color: #4f46e5 !important; }
body.dark-theme #themeToggle { background-color: #334155; }

/* ═══════════════════════════════════════════════════
   COMPOSANTS
═══════════════════════════════════════════════════ */
.gradient-text {
    background: linear-gradient(135deg, #4f46e5 0%, #9333ea 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.social-btn {
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border);
    background: var(--surface);
}

.social-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 20px -5px rgba(79, 70, 229, 0.2);
    border-color: #4f46e5;
}

.bg-blob {
    position: absolute;
    width: 500px;
    height: 500px;
    background: linear-gradient(135deg, var(--blob-color) 0%, rgba(147, 51, 234, 0.1) 100%);
    filter: blur(80px);
    border-radius: 50%;
    z-index: -1;
    animation: float 20s infinite alternate;
    transition: background 0.3s ease;
}

@keyframes float {
    from { transform: translate(0, 0); }
    to { transform: translate(10%, 10%); }
}

#themeToggle { transition: all 0.3s ease; }

.delta-logo { width: 40px; height: 40px; flex-shrink: 0; }
.delta-logo svg { width: 100%; height: 100%; filter: drop-shadow(0 2px 8px rgba(99,102,241,0.35)); }