/* ==========================================================================
   RESET & SYSTEM FOUNDATIONS
   ========================================================================== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Plus Jakarta Sans', sans-serif;
}

body {
    background-color: #0b0f19;
    color: #f8fafc;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    overflow: hidden;
    position: relative;
}

/* ==========================================================================
   AMBIENT LAYER DEPTH
   ========================================================================== */
.orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(130px);
    opacity: 0.14;
    z-index: 0;
    pointer-events: none;
}
.orb-1 {
    top: -15%;
    left: -10%;
    width: 450px;
    height: 450px;
    background: #4f46e5;
}
.orb-2 {
    bottom: -15%;
    right: -10%;
    width: 450px;
    height: 450px;
    background: #0ea5e9;
}

/* ==========================================================================
   THE FROSTED GLASS DESK CARD
   ========================================================================== */
#app-card {
    position: relative;
    z-index: 10;
    background: rgba(15, 23, 42, 0.45);
    backdrop-filter: blur(24px);
    -webkit-backdrop-filter: blur(24px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 24px;
    padding: 48px 40px;
    width: 90%;
    max-width: 440px;
    box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45), 
                inset 0 1px 0 rgba(255, 255, 255, 0.1);
    text-align: center;
}

h2 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -0.02em;
    margin-bottom: 10px;
    background: linear-gradient(to right, #ffffff, #e2e8f0);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

p {
    color: #64748b;
    font-size: 0.95rem;
    font-weight: 500;
    margin-bottom: 32px;
}

/* ==========================================================================
   LIVELY ORGANIC SELECTION BUTTONS
   ========================================================================== */
.btn-container {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-btn {
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.02), rgba(255, 255, 255, 0.005));
    border: 1px solid rgba(255, 255, 255, 0.06);
    color: #cbd5e1;
    padding: 16px 24px;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 14px;
    cursor: pointer;
    text-align: left;
    /* Springy easing physics for premium tactile responsiveness */
    transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    position: relative;
}

.option-btn:hover {
    color: #ffffff;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02));
    border-color: rgba(99, 102, 241, 0.35);
    transform: translateX(6px) scale(1.02);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
}

.option-btn:active {
    transform: translateX(3px) scale(1.0);
}

/* Subtle utility back action link */
.back-btn {
    background: transparent;
    border: none;
    color: #475569;
    font-weight: 600;
    margin-top: 24px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: color 0.2s ease;
}
.back-btn:hover {
    color: #94a3b8;
}

/* ==========================================================================
   THE TACTILE 3D SHINING START BUTTON
   ========================================================================== */
.btn-3d-wrapper {
    position: relative;
    background: #312e81; /* Deep dimensional underlying structural base shadow */
    border-radius: 16px;
    border: none;
    padding: 0;
    cursor: pointer;
    margin-top: 16px;
    display: inline-block;
    width: 100%;
}

.btn-3d-front {
    display: block;
    position: relative;
    padding: 18px 32px;
    border-radius: 16px;
    font-size: 1.15rem;
    font-weight: 800;
    letter-spacing: 0.04em;
    color: #ffffff;
    background: linear-gradient(135deg, #4f46e5, #3730a3);
    transform: translateY(-6px); /* Elevates surface layer off structural base shadow */
    transition: transform 150ms cubic-bezier(0.3, 0.7, 0.4, 1), background 0.3s;
    overflow: hidden;
    box-shadow: 0 10px 25px rgba(79, 70, 229, 0.25);
}

/* Hover Physics: Elevated compression height and soft depth illumination */
.btn-3d-wrapper:hover .btn-3d-front {
    transform: translateY(-8px);
    background: linear-gradient(135deg, #5a52e6, #4338ca);
    box-shadow: 0 16px 35px rgba(79, 70, 229, 0.4), 
                0 0 20px rgba(99, 102, 241, 0.25);
}

/* Pressed State: Physically bottoms flat onto the baseline structural anchor */
.btn-3d-wrapper:active .btn-3d-front {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.3);
}

/* Premium Non-Neon Linear Reflective Sheen */
.btn-3d-front::before {
    content: '';
    position: absolute;
    top: 0;
    left: -150%;
    width: 50%;
    height: 100%;
    background: linear-gradient(
        to right,
        rgba(255, 255, 255, 0) 0%,
        rgba(255, 255, 255, 0.25) 50%,
        rgba(255, 255, 255, 0) 100%
    );
    transform: skewX(-25deg);
}

.btn-3d-wrapper:hover .btn-3d-front::before {
    left: 150%;
    transition: left 0.85s cubic-bezier(0.4, 0, 0.2, 1);
}