@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700&display=swap');

:root {
    --primary: #4F46E5;
    --primary-glow: rgba(79, 70, 229, 0.4);
    --secondary: #E11D48;
    --secondary-glow: rgba(225, 29, 72, 0.4);
    --bg-base: #0B0F19;
    --bg-surface: rgba(20, 27, 45, 0.65);
    --bg-surface-hover: rgba(30, 41, 59, 0.85);
    --text-primary: #F8FAFC;
    --text-muted: #94A3B8;
    --success: #10B981;
    --danger: #EF4444;
    --glass-border: rgba(255, 255, 255, 0.08);
    --glass-border-highlight: rgba(255, 255, 255, 0.2);
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.25), 0 10px 10px -5px rgba(0, 0, 0, 0.1);
}

* { margin: 0; padding: 0; box-sizing: border-box; font-family: 'Outfit', sans-serif; }

body {
    background-color: var(--bg-base);
    color: var(--text-primary);
    min-height: 100vh;
    /* Advanced animated background */
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(79, 70, 229, 0.15), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(225, 29, 72, 0.15), transparent 25%);
    background-attachment: fixed;
    animation: bgPulse 15s ease-in-out infinite alternate;
}

@keyframes bgPulse {
    0% { background-position: 0% 0%; }
    100% { background-position: 100% 100%; }
}

/* Glassmorphism System */
.glass {
    background: var(--bg-surface);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1), border-color 0.3s ease;
}
.glass:hover {
    border-color: var(--glass-border-highlight);
}

/* Text & Gradients */
.text-gradient {
    background: linear-gradient(135deg, #818cf8, #f43f5e);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.text-glow { text-shadow: 0 0 20px var(--primary-glow); }

/* Forms */
.form-control {
    width: 100%;
    padding: 1rem 1.25rem;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: all 0.3s ease;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px var(--primary-glow);
    background: rgba(15, 23, 42, 0.9);
}

/* Advanced Buttons */
.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 1rem 2rem; border-radius: 16px; font-weight: 600; font-size: 1.1rem;
    cursor: pointer; border: none; gap: 0.75rem; position: relative; overflow: hidden;
    transition: all 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}
.btn::after {
    content: ''; position: absolute; top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(to right, transparent, rgba(255,255,255,0.2), transparent);
    transform: skewX(-25deg); transition: all 0.75s ease;
}
.btn:hover::after { left: 200%; }

.btn-primary {
    background: linear-gradient(135deg, var(--primary), #6366f1);
    color: white; box-shadow: 0 10px 25px var(--primary-glow);
}
.btn-primary:hover {
    transform: translateY(-3px) scale(1.02);
    box-shadow: 0 15px 35px var(--primary-glow);
}

/* Dialer / Grid */
.dialer-grid {
    display: grid; grid-template-columns: repeat(3, 1fr); gap: 1.25rem; margin: 2.5rem 0;
}
.dial-pad-btn {
    aspect-ratio: 1; border-radius: 50%;
    background: linear-gradient(145deg, rgba(255,255,255,0.05), rgba(0,0,0,0.1));
    border: 1px solid var(--glass-border); color: var(--text-primary);
    font-size: 1.75rem; font-weight: 500; display: flex; flex-direction: column;
    align-items: center; justify-content: center; cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    box-shadow: inset 0 2px 5px rgba(255,255,255,0.05), var(--shadow-sm);
}
.dial-pad-btn:hover {
    background: rgba(255,255,255,0.1); transform: scale(1.08) translateY(-2px);
    border-color: var(--glass-border-highlight);
    box-shadow: 0 10px 20px rgba(0,0,0,0.3);
}
.dial-pad-btn:active { transform: scale(0.95); }
.dial-sub { font-size: 0.7rem; color: var(--text-muted); font-weight: 400; letter-spacing: 1px; }

/* Call Actions */
.call-action-btn {
    width: 72px; height: 72px; border-radius: 50%; border: none; display: flex;
    align-items: center; justify-content: center; cursor: pointer; color: white;
    font-size: 1.75rem; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.call-btn-success {
    background: linear-gradient(135deg, #10B981, #059669);
    box-shadow: 0 10px 25px rgba(16, 185, 129, 0.4);
}
.call-btn-success:hover { transform: translateY(-4px); box-shadow: 0 15px 35px rgba(16, 185, 129, 0.6); }

.call-btn-danger {
    background: linear-gradient(135deg, #EF4444, #DC2626);
    box-shadow: 0 10px 25px rgba(239, 68, 68, 0.4);
}
.call-btn-danger:hover { transform: translateY(-4px); box-shadow: 0 15px 35px rgba(239, 68, 68, 0.6); }

/* Ringing Animation */
@keyframes pulseRingingAdvanced {
    0% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0.8), inset 0 0 0 0 rgba(255,255,255,0.5); }
    70% { box-shadow: 0 0 0 30px rgba(16, 185, 129, 0), inset 0 0 0 10px rgba(255,255,255,0); }
    100% { box-shadow: 0 0 0 0 rgba(16, 185, 129, 0), inset 0 0 0 0 rgba(255,255,255,0); }
}
.is-ringing { animation: pulseRingingAdvanced 1.5s infinite cubic-bezier(0.66, 0, 0, 1); }

/* Layout utilities */
.flex-center { display: flex; align-items: center; justify-content: center; }